#define WM_MY_MESSAGE      WM_USER + 100       //---------------------by tyds

//{{AFX_MSG(CPostmessageView)
afx_msg void Ontydspostmessage();

afx_msg /*LRESULT*/ void OnMyMessage(/*WPARAM wParam, LPARAM lParam*/); //----- by tyds

//}}AFX_MSG
DECLARE_MESSAGE_MAP()

BEGIN_MESSAGE_MAP(CPostmessageView, CView)
//{{AFX_MSG_MAP(CPostmessageView)
ON_COMMAND(ID_tyds_postmessage, Ontydspostmessage)
ON_MESSAGE(WM_MY_MESSAGE, OnMyMessage)      //添加消息映射---------------------by tyds
//}}AFX_MSG_MAP
// Standard printing commands
ON_COMMAND(ID_FILE_PRINT, CView::OnFilePrint)
ON_COMMAND(ID_FILE_PRINT_DIRECT, CView::OnFilePrint)
ON_COMMAND(ID_FILE_PRINT_PREVIEW, CView::OnFilePrintPreview)
END_MESSAGE_MAP()

void CPostmessageView::Ontydspostmessage()
{
MessageBox("begin post message!");
//PostMessage(WM_MY_MESSAGE);     //這里 PostMessage SendMessage 兩則區別是
SendMessage(WM_MY_MESSAGE);       //PostMessage 是發出去就返回 而SendMessage是發出去等到被執行了再返回
}

消息相應函數
/*LPESULT*/void   CPostmessageView::OnMyMessage(/*WPARAM wParam, LPARAM lParam*/) //注意這里的參數可要可不要 根據自己來定 返回值也一樣
{

MessageBox("post msg finished!");
// return 0;
}