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#define WM_REGIONCIRCLE WM_USER+1001
class CMFCDLLApp : public CWinApp
{
public:
CMFCDLLApp();
// Overrides
afx_msg LRESULT DrawCircle(WPARAM wParam,LPARAM lParam);
DECLARE_MESSAGE_MAP()
};
BEGIN_MESSAGE_MAP(CMFCDLLApp, CWinApp)
ON_MESSAGE(WM_REGIONCIRCLE,DrawCircle) //这里编译出错
END_MESSAGE_MAP()