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dsdd_123

I have a bitmap in the clipboard, and I want to reduce it to 1/5 size (that is, copy the bitmap into a VC program, then manipulate the HBitmap, and then copy it back to the clipboard. How can I achieve this?

lixiaof6471

GetClipboardData => Bitmap process => SetClipboardData

onlymeha

HBITMAP hBitmap = NULL;
if (OpenClipboard ())
{
hBitmap = (HBITMAP) GetClipboardData (CF_BITMAP);
if (hBitmap)
{
CDC * pdc = GetDC ();
CBitmap * pCBmp = new CBitmap;
pCBmp-> Attach (hBitmap);
BITMAP bm;
pCBmp-> GetBitmap (&bm);
CDC dcCompatible;
dcCompatible.CreateCompatibleDC (pdc);
dcCompatible.SelectObject (pCBmp);
CDC dcMemDC;
dcMemDC.CreateCompatibleDC (pdc);
dcMemDC.SetStretchBltMode (COLORONCOLOR);
dcMemDC.SelectObject (pCBmp);
BOOL bBitblt = dcMemDC.StretchBlt (0,0, bm.bmWidth, bm.bmHeight,&dcCompatible, 0,0, bm.bmWidth, bm.bmHeight, SRCCOPY);
DWORD dwErrorCode = GetLastError ();
hBitmap = CreateCompatibleBitmap (dcMemDC.m_hDC, bm.bmWidth / 5, bm.bmHeight / 5);
pCBmp-> Detach ();
pCBmp-> Attach (hBitmap);
pCBmp-> GetBitmap (&bm);
EmptyClipboard ();
HANDLE hTemp = SetClipboardData (CF_BITMAP, hBitmap);
delete pCBmp;
}
CloseClipboard ();
}