by Nedim Sabic (2 Submissions)
Category: Windows API Call/Explanation
Compatability: VB 6.0
Difficulty: Unknown Difficulty
Originally Published: Thu 4th July 2002
Date Added: Mon 8th February 2021
Rating: 
(1 Votes)
With this code you can enumerate all processes on your machine.
API Declarations
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 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 * 260
End Type
Public Type OSVERSIONINFO
dwOSVersionInfoSize As Long
dwMajorVersion As Long
dwMinorVersion As Long
dwBuildNumber As Long
dwPlatformId As Long
szCSDVersion As String * 128
End Type
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
Function StrZToStr(s As String) As String
StrZToStr = Left$(s, Len(s) - 1)
End Function
Public Function getVersion() As Long
Dim osinfo As OSVERSIONINFO
Dim retvalue As Integer
osinfo.dwOSVersionInfoSize = 148
osinfo.szCSDVersion = Space$(128)
retvalue = GetVersionExA(osinfo)
getVersion = osinfo.dwPlatformId
End Function
VBcoders
Rem e-mail:[email protected]
Rem Sorry,this code is wrote without comments
Rem on the form 2 command buttons and listbox
Option Explicit
Private Sub cmdEnum_Click()
List1.Clear
Select Case getVersion()
Case 1
Dim f As Long
Dim sname As String
Dim hSnap As Long
Dim proc As PROCESSENTRY32
hSnap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0)
If hSnap = hNull Then Exit Sub
proc.dwSize = Len(proc)
f = Process32First(hSnap, proc)
Do While f
sname = StrZToStr(proc.szExeFile)
List1.AddItem sname
f = Process32Next(hSnap, proc)
Loop
Case 2
Dim cb As Long
Dim cbNeeded As Long
Dim NumElements As Long
Dim ProcessIDs() As Long
Dim cbNeeded2 As Long
Dim NumElements2 As Long
Dim Modules(1 To 200) As Long
Dim lRet As Long
Dim ModuleName As String
Dim nSize As Long
Dim hProcess As Long
Dim i As Long
cb = 8
cbNeeded = 96
Do While cb <= cbNeeded
cb = cb * 2
ReDim ProcessIDs(cb / 4) As Long
lRet = EnumProcesses(ProcessIDs(1), cb, cbNeeded)
Loop
NumElements = cbNeeded / 4
For i = 1 To NumElements
hProcess = OpenProcess(PROCESS_QUERY_INFORMATION _
Or PROCESS_VM_READ, 0, ProcessIDs(i))
If hProcess <> 0 Then
lRet = EnumProcessModules(hProcess, Modules(1), 200, _
cbNeeded2)
If lRet <> 0 Then
ModuleName = Space(MAX_PATH)
nSize = 500
lRet = GetModuleFileNameExA(hProcess, Modules(1), _
ModuleName, nSize)
List1.AddItem Left(ModuleName, lRet)
End If
End If
lRet = CloseHandle(hProcess)
Next
End Select
End Sub
Private Sub cmdQuit_Click()
End
End Sub
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