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Tekl
Joined: 24 Sep 2004
Posts: 813
Location: Germany
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 Posted: Wed Jan 09, 2008 9:19 pm Post subject: DllCall and ShellExecuteA will crash sometimes a script |
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Hi,
it's really hard to explain and I can't reproduce it myself.
At my script ac'tivAid there's a function called AppLauncher which is similar to Rajats 320MPh. It is used to search through the start menu and quickly launch the selected item. It also can optionally launch the selected item with the RunAs command from ShellExecuteA of shell32.dll.
| Code: | | DllCall("shell32\ShellExecuteA", uint, 0, str, "RunAs", str, SelectedCommandOrShortcut, str, "" , str, WorkingDir, int, 1) |
Some users reported that after this DllCall the AutoHotkey may crash on simple Send commands assigned to a hotkey. It doesn't happen If DllCall is replaced with Run. I also created a helper script which just contains the DllCall which executes the Command specified in the command line. If I call this extra script instead of DllCall, everything is working ok.
What could be the Reason of this crash? Could it be that DllCall produces a memory hole or an overflow in rare situations?
It tried some things like LoadLibrary or Sleep, 0 after the DllCall or using a different thread with SetTimer, but the crash comes if DllCall has 'prepared' it.
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Tekl
Joined: 24 Sep 2004
Posts: 813
Location: Germany
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| Posted: Thu Jan 10, 2008 7:10 am Post subject: |
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Now a user reported that my simple helper script will also crash AutoHotkey if the runas dialog will be cancelled.
| Code: | #Notrayicon
#Persistent
Detecthiddenwindows, On
Command = %1%
ShellExecResult := DllCall("shell32\ShellExecuteA", uint, 0, str, "RunAs", str, Command,str, "", str, A_WorkingDir, int, 1) ; Last parameter: SW_SHOWNORMAL = 1
ExitApp, %ShellExecResult%
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The error message tells, that "read" could not operate to the memory: fehler_in_anwendung.png
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DerRaphael
Joined: 23 Nov 2007
Posts: 379
Location: Heidelberg, Germany
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| Posted: Thu Jan 10, 2008 10:41 am Post subject: |
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a quick google scan showed that runas combined with shellexec used in vista starts UAC [found here], but i didnt find any other informations ...
why dont you use the standard build in runas command from autohotkey instead?
if the dllcall is used for UAC, u might want to check os version and use standard autohotkey runas command if no vista found
greets
derRaphael
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Tekl
Joined: 24 Sep 2004
Posts: 813
Location: Germany
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| Posted: Thu Jan 10, 2008 10:50 am Post subject: |
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Yes I use it for UAC, but also to ask for the User in XP. The RunAs command does not work as I don't know the admin name and password and I don't want handle with passwords in the script itself.
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DerRaphael
Joined: 23 Nov 2007
Posts: 379
Location: Heidelberg, Germany
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| Posted: Thu Jan 10, 2008 11:21 am Post subject: |
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running win2k and cant provoke any error here even with malforming the script parameter such as
| Code: |
ShellExecResult := DllCall("shell32\ShellExecuteA"
, uint, 0
, str, "RunAs"
, str, "cmd.exe /?"
, str, ""
, str, A_WorkingDir
, int, 1)
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in this case its simply not working ... thus setting value to 2
are any command parameter used and how are these passed?
sorry
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MsgBox, 64, Forum Hint, It's a good idea to sign up and/or login to post in forum!
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Send, %Request%
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Tekl
Joined: 24 Sep 2004
Posts: 813
Location: Germany
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| Posted: Thu Jan 10, 2008 11:31 am Post subject: |
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I also can't reproduce it myself. There are no command line parameters used and most time there will be shurtcuts (lnk-Files) executed with RunAs.
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