Re: CDC::SelectBitmap method

From:
"NickP" <a@a.com>
Newsgroups:
microsoft.public.vc.language
Date:
Thu, 13 Jul 2006 14:48:19 +0100
Message-ID:
<#89J1QopGHA.4116@TK2MSFTNGP03.phx.gbl>
Hi again,

    Just to add, I have run the code in debug mode and have recieved an
assertion failure,

    Expression: hBitmap == 0 || ::GetObjectType(hBitmap) == 7

    Presumably this is saying that the image is not loaded correctly? If
this is the case then I am unsure why the LoadImage function returned a
valid object...

    CBitmap cBMPImage = (HBITMAP)::LoadImage(_Module.GetModuleInstance(),
_T("C:\\Images\\ca.bmp"),IMAGE_BITMAP,0,0,LR_LOADFROMFILE);
    if(cBMPImage==NULL)
    {
        MessageBox(NULL, _T("Image not set!"), _T(""), 0);
    }
    else
        MessageBox(NULL, _T("Image has been set!"), _T(""), 0);

    "Image has been set!" is displayed each time I run the app. Anyway,
many thanks in advance for any help!

Nick.

"NickP" <a@a.com> wrote in message
news:eX0oCAopGHA.4188@TK2MSFTNGP04.phx.gbl...

Hi there,

   For some reason I cannot seem to find any information on this method in
the VS.NET 2005 documentation. I am currently having problems drawing a
bitmap to a DC and most examples on the net that I come across suggest
using the SelectObject method of a CDC object. My CDC object doesn't even
have a SelectObject method, so I must have something different...

if(m_bitmap!=NULL)
{
   CSize pSizSize;
   m_bitmap.GetSize(pSizSize);

   CDC pCDCBitmap;
   pCDCBitmap.CreateCompatibleDC(dc);
   CBitmap pBmpBitmap = pCDCBitmap.SelectBitmap(m_bitmap);

   dc.BitBlt(rc.left, rc.top, pSizSize.cx, pSizSize.cy, pCDCBitmap, 0, 0,
SRCCOPY);

   pCDCBitmap.SelectBitmap(pBmpBitmap);
   pCDCBitmap.DeleteDC();
}

   My code is very simple at the moment, but the bitmap is not appearing.
I have tried calling the global SelectObject method but this produces the
same result. The image has definitely been initialised in m_bitmap, and
the BitBlt method is reached. Any ideas on what I could be doing wrongly?

Nick.

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