Private Declare Function ShowWindow Lib "user32.dll" (ByVal hwnd As Long, ByVal nCmdShow As Long) As Long
Private Declare Function FindWindow Lib "user32.dll" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Private Sub Command1_Click()
Dim obHwnd As Long
obHwnd = FindWindow(vbNullString, "你想最大化的那个窗口标题")
If obHwnd > 0 Then
ShowWindow obHwnd, 3
End If
End Sub