vs2005 MFC 显示图片的问题

[jingjing_123]

BOOL CMyTestRecDlg::OnEraseBkgnd(CDC* pDC)
{
	// TODO: Add your message handler code here and/or call default
	CBitmap hBG;
	HBITMAP hOldB;
	BITMAP bm;
	HDC hDst;//memory dc
	CClientDC hdc(this);
	hDst = CreateCompatibleDC(NULL);
	hBG.LoadBitmap(IDB_BG); 
	hBG.GetBitmap(&bm);
	hOldB=(HBITMAP)SelectObject(hDst, hBG);
	BmpDrawToDC(hDst,201,31,IDB_REC_NOR);//资源ID    都是bmp的图片
	
	StretchBlt(hdc,0,0,bm.bmWidth,bm.bmHeight,hDst,0,0,bm.bmWidth,bm.bmHeight,SRCCOPY);
	SelectObject(hDst,hOldB);	
	DeleteObject(hBG);	
	DeleteObject(hDst);	
	return true;
}

bool CMyTestRecDlg::BmpDrawToDC( HDC _dc, int PosX, int PosY, int ResID)
{
	HDC _hTemp;
	CBitmap _hbg;
	HBITMAP _hOld;
	BITMAP bm;

	_hTemp = CreateCompatibleDC(NULL);	
	_hbg.LoadBitmap(ResID);
	_hbg.GetBitmap(&bm);

	_hOld = (HBITMAP)SelectObject(_hTemp,_hbg);

	StretchBlt(_dc,PosX,PosY,bm.bmWidth,bm.bmHeight,_hTemp,
		0,0,bm.bmWidth,bm.bmHeight,SRCCOPY);
	SelectObject(_hTemp,_hOld);
	DeleteObject(_hTemp);
	DeleteObject(_hbg);
	return TRUE;
}

调用BmpDrawToDC函数图片资源IDB_REC_NOR总不能贴在hDst上面,在vc6.0 MFC 里面都是可以的,在vs2005 PPC 的MFC里面怎么都贴不上去,大家看看这是怎么回事?

[儿大不由爷]

StretchBlt(hdc,0,0,bm.bmWidth,bm.bmHeight,hDst,0,0,bm.bmWidth,bm.bmHeight,SRCCOPY);
BmpDrawToDC(hDst,201,31,IDB_REC_NOR);//资源ID 都是bmp的图片

调一下顺序，如何？

[jingjing_123]

搞定,揭贴[code=C/C++]
BOOL CMyTestRecDlg::OnEraseBkgnd(CDC* pDC)
{
// TODO: Add your message handler code here and/or call default
BITMAP bm;
CBitmap hBG;
CDC MemDC;
CBitmap MemBitmap;
hBG.LoadBitmap(IDB_BG); //背景图片
hBG.GetBitmap(&bm);//获取图片的大小 这里也可以直接给出大小,就不用 先LoadBitmap() 和GetBitmap()了

MemDC.CreateCompatibleDC(NULL);

MemBitmap.CreateCompatibleBitmap(pDC, bm.bmWidth, bm.bmHeight);
CBitmap *pOldBit=MemDC.SelectObject(&MemBitmap);

BmpDrawToDC(MemDC,0,0, IDB_BG);//帖背景图片
BmpDrawToDC(MemDC,M_BtnPos[0].left,M_BtnPos[0].top, IDB_REC_NOR);//贴按钮

StretchBlt(pDC->GetSafeHdc(),0,0,bm.bmWidth,bm.bmHeight,MemDC,0,0, bm.bmWidth, bm.bmHeight,SRCCOPY);


DeleteObject(hBG);

MemBitmap.DeleteObject();
MemDC.DeleteDC();



//return CDialog::OnEraseBkgnd(pDC);
return true;
}

bool CMyTestRecDlg::BmpDrawToDC( HDC _dc, int PosX, int PosY, int ResID)
{
HDC _hTemp;
CBitmap _hbg;
HBITMAP _hOld;
BITMAP bm;

_hTemp = CreateCompatibleDC(NULL);
_hbg.LoadBitmap(ResID);
_hbg.GetBitmap(&bm);

_hOld = (HBITMAP)SelectObject(_hTemp,_hbg);

StretchBlt(_dc,PosX,PosY,bm.bmWidth,bm.bmHeight,_hTemp,
0,0,bm.bmWidth,bm.bmHeight,SRCCOPY);
SelectObject(_hTemp,_hOld);
DeleteObject(_hTemp);
DeleteObject(_hbg);
return TRUE;
}


code]

[jingjing_123]

hDst是内存DC啊,要先画在内存DC上才能刷出来

[儿大不由爷]

是我看错了

[儿大不由爷]

要画的Bitmap加载成功了么？