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Is a task running?

Posted on 1998-11-17
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Last Modified: 2010-05-03
From Program A, what is the best way to determine if Executable B is running prior to shelling B out.  The class and caption of Executable B are unknown.  All that is known about B is it's path and executable name.      
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Question by:jphalen
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TAD062998 earned 300 total points
ID: 1445309
This is the version for 95 ( not tested on 98 yet but it should work)
The version for NT requires an additional 'free' .dll (Psapi.dll)
If you need that code let me know.

Add the following to a .bas module :

Private Const TH32CS_SNAPPROCESS As Long = 2&
Private Const MAX_PATH           As Integer = 260

Private Type PROCESSENTRY32
    dwSize              As Long
    cntUsage            As Long
    th32ProcessID       As Long
    th32DefaultHeapID   As Long
    th32ModuleID        As Long
    cntThreads          As Long
    th32ParentProcessID As Long
    pcPriClassBase      As Long
    dwFlags             As Long
    szExeFile           As String * MAX_PATH
End Type

Private Declare Function CreateToolhelpSnapshot Lib "Kernel32" _
                Alias "CreateToolhelp32Snapshot" _
                (ByVal lFlags As Long, ByVal lProcessID As Long) As Long

Private Declare Function ProcessFirst Lib "Kernel32" _
                Alias "Process32First" _
                (ByVal hSnapshot As Long, uProcess As PROCESSENTRY32) As Long

Private Declare Function ProcessNext Lib "Kernel32" _
                Alias "Process32Next" _
                (ByVal hSnapshot As Long, uProcess As PROCESSENTRY32) As Long

Private Declare Sub CloseHandle Lib "Kernel32" _
                (ByVal hPass As Long)

Public Function IsAppRunning95(ByVal sApp As String) As Boolean

    Dim hSnapshot   As Long
    Dim lContinue   As Long
    Dim bFound      As Boolean
    Dim pe32        As PROCESSENTRY32
     
    hSnapshot = CreateToolhelpSnapshot(TH32CS_SNAPPROCESS, 0)
     
    pe32.dwSize = LenB(pe32)
     
    lContinue = ProcessFirst(hSnapshot, pe32)
    bFound = False
    Do
        If UCase(sApp) = UCase(Left(pe32.szExeFile, InStr(1, pe32.szExeFile, Chr$(0)) - 1)) Then
           bFound = True
           Exit Do
        End If

        lContinue = ProcessNext(hSnapshot, pe32)
    Loop While lContinue   ' If True, return 1
     
    If bFound = True Then
        IsAppRunning95 = True
    Else
        IsAppRunning95 = False
    End If
   
    Call CloseHandle(hSnapshot)

End Function

Then, in your application use :

    If IsAppRunning95("C:\Windows\MyApplication.exe") Then
        MsgBox "Yes"
    Else
        MsgBox "No"
    End If

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by:jphalen
ID: 1445310
If it is running, how would I get the handle so ShowWindow can be called?
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