VB 中如何是屏幕刷新

Private Const WM_KEYDOWN = &H100

Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Private Declare Function PostMessage Lib "user32" Alias "PostMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long

Private Sub Command1_Click()
Dim Desktop As Long

Desktop = FindWindow("Progman", "Program Manager")

PostMessage Desktop, WM_KEYDOWN, vbKeyF5, 0
End Sub

Form.Reflash