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【CSharp】 winform实现截屏
作者:Dezai.CN / 发布于2013/5/12/ 796

	namespace Message
	{
	 partial class Form3
	 {
	 /// <summary>
	 /// Required designer variable.
	 /// </summary>
	 private System.ComponentModel.IContainer components = null;

	 /// <summary>
	 /// Clean up any resources being used.
	 /// </summary>
	 /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
	 protected override void Dispose(bool disposing)
	 {
	 if (disposing && (components != null))
	 {
	 components.Dispose();
	 }
	 base.Dispose(disposing);
	 }

	 #region Windows Form Designer generated code

	 /// <summary>
	 /// Required method for Designer support - do not modify
	 /// the contents of this method with the code editor.
	 /// </summary>
	 private void InitializeComponent()
	 {
	 this.saveFileDialog1 = new System.Windows.Forms.SaveFileDialog();
	 this.SuspendLayout();
	 //
	 // Form3
	 //
	 this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
	 this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
	 this.ClientSize = new System.Drawing.Size(353, 347);
	 this.Cursor = System.Windows.Forms.Cursors.Cross;
	 this.Name = "Form3";
	 this.Text = "Form3";
	 this.Load += new System.EventHandler(this.Form3_Load);
	 this.MouseUp += new System.Windows.Forms.MouseEventHandler(this.Form3_MouseUp);
	 this.MouseDoubleClick += new System.Windows.Forms.MouseEventHandler(this.Form3_DoubleClick);
	 this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.Form3_MouseDown);
	 this.MouseMove += new System.Windows.Forms.MouseEventHandler(this.Form3_MouseMove);
	 this.ResumeLayout(false);

	 }

	 #endregion

	 private System.Windows.Forms.SaveFileDialog saveFileDialog1;
	 }
	}

	

	

	

	

	using System;
	using System.Collections.Generic;
	using System.ComponentModel;
	using System.Data;
	using System.Drawing;
	using System.Text;
	using System.Windows.Forms;

	namespace Message
	{
	 public partial class Form3 : Form
	 {
	 private bool down = false;
	 private Point firstPoint;
	 private Pen p = new Pen(Color.Red);
	 private Graphics gra;
	 private Rectangle rectangle;//存储用户截取的矩形
	 private FormChat f4;
	 public Form3(FormChat f4)
	 {
	 InitializeComponent();
	 this.f4 = f4;
	 }

	 private void Form3_Load(object sender, EventArgs e)
	 {
	 Image img = new Bitmap(Screen.AllScreens[0].Bounds.Width, Screen.AllScreens[0].Bounds.Height);//创建一个和屏幕同样大小的图像
	 Graphics g = Graphics.FromImage(img);//绘制这个图像
	 //将屏幕绘制到此图像，第一，二个Point是屏幕要截取的左上角的坐标和绘制到图像的左上角的坐标
	 g.CopyFromScreen(new Point(0, 0), new Point(0, 0), Screen.AllScreens[0].Bounds.Size);
	 this.BackgroundImage = img;
	 this.FormBorderStyle = FormBorderStyle.None;
	 this.Bounds = Screen.PrimaryScreen.Bounds;
	 gra = this.CreateGraphics();//主要为了用户截取方便
	 }
	 private void Form3_MouseDown(object sender, MouseEventArgs e)
	 {
	 if (e.Button == MouseButtons.Left)
	 {
	 down = true;
	 firstPoint = e.Location;
	 }
	 }

	 private void Form3_MouseUp(object sender, MouseEventArgs e)
	 {
	 if (e.Button == MouseButtons.Left)
	 {
	 down = false;
	 }
	 if (e.Button == MouseButtons.Middle)
	 {
	 this.Close();
	 }
	 }

	 private void Form3_MouseMove(object sender, MouseEventArgs e)
	 {
	 if (down)
	 {
	 gra.DrawImage(this.BackgroundImage, 0, 0);
	 rectangle = new Rectangle(Math.Min(firstPoint.X, e.X), Math.Min(e.Y, firstPoint.Y), Math.Abs(e.X - firstPoint.X), Math.Abs(e.Y - firstPoint.Y));
	 gra.DrawRectangle(p, rectangle);
	 }
	 }
	 private void Form3_DoubleClick(object sender, MouseEventArgs e)
	 {
	 if (rectangle.Width != 0 && rectangle.Height != 0)
	 {
	 gra.DrawImage(this.BackgroundImage, 0, 0);
	 Image im = new Bitmap(rectangle.Width, rectangle.Height);
	 Graphics g = Graphics.FromImage(im);
	 g.CopyFromScreen(rectangle.Location, new Point(0, 0), rectangle.Size);
	 if (((MouseEventArgs)e).Button == MouseButtons.Left)
	 {
	 Clipboard.Clear();
	 Clipboard.SetImage(im);
	 this.f4.Copy();
	 this.Close();
	 }
	 }
	 }
	 }
	}
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