我要将CBitmap里的图片缩小，请问各位高人应该怎样做

[woodwmh]

我要将CBitmap里的图片缩小，请问各位高人应该怎样做

[woodwmh]

各位，请帮帮我吧！

[ygd]

BitBlt

[prometheusphinx]

void CMyDlg::OnPaint()
{
CPaintDC dc( this ); // Device context for painting

CBitmap bmp, *poldbmp;
CDC memdc;

// Load the bitmap resource
bmp.LoadBitmap( IDB_CORPLOGO );

// Create a compatible memory DC
memdc.CreateCompatibleDC( &dc );

// Select the bitmap into the DC
poldbmp = memdc.SelectObject( &bmp );

// Copy (BitBlt) bitmap from memory DC to screen DC
dc.StretchBlt( 10, 10, 47, 47, &memdc, 0, 0, 100, 100, SRCCOPY );

memdc.SelectObject( poldbmp );

// Do not call CDialog::OnPaint() for painting messages
}

[Colin-Han]

MSDN里面有！

[WingfireWu]

CDC dcSrc;
CDC dcDst;
dcSrc.CreateCompatibleDC(NULL);
dcDst.CreatecompatibleDC(NULL);

CBitmap *pbmpStockSrc = dcSrc.SelectObject(pbmpOld);

CBitmap *pbmpNew = new CBitmap();
bmpNew.CreateCompatibleBmp(&dcSrc, newX, newY);
CBitmap *pbmpStockDest = dcDst.SelectObject(pbmpNew);
dcDst.StretchBlt(0，0，newX, newY, &dcSrc, oldX, oldY, SRCCOPY);

dcSrc.SelectObject(pbmpStockSrc);
dcDst.SelectObject(pbmpStockDst);

// pbmpNew就是缩小了的位图

[kook]

SetStretchBltMode
StretchBlt

控制目标的位置和大小即可

[woodwmh]

谢谢了！小弟比较菜，希望以后大家多多指教！！

[prometheusphinx]

StretchBlt

[woodwmh]

能说得具体点吗？谢谢了