c++ - 如何将 "this"指针传递给全局函数

Question

//This is AsynchronousFunction class header file

typedef int (*functionCall)(int, int);

DWORD __stdcall functionExecuter(LPVOID pContext); // global function

class  AsynchronousFunction
{   

  int param1, param2;
  functionCall fCall;
  HANDLE m_handle;

public:
  AsynchronousFunction(functionCall, int, int);
  ~AsynchronousFunction();
  int result();

protected:
private:
  int returnVal; 

};


It's implementation as follows

AsynchronousFunction::AsynchronousFunction(functionCall fCall, int param1, int       param2):m_handle(CreateEvent( NULL , false , false , NULL))
{
  bool b = QueueUserWorkItem(functionExecuter, this, WT_EXECUTEDEFAULT);

  WaitForSingleObject(m_handle, INFINITE);
  SetEvent(m_handle);
}

AsynchronousFunction::~AsynchronousFunction()
{
  CloseHandle(m_handle);
}

int AsynchronousFunction::result()
{

  return 0;// not implemented yet

}

DWORD __stdcall functionExecuter(LPVOID pContext)
{

  return 0;

}

此处 pContext 接收“this”指针。我的尝试是访问 param1 和 param2
从这里开始工作我该怎么做？

Answer 1

或者你可以让 functionExecuter 成为 AsynchronousFunction 的友元或者在 AsynchronousFunction 中添加一个公共(public)函数，它执行所需的操作并从 functionExecuter 中调用它，如下所示。

DWORD __stdcall functionExecuter(LPVOID pContext)
{
  return (reinterpret_cast<AsyncrhonousFunction*>(pContext))->realFunctionExecuter();
}