C++ TCP 套接字插件

Question

我目前正在使用模拟引擎 VBS2 并尝试编写一个 TCP 套接字插件。我有一个客户端应用程序，我想连接到插件并发送一条消息。如果我发布现有的插件代码，这可能会更有意义:

#include <windows.h>
#include "VBSPlugin.h"

// Command function declaration
typedef int (WINAPI * ExecuteCommandType)(const char *command, char *result, int resultLength);

// Command function definition
ExecuteCommandType ExecuteCommand = NULL;

// Function that will register the ExecuteCommand function of the engine
VBSPLUGIN_EXPORT void WINAPI RegisterCommandFnc(void *executeCommandFnc)
{
  ExecuteCommand = (ExecuteCommandType)executeCommandFnc;
}

// This function will be executed every simulation step (every frame) and took a part     in the simulation procedure.
// We can be sure in this function the ExecuteCommand registering was already done.
// deltaT is time in seconds since the last simulation step
VBSPLUGIN_EXPORT void WINAPI OnSimulationStep(float deltaT)
{
  //{ Sample code:
ExecuteCommand("0 setOvercast 1", NULL, 0);
  //!}
}

// This function will be executed every time the script in the engine calls the script function "pluginFunction"
// We can be sure in this function the ExecuteCommand registering was already done.
// Note that the plugin takes responsibility for allocating and deleting the returned string
VBSPLUGIN_EXPORT const char* WINAPI PluginFunction(const char *input)
{
  //{ Sample code:
  static const char result[]="[1.0, 3.75]";
  return result;
  //!}
}

// DllMain
BOOL WINAPI DllMain(HINSTANCE hDll, DWORD fdwReason, LPVOID lpvReserved)
{
   switch(fdwReason)
   {
      case DLL_PROCESS_ATTACH:
         OutputDebugString("Called DllMain with DLL_PROCESS_ATTACH\n");
         break;
      case DLL_PROCESS_DETACH:
         OutputDebugString("Called DllMain with DLL_PROCESS_DETACH\n");
     break;
      case DLL_THREAD_ATTACH:
         OutputDebugString("Called DllMain with DLL_THREAD_ATTACH\n");
         break;
      case DLL_THREAD_DETACH:
         OutputDebugString("Called DllMain with DLL_THREAD_DETACH\n");
         break;
   }
   return TRUE;
}

发送到插件的消息将通过作为参数传递给 ExecuteCommand() 在 OnSimulationStep() 函数中使用。但是，我还必须小心阻止此处，因为必须允许 OnSimulationStep() 函数运行每个模拟步骤。

几天来我一直盯着这个看，并尝试查看 winsock 教程，但我不是 C++ 程序员，而且感觉很卡。请任何人给我一些正确方向的指示？

提前致谢，非常感谢所有建议。

Answer 1

我个人会选择 boost::asio 来省去处理异步 IO 的所有麻烦。

它使用起来相对简单，并且在插件环境中运行良好 - 我已经做过类似的事情(也在 VBS2 中)。