在VB.NET中进行抓屏

'**********************************
'Author:wgscd
'功能：抓屏
'QQ153964481
'Date:2005-4-12
'*********************************

Public Class Form1
    Inherits System.Windows.Forms.Form

#Region " Windows 窗体设计器生成的代码 "

    Public Sub New()
        MyBase.New()

        '该调用是 Windows 窗体设计器所必需的。
        InitializeComponent()

        '在 InitializeComponent() 调用之后添加任何初始化

    End Sub

    '窗体重写处置以清理组件列表。
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Windows 窗体设计器所必需的
    Private components As System.ComponentModel.IContainer

    '注意：以下过程是 Windows 窗体设计器所必需的
    '可以使用 Windows 窗体设计器修改此过程。
    '不要使用代码编辑器修改它。
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents Timer1 As System.Windows.Forms.Timer
    Friend WithEvents PictureBox1 As System.Windows.Forms.PictureBox
    Friend WithEvents Button2 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.components = New System.ComponentModel.Container
        Me.Button1 = New System.Windows.Forms.Button
        Me.Timer1 = New System.Windows.Forms.Timer(Me.components)
        Me.PictureBox1 = New System.Windows.Forms.PictureBox
        Me.Button2 = New System.Windows.Forms.Button
        Me.SuspendLayout()
        '
        'Button1
        '
        Me.Button1.ForeColor = System.Drawing.Color.Black
        Me.Button1.Location = New System.Drawing.Point(8, 312)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(112, 32)
        Me.Button1.TabIndex = 0
        Me.Button1.Text = "抓屏"
        '
        'PictureBox1
        '
        Me.PictureBox1.Location = New System.Drawing.Point(8, 8)
        Me.PictureBox1.Name = "PictureBox1"
        Me.PictureBox1.Size = New System.Drawing.Size(392, 288)
        Me.PictureBox1.TabIndex = 4
        Me.PictureBox1.TabStop = False
        '
        'Button2
        '
        Me.Button2.ForeColor = System.Drawing.Color.Black
        Me.Button2.Location = New System.Drawing.Point(264, 312)
        Me.Button2.Name = "Button2"
        Me.Button2.Size = New System.Drawing.Size(112, 32)
        Me.Button2.TabIndex = 5
        Me.Button2.Text = "保存"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.BackColor = System.Drawing.Color.FromArgb(CType(192, Byte), CType(192, Byte), CType(255, Byte))
        Me.ClientSize = New System.Drawing.Size(408, 358)
        Me.Controls.Add(Me.Button2)
        Me.Controls.Add(Me.PictureBox1)
        Me.Controls.Add(Me.Button1)
        Me.ForeColor = System.Drawing.Color.FromArgb(CType(192, Byte), CType(255, Byte), CType(255, Byte))
        Me.Name = "Form1"
        Me.Text = "wgscd"
        Me.ResumeLayout(False)

    End Sub

#End Region

    'VB.NET中进行图象捕获 ，需要先引用一些API，以下是声明：

    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

    '将以下代码添加到Button1_Click事件中：

    Private 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)

        hMDC = CreateCompatibleDC(hDC)

        sw = Screen.PrimaryScreen.Bounds.Width

        sh = Screen.PrimaryScreen.Bounds.Height

        hBMP = CreateCompatibleBitmap(hDC, sw, sh)

        hBMPOld = SelectObject(hMDC, hBMP)

        BitBlt(hMDC, 0, 0, sw, sh, hDC, 0, 0, SRCCOPY)

        hBMP = SelectObject(hMDC, hBMPOld)

        PictureBox1.Image = Image.FromHbitmap(New IntPtr(hBMP))

        DeleteDC(hDC)

        DeleteDC(hMDC)

        DeleteObject(hBMP)

        Me.Button2.Enabled = True

    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

        Me.Button2.Enabled = False

    End Sub
    Dim ofd As New SaveFileDialog
    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

        ofd.Filter = "jpg file|*.jpg|bmp file|*.bmp"

        Dim bmp As Bitmap = Me.PictureBox1.Image

        If ofd.ShowDialog = DialogResult.OK Then
            bmp.Save(ofd.FileName)

        End If
    End Sub
End Class

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