Starting/Controll a shell process..

[Tyrone W. Lee]

I am aware of how to start a shell in VB and use the CreatProcessA
command to determine when a shell is comple. Could someone
explain in more detail the STARTUPINFO type and how to start
a process "Minimized"?

I noticed there is a wShowWindow variable within this type but without
an explanation of the type structure and its uses, I am kinda
lost...



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Explorations v3.0 RPG Development System
http://www.explore-rpg.com

[Semen Matusovski]

In my opinion, MSDN explains this very clear. But anyway

     #Compile Exe
     #Dim All
     #Register None
     #Include "WIN32API.INC"

     $CmdLine = "notepad.exe"

     Function PbMain
         Dim PI As PROCESS_INFORMATION
         Dim SI As STARTUPINFO

         SI.cb = SizeOf(SI)
         SI.dwFlags = %STARTF_USESHOWWINDOW
         SI.wShowWindow = %SW_MINIMIZE

         MsgBox "Minimized. Click Ok and see taskbar"
         
         CreateProcess ByVal 0&, $cmdline, ByVal 0&, ByVal 0&, ByVal 1&, _
           %NORMAL_PRIORITY_CLASS, ByVal 0&, ByVal 0&, SI, PI
         If PI.hProcess Then WaitForSingleObject PI.hProcess, %INFINITE: _
            CloseHandle PI.hProcess
            
         SI.wShowWindow = %SW_MAXIMIZE

         MsgBox "Maximized"

         CreateProcess ByVal 0&, $cmdline, ByVal 0&, ByVal 0&, ByVal 1&, _
           %NORMAL_PRIORITY_CLASS, ByVal 0&, ByVal 0&, SI, PI
         If PI.hProcess Then WaitForSingleObject PI.hProcess, %INFINITE: _
            CloseHandle PI.hProcess
         
         MsgBox "Finished"

   End Function

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E-MAIL: [email protected]

[Bern Ertl]

The PB SHELL function & statement have a style parameter.
Use 2 or 6 for minimized (or 0 for hidden).



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Bernard Ertl

[Tom Hanlin]

If you use CreateProcess, don't forget to CloseHandle PI.hThread also.

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Tom Hanlin
PowerBASIC Staff

[Semen Matusovski]

Tom --
CloseHandle PI.hThread returns non-zero and it looks that it's necessary to do it.
But I am curious, what happends, if do not CloseHandle finished process/thread.
Memory leaks only or something worse ?


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E-MAIL: [email protected]

[Tom Hanlin]

Nothing worse than a leak, as far as I know. But, no value in leaking!

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Tom Hanlin
PowerBASIC Staff

[Charles K. Kincaid]

Do you close the thread before the process or after?


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ATB

Charles Kincaid

[Tom Hanlin]

You can close the process and/or thread handles as soon as you don't need them any more.
If you don't use them, you can close them immediately when CreateProcess returns.


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Tom Hanlin
PowerBASIC Staff