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Checking For a Process

written by Mark Rowlinson - Last updated Mar 2005

 
Const TH32CS_SNAPHEAPLIST = &H1 
Const TH32CS_SNAPPROCESS = &H2 
Const TH32CS_SNAPTHREAD = &H4 
Const TH32CS_SNAPMODULE = &H8 
Const TH32CS_SNAPALL = (TH32CS_SNAPHEAPLIST Or TH32CS_SNAPPROCESS Or TH32CS_SNAPTHREAD Or TH32CS_SNAPMODULE) 
Const TH32CS_INHERIT = &H80000000 
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 CreateToolhelp32Snapshot Lib "Kernel32" (ByVal lFlags As Long, ByVal lProcessID As Long) As Long 
Private Declare Function Process32First Lib "Kernel32" (ByVal hSnapShot As Long, uProcess As PROCESSENTRY32) As Long 
Private Declare Function Process32Next Lib "Kernel32" (ByVal hSnapShot As Long, uProcess As PROCESSENTRY32) As Long 
Private Declare Sub CloseHandle Lib "Kernel32" (ByVal hPass As Long) 
 
Function CheckProcess(strEXEName As String) As Boolean 
    Dim hSnapShot As Long, uProcess As PROCESSENTRY32, r As Long 
     'Takes a snapshot of the processes and the heaps, modules, and threads used by the processes
    hSnapShot = CreateToolhelp32Snapshot(TH32CS_SNAPALL, 0&) 
     'set the length of our ProcessEntry-type
    uProcess.dwSize = Len(uProcess) 
     'Retrieve information about the first process encountered in our system snapshot
    r = Process32First(hSnapShot, uProcess) 
     
    Do While r > 0 
        If LCase$(strEXEName) = _ 
        LCase$(Left$(uProcess.szExeFile, IIf(InStr(1, uProcess.szExeFile, Chr$(0)) > 0, InStr(1, uProcess.szExeFile, Chr$(0)) - 1, 0))) _ 
        Then CheckProcess = True 
         'Retrieve information about the next process recorded in our system snapshot
        r = Process32Next(hSnapShot, uProcess) 
    Loop 
     'close our snapshot handle
    CloseHandle hSnapShot 
End Function 
 

As with many API examples much of the credit has to be given to the creators of API Guide at http://www.mentalis.org