Are windows HDC and printers HDC not supposed to work identically?

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The display program that I used to render to a window dc was used by me to write to PriPrinter a virtual printing software. Everything worked fine except that the images were rendered to true size and not according to specified size. Is it because it is a software or is it typical of printers to function like that?

What I have tried:

I have been trying to resolve this all day

Posted 6-Apr-24 8:15am

Gbenbam

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Richard MacCutchan 7-Apr-24 3:15am

Without seeing your code it is impossible to guess.

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Pete O'Hanlon · Accepted Answer · 2024-04-06T23:22:00

Solution 1

The problem you're describing is resolution. Typically, printers support a much higher resolution than a screen does, so if you have made assumptions about DPI, for instance, you will see a different output.

It's best to work with Device Independent Pixels, as described here[^].

Posted 6-Apr-24 23:22pm

Pete O'Hanlon

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CPallini 8-Apr-24 2:02am

5.

Pete O'Hanlon 8-Apr-24 4:13am

Thanks.

Gbenbam 22-Apr-24 17:30pm

Your solution and link are quite revealing. I would like to know how to convert Device independent pixels
to millimeters. This is because the first thing my application does is to find the value of a millimeter in pixels ( by using GetDeviceCapps to get size of the screen in pixels then in millimetres and using the two values to calculate the value of a millimeter in pixels. All lengths are then given in terms of the calculated one-millimeter-pixels.)