VB6 根据进程ID(PID)获取窗体句柄

模块代码：

Option Explicit

Private Const GW_HWNDNEXT = 2

Private Declare Function GetParent Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function GetWindow Lib "user32" (ByVal hwnd As Long, ByVal wCmd As Long) As Long
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Private Declare Function GetWindowThreadProcessId Lib "user32" (ByVal hwnd As Long, lpdwprocessid As Long) As Long
Public Declare Function GetWindowText Lib "user32" Alias "GetWindowTextA" (ByVal hwnd As Long, ByVal lpString As String, ByVal cch As Long) As Long

Private Function ProcIDFromWnd(ByVal hwnd As Long) As Long
    Dim idProc As Long

    ' Get PID for this HWnd
    GetWindowThreadProcessId hwnd, idProc

    ' Return PID
    ProcIDFromWnd = idProc
End Function

Public Function GetWinHandle(hInstance As Long) As Long
    Dim tempHwnd As Long

    ' Grab the first window handle that Windows finds:
    tempHwnd = FindWindow(vbNullString, vbNullString)

    ' Loop until you find a match or there are no more window handles:
    Do Until tempHwnd = 0
        ' Check if no parent for this window
        If GetParent(tempHwnd) = 0 Then
            ' Check for PID match
            If hInstance = ProcIDFromWnd(tempHwnd) Then
                ' Return found handle
                GetWinHandle = tempHwnd
                ' Exit search loop
                Exit Do
            End If
        End If

        ' Get the next window handle
        tempHwnd = GetWindow(tempHwnd, GW_HWNDNEXT)
    Loop
End Function