Filename of the active program

[Dejvi]

How to get the filename of the active program, if all I have is the handle (hWnd) of the active program?

[Matthew Gates]

Try this:

'Author: Sam Huggill
'Author's email: [url]http://www.programmerz.com/vb/[/url]
'Date Submitted: 2/6/1999
'Compatibility: VB 6,VB 5
 
'Task: Returns the .exe name from the given handle.
 
'Declarations
Public Const TH32CS_SNAPPROCESS As Long = 2&
Public Const MAX_PATH As Long = 260
 
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 * MAX_PATH
End Type
 
Public Declare Function GetWindowThreadProcessId Lib "user32" (ByVal hWnd
As Long, lpdwProcessId As Long) As Long
 
Public Declare Function CreateToolhelpSnapshot Lib "Kernel32" Alias
"CreateToolhelp32Snapshot" (ByVal lFlgas As Long, ByVal lProcessID As
Long) As Long
 
Public Declare Function ProcessFirst Lib "Kernel32" Alias "Process32First"
(ByVal hSnapshot As Long, uProcess As PROCESSENTRY32) As Long
 
Public Declare Function ProcessNext Lib "Kernel32" Alias "Process32Next"
(ByVal hSnapshot As Long, uProcess As PROCESSENTRY32) As Long
 
Public Declare Sub CloseHandle Lib "Kernel32" (ByVal hPass As Long)
 
Public Function GetExeFromHandle(hWnd As Long) As String
Dim threadID As Long, processID As Long, hSnapshot As Long
Dim uProcess As PROCESSENTRY32, rProcessFound As Long
Dim i As Integer, szExename As String
' Get ID for window thread
threadID = GetWindowThreadProcessId(hWnd, processID)
' Check if valid
If threadID = 0 Or processID = 0 Then Exit Function
' Create snapshot of current processes
hSnapshot = CreateToolhelpSnapshot(TH32CS_SNAPPROCESS, 0&)
' Check if snapshot is valid
If hSnapshot = -1 Then Exit Function
'Initialize uProcess with correct size
uProcess.dwSize = Len(uProcess)
'Start looping through processes
rProcessFound = ProcessFirst(hSnapshot, uProcess)
Do While rProcessFound
If uProcess.th32ProcessID = processID Then
'Found it, now get name of exefile
i = InStr(1, uProcess.szexeFile, Chr(0))
If i > 0 Then szExename = Left$(uProcess.szexeFile, i - 1)
Exit Do
Else
'Wrong ID, so continue looping
rProcessFound = ProcessNext(hSnapshot, uProcess)
End If
Loop
Call CloseHandle(hSnapshot)
GetExeFromHandle = szExename
End Function
 
 
Private Sub Command1_Click()
    MsgBox GetExeFromHandle(Me.hWnd)
End Sub