自定義訊息

一、自定義視窗訊息

1. #define WM_MY_MSG WM_USER + 0x100
2. afx_msg LRESULT OnMyMsg(WPARAM, LPARAM);

LRESULT CTestDlg::OnMyMsg(WPARAM wParam, LPARAM lParam)
   {...}

BEGIN_MESSAGE_MAP(CTestDlg, CDialog)
    ...
    ON_MESSAGE(WM_MY_MSG, &CTestDlg::OnMyMsg)
END_MESSAGE_MAP()

二、自定義執行緒訊息

1. #define WM_MY_THRD_MSG WM_USER + 100
2. afx_msg void OnMyThrdMsg(WPARAM, LPARAM);

void CTestApp::OnMyThrdMsg(WPARAM wParam, LPARAM lParam)
   {...}

BEGIN_MESSAGE_MAP(CTestApp, CWinAppEx)
    ...
    ON_THREAD_MESSAGE(WM_MY_THRD_MSG, &CTestApp::OnMyThrdMsg)
END_MESSAGE_MAP()

那怎樣在當前執行緒中觸發訊息呢？有以下兩種方法：

::PostMessage(NULL, WM_MY_THRD_MSG, 0
 
, 0);
::PostThreadMessage(::GetCurrentThreadId(), WM_MY_THRD_MSG, 0, 0);