hWnd / Process ID

Is there a way to get the Process ID from the window's hWnd or get the hWnd of a window with a process id?

Thanks,

Absolutely:

Code:

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Private Const GW_HWNDFIRST = 0
Private Const GW_HWNDNEXT = 2
Private Const GW_CHILD = 5

Private Declare Function GetWindow Lib "user32" (ByVal hwnd As Long, ByVal wCmd As Long) As Long
Private Declare Function GetDesktopWindow Lib "user32" () As Long
Private Declare Function GetWindowThreadProcessId Lib "user32" (ByVal hwnd As Long, lpdwProcessId As Long) As Long
Private Declare Function BringWindowToTop Lib "user32" (ByVal hwnd As Long) As Long

Public Function GetHwndFromProcess(p_lngProcessId As Long) As Long
    Dim lngDesktop As Long
    Dim lngChild As Long
    Dim lngChildProcessID As Long
   
    On Error Resume Next
   
    'get the hWnd of the desktop
    lngDesktop = GetDesktopWindow()

    lngChild = GetWindow(lngDesktop, GW_CHILD)
   
    Do While lngChild <> 0
   
        'get the ThreadProcessID of the window
        Call GetWindowThreadProcessId(lngChild, lngChildProcessID)
       
        'if ProcessId matches the parameter passed
        'then return that value
        If lngChildProcessID = p_lngProcessId Then
            GetHwndFromProcess = lngChild
            Exit Do
        End If
       
        'not found, continue enumeration
        lngChild = GetWindow(lngChild, GW_HWNDNEXT)
    Loop
End Function

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Call this function like this:

Code:

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Dim lngHwnd As Long

lngHwnd = GetHwndFromProcess(ValidProcessId)

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