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