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Monitor an Application

Posted on 1998-11-09
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Last Modified: 2010-04-30
I am wanting to create an application that will watch another (not programmed by myself) windows application to make sure it is not terminated by the user.. is there a way to monitor another app and trap information about termination etc?? Any code would be helpful.

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Question by:gwaltersii
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mark2150 earned 50 total points
ID: 1444014
Can you spawn the child app? If so then you can write a simple "wrapper" program that loads, fires the child & suspends until the task terminates. If it does, then you can simply re-spawn it and repeat.

Put a Cancel in your programs Query_Unload event and the user will have a hard time killing your task. Set the properties of your project not to show in the task bar and the user may not even be aware you're there.

You can't use SHELL to spawn the child as this is an async process. You'll need the code to the ExecCmd function to fire the child as ExecCmd waits for the child to end before continuing.

Here is code:

'
' These data type declarations are required to support the obscure windows
' function to spawn a child task and wait for it to finish before continuing
'
Private Type STARTUPINFO
    cb As Long
    lpReserved As String
    lpDesktop As String
    lpTitle As String
    dwX As Long
    dwY As Long
    dwXSize As Long
    dwYSize As Long
    dwXCountChars As Long
    dwYCountChars As Long
    dwFillAttribute As Long
    dwFlags As Long
    wShowWindow As Integer
    cbReserved2 As Integer
    lpReserved2 As Long
    hStdInput As Long
    hStdOutput As Long
    hStdError As Long
End Type
'
Private Type PROCESS_INFORMATION
    hProcess As Long
    hThread As Long
    dwProcessID As Long
    dwThreadID As Long
End Type
'
Private Declare Function WaitForSingleObject Lib "kernel32" (ByVal hHandle As Long, _
    ByVal dwMilliseconds As Long) As Long
'
Private Declare Function CreateProcessA Lib "kernel32" ( _
    ByVal lpApplicationName As Long, _
    ByVal lpCommandLine As String, _
    ByVal lpProcessAttributes As Long, _
    ByVal lpThreadAttributes As Long, _
    ByVal bInheritHandles As Long, _
    ByVal dwCreationFlags As Long, _
    ByVal lpEnvironment As Long, _
    ByVal lpCurrentDirectory As Long, _
    lpStartupInfo As STARTUPINFO, _
    lpProcessInformation As PROCESS_INFORMATION) As Long
'
Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long
'
Const NORMAL_PRIORITY_CLASS = &H20&
Const INFINITE = -1&
'
' I don't really understand the above declares, but they do work so DON'T MESS WITH THEM!

Public Sub ExecCmd(cmdline$)
'
' This executes an external windows program and waits for it to complete
'
Dim proc As PROCESS_INFORMATION
Dim start As STARTUPINFO
'
' Initialize the STARTUPINFO structure:
'
start.cb = Len(start)
'
' Start the shelled application
'
ret& = CreateProcessA(0&, cmdline$, 0&, 0&, 1&, NORMAL_PRIORITY_CLASS, 0&, 0&, start, proc)
'
' Wait for the shelled application to finish:
'
holdhere:
    DoEvents
    ret& = WaitForSingleObject(proc.hProcess, 5000)
    If ret& <> 0 Then GoTo holdhere
'
ret& = CloseHandle(proc.hProcess)
End Sub

You have to explicity DIM the passed param to ExecCmd to STRING. The properties of the child control how/if it is displayed.

M

Basic program is:

DIM Cmd AS STRING
Cmd = "Myprog.exe"

Cycle:
ExecCmd( Cmd )
GOTO Cycle

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