Re: Pixel to inch

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#7712

From: Eelke
Date: Tue, 11 Jan 2005 07:46

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Bob Gonder wrote:
> Thomas J. wrote:
> 
> 
>>I want to print a bar code but  unfortunately the barcode API works with 
>>�nch or millimetre.
>>How can calculate from pixel to inch or millimetre?
>>
>>Thanks for your help 
> 
> 
> See	GetDeviceCaps()
> With the HORZRES  and the HORZSIZE  (or the Vert versions)
> 
> HORZSIZE = page width in mm.
> HORZRES = page width in pixels.
> 
> 	mm = GetDeviceCaps( hPrinter,HORZSIZE);
> 	pix =  GetDeviceCaps( hPrinter,HORZRES);
> 	pixpermm = pix / mm;
> 	pixperinch = (pix * 254) / (mm*10);
> 
Using LOGPIXELSX and LOGPIXELSY you will directly get the DPI value.

You can also use SetMapMode to change the coordinate system.

Eelke

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