原文：

 

BEGIN_MESSAGE_MAP(CMy1Dlg, CDialog)

 //{

{AFX_MSG_MAP(CMy1Dlg)

 ON_WM_SYSCOMMAND()

 ON_WM_PAINT()

 ON_WM_QUERYDRAGICON()

 ON_BN_CLICKED(IDC_BUTTON1, OnButton1)

 //}}AFX_MSG_MAP

END_MESSAGE_MAP()

 AFX_MSG_MAP ，这个宏是MFC用来构造消息映射表时用到的辅助宏，它埋在类识别宏或动态识别宏中

BEGIN_MESSAGE_MAP(CMy3View, CFormView)

 //{

{AFX_MSG_MAP(CMy3View)

  // NOTE - the ClassWizard will add and remove mapping macros here.

  //    DO NOT EDIT what you see in these blocks of generated code!

 //}}AFX_MSG_MAP

 // Standard printing commands

 ON_COMMAND(ID_FILE_PRINT, CFormView::OnFilePrint)

 ON_COMMAND(ID_FILE_PRINT_DIRECT, CFormView::OnFilePrint)

 ON_COMMAND(ID_FILE_PRINT_PREVIEW, CFormView::OnFilePrintPreview)

END_MESSAGE_MAP()

 

 //{

{AFX_DATA(CMy4Dlg)

 enum { IDD = IDD_MY4_DIALOG };

  // NOTE: the ClassWizard will add data members here

 //}}AFX_DATA

public:

 //{

{AFX_DATA(CMy3View)

 enum{ IDD = IDD_MY3_FORM };

  // NOTE: the ClassWizard will add data members here

 //}}AFX_DATA

//{

{AFX_DATA_MAP    组件数据与组件间的映射

 Afx_MSG

 

  发现注释AFX_MSG_MAP和AFX_DATA等宏不能删除，无论在基于对话框还是SDI，MDI中都不能删除，否则将出现cannot add new member 等错误，或双击控件不能进入事件处理。编译器需要！(VC6中，VC2010木有这些)