### Install Example

Source: https://doc.qt.io/qt-6.5/qttestlib-tutorial4-example.html

Specifies the installation path for the QtTestLib tutorial 4 example.

```makefile
target.path = $$[QT_INSTALL_EXAMPLES]/qtestlib/tutorial4
INSTALLS += target
```

--------------------------------

### Basic QHttpServer Setup and Routing

Source: https://doc.qt.io/qt-6.5/qhttpserver.html

Demonstrates how to create a QHttpServer instance, define a route for the root path, and start the server. This is a fundamental example for getting started with QHttpServer.

```cpp
QHttpServer server;

server.route("/", [] () {
    return "hello world";
});
server.listen();
```

--------------------------------

### Configuring Example Install Path

Source: https://doc.qt.io/qt-6.5/22-qdoc-configuration-generalvariables.html

Sets the root path for project examples within the installed example directory. This path is used in conjunction with \"exampledirs\" and the \"example\" command to record correct paths in the example manifest file.

```qdoc
exampledirs = ./snippets \
              ../../../examples/mymodule

examplesinstallpath = mymodule
```

--------------------------------

### Specifying Example Install Path with \meta

Source: https://doc.qt.io/qt-6.5/12-0-qdoc-commands-miscellaneous.html

Use \meta {installpath} to specify the location of an installed example, overriding the configuration variable.

```cpp
/*!
    \example helloworld
    \title Hello World Example
    \meta {installpath} {tutorials}
*/
```

--------------------------------

### Project File Setup

Source: https://doc.qt.io/qt-6.5/qtquick3dphysics-material-material-pro.html

This snippet shows the qmake project file configuration for the Qt Quick 3D Physics material example. It includes necessary modules, installation paths, source files, resources, and other files.

```qmake
QT += quick quick3d

target.path = $$[QT_INSTALL_EXAMPLES]/quick3dphysics/material
INSTALLS += target

SOURCES += \
    main.cpp

RESOURCES += \
    qml.qrc

OTHER_FILES += \
    doc/src/*.*

```

--------------------------------

### Core Translation Setup

Source: https://doc.qt.io/qt-6.5/qtranslator.html

This example demonstrates how to load a translation file and install it into the Qt application. Ensure the translator is created before the application's widgets.

```cpp
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QTranslator translator;
    // look up e.g. :/i18n/myapp_de.qm
    if (translator.load(QLocale(), "myapp"_L1, "_"_L1, ":/i18n"_L1))
        QCoreApplication::installTranslator(&translator);

    QPushButton hello(QCoreApplication::translate("main", "Hello world!"));
    hello.resize(100, 30);

    hello.show();
    return app.exec();
}
```

--------------------------------

### Building the Notepad Example with Ninja

Source: https://doc.qt.io/qt-6.5/qtwidgets-tutorials-notepad-example.html

This example shows the specific commands to build the Notepad example application on Windows using Ninja as the build generator. Ensure your Qt installation path and example source path are correct.

```bash
md notepad-build
cd notepad-build
C:\Qt\6.5.12\msvc2019_64\bin\qt-cmake -GNinja C:\Examples\notepad
ninja
```

--------------------------------

### QUICK_TEST_MAIN_WITH_SETUP Example

Source: https://doc.qt.io/qt-6.5/qquicktest.html

Demonstrates setting up a Qt Quick Test application with a custom setup class. The Setup class provides slots for application and QML engine availability, as well as custom cleanup.

```cpp
#include <QtQuickTest>
#include <QQmlEngine>
#include <QQmlContext>
#include <QGuiApplication>

class Setup : public QObject
{
    Q_OBJECT

public:
    Setup() {}

public slots:
    void applicationAvailable()
    {
        // Initialization that only requires the QGuiApplication object to be available
    }

    void qmlEngineAvailable(QQmlEngine *engine)
    {
        // Initialization requiring the QQmlEngine to be constructed
        engine->rootContext()->setContextProperty("myContextProperty", QVariant(true));
    }

    void cleanupTestCase()
    {
        // Implement custom resource cleanup
    }
};

QUICK_TEST_MAIN_WITH_SETUP(mytest, Setup)

#include "src_qmltest_qquicktest.moc"
```

--------------------------------

### Configure Example URL with Path Placeholder

Source: https://doc.qt.io/qt-6.5/25-qdoc-configuration-derivedprojects.html

This configuration demonstrates using a placeholder `\1` in the `url.examples` variable to include dynamic path components in the generated example URLs. The `examplesinstallpath` variable specifies the installation path for examples.

```qdocconf
url.examples = "https://code.qt.io/cgit/qt/qtbase.git/tree/examples/\1?h=$QT_VER"
examplesinstallpath = corelib
```

--------------------------------

### Qt Quick 3D Project Setup

Source: https://doc.qt.io/qt-6.5/qtquick3d-intro-intro-pro.html

This snippet shows the essential qmake configuration for a Qt Quick 3D project. It includes adding the 'quick' and 'quick3d' modules, setting the installation path for examples, and specifying source and resource files.

```qmake
QT += quick quick3d

target.path = $$[QT_INSTALL_EXAMPLES]/quick3d/intro
INSTALLS += target

SOURCES += \
    main.cpp

RESOURCES += \
    qml.qrc

OTHER_FILES += \
    doc/src/*.*

```

--------------------------------

### Instancing Example Project Configuration

Source: https://doc.qt.io/qt-6.5/qtquick3d-instancing-instancing-pro.html

This .pro file configures the Qt Quick 3D Instanced Rendering Example. It specifies required Qt modules, installation paths, source files, and resources.

```qmake
QT += quick quick3d

target.path = $$[QT_INSTALL_EXAMPLES]/quick3d/instancing
INSTALLS += target

SOURCES += \
    main.cpp

RESOURCES += \
    qml.qrc

OTHER_FILES += \
    doc/src/*.*

```

--------------------------------

### Basic Image Capture Setup

Source: https://doc.qt.io/qt-6.5/qimagecapture.html

This snippet demonstrates the basic setup for using QImageCapture with a QCamera and QMediaCaptureSession. It shows how to initialize the objects, connect them, and start the camera.

```cpp
QMediaCaptureSession captureSession;
camera = new QCamera;
captureSession.setCamera(camera);

viewfinder = new QVideoWidget();
viewfinder->show();
captureSession.setVideoOutput(viewfinder);

imageCapture = new QImageCapture(camera);
captureSession.setImageCapture(imageCapture);

camera->start();
//on shutter button pressed
imageCapture->capture();
```

--------------------------------

### Basic View3D Setup with SceneEnvironment

Source: https://doc.qt.io/qt-6.5/qml-qtquick3d-sceneenvironment.html

A basic Qt Quick 3D View3D setup. This example demonstrates how to integrate a SceneEnvironment within a View3D item.

```qml
import QtQuick
import QtQuick3D
import QtQuick3D.Helpers

Item {
    width: 1280
    height: 720

    View3D {
        id: v3d
        anchors.fill: parent

        // SceneEnvironment properties would be set here
        // For example:
        // sceneEnvironment: SceneEnvironment {
        //     aoEnabled: true
        //     aoStrength: 75.0
        // }
    }
}
```

--------------------------------

### Qt Quick 3D Lights Example Project File

Source: https://doc.qt.io/qt-6.5/qtquick3d-lights-lights-pro.html

This is the main project file (.pro) for the Qt Quick 3D Lights Example. It specifies the necessary Qt modules, installation paths, source files, resources, and other files required for the example.

```qmake
QT += quick quick3d

target.path = $$[QT_INSTALL_EXAMPLES]/quick3d/lights

INSTALLS += target

SOURCES += \
    main.cpp

RESOURCES += \
    qml.qrc

OTHER_FILES += \
    doc/src/*.*

```

--------------------------------

### Particles 3D Testbed Example Project File

Source: https://doc.qt.io/qt-6.5/qtquick3d-particles3d-particles3d-pro.html

This is the project file (.pro) for the Qt Quick 3D Particles 3D Testbed example. It specifies the required Qt modules, installation path, source files, resources, and other files needed for the example.

```qmake
QT += quick quick3d

target.path = $$[QT_INSTALL_EXAMPLES]/quick3d/particles3d
INSTALLS += target

SOURCES +=\
    main.cpp

RESOURCES +=\
    qml.qrc

OTHER_FILES +=\
    doc/src/*.*
```

--------------------------------

### Project File Configuration

Source: https://doc.qt.io/qt-6.5/qtquick3d-lodhelper-lodhelper-pro.html

Configures the Qt project file (.pro) for the Level of Detail Helper Example. It includes necessary Qt modules and sets the installation path for the example.

```pro
QT += quick quick3d

target.path = $$[QT_INSTALL_EXAMPLES]/quick3d/lodhelper
INSTALLS += target

SOURCES +=		
        main.cpp

RESOURCES +=	
    qml.qrc

```

--------------------------------

### Main Function Setup

Source: https://doc.qt.io/qt-6.5/qtwidgets-painting-imagecomposition-example.html

Instantiates QApplication and ImageComposer, then shows the composer. This is the entry point for the application.

```cpp
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    ImageComposer composer;
    composer.show();
    return app.exec();
}
```

--------------------------------

### Start Line Edits Example Client

Source: https://doc.qt.io/qt-6.5/qtvirtualkeyboard-deployment-guide.html

Starts the Line Edits example application as a Wayland client.

```bash
./lineedits -platform wayland
```

--------------------------------

### Main Application Entry Point

Source: https://doc.qt.io/qt-6.5/remoteobjects-example-static-source.html

Sets up the QCoreApplication, instantiates the SimpleSwitch source, creates the QRemoteObjectHost, enables remoting, and starts the event loop.

```cpp
#include <QCoreApplication>
#include "simpleswitch.h"

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    SimpleSwitch srcSwitch; // create simple switch

    // Create host node without Registry:
    QRemoteObjectHost srcNode(QUrl(QStringLiteral("local:replica")));
    srcNode.enableRemoting(&srcSwitch); // enable remoting/sharing

    return a.exec();
}

```

--------------------------------

### Main Application Entry Point

Source: https://doc.qt.io/qt-6.5/qtquick3d-bakedlightmap-main-cpp.html

Sets up the Qt Quick 3D application, loads the QML file, and starts the event loop. Includes necessary headers and initializes the application.

```cpp
#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QtQuick3D/qquick3d.h>

int main(int argc, char *argv[])
{
    qputenv("QT_QUICK_CONTROLS_STYLE", "Basic");
    QGuiApplication app(argc, argv);
    QSurfaceFormat::setDefaultFormat(QQuick3D::idealSurfaceFormat());

    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
    if (engine.rootObjects().isEmpty())
        return -1;

    return app.exec();
}
```

--------------------------------

### Simple Fog Example Project File

Source: https://doc.qt.io/qt-6.5/qtquick3d-simplefog-simplefog-pro.html

This is the .pro file for the Qt Quick 3D Simple Fog Example. It specifies the required Qt modules, installation path, source files, resources, and other files.

```qmake
QT += quick quick3d

target.path = $$[QT_INSTALL_EXAMPLES]/quick3d/simplefog
INSTALLS += target

SOURCES +=
    main.cpp

RESOURCES +=
    qml.qrc

OTHER_FILES +=
    doc/src/*.*

```

--------------------------------

### C++ Application Setup

Source: https://doc.qt.io/qt-6.5/qtlocation-minimal-map-example.html

Sets up the QGuiApplication and QQmlApplicationEngine to load the main QML file. This is the standard entry point for Qt Quick applications.

```cpp
#include <QGuiApplication>
#include <QQmlApplicationEngine>
```

```cpp
int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);

    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));

    return app.exec();
}
```

--------------------------------

### Example Usage of qt_generate_deploy_app_script

Source: https://doc.qt.io/qt-6.5/qt-generate-deploy-app-script.html

Demonstrates how to use `qt_generate_deploy_app_script` within a CMake project to generate a deployment script and install it. This example sets up an executable, installs it, generates the deployment script, and then installs that script.

```cmake
cmake_minimum_required(VERSION 3.16...3.22)
project(MyThings)

find_package(Qt6 REQUIRED COMPONENTS Core)
qt_standard_project_setup()

qt_add_executable(MyApp main.cpp)

install(TARGETS MyApp
    BUNDLE  DESTINATION .
    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
)

qt_generate_deploy_app_script(
    TARGET MyApp
    OUTPUT_SCRIPT deploy_script
    NO_UNSUPPORTED_PLATFORM_ERROR
)
install(SCRIPT ${deploy_script})
```

--------------------------------

### Main Function Setup and Window Initialization

Source: https://doc.qt.io/qt-6.5/qtopengl-openglwindow-example.html

Initializes the QGuiApplication, configures surface format for antialiasing, creates and shows the TriangleWindow, and enables animation.

```cpp
int main(int argc, char **argv)
{
    QGuiApplication app(argc, argv);

    QSurfaceFormat format;
    format.setSamples(16);

    TriangleWindow window;
    window.setFormat(format);
    window.resize(640, 480);
    window.show();

    window.setAnimating(true);

    return app.exec();
}
```

--------------------------------

### Get and Set Start Address

Source: https://doc.qt.io/qt-6.5/qmodbusdataunit.html

Manage the starting address of the Modbus data unit. Use startAddress() to get the current address and setStartAddress() to modify it.

```c++
int startAddress() const
```

```c++
void setStartAddress(int _address_)
```

--------------------------------

### Direct Approach: Setting up UI in main.cpp

Source: https://doc.qt.io/qt-6.5/designer-using-a-ui-file.html

This C++ code demonstrates the direct approach to using a UI file. It includes the generated UI header, creates a QWidget, instantiates the UI object, and calls `setupUi` to populate the widget with the UI elements defined in the `.ui` file. This method is suitable for simple, self-contained components.

```cpp
#include "ui_calculatorform.h"

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    QWidget widget;
    Ui::CalculatorForm ui;
    ui.setupUi(&widget);

    widget.show();
    return app.exec();
}
```

--------------------------------

### Get Start Timestamp

Source: https://doc.qt.io/qt-6.5/qopcuahistoryreadrawrequest.html

Returns the start timestamp for the historical data range.

```cpp
QDateTime startTimestamp() const
```

--------------------------------

### Setup Data

Source: https://doc.qt.io/qt-6.5/qhelpenginecore.html

Initialize the help engine's data. Emits setupStarted() and setupFinished() signals.

```cpp
bool setupData()
```

--------------------------------

### Main Window and Viewport Setup

Source: https://doc.qt.io/qt-6.5/qtquick3d-lodhelper-main-qml.html

Sets up the main window, View3D, camera, and environment for the Qt Quick 3D scene. Includes camera animation for dynamic viewing.

```QML
import QtQuick
import QtQuick3D
import QtQuick3D.Helpers

Window {
    id: window
    width: 1280
    height: 720
    visible: true

    View3D {
        id: view
        anchors.fill: parent

        environment: SceneEnvironment {
            clearColor: "black"
            backgroundMode: SceneEnvironment.Color
            antialiasingMode: SceneEnvironment.MSAA
            antialiasingQuality: SceneEnvironment.High
        }

        PerspectiveCamera {
            id: camera
            position: Qt.vector3d(0, 10, 300)
            clipNear: 1.0
            NumberAnimation on z {
                from: 200
                to: -100
                duration: 40 * 1000
            }
        }

        DirectionalLight {
            eulerRotation.x: -30
            eulerRotation.y: -70
            ambientColor: Qt.rgba(0.5, 0.5, 0.5, 1.0)
        }

        RandomInstancing {
            id: randomInstancing
            instanceCount: 800

            position: InstanceRange {
                from: Qt.vector3d(-200, 0, -200)
                to: Qt.vector3d(200, 1, 200)
            }
            scale: InstanceRange {
                from: Qt.vector3d(10, 10, 10)
                to: Qt.vector3d(10, 10, 10)
            }
            rotation: InstanceRange {
                from: Qt.vector3d(0, 0, 0)
                to: Qt.vector3d(0, 0, 0)
            }
            color: InstanceRange {
                from: "grey"
                to: "white"
                proportional: true
            }

            randomSeed: 2021
        }

        PrincipledMaterial {
            id: marbleMaterial
            baseColorMap: Texture {
                source: "maps/baseColor.png"
                generateMipmaps: true
                mipFilter: Texture.Linear
            }
            opacityChannel: Material.A
            metalnessMap: Texture {
                source: "maps/occlusionRoughnessMetallic.png"
                generateMipmaps: true
                mipFilter: Texture.Linear
            }
            metalnessChannel: Material.B
            roughnessMap: Texture {
                source: "maps/occlusionRoughnessMetallic.png"
                generateMipmaps: true
                mipFilter: Texture.Linear
            }
            roughnessChannel: Material.G
            metalness: 1
            roughness: 1
            normalMap: Texture {
                source: "maps/normal.png"
                generateMipmaps: true
                mipFilter: Texture.Linear
            }
        }

        LodManager {
            camera: camera
            distances: [100, 140, 180]
            fadeDistance: 10

            Model {
                scale: Qt.vector3d(100, 100, 100);
                source: "meshes/marble_bust_01_LOD_0.mesh"
                materials: marbleMaterial
            }

            Model {
                scale: Qt.vector3d(100, 100, 100);
                source: "meshes/marble_bust_01_LOD_1.mesh"
                materials: marbleMaterial
            }

            Model {
                scale: Qt.vector3d(100, 100, 100);
                source: "meshes/marble_bust_01_LOD_2.mesh"
                materials: marbleMaterial
            }

            Model {
                scale: Qt.vector3d(100, 100, 100);
                source: "meshes/marble_bust_01_LOD_3.mesh"
                materials: marbleMaterial
            }
        }

        LodManager {
            camera: camera
            distances: [50, 100, 150]

            Model {
                instancing: randomInstancing
                source: "#Sphere"
                materials: [
                    PrincipledMaterial {
                        metalness: 0
                        roughness: 1
                        baseColor: "red"
                    }
                ]
                scale: Qt.vector3d(0.005, 0.005, 0.005)
            }

            Model {
                instancing: randomInstancing
                source: "#Cylinder"
                materials: [
                    PrincipledMaterial {
                        metalness: 0
                        roughness: 1
                        baseColor: "orange"
                    }
                ]
                scale: Qt.vector3d(0.005, 0.005, 0.005)
            }

            Model {
                instancing: randomInstancing
                source: "#Cube"
                materials: [
                    PrincipledMaterial {
                        metalness: 0
                        roughness: 1
                        baseColor: "yellow"
                    }
                ]
                scale: Qt.vector3d(0.005, 0.005, 0.005)
            }

            Model {
                instancing: randomInstancing
                source: "#Rectangle"
                materials: [

```

--------------------------------

### Get Y-coordinate of Start Point

Source: https://doc.qt.io/qt-6.5/qlinef.html

Retrieves the y-coordinate of the line's starting point.

```cpp
qreal y1 = line.y1();
```

--------------------------------

### Get X-coordinate of Start Point

Source: https://doc.qt.io/qt-6.5/qlinef.html

Retrieves the x-coordinate of the line's starting point.

```cpp
qreal x1 = line.x1();
```

--------------------------------

### Initialize ExampleShell

Source: https://doc.qt.io/qt-6.5/qtwaylandcompositor-custom-shell-example.html

Initializes the ExampleShell extension by registering it with the compositor and initializing the protocol extension itself.

```cpp
void ExampleShell::initialize()
{
    QWaylandCompositorExtensionTemplate::initialize();

    QWaylandCompositor *compositor = static_cast<QWaylandCompositor *>(extensionContainer());
    if (!compositor) {
        qWarning() << "Failed to find QWaylandCompositor when initializing ExampleShell";
        return;
    }

    init(compositor->display(), 1);
}
```

--------------------------------

### Get Start Point of QLineF

Source: https://doc.qt.io/qt-6.5/qlinef.html

Retrieves the starting point of the line as a QPointF object.

```cpp
QPointF startPoint = line.p1();
```

--------------------------------

### Basic Window Setup with Principled Material

Source: https://doc.qt.io/qt-6.5/qtquick3d-principledmaterial-main-qml.html

Sets up the main window, background image, and split view for the Qt Quick 3D application. It initializes the environment with lighting and antialiasing.

```qml

// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

import QtQuick
import QtQuick3D
import QtQuick3D.Effects
import QtQuick3D.Helpers
import QtQuick.Controls
import QtQuick.Layouts

Window {
    id: window
    width: 1280
    height: 720
    visible: true
    title: "Principled Materials Example"
    //color: "black"
    color: "#848895"

    Image {
        anchors.fill: parent
        source: "maps/grid.png"
        fillMode: Image.Tile
        horizontalAlignment: Image.AlignLeft
        verticalAlignment: Image.AlignTop
    }

    SplitView {
        id: splitView
        anchors.fill: parent
        Page {
            id: toolPage
            SplitView.fillHeight: true
            SplitView.preferredWidth: 420
            SplitView.minimumWidth: 300
            header: TabBar {
               id: tabBar
               TabButton {
                   text: "Basics"
               }
               TabButton {
                   text: "Alpha"
               }
               TabButton {
                   text: "Details"
               }
               TabButton {
                   text: "Clearcoat"
               }
               TabButton {
                   text: "Refraction"
               }
               TabButton {
                   text: "Special"
               }
            }

            StackLayout {
                id: toolPageSwipeView
                anchors.fill: parent
                anchors.margins: 10
                currentIndex: tabBar.currentIndex

                BasicsPane {
                    id: basicsPane
                    principledMaterial: basicMaterial
                    specularGlossyMaterial: specularGlossyMaterial
                }

                AlphaPane {
                    targetMaterial: viewport.specularGlossyMode ? specularGlossyMaterial : basicMaterial
                    specularGlossyMode: viewport.specularGlossyMode
                }

                DetailsPane {
                    targetMaterial: viewport.specularGlossyMode ? specularGlossyMaterial : basicMaterial
                    view3D: viewport
                }

                ClearcoatPane {
                    targetMaterial: viewport.specularGlossyMode ? specularGlossyMaterial : basicMaterial
                }

                RefractionPane {
                    targetMaterial: viewport.specularGlossyMode ? specularGlossyMaterial : basicMaterial
                    specularGlossyMode: viewport.specularGlossyMode
                }

                SpecialPane {
                    targetMaterial: viewport.specularGlossyMode ? specularGlossyMaterial : basicMaterial
                    linesModel: linesLogo
                    pointsModel: pointsLogo
                    specularGlossyMode: viewport.specularGlossyMode
                }
            }
        }

        View3D {
            id: viewport
            SplitView.fillHeight: true
            SplitView.fillWidth: true
            SplitView.minimumWidth: splitView.width * 0.5
            environment: SceneEnvironment {
                property bool enableEffects: false
                antialiasingMode: SceneEnvironment.MSAA
                antialiasingQuality: SceneEnvironment.High
                lightProbe: Texture {
                    source: "maps/OpenfootageNET_garage-1024.hdr"
                }
                effects: enableEffects ? [bloom, scurveTonemap] : []
                backgroundMode: SceneEnvironment.SkyBox

                SCurveTonemap {
                    id: scurveTonemap
                }
                HDRBloomTonemap {
                    id: bloom
                }
            }
            Node {
                id: originNode
                PerspectiveCamera {
                    id: cameraNode
                    z: 600
                    clipNear: 1
                    clipFar: 10000
                }
            }

            property bool specularGlossyMode: basicsPane.specularGlossyMode

            PrincipledMaterial {
                id: basicMaterial
                baseColor: "red"
            }

            SpecularGlossyMaterial {
                id: specularGlossyMaterial
                property alias baseColor: specularGlossyMaterial.albedoColor
                property real specularAmount: 1.0
                property real specularTint: 1.0

                specularColor: Qt.rgba(0.22, 0.22, 0.22, 1.0)
                albedoColor: "red"
            }

            Model {
                id: cube
                source: "#Cube"
                materials: viewport.specularGlossyMode ? specularGlossyMaterial : basicMaterial
                pickable: true
            }

            Model {
                id: sphereModel
                x: -200
                scale: Qt.vector3d(1.5, 1.5, 1.5)
                source: "#Sphere"

```

--------------------------------

### Get Start Page ID

Source: https://doc.qt.io/qt-6.5/qwizard.html

Returns the ID of the first page to be displayed when the wizard is started.

```cpp
int startId() const
```

--------------------------------

### Main Application Entry Point

Source: https://doc.qt.io/qt-6.5/qtscxml-sudoku-example.html

Sets up the QApplication, Sudoku state machine, and MainWindow. It starts the state machine, shows the main window, and enters the Qt event loop.

```cpp
#include "mainwindow.h"
#include "sudoku.h"

#include <QtWidgets/qapplication.h>

int main(int argc, char **argv)
{
    QApplication app(argc, argv);

    Sudoku machine;
    MainWindow mainWindow(&machine);

    machine.start();
    mainWindow.show();
    return app.exec();
}
```

--------------------------------

### Get QTimeLine Start Frame

Source: https://doc.qt.io/qt-6.5/qtimeline.html

Retrieve the starting frame of the timeline's frame range.

```cpp
int startFrame() const
```

--------------------------------

### Define Extra Commands for Install Set (Unix)

Source: https://doc.qt.io/qt-6.5/qmake-advanced-usage.html

Adds platform-specific commands to be executed before installation for a given install set. This example is specific to Unix.

```qmake
unix:documentation.extra = create_docs; mv master.doc toc.doc
```

--------------------------------

### Main Function Setup

Source: https://doc.qt.io/qt-6.5/qtwidgets-itemviews-spinboxdelegate-example.html

Initializes the Qt application, creates a standard item model, sets up a table view, and associates a custom SpinBoxDelegate with the table view.

```cpp
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QStandardItemModel model(4, 2);
    QTableView tableView;
    tableView.setModel(&model);

    SpinBoxDelegate delegate;
    tableView.setItemDelegate(&delegate);
```

--------------------------------

### Get AutoPlay Property

Source: https://doc.qt.io/qt-6.5/qspatialsound.html

Returns whether the sound should automatically start playing when a source gets specified.

```cpp
bool autoPlay() const
```

--------------------------------

### Get Elapsed Time in Microseconds

Source: https://doc.qt.io/qt-6.5/qaudiosource.html

Get the time elapsed since the audio source started, in microseconds.

```cpp
qint64 elapsedUSecs() const
```

--------------------------------

### Main Function Setup

Source: https://doc.qt.io/qt-6.5/qtwidgets-widgets-tablet-example.html

Initializes the TabletApplication, creates a TabletCanvas and MainWindow, and starts the application event loop.

```cpp
int main(int argv, char *args[])
{
    TabletApplication app(argv, args);
    TabletCanvas *canvas = new TabletCanvas;
    app.setCanvas(canvas);

    MainWindow mainWindow(canvas);
    mainWindow.resize(500, 500);
    mainWindow.show();
    return app.exec();
}
```

--------------------------------

### List Starting at a Specific Character

Source: https://doc.qt.io/qt-6.5/10-qdoc-commands-tablesandlists.html

Explains how to start a list at a specific character or number by providing it as an argument to the \list command. This example starts numbering at 'G'.

```qdoc
/*!
   \list G
       \li How to Learn Qt
       \li Installation
       \li Tutorial and Examples
   \endlist
*/
```

--------------------------------

### Query Specific Installation Path

Source: https://doc.qt.io/qt-6.5/qmake-environment-reference.html

Example of querying the installation prefix for the current qmake version using the QT_INSTALL_PREFIX property.

```bash
qmake -query "QT_INSTALL_PREFIX"
```

--------------------------------

### Main Application Entry Point

Source: https://doc.qt.io/qt-6.5/qtquick-scenegraph-openglunderqml-example.html

Sets up the Qt Quick application, configures OpenGL as the graphics API, and loads the main QML file.

```cpp
int main(int argc, char **argv)
{
    QGuiApplication app(argc, argv);

    QQuickWindow::setGraphicsApi(QSGRendererInterface::OpenGL);

    QQuickView view;
    view.setResizeMode(QQuickView::SizeRootObjectToView);
    view.setSource(QUrl("qrc:///scenegraph/openglunderqml/main.qml"));
    view.show();

    return QGuiApplication::exec();
}
```

--------------------------------

### Basic State Machine Setup

Source: https://doc.qt.io/qt-6.5/qml-qtqml-statemachine-state.html

This example demonstrates how to set up a basic StateMachine with an initial state in QML. It requires importing QtQuick and QtQml.StateMachine.

```qml
import QtQuick
import QtQml.StateMachine as DSM

Rectangle {
    DSM.StateMachine {
        id: stateMachine
        initialState: state
        running: true
        DSM.State {
            id: state
        }
    }
}
```

--------------------------------

### Get Start Bit

Source: https://doc.qt.io/qt-6.5/qcanuniqueiddescription.html

Returns the start bit position of the unique identifier within the data source. Bits are counted from the LSB.

```cpp
quint16 startBit() const
```

--------------------------------

### Basic Application Window Setup

Source: https://doc.qt.io/qt-6.5/qml-qtquick-application.html

This snippet demonstrates how to set up a basic QML Window, using Application properties for the title and connecting to the aboutToQuit signal.

```qml
import QtQuick

Window {
    id: root
    visible: true
    width: 800
    height: 680

    title: `${Application.name} (${Application.version})`

    Connections {
        target: Application
        function onAboutToQuit() {
            console.log("Bye!")
        }
    }
}
```

--------------------------------

### Specify Framework Headers for Installation

Source: https://doc.qt.io/qt-6.5/qmake-platform-notes.html

Use QMAKE_BUNDLE_DATA to specify header files to be installed with a library bundle. This example defines headers for a framework.

```qmake
FRAMEWORK_HEADERS.version = Versions
FRAMEWORK_HEADERS.files = path/to/header_one.h path/to/header_two.h
FRAMEWORK_HEADERS.path = Headers
QMAKE_BUNDLE_DATA += FRAMEWORK_HEADERS
```

--------------------------------

### Basic Window Setup with View3D

Source: https://doc.qt.io/qt-6.5/qtquick3d-custommaterial-main-qml.html

Sets up the main window and the View3D component for rendering. Includes camera, environment, and lighting configurations.

```qml
// Copyright (C) 2020 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

import QtQuick
import QtQuick3D
import QtQuick.Controls
import QtQuick.Layouts

Window {
    id: window
    width: 1280
    height: 720
    visible: true
    title: "Custom Materials Example"

    View3D {
        id: v3d
        anchors.fill: parent

        camera: camera

        environment: SceneEnvironment {
            backgroundMode: SceneEnvironment.SkyBox
            probeExposure: 2
            lightProbe: Texture {
                source: "maps/OpenfootageNET_lowerAustria01-1024.hdr"
            }
        }

        PerspectiveCamera {
            id: camera
            fieldOfView: 45
            position: Qt.vector3d(0, 100, 900)
        }

        SpotLight {
            position: Qt.vector3d(0, 500, 0)
            eulerRotation.x: -60
            color: Qt.rgba(1.0, 1.0, 0.1, 1.0)
            brightness: 50
            castsShadow: true
            shadowMapQuality: Light.ShadowMapQualityHigh
        }

        property real globalRotation: 0
        NumberAnimation on globalRotation {
            from: 0
            to: 360
            duration: 27000
            loops: Animation.Infinite
        }

        property real radius: 400
        property real separation: 360/5

        Model {
            id: floor
            source: "#Rectangle"
            y: -200
            scale: Qt.vector3d(15, 15, 1)
            eulerRotation.x: -90
            materials: [
                DefaultMaterial {
                    diffuseColor: "white"
                }
            ]
        }

        // Start with a simple material, using the built-in implementation for everything.
        Node {
            eulerRotation.y: v3d.globalRotation
            Model {
                source: "weirdShape.mesh"
                scale: Qt.vector3d(100, 100, 100)
                rotation: Quaternion.fromEulerAngles(-90, 0, 0)
                x: v3d.radius

                materials: [
                    CustomMaterial {
                        shadingMode: CustomMaterial.Shaded
                        fragmentShader: "material_simple.frag"
                        property color uDiffuse: "fuchsia"
                        property real uSpecular: 1.0
                    }
                ]
            }
        }

        // A metallic material using defaults for everything, except ambient light, and no uniforms.
        Node {
            eulerRotation.y: v3d.globalRotation + v3d.separation * 1
            Model {
                source: "weirdShape.mesh"
                scale: Qt.vector3d(100, 100, 100)
                rotation: Quaternion.fromEulerAngles(-90, 0, 0)
                x: v3d.radius

                materials: [
                    CustomMaterial {
                        shadingMode: CustomMaterial.Shaded
                        fragmentShader: "material_metallic.frag"
                    }
                ]
            }
        }

        // A material with custom handling of all the lights, but still using
        // the built-in specular function.
        Node {
            eulerRotation.y: v3d.globalRotation + v3d.separation * 2
            Model {
                source: "weirdShape.mesh"
                scale: Qt.vector3d(100, 100, 100)
                rotation: Quaternion.fromEulerAngles(-90, 0, 0)
                x: v3d.radius
                materials: [
                    CustomMaterial {
                        shadingMode: CustomMaterial.Shaded
                        fragmentShader: "material_customlights.frag"
                        property color uDiffuse: "orange"
                        property real uShininess: 150
                    }
                ]
            }
        }

        // Custom handling of everything, including specular.
        Node {
            eulerRotation.y: v3d.globalRotation  + v3d.separation * 3
            Model {
                source: "weirdShape.mesh"
                scale: Qt.vector3d(100, 100, 100)
                rotation: Quaternion.fromEulerAngles(-90, 0, 0)
                x: v3d.radius
                materials: [
                    CustomMaterial {
                        shadingMode: CustomMaterial.Shaded
                        fragmentShader: "material_customspecular.frag"
                        property color uDiffuse: "green"
                        property real uShininess: 150
                    }
                ]
            }
        }

        // Custom lights, plus custom vertex shader
        Node {
            eulerRotation.y: v3d.globalRotation + v3d.separation * 4
            Model {
                source: "weirdShape.mesh"
                scale: Qt.vector3d(100, 100, 100)
                rotation: Quaternion.fromEulerAngles(-90, 0, 0)
                x: v3d.radius
                materials: [
                    CustomMaterial {

```

--------------------------------

### Get Substring by Start and Length

Source: https://doc.qt.io/qt-6.5/qlatin1stringview.html

Returns a substring of a specified length starting at a given position. If the start position exceeds the string length, an empty view is returned. If fewer characters are available than requested, all available characters from the start position are returned.

```cpp
QLatin1StringView QLatin1StringView::mid(qsizetype _start_ , qsizetype _length_ = -1) const
```

--------------------------------

### Example Main Application File (main.cpp)

Source: https://doc.qt.io/qt-6.5/qmake-precompiledheaders.html

The main entry point for the application. It initializes QApplication, creates instances of MyObject and MyDialog, connects a signal to a slot, and shows the dialog.

```cpp
#include <QApplication>
#include <QPushButton>
#include <QLabel>
#include "myobject.h"
#include "mydialog.h"

int main(int argc, char **argv)
{
    QApplication app(argc, argv);

    MyObject obj;
    MyDialog dialog;

    dialog.connect(dialog.aButton, SIGNAL(clicked()), SLOT(close()));
    dialog.show();

    return app.exec();
}

```

--------------------------------

### Starting Animation on Ready Status

Source: https://doc.qt.io/qt-6.5/qml-qt-labs-lottieqt-lottieanimation.html

This example shows how to automatically start a Lottie animation once it has been successfully loaded. It uses the `onStatusChanged` signal handler to check if the animation `status` is `Ready` before calling the `start()` function.

```qml
LottieAnimation {
    source: "animation.json"
    autoPlay: false
    onStatusChanged: {
        if (status === LottieAnimation.Ready)
            start();
    }
}
```

--------------------------------

### Complete Example .pro File for Third-Party Library Integration

Source: https://doc.qt.io/qt-6.5/third-party-libraries.html

This is a complete .pro file demonstrating how to set the target name, template, include paths, source files, and library linking for a third-party library.

```qmake
TARGET = MyQtApp

TEMPLATE = app

INCLUDEPATH += 3rdparty/CatWhisperer/include

SOURCES += src/main.cpp

LIBS += -L"3rdparty/CatWhisperer/lib" -lCatWhisperer
```

--------------------------------

### Start Dockerized CoAP Test Server

Source: https://doc.qt.io/qt-6.5/qtcoap-simplecoapclient-example.html

Pulls and starts a Docker container for the Californium CoAP test server. Ensure Docker is installed and running.

```bash
docker run --name coap-test-server -d --rm -p 5683:5683/udp -p 5684:5684/udp tqtc/coap-californium-test-server:3.8.0
```

--------------------------------

### Configure Qt to Build Examples and Tests

Source: https://doc.qt.io/qt-6.5/configure-options.html

Shows how to use the -make option with configure to include examples and tests in the build process.

```bash
~/qt-source/configure -make examples -make tests
```

--------------------------------

### Get Start of Day (Local Time)

Source: https://doc.qt.io/qt-6.5/qdate.html

Returns the start moment of the day using the system's local time. This is an overloaded function for convenience.

```cpp
QDateTime QDate::startOfDay() const
```

--------------------------------

### Build Configuration for Mass Example

Source: https://doc.qt.io/qt-6.5/qtquick3dphysics-mass-mass-pro.html

Configures the Qt build system for the mass example, specifying modules, installation paths, source files, and resources.

```qmake
QT += quick quick3d

target.path = $$[QT_INSTALL_EXAMPLES]/quick3dphysics/mass
INSTALLS += target

SOURCES += \
    main.cpp

RESOURCES += \
    qml.qrc

OTHER_FILES += \
    doc/src/*.*
```

--------------------------------

### Impeller Example CMakeLists.txt

Source: https://doc.qt.io/qt-6.5/qtquick3dphysics-impeller-cmakelists-txt.html

Configures the build for the Impeller example, including project settings, dependencies on Qt modules, resource compilation, and installation rules.

```cmake
# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: BSD-3-Clause

cmake_minimum_required(VERSION 3.14)
project(example_impeller LANGUAGES CXX)

set(CMAKE_AUTOMOC ON)

if(NOT DEFINED INSTALL_EXAMPLESDIR)
    set(INSTALL_EXAMPLESDIR "examples")
endif()

set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/quick3dphysics/${PROJECT_NAME}")

find_package(Qt6 REQUIRED COMPONENTS Core Gui Quick Quick3D Quick3DPhysics)

qt_add_executable(${PROJECT_NAME}
    main.cpp
)

set_target_properties(${PROJECT_NAME} PROPERTIES
    WIN32_EXECUTABLE TRUE
    MACOSX_BUNDLE TRUE
)

target_link_libraries(${PROJECT_NAME} PUBLIC
    Qt::Core
    Qt::Gui
    Qt::Quick
    Qt::Quick3D
    Qt::Quick3DPhysics
)

# Resources:
set(qml_resource_files
    "main.qml"
)

qt_add_resources(${PROJECT_NAME} "qml"
    PREFIX
        "/"
    FILES
        ${qml_resource_files}
)

install(TARGETS ${PROJECT_NAME}
    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
)
```

--------------------------------

### Initialize QHelpEngineCore

Source: https://doc.qt.io/qt-6.5/qhelpenginecore.html

Initialize the help engine with a collection file and an optional parent object.

```cpp
QHelpEngineCore(const QString &_collectionFile_ , QObject *_parent_ = nullptr)
```

--------------------------------

### Example: Check for Drag Start

Source: https://doc.qt.io/qt-6.5/qapplication.html

This example demonstrates how to use QApplication::startDragDistance() to determine if a drag and drop operation should be initiated based on the mouse movement.

```cpp
if ((startPos - currentPos).manhattanLength() >= 
        QApplication::startDragDistance())
    startTheDrag();

```

--------------------------------

### Main Application Entry Point

Source: https://doc.qt.io/qt-6.5/activeqt-activeqt-qutlook-example.html

Sets up the Qt application, instantiates the AddressView, and starts the event loop. This is the main entry point for the Qutlook example.

```cpp
#include "addressview.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    AddressView view;
    view.setWindowTitle(QObject::tr("Qt Example - Looking at Outlook"));
    view.show();

    return a.exec();
}
```

--------------------------------

### Initialize Qt 3D Window and Scene

Source: https://doc.qt.io/qt-6.5/qt3d-simple-cpp-example.html

Set up the main application window, camera, and camera controller, then display the scene.

```cpp
int main(int argc, char* argv[])
{
    QGuiApplication app(argc, argv);
    Qt3DExtras::Qt3DWindow view;

    Qt3DCore::QEntity *scene = createScene();

    // Camera
    Qt3DRender::QCamera *camera = view.camera();
    camera->lens()->setPerspectiveProjection(45.0f, 16.0f/9.0f, 0.1f, 1000.0f);
    camera->setPosition(QVector3D(0, 0, 40.0f));
    camera->setViewCenter(QVector3D(0, 0, 0));

    // For camera controls
    Qt3DExtras::QOrbitCameraController *camController = new Qt3DExtras::QOrbitCameraController(scene);
    camController->setLinearSpeed( 50.0f );
    camController->setLookSpeed( 180.0f );
    camController->setCamera(camera);

    view.setRootEntity(scene);
    view.show();

    return app.exec();
}
```

--------------------------------

### Basic HTTP Server Setup

Source: https://doc.qt.io/qt-6.5/qthttpserver-simple-main-cpp.html

Sets up a basic HTTP server with a root route that returns 'Hello world'. This is a starting point for any HTTP server application.

```cpp
#include <QCoreApplication>
#include <QHttpServer>

int main(int argc, char *argv[])
{
    QCoreApplication app(argc, argv);

    QHttpServer httpServer;
    httpServer.route("", []() {
        return "Hello world";
    });

    const auto port = httpServer.listen(QHostAddress::Any);
    if (!port) {
        qWarning() << QCoreApplication::translate("QHttpServerExample",
                                                  "Server failed to listen on a port.");
        return -1;
    }

    qInfo().noquote()
        << QCoreApplication::translate("QHttpServerExample",
                                       "Running on http://127.0.0.1:%1/ (Press CTRL+C to quit)")
           .arg(port);

    return app.exec();
}
```

--------------------------------

### Impeller Example Scene Setup

Source: https://doc.qt.io/qt-6.5/qtquick3dphysics-impeller-main-qml.html

Sets up the main scene for the impeller example, including the physics world, camera, lighting, and various rigid bodies.

```qml
// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
import QtQuick
import QtQuick3D
import QtQuick3D.Physics

Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("Qt Quick 3D Physics - Impeller")

    PhysicsWorld {
        gravity: Qt.vector3d(0, -490, 0)
        scene: viewport.scene
    }

    View3D {
        id: viewport
        anchors.fill: parent

        environment: SceneEnvironment {
            clearColor: "#d6dbdf"
            backgroundMode: SceneEnvironment.Color
        }

        PerspectiveCamera {
            position: Qt.vector3d(0, 200, 1000)
            clipFar: 2000
            clipNear: 1
        }

        DirectionalLight {
            eulerRotation.x: -45
            eulerRotation.y: 45
            castsShadow: true
            brightness: 1
            shadowFactor: 100
        }

        StaticRigidBody {
            position: Qt.vector3d(0, -100, 0)
            eulerRotation: Qt.vector3d(-90, 0, 0)
            collisionShapes: PlaneShape {}
            Model {
                source: "#Rectangle"
                scale: Qt.vector3d(500, 500, 1)
                materials: PrincipledMaterial {
                    baseColor: "green"
                }
                castsShadows: false
                receivesShadows: true
            }
        }

        DynamicRigidBody {
            id: sphere
            massMode: DynamicRigidBody.CustomDensity
            density: 0.00001
            position: Qt.vector3d(0, 600, 0)
            property bool inArea: false
            sendContactReports: true
            receiveTriggerReports: true

            onEnteredTriggerBody: {
                inArea = true
            }
            onExitedTriggerBody: {
                inArea = false
            }

            collisionShapes: SphereShape {}
            Model {
                source: "#Sphere"
                materials: PrincipledMaterial {
                    baseColor: sphere.inArea ? "yellow" : "red"
                }
            }
        }

        TriggerBody {
            position: Qt.vector3d(0, 350, 0)
            scale: Qt.vector3d(1, 2, 1)

            collisionShapes: BoxShape {
                id: boxShape
            }
            Model {
                source: "#Cube"
                materials: PrincipledMaterial {
                    baseColor: Qt.rgba(1, 0, 1, 0.2)
                    alphaMode: PrincipledMaterial.Blend
                }
            }
        }

        StaticRigidBody {
            position: Qt.vector3d(0, 0, 0)
            scale: Qt.vector3d(2, 2, 2)
            receiveContactReports: true

            collisionShapes: SphereShape {}

            Model {
                source: "#Sphere"
                materials: PrincipledMaterial {
                    baseColor: "blue"
                }
            }

            onBodyContact: (body, positions, impulses, normals) => {
                for (var normal of normals) {
                    let velocity = normal.times(-700)
                    body.setLinearVelocity(velocity)
                }
            }
        }
    }
}
```

--------------------------------

### Basic SpotLight Example

Source: https://doc.qt.io/qt-6.5/qml-qtquick3d-spotlight.html

A simple scene setup with a SpotLight positioned and configured for basic illumination. This example demonstrates the default behavior and basic properties.

```qml
import QtQuick
import QtQuick3D
View3D {
    anchors.fill: parent

    PerspectiveCamera { z: 600 }

    SpotLight {
        z: 300
        brightness: 10
        ambientColor: Qt.rgba(0.1, 0.1, 0.1, 1.0)
    }

    Model {
        source: "#Rectangle"
        scale: Qt.vector3d(10, 10, 10)
        z: -100
        materials: PrincipledMaterial { }
    }

    Model {
        source: "#Sphere"
        scale: Qt.vector3d(2, 2, 2)
        materials: PrincipledMaterial {
            baseColor: "#40c060"
            roughness: 0.1
        }
    }
}
```