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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
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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