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How can I tell if my program was run from other program (Shell command)?

Posted on 2009-04-01
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Last Modified: 2012-05-06
I have a vb6 program that calls another program vb5.  I want the vb5 program to only execute if it was called from the first one.  How can I test if it was called from the first vb6 program?.  If another command is better than the Shell I will use it.
If the user tries to execute the vb5 program I do not want it to work, Thank You
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Question by:GarySB
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Expert Comment

by:Mike Tomlinson
ID: 24041781
Pass in a "secret" command line parameter when you launch VB5 from VB6.  If the command line parameter is not present then exit out...

See Command: http://msdn.microsoft.com/en-us/library/aa262696.aspx
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Author Comment

by:GarySB
ID: 24041850
Can I also end the vb6 program somehow? or will that just happen?  One other question. How can I stop the vb6 from executing the line following the Shell command.  It keeps going forward so now two programs are running and i may need to wait for a result to decide if I want to keep going with the vb6 program, Thank You.
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Expert Comment

by:Mike Tomlinson
ID: 24043370
"...and i may need to wait for a result to decide if I want to keep going with the vb6 program"

You need a "shell and wait" function.:
(there are LOTS of different ways to do this)
Option Explicit
 

Private Declare Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As Long)
 

Private Function ShellAndWait(ByVal fileName As String) As Long

    If Dir(fileName) <> "" Then

        Dim WShell As Object

        Dim oProcess As Object

        

        Set WShell = CreateObject("WScript.Shell")

        Set oProcess = WShell.Exec(fileName)
 

        Do While oProcess.Status = 0

            Sleep 50 ' keep CPU usage from ramping to 100%

            DoEvents ' keep app responsive

        Loop
 

        ShellAndWait = oProcess.ExitCode
 

        Set WShell = Nothing

        Set oProcess = Nothing

    Else

        MsgBox fileName, vbCritical, "File Not Found"

        ShellAndWait = 1 ' a non-zero value usually means something went wrong

    End If

End Function

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Author Comment

by:GarySB
ID: 24046173
Looks very good.  Cannot try until tomorrow night. Will let you know, Thank You
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Author Comment

by:GarySB
ID: 24071340
This is the last section that I need in order for my code to work.  Can you please correct my code.  I am unable to get the right syntax between the two programs.  I've increased the points to 500 and will issue them today for you,  I appreciate your help, Thank You

VB6 Program:
     (not sure if this is correct because I am unable to see the MyVariable value in the VB5Prog program)
     Shell (App.Path & "\" & "VB5Prog.exe cmd/MyVariable")

VB5 Program:
(not sure how MyVariable is received)
StartUp Procedure
     If MyVariable = "" then End ?
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Mike Tomlinson earned 500 total points
ID: 24071707
That is what the first link was for, though I'm not actually sure it's available in VB5.

Try this in the VB5 program:
    (Startup Procedure)
    MyVariable = Command
    MsgBox MyVariable ' <--- what do you get here?
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Author Closing Comment

by:GarySB
ID: 31565394
Idle_Mind, Thank you so much.
It gives exactly what you put there.
If you place myprogram.exe cmd/MyVariable
it prints cmd/MyVariable  It does not print the contents of the variable.
You do not even seem to need cmd. If I place Gary after the .exe it prints Gary in the VB5 program.  Again this is just what I needed, Thank you for getting back to me on the weekend.
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