system() function

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strcpy()

Joined: 23 Aug 2006
Posts: 5
Location: Mar del Plata / Argentina

strcpy() 28 Sep 2006, 18:22

Hi all!

i want to use the C´s system() function but in FASM
is there some way, using the WINAPI or something ?

thanks!

28 Sep 2006, 18:22

Tommy

Joined: 17 Jun 2003
Posts: 489
Location: Norway

Tommy 28 Sep 2006, 19:21

i guess it's accessible through the msvcrt.dll

28 Sep 2006, 19:21

OzzY

Joined: 19 Sep 2003
Posts: 1029
Location: Everywhere

OzzY 28 Sep 2006, 19:33

Code:

include '%fasminc%\win32a.inc'
format PE GUI 4.0

main:
        invoke _system,progname
        invoke ExitProcess,0

;data
progname db 'notepad.exe',0

data import
library crt,'msvcrt.dll',\
kernel32,'kernel32.dll'


import crt, _system,'system'
import kernel32,ExitProcess,'ExitProcess'
end data

This should work.

28 Sep 2006, 19:33

f0dder

Joined: 19 Feb 2004
Posts: 3175
Location: Denmark

f0dder 28 Sep 2006, 21:57

Or use CreateProcess instead of depending on msvcrt.dll. Or ShellExecute, if your needs are simple.

28 Sep 2006, 21:57

LocoDelAssembly
Your code has a bug

Joined: 06 May 2005
Posts: 4624
Location: Argentina

LocoDelAssembly 28 Sep 2006, 23:43

And even more simple WinExec (not recomended by Microsoft but this worked for me on WinXP 64-bit Very Happy

Code:

include 'win32axp.inc'

.code

start:
  invoke  WinExec,\
          "notepad.exe test.asm",\   ; address of command line
          SW_SHOWNORMAL    ; window style for new application
  invoke  ExitProcess, 0

.end start

My source is named "test.asm" so when I press F9 on FASMW I get a notepad with the source code of the program that opened it Razz

28 Sep 2006, 23:43

Vasilev Vjacheslav

Joined: 11 Aug 2004
Posts: 392

Vasilev Vjacheslav 29 Sep 2006, 04:36

also ShellExecute

29 Sep 2006, 04:36

LocoDelAssembly
Your code has a bug

Joined: 06 May 2005
Posts: 4624
Location: Argentina

LocoDelAssembly 29 Sep 2006, 13:43

If ShellExecute runs synchronously then is the prefered, otherwise I think it's better CreateProcess with a wait-for-terminate code. WinExec returns control at the first GetMessage call of the program passed to WinExec (but the program still alive and doesn't finished its work).

The wait-for-terminate code is something around CreateProcess, OpenProcess and WaitForSingleObject.

29 Sep 2006, 13:43

f0dder

Joined: 19 Feb 2004
Posts: 3175
Location: Denmark

f0dder 29 Sep 2006, 13:55

Indeed, locodelassembly. And don't forget CloseHandle*2 Smile

29 Sep 2006, 13:55

LocoDelAssembly
Your code has a bug

Joined: 06 May 2005
Posts: 4624
Location: Argentina

LocoDelAssembly 29 Sep 2006, 13:58

oooh, good advice Smile

29 Sep 2006, 13:58

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