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Tip of the Day
Language: VB4/32,VB5,VB6
Expertise: Intermediate
Oct 13, 2001



Application Security Testing: An Integral Part of DevOps

Get the exit code of a process

In a few cases, in particular when running MsDos batch files from within a VB application, you may want to determine the ERRORLEVEL set by an external application. You can't do it with a plain Shell statement, but the job becomes easy with the support of the GetProcessExitCode API function:

Private Declare Sub Sleep Lib "kernel32" (ByVal dwMilliseconds 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 GetExitCodeProcess Lib "kernel32" (ByVal hProcess As _
    Long, lpExitCode As Long) As Long
Const STILL_ACTIVE = &H103

Private Sub cmdRunNotepad_Click()
    Dim hTask As Long
    Dim hProcess As Long
    Dim exitCode As Long
    hTask = Shell("Notepad", vbNormalFocus)
    hProcess = OpenProcess(PROCESS_QUERY_INFORMATION, False, hTask)
    ' loop until the process returns a valid exit code
        ' relinquish this CPU time slice
        Sleep 100
        ' query for exit code
        GetExitCodeProcess hProcess, exitCode
    Loop While exitCode = STILL_ACTIVE
    MsgBox "Exit code = " & exitCode, vbInformation
End Sub
Francesco Balena
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