Re: [Dev-C++] Loading a bitmap and getting its handle ???

[<A_B...@gm...>]

@Gerson Lara:
Well, for the window this is OK...
But not for the bitmap... It's a little bit more complicated, but you wher=
e on the right way...  ;))

Meanwhile I solved the problem:

HBITMAP hbm =3D (HBITMAP)LoadImage( .... );
HDC hdcTarget =3D GetDC( hwndTargetWindow );
HDC hdcBitmap =3D CreateCompatibleDC( hdcTarget );
HBITMAP hbmOld =3D (HBITMAP)SelectObject( hdcBitmap, hbm );
BitBlt( hdcTarget, ...., hdcBitmap, ... , SRCCOPY );
// cleanup
SelectObject( hdcBitmap, hbmOld );
DeleteDC( hdcBitmap );
ReleaseDC( hdcTarget ); 


Thanks for all responses !!!!!!!!!!!!!



Am 14 Jan 2005 um 21:08 hat Gerson Lara geschrieben:
> 
> Hello.
> As far as I know. there is no problem with making casts between Handles,=
 put, they are not just 
> pointers, I think there is some struct involved. So I recomend, not the =
simple casting, but the use of 
> other API's functions. For example:
> HDC GetDC(HWND);
> instead of (HDC)hnd_Window, do this:
>  HDC hdc =3D GetDC(hnd_Window); and use it in the call to BitBlt.
>  
> In the case of the bitmap, try using HBITMAP instead of a HANDLE, I thin=
k a Handle is more like a 
> long integer o somethig like that... I'm no sure about this.
> But I'm sure thet HBITMAP corresponds to "HANDLE to BITMAP", son you'll =
be able to use it 
> without casting in the call to BitBlt.
> Your code may look like this:
> void wndAnfang::drawSchein(){
>  HWND hnd_Window;
>  HBITMAP hnd_BMP;
>  
>  if(hnd_Window =3D FindWindow("fltk", "AB-Sys")){
>  if(hnd_BMP =3D LoadImage(NULL, "F:\\Sources\\DevCpp\\Sys\\out\\Schein-S=
mall.bmp", 
> IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE)){
>  HDC hdc =3D GetDC(hnd_Window);
>  
>  bool b =3D BitBlt(hdc, 0, 0, 300, 300, hnd_BMP, 0, 0, SRCCOPY);
>  DeleteObject(hnd_BMP);
>  ReleaseDC(hdc, hnd_Window);// this is important, only one trhead can ha=
ve the DC of a window
>  // I'm not sure about the second parameter, but I'm sure about the name=
 of the function.
>  
>  message("%d %d %d",b,hnd_Picture,hnd_Schein); 
>  } 
>  } 
> }
> I hope this may Help.I'm working at this time with bitmaps an that stuff=
, but I'm no expert, so 
> please, keep me up to date about your proyect, I can learn from you and =
I'm willing to help you.
> Gerson.
> 
> A_B...@gm... wrote:
>     Thank you for the hint !!! :)
> But now I have an other problem...
> I get two different types of handles (HWND and HANDLE).
> BitBlt needs for source and destination the handle type HDC.
> So the only way to get this code to run seems to cast the two handles to=
 HDC.
> But BitBlt returns False and nothing is drawn to the window!
> 
> 
> void wndAnfang::drawSchein(){
>  HWND hnd_Window;
>  HANDLE hnd_BMP;
>  
>  if(hnd_Window =3D FindWindow("fltk", "AB-Sys")){
>  if(hnd_BMP =3D LoadImage(NULL, "F:\\Sources\\DevCpp\\Sys\\out\\Schein-S=
mall.bmp", 
> IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE)){
>  
>  bool b =3D BitBlt((HDC)hnd_Window, 0, 0, 300, 300, (HDC)hnd_BMP, 0, 0, =
SRCCOPY);
> 
>  DeleteObject(hnd_BMP);
>  
>  message("%d %d %d",b,hnd_Picture,hnd_Schein); 
>  } 
>  } 
> }
> 
> 
> 
> 
> Am 10 Jan 2005 um 13:51 hat OROSZI Bal=E1zs geschrieben:
> > 
> > If you want to load a bitmap from a file (.bmp), then you have to look=
 
> > for an image library or write your own loader, as the Win32 API doesn'=
t 
> > support loading bitmaps from files directly.
> > 
> > It can load bitmaps from resources though. See LoadBitmap() for detail=
s.
> > 
> > --
> > Greetings,
> > Bal=E1zs
> 
> 
> 
> Nuevo Correo Yahoo!
> 
>