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Look at the GetDeviceCaps API function. The LogPixelsX and
LogPixelsY return the number of pixels per inch. In my case it is
for printing, but I think it works for any "device".
1440 / the number of pixels per inch gives you the twips per
pixel.
Use GetDeviceCaps to get the pixel resolution. Let's say 600 for
example.
1440 / 600 = 2.4 twips per pixel
720 twips = 300 pixels (720 / 2.4)
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