MFC 新增消息处理函数

 

    在MFC中添加一个消息处理函数的方法有（比如在CxxxView类中）：

1.在CxxxView类上点右键，选择add windows message handler, 选择消息类型，点Add Handler,然后点击Edit Exiting 。

2.在菜单栏，查看，建立类向导，选择项目名，类名，消息类型，点“Add Function”,"Edit code"。

 

这两种方法会自动生成部分代码：

1.双击CxxxView 会发现在xxxView.h文件中

 protected:

// Generated message map functions
protected:
 //{{AFX_MSG(CMyTestSingleView)
  // NOTE - the ClassWizard will add and remove member functions here.
  //    DO NOT EDIT what you see in these blocks of generated code !
 //}}AFX_MSG
 DECLARE_MESSAGE_MAP()

 

变为了：

protected:

// Generated message map functions
protected:
 //{{AFX_MSG(CDrawView)
 afx_msg void OnLButtonDown(UINT nFlags, CPoint point);
 //}}AFX_MSG
 DECLARE_MESSAGE_MAP()

 

2.双击CxxxView()函数，在xxxView.cpp文件中

BEGIN_MESSAGE_MAP(CMyTestSingleView, CView)
 //{{AFX_MSG_MAP(CMyTestSingleView)
  // 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, CView::OnFilePrint)
 ON_COMMAND(ID_FILE_PRINT_DIRECT, CView::OnFilePrint)
 ON_COMMAND(ID_FILE_PRINT_PREVIEW, CView::OnFilePrintPreview)
END_MESSAGE_MAP()

 

变为：

 

BEGIN_MESSAGE_MAP(CDrawView, CView)
 //{{AFX_MSG_MAP(CDrawView)
 ON_WM_LBUTTONDOWN()
 //}}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()

 

3.消息函数的实现部分，同样在xxxView.cpp中

 

void CDrawView::OnLButtonDown(UINT nFlags, CPoint point)
{
 // TODO: Add your message handler code here and/or call default

 CView::OnLButtonDown(nFlags, point);
}