### MQL Hello World Server Example

Source: https://github.com/dingmaotu/mql-zmq/blob/master/README.md

A basic ZeroMQ REP (Reply) socket server implemented in MQL4. It binds to a TCP port, waits for a 'Hello' message, and replies with 'World'. Note that the recv operation blocks the script thread.

```MQL4
#include <Zmq/Zmq.mqh>
//+------------------------------------------------------------------+
//| Hello World server in MQL                                        |
//| Binds REP socket to tcp://*:5555                                 |
//| Expects "Hello" from client, replies with "World"                |
//+------------------------------------------------------------------+
void OnStart()
  {
   Context context("helloworld");
   Socket socket(context,ZMQ_REP);

   socket.bind("tcp://*:5555");

   while(true)
     {
      ZmqMsg request;

      // Wait for next request from client

      // MetaTrader note: this will block the script thread
      // and if you try to terminate this script, MetaTrader
      // will hang (and crash if you force closing it)
      socket.recv(request);
      Print("Receive Hello");

      Sleep(1000);

      ZmqMsg reply("World");
      // Send reply back to client
      socket.send(reply);
     }
  }
```

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

### MQL/C++: Load ZeroMQ and libsodium DLLs

Source: https://github.com/dingmaotu/mql-zmq/blob/master/README.md

This snippet demonstrates how to load the precompiled ZeroMQ and libsodium DLLs for MetaTrader 4/5. It specifies the library paths for both 32-bit and 64-bit versions and includes a note about the Visual C++ runtime dependency. It also mentions a workaround for 32-bit MT5 regarding the `__X64__` macro.

```MQL4
#property strict

// Include ZMQ headers
#include <Zmq\Zmq.mqh>

// --- DLL Loading ---
// For MT5 64-bit, use Library/MT5/libzmq.dll and Library/MT5/libsodium.dll
// For MT4 32-bit, use Library/MT4/libzmq.dll and Library/MT4/libsodium.dll
// Note: The DLLs require the latest Visual C++ runtime (2015).
// For MT5 32-bit, comment out the __X64__ macro definition in Include/Mql/Lang/Native.mqh

// Example of how to initialize ZMQ context (actual implementation would be more complex)
int OnInit() {
    // Initialize ZMQ context
    ZmqContext = ZmqContextCreate();
    if (ZmqContext == 0) {
        Print("Failed to create ZMQ context");
        return(INIT_FAILED);
    }
    Print("ZMQ context created successfully");
    return(INIT_SUCCEEDED);
}

void OnDeinit(const int reason) {
    // Clean up ZMQ context
    if (ZmqContext != 0) {
        ZmqContextDestroy(ZmqContext);
        Print("ZMQ context destroyed");
    }
}

```

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