消息在多线程中实现异步通信

1）自定义消息ID

#define WM_MYMESSAGE WM_APP+1

2）消息接收处理函数

void __fastcall CMMessage(TMessage &msg);

void __fastcall TActFrm::CMMessage(TMessage &msg)
{
g_logFile.print("receive msg.\n");
if(msg.WParam == 0){

}else if(msg.WParam == 1){


}
}

3）消息交给CMMessage 函数处理

BEGIN_MESSAGE_MAP
VCL_MESSAGE_HANDLER(WM_MYMESSAGE,TMessage,CMMessage)
//决定WM_MYMESSAGE消息交给CMMessage 函数处理
END_MESSAGE_MAP(TActiveForm)

4）在多线程文件中头文件如下

ifndef ThreadH
#define ThreadH
//---------------------------------------------------------------------------
#include <Classes.hpp>
//---------------------------------------------------------------------------

class TMyThread : public TThread
{
private:
LPVOID m_handle;
protected:
void __fastcall Execute();
void __fastcall FtpDwonLoad(); //自定义函数
public:
__fastcall TMyThread(bool CreateSuspended,LPVOID handle);


void __fastcall DwonLoad(char *sourceFile,char* strFile); //DownFile
};

#endif

5）多线程的cpp文件如下

__fastcall TMyThread::TMyThread(bool CreateSuspended,LPVOID handle)
: TThread(CreateSuspended)
{
m_handle = handle;
}

void __fastcall TMyThread::Execute()
{
DwonLoad(gDown,gListen);
PostMessage(m_handle,WM_MYMESSAGE,0,0);

}

void __fastcall TMyThread::DwonLoad(char *sourceFile,char* strFile)
{

}

6）多线程的使用：

先定义 TMyThread *thread1;

初始化：thread1=new TMyThread(true,Handle);

后启动：thread1->Resume();

最后停止： thread1->Terminate();