init时指针错误求助
#ifndef _HELLO_MFC_H_
#define _HELLO_MFC_H_
class CMyAPP : public CWinApp
{
public:
virtual BOOL InitInstance();
};
class CMainWindow : public CFrameWnd
{
public:
CMainWindow();
protected:
afx_msg void OnPaint();
DECLARE_MESSAGE_MAP();
};
#endif // _HELLO_MFC_H
#include <afxwin.h>
#include "HelloMFC.h"
BOOL CMyAPP::InitInstance()
{
m_pMainWnd = new CMainWindow;
m_pMainWnd->ShowWindow(m_nCmdShow);
m_pMainWnd->UpdateWindow();
return TRUE;
}
BEGIN_MESSAGE_MAP(CMainWindow, CFrameWnd)
ON_WM_PAINT()
END_MESSAGE_MAP()
CMainWindow::CMainWindow()
{
Create(NULL, TEXT("The Hello"));
}
void CMainWindow::OnPaint()
{
CPaintDC dc(this);
CRect rect;
GetClientRect(&rect);
dc.DrawText( TEXT("Hello MFC"), -1, &rect,
DT_SINGLELINE|DT_CENTER|DT_VCENTER );
}
就照MFC Windows程序设计抄来的啊 怎么会出现指针错误呢?
神奇
在InitInstance的第一句话前面 加个 ::MessageBox( NULL, TEXT("HEHE"), TEXT("HEHE"), MB_OK ); 都输出不出来...