It does not really matter where you call it. I am guessing you are missing some directx stuff that file_for_screen needs to work.(Or maybe it's an engine bug, some other thing)

try updating to latest directx to see if that works.

(does the small test script i posted gives the same error?)

Yeah, I tested the small snippet you posted and it's the same, I'm going to download the lastest directx runtime and I'll post if it works.

It takes the screenshot now but it never opens the dialogbox for printing it =/

hmmm... the snippet i posted above works on all 3 computers here. I dont know if this is any related but you my try running your app as administrator in vista/win7.

there might be some problem linking the windows.h, I tested the program on my laptop and did work, thanks for everything.

thats my problem, too. i run my programm under winXP 32bit. can anyone help me??

ok, now it works for me. i changed "print" in "printto" and add the name of the printer, looks like this:

ShellExecute(0,"printto","printfile0.jpg","PDF","",1);

My first printer is a XPS Printer and thats not work with jpg.