对于vb的截屏的基本代码

Public Class Form1

    Private Declare Function CreateCompatibleDC Lib "GDI32" (ByVal hDC As Integer) As Integer
    Private Declare Function CreateCompatibleBitmap Lib "GDI32" (ByVal hDC As Integer, ByVal nWidth As Integer, ByVal nHeight As Integer) As Integer
    Private Declare Function SelectObject Lib "GDI32" (ByVal hDC As Integer, ByVal hObject As Integer) As Integer
    Private Declare Function BitBlt Lib "GDI32" (ByVal srchDC As Integer, ByVal srcX As Integer, ByVal srcY As Integer, ByVal srcW As Integer, ByVal srcH As Integer, ByVal desthDC As Integer, ByVal destX As Integer, ByVal destY As Integer, ByVal op As Integer) As Integer
    Private Declare Function DeleteDC Lib "GDI32" (ByVal hDC As Integer) As Integer
    Private Declare Function DeleteObject Lib "GDI32" (ByVal hObj As Integer) As Integer
    Declare Function GetDC Lib "user32" Alias "GetDC" (ByVal hwnd As Integer) As Integer
    Const SRCCOPY As Integer = &HCC0020

    Dim bit As Bitmap
    Friend Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim hDC, hMDC As Integer
        Dim hBMP, hBMPOld As Integer
        Dim sw, sh As Integer
        hDC = GetDC(0)  '///获取窗口的句柄
        hMDC = CreateCompatibleDC(hDC)
        sw = Screen.PrimaryScreen.Bounds.Width  '//是获取屏幕的尺寸的,
        sh = Screen.PrimaryScreen.Bounds.Height
        hBMP = CreateCompatibleBitmap(hDC, sw, sh)'//创建一个位图
        hBMPOld = SelectObject(hMDC, hBMP)'//选择一个位图到设备当中去
        BitBlt(hMDC, 0, 0, sw, sh, hDC, 0, 0, SRCCOPY)'//将源矩形区域直接拷贝到目标矩形区域
        hBMP = SelectObject(hMDC, hBMPOld)
        bit = Image.FromHbitmap(New IntPtr(hBMP))
        DeleteDC(hDC)
        DeleteDC(hMDC)
        DeleteObject(hBMP)

    End Sub