设置透明窗体.frm

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VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   3195
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4680
   LinkTopic       =   "Form1"
   ScaleHeight     =   3195
   ScaleWidth      =   4680
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command1 
      Caption         =   "复原"
      Height          =   375
      Left            =   1560
      TabIndex        =   0
      Top             =   1080
      Width           =   1155
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Declare Function CreateCompatibleBitmap Lib "gdi32" (ByVal hdc As Long, ByVal nWidth As Long, ByVal nHeight As Long) As Long
Private Declare Function SelectObject Lib "gdi32" (ByVal hdc As Long, ByVal hObject As Long) As Long
Private hBitmap As Long

Private Sub Command1_Click()
    On Error Resume Next
    SelectObject Me.hdc, hBitmap
    Me.Refresh
End Sub

Private Sub Form_Paint()
    Me.AutoRedraw = True
    hBitmap = CreateCompatibleBitmap(Me.hdc, 0, 0)
    DoEvents
    hBitmap = SelectObject(Me.hdc, hBitmap)
    Me.Refresh
End Sub