To check if a program is running by looking for the caption:
Code:
Private Declare Function FindWindow Lib "user32.dll" Alias "FindWindowA" (ByVal lpClassName As Any, ByVal lpWindowName As Any) As Long
h = FindWindow(vbNullString, "Calculator")
'Find window by caption
If h <> 0 Then 'if found then
Msgbox "Running!"
Else 'if not found then
Msgbox "Not running!"
End If
To check if a program is running by looking for the class:
Code:
h = FindWindow("SciCalc", vbNullString)
'Find window by caption
If h <> 0 Then 'if found then
Msgbox "Running!"
Else 'if not found then
Msgbox "Not running!"
End If
Or both:
Code:
h = FindWindow("SciCalc", "Calculator")
'Find window by caption
If h <> 0 Then 'if found then
Msgbox "Running!"
Else 'if not found then
Msgbox "Not running!"
End If
To make sure only 1 instance of your program runs:
Code:
Private Sub Form_Load()
If App.PrevInstance Then
Msgbox "Program aready running!"
AppActivate App.Title
Unload Me
End
End If
End Sub
And to find if a program is running by knowing it's exe's file path:
Code:
Private Declare Function GetWindowsDirectory Lib "kernel32" Alias "GetWindowsDirectoryA" (ByVal lpBuffer As String, ByVal nSize 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 strModuleName 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 ' 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 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
'STANDARD_RIGHTS_REQUIRED Or SYNCHRONIZE Or &HFFF
Public Const PROCESS_ALL_ACCESS = &H1F0FFF
Public Const TH32CS_SNAPPROCESS = &H2&
Public Const hNull = 0
Public Enum ePlatform
eWin95_98 = 1
eWinNT = 2
End Enum
Public gDBType As String
Public Function IsApplicationRunning(pEXEName As String) As Boolean
On Error Resume Next
Select Case getVersion()
Case eWin95_98
Dim lProc As Long, strName As String
Dim hSnap As Long, proc As PROCESSENTRY32
hSnap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0)
If hSnap = hNull Then Exit Function
proc.dwSize = Len(proc)
' Iterate through the processes
lProc = Process32First(hSnap, proc)
Do While lProc
strName = StrZToStr(proc.szExeFile)
If InStr(UCase(strName), UCase(pEXEName)) Then
IsApplicationRunning = True
Exit Function
End If
lProc = Process32Next(hSnap, proc)
Loop
Case eWinNT
Dim cb As Long
Dim cbNeeded As Long
Dim NumElements As Long
Dim lProcessIDs() As Long
Dim cbNeeded2 As Long
Dim lNumElements2 As Long
Dim lModules(1 To 200) As Long
Dim lRet As Long
Dim strModuleName As String
Dim nSize As Long
Dim hProcess As Long
Dim i As Long
'Get the array containing the process id's for each process object
cb = 8
cbNeeded = 96
Do While cb <= cbNeeded
cb = cb * 2
ReDim lProcessIDs(cb / 4) As Long
lRet = EnumProcesses(lProcessIDs(1), cb, cbNeeded)
Loop
NumElements = cbNeeded / 4
For i = 1 To NumElements
'Get a handle to the Process
hProcess = OpenProcess(PROCESS_QUERY_INFORMATION _
Or PROCESS_VM_READ, 0, lProcessIDs(i))
'Got a Process handle
If hProcess <> 0 Then
'Get an array of the module handles for the specified
'process
lRet = EnumProcessModules(hProcess, lModules(1), 200, _
cbNeeded2)
'If the Module Array is retrieved, Get the ModuleFileName
If lRet <> 0 Then
strModuleName = Space(MAX_PATH)
nSize = 500
lRet = GetModuleFileNameExA(hProcess, lModules(1), _
strModuleName, nSize)
strModuleName = Left(strModuleName, lRet)
'Check for the client application running
If InStr(UCase(strModuleName), UCase(pEXEName)) Then
IsApplicationRunning = True
Exit Function
End If
'List1.AddItem Left(strModuleName, lRet)
End If
End If
'Close the handle to the process
lRet = CloseHandle(hProcess)
Next
End Select
End Function
Function StrZToStr(pString As String) As String
StrZToStr = Left$(pString, Len(pString) - 1)
End Function
Public Function getVersion() As ePlatform
Dim osinfo As OSVERSIONINFO
Dim lRetVal As Integer
osinfo.dwOSVersionInfoSize = 148
osinfo.szCSDVersion = Space$(128)
lRetVal = GetVersionExA(osinfo)
getVersion = osinfo.dwPlatformId
End Function
If IsApplicationRunning("C:\program.exe") Then
MsgBox "Application is running."
Else
MsgBox "Application is not running."
End If
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