Drawing a resource bmp to a printer

[guest]

I want to draw a bitmap held as a resource in the exe to a printer. The help file implies I only need do the following but it doesn't work. Am I missing something?

hbmp = ISLoadResourceBitmap(hinst,"IDB_BETA",NULL);
ISDrawHBITMAP(hdcPrt,hbmp,10,10,50,50,NULL);

thanks for any help.

[Chris]

>I want to draw a bitmap held as a resource in the exe to a printer.
>The help file implies I only need do the following but it doesn't
>work.

what happens?
is the HBITMAP valid?
can the printer handle BitBlt?

try calling IS3GetLastError after each call.


--
chris losinger
smallest@smalleranimals.com

[guest]

Chris,
calling ISGetLastError I get:

0 after ISLoadResourceBitmap and the handle is not null
37 after ISDrawHBITMAP

then GetDeviceCaps(hDC,RASTERCAPS); returns 28313 which ANDs with RC_BITBLT to indicate it should be ok.

Dave

[Chris]

>37 after ISDrawHBITMAP

how big is that bitmap?

the IS3DrawHBITMAP function works like this:

1. create a memory-based DC based on the DC you passed in
2. call ::SelectObject to select the HBITMAP you passed in into that memory-DC
3. BitBlt from the memory-DC to the output DC
4. de-select your HBITMAP from the memory DC

the IS_ERR_SELECTOBJ error happens when step 2 fails.

here's the code (it's just the standard BitBlt operation that you can find anywhere) :

   if (hBmp==NULL) 
   {
      m_error=IS_ERR_BADPARAM;
      return FALSE;
   }
   
   int iCaps = ::GetDeviceCaps(outDC, RASTERCAPS);
   if ((iCaps & RC_BITBLT) != RC_BITBLT)
   {
      m_error=IS_ERR_NODEVOP;
      return FALSE;
   }
   
   // select our palette - on 16 and 24-bit displays, palettes have no effect.
   if (hPal==NULL)
      hPal = (HPALETTE) GetStockObject(DEFAULT_PALETTE);
   
   HPALETTE hOldPal;
   hOldPal = ::SelectPalette(outDC, hPal, FALSE);
   ::RealizePalette(outDC);
   
   // create a DC to select our HBITMAP into
   HDC hMemDC;
   hMemDC = ::CreateCompatibleDC(outDC);
   if (hMemDC==NULL) 
   {
      m_error=IS_ERR_DC;
      ::SelectPalette(outDC, hOldPal, FALSE);
      return FALSE;
   }
   
   // let the memDC play, too
   SelectPalette(hMemDC, hPal, FALSE);
   
   // select HBITMAP into our DC
   HBITMAP olh=(HBITMAP )::SelectObject(hMemDC,hBmp);
   if (olh==NULL)
   {
      m_error=IS_ERR_SELECTOBJ;
      ::SelectPalette(outDC, hOldPal, FALSE);
      ::DeleteDC(hMemDC);
      return FALSE;
   }

   // copy to screen
   if (!::BitBlt(outDC,
      xPos, yPos,
      outWidth, outHeight,
      hMemDC,
      srcXStart, srcYStart,
      SRCCOPY))
   {
      m_error = IS_ERR_BITBLT;
   }
   
   // clean up
   ::SelectPalette(outDC, hOldPal, FALSE);
   ::SelectObject(hMemDC,olh);
   ::DeleteDC(hMemDC);

you might try calling ::GetLastError (not IS3GetLastError) after the SelectObject call, to see if Windows can tell you anything else about what happened.

--
chris losinger
smallest@smalleranimals.com

[guest]

Chris,

I've tried your code and the problem is SelectObject. GetLastError returns 87 - Invalid Parameter. It's got me puzzled. The bitmap is only 70x17 pixels and was created in VS6 using Insert Bitmap in the resource editor.

Dave

[Chris]

is the resource named "IDB_BETA" (with quotes) or is IDB_BETA a numeric value?

as a test, i added a Bitmap resource to my test app by right-clicking the project's resource tree, choosing "Insert...", then selecting "Bitmap...", then "New...", browsing out and selecting a .BMP file. then i changed the resource name from IDB_BITMAP1 (the default, which is a numeric value) to "IDB_BITMAP1" (including the quotes).

then i ran this code, and it worked:

   CClientDC dc(this);
   HINSTANCE hisnt = AfxGetInstanceHandle();
   HBITMAP hbmp = ISLoadResourceBitmap(hisnt,"BITMAP1",NULL);
   ISDrawHBITMAP(dc.m_hDC,hbmp,10,10,50,50,NULL);
   DeleteObject(hbmp);

--
chris losinger
smallest@smalleranimals.com

[guest]

If you don't want to include the quotes then you can use the MAKEINTRESOURCE Macro to turn the value IDB_BETA, ex: MAKEINTRESOURCE(IDB_BETA), into the usable form for the GDI calls used by the ISLoadResourceBitmap function.

- Timothy

[guest]

Chris,
I used your code in a test app and it worked fine. But I still can't get it to work with a printer DC although I can TextOut ok to it. Thanks for looking at it.
cheers
Dave Risley