Printing on many different printers

[shankle]

The program I wrote draws lines and has different sized fonts and prints only
in black and white. I used the pertinent Windows APIs and wrote the program
in MASM32 and tested it using Windows XP and Vista. It was tested on an HP
L7580 and works just fine on that printer.
Others with photo printers have no luck printing from the program. Also the cheap
brands also either squeeze the print to 1 quarter of the intended size or enlarge it
so that only 1 quarter of the data is printed per page.
I have been scratching my head on this problem for over a year and still don't
have a solution.
Hope someone can point me in the right direction.
Thanks