Re: CDC::SelectBitmap method

From:

"NickP" <a@a.com>

Newsgroups:

microsoft.public.vc.language

Date:

Thu, 13 Jul 2006 15:09:15 +0100

Message-ID:

<unul1XopGHA.4368@TK2MSFTNGP05.phx.gbl>

Problem found!

It appears that the CBitmap object is falling out of scope and being
destroyed. It appears that I will need to shift some code around :-) At
least the problem is solved.

Nick.

"NickP" <a@a.com> wrote in message
news:u1EnMTopGHA.1592@TK2MSFTNGP04.phx.gbl...

Just to add some more, it also appears that the GetSize method is also
failing, yet another method I cannot find any documentation for in my MSDN
installation.. :-(

"NickP" <a@a.com> wrote in message
news:%2389J1QopGHA.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.