class CMyApp:public CWinApp
{
	virtual BOOL InitInstance()
	{
		CMainDlg dlg;
		dlg.DoModal();
		//DialogBox(
	//	AfxMessageBox("由Win32工程转换而成MFC软件工程");
		return TRUE;
	}

};
CMyApp theApp;


BEGIN_MESSAGE_MAP(CMainDlg, CDialog)
	//{{AFX_MSG_MAP(CMainDlg)
	ON_WM_LBUTTONDOWN()
	ON_WM_MOUSEMOVE()
	ON_WM_PAINT()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMainDlg message handlers
//WM_INITDIALOG 在对话框还未显示出来时，做准备工作
BOOL CMainDlg::OnInitDialog() 
{
	CDialog::OnInitDialog();
	SetWindowText("InitDialog");
	HICON hIcon = LoadIcon(AfxGetInstanceHandle(),(LPCSTR)IDI_ICON1);
	SetIcon(hIcon,FALSE);
	return TRUE;  // return TRUE unless you set the focus to a control
	              // EXCEPTION: OCX Property Pages should return FALSE
}

void CMainDlg::OnLButtonDown(UINT nFlags, CPoint point) 
{
	CString str;
	str.Format("x=%d,y=%d",point.x,point.y);

	if(MK_CONTROL & nFlags)
		str += " 按下了Ctrl";
	if(MK_SHIFT & nFlags)
		str += " 按下了Shift";

	AfxMessageBox(str);
	CDialog::OnLButtonDown(nFlags, point);
}

void CMainDlg::OnMouseMove(UINT nFlags, CPoint point) 
{
	CString str;
	str.Format("x=%d,y=%d",point.x,point.y);

	if(MK_CONTROL & nFlags)
		str += " 按下了Ctrl";
	if(MK_SHIFT & nFlags)
		str += " 按下了Shift";
	if(MK_LBUTTON & nFlags)
		str += " 按下了左键";
	if(MK_RBUTTON & nFlags)
		str += " 按下了右键";
	SetWindowText(str);
	CDialog::OnMouseMove(nFlags, point);
}

void CMainDlg::OnPaint() 
{
	CPaintDC dc(this); // device context for painting
	dc.Ellipse(10,10,200,150);
}

MK_CONTROL Set if the CTRL key is down.

• MK_LBUTTON Set if the left mouse button is down.

• MK_MBUTTON Set if the middle mouse button is down.

• MK_RBUTTON Set if the right mouse button is down.

• MK_SHIFT Set if the SHIFT key is down. ————————————————

point

Specifies the x- and y-coordinate of the cursor. These coordinates are always relative to the upper-left corner of the window. ————————————————

原文链接：https://blog.csdn.net/u012881904/article/details/48420019

原文链接：https://blog.csdn.net/u012881904/article/details/48420019