VB - GetHwndEXE (EXE Name from Window Handle)

[Aaron Young]

The following code is a function to return the Executable name from any given Window Handle.

In a Standard Module:'------------------------------------------------------------------
' GetHwndEXE()
'
' Written by Aaron Young, 08/10/2000
'
' Extract the EXE Name and Path from a Given Window Handle
'
'------------------------------------------------------------------
'
'In a Module...
Private 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

Private Type OSVERSIONINFO
dwOSVersionInfoSize As Long
dwMajorVersion As Long
dwMinorVersion As Long
dwBuildNumber As Long
dwPlatformId As Long
szCSDVersion As String * 128
End Type

Private Declare Function Process32First Lib "kernel32" (ByVal hSnapshot As Long, lppe As PROCESSENTRY32) As Long
Private Declare Function Process32Next Lib "kernel32" (ByVal hSnapshot As Long, lppe As PROCESSENTRY32) As Long
Private Declare Function CloseHandle Lib "Kernel32.dll" (ByVal Handle As Long) As Long
Private Declare Function OpenProcess Lib "Kernel32.dll" (ByVal dwDesiredAccessas As Long, ByVal bInheritHandle As Long, ByVal dwProcId As Long) As Long
Private Declare Function GetModuleFileNameExA Lib "psapi.dll" (ByVal hProcess As Long, ByVal hModule As Long, ByVal ModuleName As String, ByVal nSize As Long) As Long
Private Declare Function EnumProcessModules Lib "psapi.dll" (ByVal hProcess As Long, ByRef lphModule As Long, ByVal cb As Long, ByRef cbNeeded As Long) As Long
Private Declare Function CreateToolhelp32Snapshot Lib "kernel32" (ByVal dwFlags As Long, ByVal th32ProcessID As Long) As Long
Private Declare Function GetVersionEx Lib "kernel32" Alias "GetVersionExA" (lpVersionInformation As OSVERSIONINFO) As Long
Private Declare Function GetWindowThreadProcessId Lib "user32" (ByVal hWnd As Long, lpdwProcessId As Long) As Long

Private Const VER_PLATFORM_WIN32_WINDOWS = 1
Private Const PROCESS_QUERY_INFORMATION = 1024
Private Const PROCESS_VM_READ = 16
Private Const TH32CS_SNAPPROCESS = &H2

Private Function CheckVersion() As Long
Dim tOS As OSVERSIONINFO
tOS.dwOSVersionInfoSize = Len(tOS)
Call GetVersionEx(tOS)
CheckVersion = tOS.dwPlatformId
End Function

Public Function GetHwndEXE(ByVal hWnd As Long) As String
Dim lProcessID As Long, lThread As Long
Dim lProcessHandle As Long
Dim sName As String, lModule As Long
Dim bMore As Boolean, tPROCESS As PROCESSENTRY32
Dim lSnapShot As Long

lThread = GetWindowThreadProcessId(hWnd, lProcessID)

If CheckVersion() = VER_PLATFORM_WIN32_WINDOWS Then
'Windows 9x
'Create a SnapShot of the Currently Running Processes
lSnapShot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0)
If lSnapShot < 0 Then Exit Function

tPROCESS.dwSize = Len(tPROCESS)

'Enumerate those processes until we find a match
bMore = Process32First(lSnapShot, tPROCESS)
While bMore And tPROCESS.th32ProcessID <> lProcessID
bMore = Process32Next(lSnapShot, tPROCESS)
Wend

'If a match was found, get the EXE Path and Filename
If tPROCESS.th32ProcessID = lProcessID Then
sName = Left$(tPROCESS.szExeFile, InStr(tPROCESS.szExeFile, Chr(0)) - 1)
GetHwndEXE = sName
End If

Else
'Win NT
'Create an Instance of the Process
lProcessHandle = OpenProcess(PROCESS_QUERY_INFORMATION Or PROCESS_VM_READ, 0&, lProcessID)

'If the Process was successfully created, get the EXE
If lProcessHandle Then
'Just get the First Module, all we need is the Handle to get the Filename..
If EnumProcessModules(lProcessHandle, lModule, 4, 0&) Then
sName = Space(260)
Call GetModuleFileNameExA(lProcessHandle, lModule, sName, Len(sName))
GetHwndEXE = sName
End If
'Close the Process Handle
Call CloseHandle(lProcessHandle)
End If
End If

End FunctionExample Usage:sEXE = GetHwndEXE(Me.hWnd)