Find full path to EXE file from process information

This sample from MS will list the full path in Win98 and above...

How To List Running Processes
http://support.microsoft.com/default.aspx?scid=kb;en-us;187913

Try this

Option Explicit

Private Sub Command1_Click()

    Dim objWMIService As Object
    Dim colProcesses As Object
    Dim objProcess As Object
   
    On Error Resume Next
    Set objWMIService = GetObject("winmgmts:")
    Set colProcesses = objWMIService.ExecQuery("Select * from Win32_Process")
    For Each objProcess In colProcesses
        Debug.Print objProcess.Caption, objProcess.executablepath
    Next

End Sub

mladenovicz:

    Your solution sems to be the best, although there are some problems.
1) It appears to require that I provide an Exe name, then it finds the path. As I understand it, the program must be running for it to do this, because it refers to the process. Is this right? That could work for me. I could use the old sytem to get the Exe name, then call your code to get the full path if the OS is NT based, like XP.
2) I found that some EXE's I tried it with did not work (no result), even though they were clearly running (they came up in my old code). Any idea why? csrss.exe is one exmple. It is some kind of system file, found in C:\Windows\system32. alg.exe is another.

3) Some come up twice. svchost.exe is one of them. Any idea why?

Try this

'In a form
Private Sub Form_Load()
    'Code submitted by Roger Taylor
    'enumerate all the different explorer.exe processes
    GetProcesses
End Sub

Public Declare Function GetProcessMemoryInfo Lib "PSAPI.DLL" (ByVal hProcess As Long, ppsmemCounters As PROCESS_MEMORY_COUNTERS, ByVal cb As Long) As Long
Public Declare Function Process32First Lib "kernel32" (ByVal hSnapshot As Long, lppe As PROCESSENTRY32) As Long
Public Declare Function Process32Next Lib "kernel32" (ByVal hSnapshot As Long, lppe As PROCESSENTRY32) As Long
Public Declare Function CloseHandle Lib "Kernel32.dll" (ByVal Handle As Long) As Long
Public Declare Function OpenProcess Lib "Kernel32.dll" (ByVal dwDesiredAccessas As Long, ByVal bInheritHandle As Long, ByVal dwProcId As Long) As Long
Public Declare Function EnumProcesses Lib "PSAPI.DLL" (ByRef lpidProcess As Long, ByVal cb As Long, ByRef cbNeeded As Long) As Long
Public Declare Function GetModuleFileNameExA Lib "PSAPI.DLL" (ByVal hProcess As Long, ByVal hModule As Long, ByVal ModuleName As String, ByVal nSize As Long) As Long
Public Declare Function EnumProcessModules Lib "PSAPI.DLL" (ByVal hProcess As Long, ByRef lphModule As Long, ByVal cb As Long, ByRef cbNeeded As Long) As Long
Public Declare Function CreateToolhelp32Snapshot Lib "kernel32" (ByVal dwFlags As Long, ByVal th32ProcessID As Long) As Long
Public Declare Function GetVersionExA Lib "kernel32" (lpVersionInformation As OSVERSIONINFO) As Integer
Public Declare Function SetTimer Lib "user32" (ByVal hwnd As Long, ByVal nIDEvent As Long, ByVal uElapse As Long, ByVal lpTimerFunc As Long) As Long
Public Declare Function KillTimer Lib "user32" (ByVal hwnd As Long, ByVal nIDEvent As Long) As Long
Public Declare Sub GlobalMemoryStatus Lib "kernel32" (lpBuffer As MEMORYSTATUS)



Public Const PROCESS_QUERY_INFORMATION = 1024
Public Const PROCESS_VM_READ = 16
Public Const MAX_PATH = 260
Public Const STANDARD_RIGHTS_REQUIRED = &HF0000
Public Const SYNCHRONIZE = &H100000
Public Const PROCESS_ALL_ACCESS = &H1F0FFF
Public Const TH32CS_SNAPPROCESS = &H2&
Public Const hNull = 0
Public Const WIN95_System_Found = 1
Public Const WINNT_System_Found = 2
Public Const Default_Log_Size = 10000000
Public Const Default_Log_Days = 0
Public Const SPECIFIC_RIGHTS_ALL = &HFFFF
Public Const STANDARD_RIGHTS_ALL = &H1F0000


Type MEMORYSTATUS
    dwLength As Long
    dwMemoryLoad As Long
    dwTotalPhys As Long
    dwAvailPhys As Long
    dwTotalPageFile As Long
    dwAvailPageFile As Long
    dwTotalVirtual As Long
    dwAvailVirtual As Long
End Type


Type PROCESS_MEMORY_COUNTERS
    cb As Long
    PageFaultCount As Long
    PeakWorkingSetSize As Long
    WorkingSetSize As Long
    QuotaPeakPagedPoolUsage As Long
    QuotaPagedPoolUsage As Long
    QuotaPeakNonPagedPoolUsage As Long
    QuotaNonPagedPoolUsage As Long
    PagefileUsage As Long
    PeakPagefileUsage As Long
End Type


Public Type PROCESSENTRY32
    dwSize As Long
    cntUsage As Long
    th32ProcessID As Long ' This process
    th32DefaultHeapID As Long
    th32ModuleID As Long ' Associated exe
    cntThreads As Long
    th32ParentProcessID As Long ' This process's parent process
    pcPriClassBase As Long ' Base priority of process threads
    dwFlags As Long
    szExeFile As String * 260 ' MAX_PATH
    End Type


Public Type OSVERSIONINFO
    dwOSVersionInfoSize As Long
    dwMajorVersion As Long
    dwMinorVersion As Long
    dwBuildNumber As Long
    dwPlatformId As Long '1 = Windows 95.
    '2 = Windows NT
    szCSDVersion As String * 128
End Type


Public Function GetProcesses()

    Dim booResult As Boolean
    Dim lngLength As Long
    Dim lngProcessID As Long
    Dim strProcessName As String
    Dim lngSnapHwnd As Long
    Dim udtProcEntry As PROCESSENTRY32
    Dim lngCBSize As Long 'Specifies the size, In bytes, of the lpidProcess array
    Dim lngCBSizeReturned As Long 'Receives the number of bytes returned
    Dim lngNumElements As Long
    Dim lngProcessIDs() As Long
    Dim lngCBSize2 As Long
    Dim lngModules(1 To 200) As Long
    Dim lngReturn As Long
    Dim strModuleName As String
    Dim lngSize As Long
    Dim lngHwndProcess As Long
    Dim lngLoop As Long
    Dim b As Long
    Dim c As Long
    Dim e As Long
    Dim d As Long
    Dim pmc As PROCESS_MEMORY_COUNTERS
    Dim lret As Long
    Dim strProcName2 As String
    Dim strProcName As String

    'Turn on Error handler
    On Error GoTo Error_handler

   booResult = False

    EXEName = UCase$(Trim$(EXEName))
    lngLength = Len(EXEName)

    'ProcessInfo.bolRunning = False

    Select Case getVersion()
        'I'm not bothered about windows 95/98 becasue this class probably wont be used on it anyway.
        Case WIN95_System_Found 'Windows 95/98

        Case WINNT_System_Found 'Windows NT

            lngCBSize = 8 ' Really needs To be 16, but Loop will increment prior to calling API
            lngCBSizeReturned = 96

            Do While lngCBSize <= lngCBSizeReturned
                DoEvents
                'Increment Size
                lngCBSize = lngCBSize * 2
                'Allocate Memory for Array
                ReDim lngProcessIDs(lngCBSize / 4) As Long
                'Get Process ID's
                lngReturn = EnumProcesses(lngProcessIDs(1), lngCBSize, lngCBSizeReturned)
            Loop

            'Count number of processes returned
            lngNumElements = lngCBSizeReturned / 4
            'Loop thru each process

            For lngLoop = 1 To lngNumElements
            DoEvents

            'Get a handle to the Process and Open
            lngHwndProcess = OpenProcess(PROCESS_QUERY_INFORMATION Or PROCESS_VM_READ, 0, lngProcessIDs(lngLoop))

            If lngHwndProcess <> 0 Then
                'Get an array of the module handles for the specified process
                lngReturn = EnumProcessModules(lngHwndProcess, lngModules(1), 200, lngCBSize2)

                'If the Module Array is retrieved, Get the ModuleFileName
                If lngReturn <> 0 Then

                    'Buffer with spaces first to allocate memory for byte array
                    strModuleName = Space(MAX_PATH)

                    'Must be set prior to calling API
                    lngSize = 500

                    'Get Process Name
                    lngReturn = GetModuleFileNameExA(lngHwndProcess, lngModules(1), strModuleName, lngSize)

                    'Remove trailing spaces
                    strProcessName = Left(strModuleName, lngReturn)

                    'Check for Matching Upper case result
                    strProcessName = UCase$(Trim$(strProcessName))

                    strProcName2 = GetElement(Trim(Replace(strProcessName, Chr$(0), "")), "\", 0, 0, GetNumElements(Trim(Replace(strProcessName, Chr$(0), "")), "\") - 1)

                    'If strProcName2 = EXEName Then

                        'Get the Site of the Memory Structure
                        pmc.cb = LenB(pmc)

                           lret = GetProcessMemoryInfo(lngHwndProcess, pmc, pmc.cb)

                            Debug.Print EXEName & "::" & CStr(pmc.WorkingSetSize / 1024)
                            Debug.Print "Path: " & strProcessName

                    'End If
                End If
            End If
            'Close the handle to this process
            lngReturn = CloseHandle(lngHwndProcess)
            DoEvents
        Next

    End Select

IsProcessRunning_Exit:

'Exit early to avoid error handler
Exit Function
Error_handler:
    Err.Raise Err, Err.Source, "ProcessInfo", Error
    Resume Next
End Function


Private Function getVersion() As Long

    Dim osinfo As OSVERSIONINFO
    Dim retvalue As Integer

    osinfo.dwOSVersionInfoSize = 148
    osinfo.szCSDVersion = Space$(128)
    retvalue = GetVersionExA(osinfo)
    getVersion = osinfo.dwPlatformId

End Function


Private Function StrZToStr(s As String) As String
    StrZToStr = Left$(s, Len(s) - 1)
End Function



Public Function GetElement(ByVal strList As String, ByVal strDelimiter As String, ByVal lngNumColumns As Long, ByVal lngRow As Long, ByVal lngColumn As Long) As String

    Dim lngCounter As Long

    ' Append delimiter text to the end of the list as a terminator.
    strList = strList & strDelimiter

    ' Calculate the offset for the item required based on the number of columns the list
    ' 'strList' has i.e. 'lngNumColumns' and from which row the element is to be
    ' selected i.e. 'lngRow'.
    lngColumn = IIf(lngRow = 0, lngColumn, (lngRow * lngNumColumns) + lngColumn)

    ' Search for the 'lngColumn' item from the list 'strList'.
    For lngCounter = 0 To lngColumn - 1

        ' Remove each item from the list.
        strList = Mid$(strList, InStr(strList, strDelimiter) + Len(strDelimiter), Len(strList))

        ' If list becomes empty before 'lngColumn' is found then just
        ' return an empty string.
        If Len(strList) = 0 Then
            GetElement = ""
            Exit Function
        End If

    Next lngCounter

    ' Return the sought list element.
    GetElement = Left$(strList, InStr(strList, strDelimiter) - 1)

End Function


''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
'Function GetNumElements (ByVal strList As String,
'                         ByVal strDelimiter As String)
'                         As Integer
'
'  strList      = The element list.
'  strDelimiter = The delimiter by which the elements in
'                 'strList' are seperated.
'
'  The function returns an integer which is the count of the
'  number of elements in 'strList'.
'
'  Author: Roger Taylor
'
'  Date:26/12/1998
'
'  Additional Information:
'
'  Revision History:
'
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

Public Function GetNumElements(ByVal strList As String, ByVal strDelimiter As String) As Integer

    Dim intElementCount As Integer

    ' If no elements in the list 'strList' then just return 0.
    If Len(strList) = 0 Then
        GetNumElements = 0
        Exit Function
    End If

    ' Append delimiter text to the end of the list as a terminator.
    strList = strList & strDelimiter

    ' Count the number of elements in 'strlist'
    While InStr(strList, strDelimiter) > 0
        intElementCount = intElementCount + 1
        strList = Mid$(strList, InStr(strList, strDelimiter) + 1, Len(strList))
    Wend

    ' Return the number of elements in 'strList'.
    GetNumElements = intElementCount

End Function

2. I am running Win XP and  csrss.exe is found
3.  svchost.exe comes up twice, because there are more than one instance, check task manager

<<2. I am running Win XP and  csrss.exe is found>>

    For some reason,it is just not showing on mine, even with the new code. I even checked to see if it was a hidden file or anything. Nope. Just no explanation I can see. I am providing a backup procedure in my program. If my original code says the process is running and your code does not find it, I do a simple disk search. There are two problems with the disk search: It takes a long time, and it has to check to make sure there are not two EXE files with that name. If there are two files, it does not do the delete for fear of getting the wrong one. Fortunately, your code does find the file path most of the time.

<<3.  svchost.exe comes up twice, because there are more than one instance, check task manager>>

    You are correct. I suspected it was something like that, I jsut did not get around to testing my theory before I emailed you.

   As I mentioned, my program is a Trojan Detector. It learns all the EXE files you normally run. Then if a new, unknown process starts running, it shuts it down. My old code could do that. The problem was an option to delete the file from disk too. That worked with my old code on Win 98, because on Win 98 my old code returned the full file path. Since my code did not return the full file path on NT based computers, my program could not delete the file. I have incorporated yor code into my program. My program now uses my old code to detect the EXE file. If the user has elected to have my program delete the file too and my code has not provided the full path, my code calls your code (the one you supplied first), supplies the EXE file name, and gets the full path (doing a disk search if your code fail to find the path). Then it shuts down the EXE file using my original code and deletes it using the path obtained by your code. It works.
    I am awarding you the points, based on your first answer, which is what I am using. Thanks.
    BTW, I'll be glad to give you a free copy of my Trojan Slayer program, if you like.