win98与win2000的双缓冲设置是不是有不同................急

[eastrock]

我在win2000运行了好久都没有问题，而一到win98下运行，问题就出来了。那么如果要在win98下也能行，那要如何了。请指点。
程序如下：

CDC memBufDC, memSrcDC;
memBufDC.CreateCompatibleDC(pDC);
memSrcDC.CreateCompatibleDC(pDC);

//创建内存的缓冲位图
CBitmap Bufbmp;
Bufbmp.CreateCompatibleBitmap(pDC, FaceWidth, FaceHeight);
CBitmap* pOldBufBitmap = memBufDC.SelectObject(&Bufbmp);

CBitmap bitmap;
bitmap.LoadBitmap(IDB_BTIMAP);//引入背景位图
CBitmap* pOldSrcBitmap = memSrcDC.SelectObject(&bitmap);

memBufDC.BitBlt(0, 0, FaceWidth, FaceHeight, &memSrcDC, 0, 0, SRCCOPY);
memSrcDC.SelectObject(pOldSrcBitmap);
bitmap.DeleteObject();
while (/*100个循环*/)
{
//IDB_BTIMAPi是置于IDB_BITMAPj的下面，要形成一个椭圆，因背景图是黑白格
bitmap.LoadBitmap(IDB_BITMAP1);
pOldSrcBitmap = memSrcDC.SelectObject(&bitmap);
memBufDC.BitBlt(i, j, Width, Height, &memSrcDC, 0, 0, SRCPAINT);
memSrcDC.SelectObject(pOldSrcBitmap);
bitmap.DeleteObject();
bitmap.LoadBitmap(IDB_BTIMAPj);//引入的位图不断地变化
pOldSrcBitmap = memSrcDC.SelectObject(&bitmap);
memBufDC.BitBlt(i,j, Width, Height, &memSrcDC, 0, 0, SRCAND);
memSrcDC.SelectObject(pOldSrcBitmap);
bitmap.DeleteObject();
}

pDC->BitBlt(0, 0, 600, 600, &memBufDC, 0, 0, SRCCOPY);
//恢复对象
memBufDC.SelectObject(pOldBufBitmap);
Bufbmp.DeleteObject();