Private Const GW_HWNDNEXT As Long = 2&
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As Long, ByVal lpWindowName As Long) As Long
Private Declare Function GetParent Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function GetWindowThreadProcessId Lib "user32" (ByVal hwnd As Long, lpdwProcessId As Long) As Long
Private Declare Function GetWindow Lib "user32" (ByVal hwnd As Long, ByVal wCmd As Long) As Long
'
Public Function InstanceToWnd(ByVal target_pid As Long) As Long 'API-Guid
Dim test_hwnd As Long, test_pid As Long, test_thread_id As Long
test_hwnd = FindWindow(ByVal 0&, ByVal 0&)
Do While test_hwnd <> 0&
If GetParent(test_hwnd) = 0& Then
test_thread_id = GetWindowThreadProcessId(test_hwnd, test_pid)
If test_pid = target_pid Then
InstanceToWnd = test_hwnd
Exit Do
End If
End If
test_hwnd = GetWindow(test_hwnd, GW_HWNDNEXT)
Loop
End Function