Bitmap continued

From:

Ed <me@right.her>

Newsgroups:

microsoft.public.vc.mfc

Date:

Mon, 10 Jan 2011 15:05:54 -0500

Message-ID:

<IIGdnaXwFbsB-7bQnZ2dnUVZ_vednZ2d@giganews.com>

I am down to two errors during build...

   HBITMAP bmp = ::LoadImage(AfxGetInstanceHandle(), filename,
IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE | LR_SHARED);

error C2440: 'initializing' : cannot convert from 'void *' to 'struct
HBITMAP__ *'
Conversion from 'void*' to pointer to non-'void' requires an explicit cast
=====================================================================
   dc.FillSolidRect(&r, &br);

error C2664: 'void __thiscall CDC::FillSolidRect(const struct tagRECT
*,unsigned long)'
cannot convert parameter 2 from 'class CBrush *' to 'unsigned long'
This conversion requires a reinterpret_cast, a C-style cast or
function-style cast
=====================================================================

I still would like to know where the bitmap selection comes in.

void CShowBmp::OnPaint()
{
   CPaintDC dc(this);

   int filenumber;
// ... formulate filename here, based on the ID
// Example: Files are found in the project's executable directory
   CString t;
   LPTSTR p = t.GetBuffer(MAX_PATH);
   ::GetModuleFileName(NULL, p, MAX_PATH);
   p=_tcsrchr(p, _T('\\'));
   if(p == NULL)
   { /* not possible */
     ASSERT(FALSE);
     t.ReleaseBuffer();
     return;
   } /* not possible */
   ++p;
   *p = _T('\0');
   t.ReleaseBuffer();

   CString filename;
   filename.Format(_T("%s%02d.bmp"), filename, filenumber);

   HBITMAP bmp = ::LoadImage(AfxGetInstanceHandle(), filename,
IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE | LR_SHARED);

   // Depending on what I am doing, I might add LR_LOADMAP3DCOLORS or
LR_LOADTRANSPARENT
   if(bmp == NULL)
   { /* failed to load */
     CRect r;
     GetClientRect(&r);

     // Define an error brush. To make it invisible, you might use
     // a solid brush of ::GetSysColor(COLOR_3DFACE)
     // or a hatched brush
     // For a hatched brush, I might set a dark background color

     CBrush br(HS_DIAGCROSS, RGB(0,0,0));
     dc.SetBkColor(RGB(96, 96, 96));

     // This can be recognized as the indication of a failure

     dc.FillSolidRect(&r, &br);

     return;
   } /* failed to load */

   CBitmap bm;
   bm.Attach(bmp);
   BITMAP bmd;
   bm.GetBitmap(&bmd);

   CDC MemDC;
   MemDC.CreateCompatibleDC(&dc);

   int save = MemDC.SaveDC();
   MemDC.SelectObject(&bm);
   // I could use BitBlt or StretchBlt; I;m showing BitBlt below
   dc.BitBlt(0, 0, bmd.bmWidth, bmd.bmHeight, &MemDC, 0,0, SRCCOPY);
   MemDC.RestoreDC(save);
}