Re: Copying bitmap into clipboard

From:
"David Ching" <dc@remove-this.dcsoft.com>
Newsgroups:
microsoft.public.vc.mfc
Date:
Tue, 6 Jan 2009 05:37:10 -0800
Message-ID:
<73E707D3-2C9A-4BA3-A8C2-C1745D775212@microsoft.com>
"Peter" <Peter@discussions.microsoft.com> wrote in message
news:7E9B38B5-A43F-45CF-9886-CD75BBC7645C@microsoft.com...

Hi,
I am trying to use following code for copying bitmap into clipboard,
but when I try to paste into mspaint, then result is only black square.
What is wrong with following code ?

void CopyBitmapIntoClipboard(HBITMAP bitmaph)
{
CBitmap *bitmapFromGraphList = CBitmap::FromHandle(bitmaph);
BITMAP bitmapStruct;
memset(&bitmapStruct, 0, sizeof(bitmapStruct));
bitmapFromGraphList->GetObject(sizeof(BITMAP),&bitmapStruct);
CBitmap localBitmap;
localBitmap.CreateBitmapIndirect(&bitmapStruct);
CDC dcMemSrc, dcMemDest;
dcMemSrc.CreateCompatibleDC(NULL);
CBitmap* oldBitmapSrc = dcMemSrc.SelectObject(bitmapFromGraphList);
dcMemDest.CreateCompatibleDC(NULL);
CBitmap* oldBitmapDest=dcMemDest.SelectObject(&localBitmap);// It returns
NULL !
dcMemDest.BitBlt(0,0,bitmapStruct.bmWidth, bitmapStruct.bmHeight,
&dcMemSrc,
0, 0, SRCCOPY);

HBITMAP toClipboard = (HBITMAP)localBitmap.Detach();
dcMemDest.SelectObject(oldBitmapDest);
dcMemSrc.SelectObject(oldBitmapSrc);

if ( !OpenClipboard() )
 return;
if( !EmptyClipboard() )
 return;
HANDLE setDataHandle = ::SetClipboardData( CF_BITMAP, toClipboard );
if (setDataHandle == NULL ) {
 CloseClipboard();
 return;
}
CloseClipboard();
}


It looks fine to me. Can you test this code by blting dcMemDest in an
OnPaint() handler to the screen DC to make sure the localBitmap is correct?
Then you can tell if the bitmap is being copied correctly or if the
clipboard is being set wrong.

-- David

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