Ask the heroes for help: Why can't the simplest LButton messages respond?

zhang_huayu

Hum, I started to suffer from learning vc. I wrote a win32 Application under VC. After running, it can't respond to the left and right mouse buttons. The code is as follows:

#include <afxwin.h>
class CMyApp: public CWinApp
{
public:
virtual BOOL InitInstance ();
};
class CMainWnd: public CFrameWnd
{
protected:
afx_msg void OnLButtonDown (UINT nFlags, CPoint point);
afx_msg void OnRButtonDown (UINT nFlags, CPoint point);
public:
DECLARE_MESSAGE_MAP ()
};
///////////////////////////////////////////////////////// ///////

BEGIN_MESSAGE_MAP (CMainWnd, CFrameWnd)
ON_WM_RBUTTONDOWN ()
ON_WM_LBUTTONDOWN ()
END_MESSAGE_MAP ()
void CMainWnd :: OnLButtonDown (UINT nFlags, CPoint point)
{
// MessageBox ("left-click");
CDC * pDC = GetDC ();
pDC-> TextOut (point.x, point.y, "hello", 5);
CFrameWnd :: OnLButtonDown (nFlags, point);
}
void CMainWnd :: OnRButtonDown (UINT nFlags, CPoint point)
{
MessageBox ("right-click");
CFrameWnd :: OnRButtonDown (nFlags, point);
}
BOOL CMyApp :: InitInstance ()
{
CFrameWnd * p = new CFrameWnd;
p-> Create (0, "yang");
p-> ShowWindow (SW_SHOWDEFAULT);
p-> UpdateWindow ();
// AfxGetApp ()-> m_pMainWnd = p;
this-> m_pMainWnd = p;
return TRUE;
}
CMyApp myapp;

爱德华德

You move the mouse to the edge of the entire form and click the mouse to see

mystonelh

Your WM_RBUTTONDOWN WM_LBUTTONDOWN message functions are defined in the main frame class, only click on the main frame idea frame form (in MDI, the sub frame form is above the main frame form, the window body is in the sub frame form (On), it will respond, you should have a visual class, click on the visual will not respond, only the message function try to put in the visual class

afanti_007

It should be upstairs, you should respond to the message of the framework, not the client area

2511718

First convert the screen coordinates to the client area coordinates
ScreenToClient (&point);

If you want to convert to window coordinates, write a function
void CMainFrame :: ScreenToWindow (LPPOINT lpPoint)
{
   CRect rc;
   GetWindowRect (&rc);
   lpPoint-> x-= rc.left;
   lpPoint-> y-= rc.top;
}

sing2002

personal opinion:
Respond to mouse clicks in MainFrame ??

I think it should be responded to in the View!

zhang_huayu

Thank you guys first, let me give it a try!

zhang_huayu

Thank you heroes, see hope!

zhang_huayu

But this is a project I built with win32 application, not mfc. It is said that I did not consider generating CView objects. If it is sdi or mdi generated by mfc, the first one to capture the mouse is the view, but I am at all Without view, is it difficult to have a view class as long as you use a framework class? Even if it is generated with win32 application is no exception.

Please also master to help. Please!

2511718

First understand the document view structure