PostThreadMessage

BOOL WINAPI PostThreadMessage(_In_ DWORD idThread,_In_ UINT Msg,_In_ WPARAM wParam,_In_ LPARAM lParam);

idThread -      [in] Type: DWORD The identifier of the thread to which the message is to be posted.

Msg     -       [in] Type: UINT The type of message to be posted.

wParam -        [in] Type: WPARAM Additional message-specific information.

lParam -        [in] Type: LPARAM Additional message-specific information.

也就是说为了使用这个API我们只要提供接受线程的线程ID以及相应的参数就行了，如下是代码实现，首先创建worker thread 并且在worker thread中创建消息循环，这样当我们在主线程中PostThreadMessage的时候worker thread就可以对进来的消息进行处理了，我们可以给worker thread发送TALK_MESSAGE，WM_QUIT message, 一旦worker thread收到WM_QUIT message, worker thread将报告给主线程自己要退出了，然后结束自己的生命周期。

DWORD ThreadProc(LPVOID lParam)

{

        MSG msg;

        while(GetMessage(&msg,0,0,0))

        {

                if(msg.message == TALK_MESSAGE)

                {

                        MessageBox(NULL,L"Hi",L"Worker Thread",MB_OK);

                }

                DispatchMessage(&msg);

        }

        MessageBox(NULL,L"Thread will close by pressing OK",L"From Worker Thread",MB_OK);

        AfxGetApp()->m_pMainWnd->PostMessageW(TALK_MESSAGE+1,0,0);

        return 0;

}

void CPostThreadMSGDlg::OnBnClickedOk()

{

        CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)ThreadProc,0,0,&m_dwThread);

        ::MessageBox(NULL,L"Worker Thread Created!",L"From main Thread",MB_OK);

        OnOK();

}

void CPostThreadMSGDlg::OnBnClickedButtonHi()

{

        PostThreadMessage(m_dwThread,TALK_MESSAGE,0,0);

}

void CPostThreadMSGDlg::OnBnClickedButtonCllose()

{

        PostThreadMessage(m_dwThread,WM_QUIT,0,0);

}

LONG CPostThreadMSGDlg::OnWorkerThreadQuitFunction(WPARAM wParam, LPARAM lParam)

{      

        ::MessageBox(NULL,L"Main thread have known Worker Thread died!",L"From main Thread",MB_OK);

        return 0;

}