OpenEuphoria

2. Re: Printing Bitmaps <rewind>

• Posted by Euman <euman at bellsouth.net> Jun 19, 2001
• 594 views

I guess it doesnt make much difference to do this.

if length(getPrinter()) > 0 then
 
   result = w32Func(xGetDeviceCaps, { getDC(Printer), RASTERCAPS } )

   if and_bits(RC_STRETCHBLT, result) then
   else puts(2,"Cant print Grachic")
   end if


Euman
euman at bellsouth.net


> Hello all,
> 
> GetDeviceCaps question and why testing to see if
> a printer is capable of printing raster graphics.
> 
> below is a list of the constants associated with
> Raster in Windows:
> 
> constant
>   RASTERCAPS = 38,
>   RC_BANDING = 2,
>   RC_BITBLT = 1,
>   RC_BITMAP64 = 8,
>   RC_DI_BITMAP = 128,
>   RC_DIBTODEV = 512,
>   RC_FLOODFILL = 4096,
>   RC_GDI20_OUTPUT = 16,
>   RC_PALETTE = 256,
>   RC_SCALING = 4,
>   RC_STRETCHBLT = 2048,
>   RC_STRETCHDIB = 8192,
>   RC_DEVBITS =  #8000,
>   RC_OP_DX_OUTPUT =  #4000,
> 
> retval = c_func(GetDeviceCaps,{prntHDC, RASTERCAPS})
> 
> here it is in C
> 
> if ( ! (GetDeviceCaps(printdlg.hDC, RASTERCAPS)
>       & RC_STRETCHBLT))
> {
>   MessageBox(hwnd, "Cant Print Raster Image",
>                         "Error", MB_OK);
>    return;
> }
> 
> retval is a single integer, how do I distinguish
> whether or not a particular function is possible
> from that retval?
> 
> Here is the Catch:
> 
> RASTERCAPS = 38,   <--- Not a power of 2
> 
> All the other constants are powers of 2, so in binary
> they have a single 1-bit somewhere.
> 
> RC_STRETCHBLT = 2048    -- a power of two
> 
> RASTERCAPS = 32 + 4 + 2
> so it has 3 separate 1-bits and none correspond to 2048,
> so it doesn't make much sense to me.
> Maybe RASTERCAPS is not correct.
> 
> Anyone with an idea?
> 
> Euman
> euman at bellsouth.net
> 
> 
> 
> 
<snip>