为何显示黑乎乎的一片，chick!!!!!!!

[eastrock]

void CHeQiQiView::OnDraw(CDC* pDC)
{
CRect rt;
GetClientRect(rt);

HBITMAP hbmp=LoadBitmap(AfxGetApp()->m_hInstance, (LPCTSTR)IDB_BITMAP);

HDC memBufDC=CreateCompatibleDC(pDC->m_hDC);
HDC memSrcDC=CreateCompatibleDC(pDC->m_hDC);

HBITMAP hbmpOld=(HBITMAP)SelectObject(memSrcDC,hbmp);

for(int i=0;i<600;i+=15)
{
BitBlt(memBufDC, i, 0, 15, 15,memSrcDC,0,0,SRCCOPY);
}
HBITMAP hBufBmp = CreateCompatibleBitmap(pDC->m_hDC, rt.right, rt.bottom-100);
HBITMAP hOldBufBmp = (HBITMAP)SelectObject(memBufDC, hBufBmp);

BitBlt(pDC->m_hDC, 0, 0, rt.right, rt.bottom-100, memBufDC, 0, 0, SRCCOPY);

SelectObject(memSrcDC,hbmpOld);
SelectObject(memBufDC, hOldBufBmp);
DeleteObject(hBufBmp);
DeleteDC(memBufDC);
}

显示的结果，是显示黑乎乎的一片，这出错在那儿，能给我看一下吗。3x

[lvfengxun]

基本概念问题
void CHeQiQiView::OnDraw(CDC* pDC)
{
CRect rt;
GetClientRect(rt);

HBITMAP hbmp=LoadBitmap(AfxGetApp()->m_hInstance, (LPCTSTR)IDB_BITMAP);

HDC memBufDC=CreateCompatibleDC(pDC->m_hDC);
HDC memSrcDC=CreateCompatibleDC(pDC->m_hDC);

HBITMAP hbmpOld=(HBITMAP)SelectObject(memSrcDC,hbmp);
HBITMAP hBufBmp = CreateCompatibleBitmap(pDC->m_hDC, rt.right, rt.bottom-100);
HBITMAP hOldBufBmp = (HBITMAP)SelectObject(memBufDC, hBufBmp);

for(int i=0;i<600;i+=15)
{
BitBlt(memBufDC, i, 0, 15, 15,memSrcDC,0,0,SRCCOPY);
}

BitBlt(pDC->m_hDC, 0, 0, rt.right, rt.bottom-100, memBufDC, 0, 0, SRCCOPY);

SelectObject(memSrcDC,hbmpOld);
SelectObject(memBufDC, hOldBufBmp);
DeleteObject(hBufBmp);
DeleteDC(memBufDC);
}

[coolxiao]

HBITMAP hBufBmp = CreateCompatibleBitmap(pDC->m_hDC, rt.right, rt.bottom-100);
HBITMAP hOldBufBmp = (HBITMAP)SelectObject(memBufDC, hBufBmp);

这样做你原来选进去的图不就没有了吗？新建的位图象素默认为0,就是黑色啊，然后再bitblt到dc中，当然就是黑色一片了。
能不能讲一下你的思路，因为不太明白你前面的哪个循环，既然只是一幅图，何必bitblt这么多次呢？

[eastrock]

3x.问题解决了。
HBITMAP hBufBmp = CreateCompatibleBitmap(pDC->m_hDC, rt.right, rt.bottom-100);
----------------------------
HBITMAP hOldBufBmp = (HBITMAP)SelectObject(memBufDC, hBufBmp);
是我在测试时随便做的
3x

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