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Opened an external app using the shell command how do I close it?

Posted on 2004-03-28
Medium Priority
Last Modified: 2010-05-01
Can I close another external app from VB. I use the shell command to open it.
Question by:Sparky191
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Assisted Solution

xassets earned 200 total points
ID: 10698377
Use the FindWindow API function to get its hWND

Then send it a WM_CLOSE message using the SendMessage or PostMessage API Function
LVL 48

Assisted Solution

AlexFM earned 200 total points
ID: 10698396

Expert Comment

ID: 10698402
Yeah thats a bit more up to date.

Accepted Solution

___XXX_X_XXX___ earned 600 total points
ID: 10698515
Shell returns to you process ID for created process. You can use this PID later in TerminateProcess to terminate program.

Like this:

In declarations section of your form:

Dim mlngPID As Long
Private Declare Function OpenProcess Lib "kernel32" (ByVal dwDesiredAccess As Long, ByVal bInheritHandle As Long, ByVal dwProcessId As Long) As Long
Private Declare Function TerminateProcess Lib "kernel32" (ByVal hProcess As Long, ByVal uExitCode As Long) As Long

 ' Add two command buttons - Command1 for start Calculator and Command2 for Terminating it.
Private Sub Command1_Click()
mlngPID = Shell("calc.exe")
End Sub

Private Sub Command2_Click()
Dim lngProcess As Long
lngProcess = OpenProcess(PROCESS_ALL_ACCESS, 0&, mlngPID)
TerminateProcess lngProcess, 0&
End Sub

Start project, press Command1 - calculator must show, then press command2 - calculator will be terminated.


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