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Tip of the Day
Language: VB6,WIn9x,,Win2K
Expertise: Intermediate
Feb 6, 2001



Building the Right Environment to Support AI, Machine Learning and Deep Learning

GetProcessModules - The list of DLLs and OCXes a process uses

Const MAX_MODULE_NAmeInfo = 255
Const MAX_PATH = 260

Private Type MODULEENTRY32
    dwSize As Long
    th32ModuleID As Long
    th32ProcessID As Long
    GlblcntUsage As Long
    ProccntUsage As Long
    modBaseAddr As Long
    modBaseSize As Long
    hModule As Long
    szModule As String * 256
    szExePath As String * MAX_PATH
End Type

Private Declare Function CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (ByVal _
    dest As Any, ByVal source As Any, ByVal bytes As Long) As Long
Private Declare Function CreateToolhelpSnapshot Lib "kernel32" Alias _
    "CreateToolhelp32Snapshot" (ByVal lFlags As Long, ByVal lProcessID As Long) _
    As Long
Private Declare Function Module32First Lib "kernel32" (ByVal hSnapshot As Long, _
    lpmeInfo As MODULEENTRY32) As Long
Private Declare Function Module32Next Lib "kernel32" (ByVal hSnapshot As Long, _
    lpmeInfo As MODULEENTRY32) As Long
Private Declare Sub CloseHandle Lib "kernel32" (ByVal hPass As Long)
Private Declare Function GetCurrentProcessId Lib "kernel32" () As Long

' Return the list of DLLs and OCXes that a process uses
' if argument if omitted, the current process is used
' names are stored starting at element 1 in the result array
' thus UBound(result) gives the number of modules
' in general, the first element is the name of the EXE file.

' NOTES: works only on Win 9x and 2000 (not on NT)

Function GetProcessModules(Optional ByVal processID As Long = -1) As String()
    Dim meInfo As MODULEENTRY32
    Dim success As Long
    Dim hSnapshot As Long
    ReDim res(0) As String
    Dim count As Long
    ' provide a default argument, if missing
    If processID = -1 Then processID = GetCurrentProcessId
    ' get information about the given process
    hSnapshot = CreateToolhelpSnapshot(TH32CS_SNAPMODULE, processID)
    ' exit now if process ID is invalid
    If hSnapshot = 0 Then GoTo ExitProc
    ' prepare the structure for receiving info
    meInfo.dwSize = Len(meInfo)
    ' get info on the first module
    success = Module32First(hSnapshot, meInfo)
    Do While success
        ' consider only modules belonging to the specified process
        If meInfo.th32ProcessID = processID Then
            count = count + 1
            ' make room in the array, if needed
            If count > UBound(res) Then
                ReDim Preserve res(count + 100) As String
            End If
            ' store the result
            res(count) = Left$(meInfo.szExePath, InStr(meInfo.szExePath & _
                vbNullChar, vbNullChar) - 1)
        End If
        ' continue the search
        success = Module32Next(hSnapshot, meInfo)
    ' close the snapshot
    CloseHandle hSnapshot
    ' trim out elements in excess
    ReDim Preserve res(0 To count) As String
    GetProcessModules = res
End Function

Francesco Balena
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