Drawing Application Problem

[Leibnitz]

I have created a very basic MFC Application but when i run it, it use 100% of my CPU resources. Here is the code:

#include <afxwin.h>

class CDrawingApp : public CWinApp {
public:
	virtual BOOL InitInstance();
	CDrawingApp() {};
};

class CMainFrame : public CFrameWnd {
public:
	CMainFrame() {
		Create( NULL, "DrawingApp" );
	}
	afx_msg void OnPaint();
	DECLARE_MESSAGE_MAP()
};

BEGIN_MESSAGE_MAP( CMainFrame, CFrameWnd )
	ON_WM_PAINT()
END_MESSAGE_MAP()


BOOL CDrawingApp::InitInstance() {
	m_pMainWnd = new CMainFrame;
	m_pMainWnd->ShowWindow(SW_SHOW);
	m_pMainWnd->UpdateWindow();
	return TRUE;
}

void CMainFrame::OnPaint() {
	CDC *pDC = GetDC();
	CRect lpRect;
	lpRect.left = 50;
	lpRect.top = 50;
	lpRect.right = 300;
	lpRect.bottom = 300;
	pDC->Rectangle(lpRect);
	ReleaseDC(pDC);
}

CDrawingApp theApp;

Can anybody tell me what am i doing wrong?

 

[Leibnitz]

alright,i have figure it out,i had to use:

PAINTSTRUCT ps;
CDC *pDC = BeginPaint(&ps);
....
....
EndPaint(&ps)

instead of:

CDC *pDC = GetDC();
....
...
ReleaseDC(pDC);

inside the OnPaint message.