CreateProcess+SW_HIDE fails.

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Overflowz

Joined: 03 Sep 2010
Posts: 1046

Overflowz 20 Jan 2012, 18:20

Hello everyone, I'm having trouble when calling CreateProcess with SW_HIDE option. It does work on some apps, but not on everything. I've tried it on calc.exe and seems it is ignoring this parameter. Is there any way to do it without using ShowWindow API ? I'm initializing structure like this:

Code:

sinfo STARTUPINFO
pinfo PROCESS_INFORMATION
mov [sinfo.cb],sizeof.STARTUPINFO
mov [sinfo.dwFlags],STARTF_USESHOWWINDOW
mov [sinfo.wShowWindow],SW_HIDE
invoke CreateProcess,0,"calc.exe",0,0,0,0,0,0,sinfo,pinfo
invoke ExitProcess,0

Thank you.

20 Jan 2012, 18:20

Yardman

Joined: 12 Apr 2005
Posts: 244
Location: US

Yardman 20 Jan 2012, 21:46

[ Post removed by author. ]

Last edited by Yardman on 04 Apr 2012, 04:50; edited 1 time in total

20 Jan 2012, 21:46

Overflowz

Joined: 03 Sep 2010
Posts: 1046

Overflowz 20 Jan 2012, 21:59

So, without ShowWindow, there's no way to do it ? Sad

20 Jan 2012, 21:59

AsmGuru62

Joined: 28 Jan 2004
Posts: 1657
Location: Toronto, Canada

AsmGuru62 20 Jan 2012, 22:57

To be safe - I would have set all bytes in STARTUPINFO to zero, since there are some reserved values that must be NULL:

http://msdn.microsoft.com/en-us/library/ms686331(v=vs.85).aspx

It is also possible that some apps do not respect the hiding flag - why would someone start the CALC.EXE in hidden form?
They want to work with it right away.

Smile

20 Jan 2012, 22:57

Yardman

Joined: 12 Apr 2005
Posts: 244
Location: US

Yardman 20 Jan 2012, 22:58

[ Post removed by author. ]

Last edited by Yardman on 04 Apr 2012, 04:50; edited 1 time in total

20 Jan 2012, 22:58

Overflowz

Joined: 03 Sep 2010
Posts: 1046

Overflowz 21 Jan 2012, 08:36

AsmGuru62
I was doing that, just forget to write it sorry Smile

Yardman
What do you mean with CREATE_SUSPENDED ? What are you suggesting ? ^^
--
I don't want someone to hide "calc.exe" from them, just trying to find a way how to hide the app which not accepts nCmdShow parameter Smile

21 Jan 2012, 08:36

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