vba - 如何使用vba在windowapi中使用findwindow函数定位窗口？

Question

我目前正在尝试找到一种方法来使用 Findwindow 函数检查窗口是否打开。如果我知道窗口的完整名称，我就能找到该窗口。在下面的代码中，我知道窗口的名称是“win32api - Notepad”，因此我可以轻松找到该窗口，但是我想知道如果我只知道“win32*”等部分名称，是否可以识别该窗口。

Public Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long

Sub runapplication()


hwnd = FindWindow(vbNullString, "win32api - Notepad")
MsgBox (hwnd)
End Sub

Answer 1

实现此目的的一种方法是使用 EnumWindows API函数。由于它通过回调函数进行操作，因此您需要将条件和结果缓存在超出调用函数范围的地方:

Public Declare Function EnumWindows Lib "user32" (ByVal lpEnumFunc As Long, _
                                                  ByVal param As Long) As Long
Public Declare Function IsWindowVisible Lib "User32" (ByVal hWnd 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
Public Const MAX_LEN = 260

Public results As Dictionary
Public criteria As String

Public Sub Example()
    criteria = "win32*"
    Set results = New Dictionary
    Call EnumWindows(AddressOf EnumWindowCallback, &H0)
    Dim result As Variant
    For Each result In results.Keys
        Debug.Print result & " - " & results(result)
    Next result
End Sub

Public Function EnumWindowCallback(ByVal hwnd As Long, ByVal param As Long) As Long
    Dim retValue As Long
    Dim buffer As String       
    If IsWindowVisible(hwnd) Then
        buffer = Space$(MAX_LEN)
        retValue = GetWindowText(hwnd, buffer, Len(buffer))
        If retValue Then
            If buffer Like criteria Then
                results.Add hwnd, Left$(buffer, retValue)
            End If
        End If
    End If
    EnumWindowCallback = 1
End Function