MFC message mapping mechanism (BEGIN_MESSAGE_MAP and END_MESSAGE_MAP)

 

DECLARE_MESSAGE_MAP()

BEGIN_MESSAGE_MAP(CtestDialogDlg, CDialogEx)
    ON_WM_PAINT()            //OnPaint()
    ON_WM_QUERYDRAGICON()    //
    ON_WM_SYSCOMMAND()        //OnSysCommand()
    ON_WM_SIZE()            //OnSize()
    ON_MESSAGE(WM_USER_MSG, &CtestDialogDlg::OnUserMsg) //自定义消息
...









END_MESSAGE_MAP()

A custom message:
1. The header file
#define WM_USER_MSG (of WM_USER +. 1) 
afx_msg LRESULT OnUserMsg (WPARAM the wParam, LPARAM the lParam);
2. CPP file
BEGIN_MESSAGE_MAP (CtestDialogDlg, CDialogEx)
    the ON_MESSAGE (WM_USER_MSG, & CtestDialogDlg :: OnUserMsg) // custom message
END_MESSAGE_MAP ()
afx_msg LRESULT CtestDialogDlg :: OnUserMsg (WPARAM the wParam, LPARAM the lParam)
{
    ....
    return 0;
}