Author Topic: call _printf  (Read 3047 times)

nobody

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call _printf
« on: September 16, 2009, 03:16:35 AM »
I use NASM under Windows,and in my asm I want to call C runtime function printf, like this

'push msg

call _printf

add esp, 4`


But when program run, it does not call printf function but another fuction.If code like this:

push msg

mov eax, _printf

call eax

add esp, 4

It works well.Why?

Thanks!

Offline Frank Kotler

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Re: call _printf
« Reply #1 on: September 16, 2009, 11:47:16 PM »
Dunno. Doesn't seem possible. What function does it call besides _printf?

Best,
Frank

nobody

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Re: call _printf
« Reply #2 on: September 17, 2009, 01:32:33 AM »
The function is not confirmed.But it is not printf.

BTW,my NASM is 2.04.

Thanks!

Offline Frank Kotler

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Re: call _printf
« Reply #3 on: September 17, 2009, 03:57:00 PM »
Odd. Well, put it in eax, if that works. Shouldn't make any difference. Are you using "-f obj"? If so, "call [_printf]" may work...

Best,
Frank