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   源码介绍

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using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Runtime.InteropServices;

namespace CaptureScreen
{
	/// <summary>
	/// CaptureScreenForm 的摘要说明。
	/// </summary>
	public class CaptureScreenForm : System.Windows.Forms.Form
	{
		private System.Windows.Forms.PictureBox picbox;
		private System.Windows.Forms.Button exitBtn;
		private System.Windows.Forms.Button aboutBtn;
		private System.Windows.Forms.Button ClearBtn;
		private System.Windows.Forms.Button saveBtn;
		private System.Windows.Forms.Button fullScreenBtn;
		private System.Windows.Forms.Button mouseCaptureBtn;

		public static Image image = null ;
		private System.Windows.Forms.Panel panel1;

		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		private System.ComponentModel.Container components = null;

		public CaptureScreenForm()
		{
			//
			// Windows 窗体设计器支持所必需的
			//
			InitializeComponent();

			//
			// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
			//
		}

		/// <summary>
		/// 清理所有正在使用的资源。
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows 窗体设计器生成的代码
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{
			this.picbox = new System.Windows.Forms.PictureBox();
			this.fullScreenBtn = new System.Windows.Forms.Button();
			this.mouseCaptureBtn = new System.Windows.Forms.Button();
			this.ClearBtn = new System.Windows.Forms.Button();
			this.saveBtn = new System.Windows.Forms.Button();
			this.aboutBtn = new System.Windows.Forms.Button();
			this.exitBtn = new System.Windows.Forms.Button();
			this.panel1 = new System.Windows.Forms.Panel();
			this.panel1.SuspendLayout();
			this.SuspendLayout();
			// 
			// picbox
			// 
			this.picbox.Location = new System.Drawing.Point(0, 40);
			this.picbox.Name = "picbox";
			this.picbox.Size = new System.Drawing.Size(680, 312);
			this.picbox.SizeMode = System.Windows.Forms.PictureBoxSizeMode.AutoSize;
			this.picbox.TabIndex = 0;
			this.picbox.TabStop = false;
			// 
			// fullScreenBtn
			// 
			this.fullScreenBtn.Location = new System.Drawing.Point(0, 0);
			this.fullScreenBtn.Name = "fullScreenBtn";
			this.fullScreenBtn.Size = new System.Drawing.Size(96, 32);
			this.fullScreenBtn.TabIndex = 1;
			this.fullScreenBtn.Text = "全屏截取";
			this.fullScreenBtn.Click  = new System.EventHandler(this.fullScreenBtn_Click);
			// 
			// mouseCaptureBtn
			// 
			this.mouseCaptureBtn.Location = new System.Drawing.Point(120, 0);
			this.mouseCaptureBtn.Name = "mouseCaptureBtn";
			this.mouseCaptureBtn.Size = new System.Drawing.Size(96, 32);
			this.mouseCaptureBtn.TabIndex = 2;
			this.mouseCaptureBtn.Text = "鼠标截取";
			this.mouseCaptureBtn.Click  = new System.EventHandler(this.mouseCaptureBtn_Click);
			// 
			// ClearBtn
			// 
			this.ClearBtn.Location = new System.Drawing.Point(240, 0);
			this.ClearBtn.Name = "ClearBtn";
			this.ClearBtn.Size = new System.Drawing.Size(88, 32);
			this.ClearBtn.TabIndex = 3;
			this.ClearBtn.Text = "清除截取图片";
			this.ClearBtn.Click  = new System.EventHandler(this.ClearBtn_Click);
			// 
			// saveBtn
			// 
			this.saveBtn.Location = new System.Drawing.Point(352, 0);
			this.saveBtn.Name = "saveBtn";
			this.saveBtn.Size = new System.Drawing.Size(96, 32);
			this.saveBtn.TabIndex = 4;
			this.saveBtn.Text = "保存截取图片";
			this.saveBtn.Click  = new System.EventHandler(this.saveBtn_Click);
			// 
			// aboutBtn
			// 
			this.aboutBtn.Location = new System.Drawing.Point(472, 0);
			this.aboutBtn.Name = "aboutBtn";
			this.aboutBtn.Size = new System.Drawing.Size(96, 32);
			this.aboutBtn.TabIndex = 5;
			this.aboutBtn.Text = "关  于";
			this.aboutBtn.Click  = new System.EventHandler(this.aboutBtn_Click);
			// 
			// exitBtn
			// 
			this.exitBtn.Location = new System.Drawing.Point(592, 0);
			this.exitBtn.Name = "exitBtn";
			this.exitBtn.Size = new System.Drawing.Size(88, 32);
			this.exitBtn.TabIndex = 6;
			this.exitBtn.Text = "退  出";
			this.exitBtn.Click  = new System.EventHandler(this.exitBtn_Click);
			// 
			// panel1
			// 
			this.panel1.Controls.Add(this.fullScreenBtn);
			this.panel1.Controls.Add(this.mouseCaptureBtn);
			this.panel1.Controls.Add(this.ClearBtn);
			this.panel1.Controls.Add(this.saveBtn);
			this.panel1.Controls.Add(this.aboutBtn);
			this.panel1.Controls.Add(this.exitBtn);
			this.panel1.Location = new System.Drawing.Point(0, 0);
			this.panel1.Name = "panel1";
			this.panel1.Size = new System.Drawing.Size(680, 32);
			this.panel1.TabIndex = 7;
			// 
			// CaptureScreenForm
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.AutoScroll = true;
			this.ClientSize = new System.Drawing.Size(696, 358);
			this.Controls.Add(this.panel1);
			this.Controls.Add(this.picbox);
			this.Name = "CaptureScreenForm";
			this.Text = "截取屏幕";
			this.panel1.ResumeLayout(false);
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// 应用程序的主入口点。
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new CaptureScreenForm());
		}

		protected override void OnPaint(PaintEventArgs e) 
		{ 
			base.OnPaint (e); 
			if(image != null) 
			{ 
				this.picbox.Image = image; 
			} 
			else 
			{ 
				this.picbox.Image = null; 
				this.picbox.Refresh();
			} 
		} 


		// 引用API

		[System.Runtime.InteropServices.DllImportAttribute("gdi32.dll")] 
		public static extern bool BitBlt( 
			IntPtr hdcDest, //目标设备的句柄 
			int nXDest, // 目标对象的左上角的X坐标 
			int nYDest, // 目标对象的左上角的X坐标 
			int nWidth, // 目标对象的矩形的宽度 
			int nHeight, // 目标对象的矩形的长度 
			IntPtr hdcSrc, // 源设备的句柄 
			int nXSrc, // 源对象的左上角的X坐标 
			int nYSrc, // 源对象的左上角的X坐标 
			System.Int32 dwRop // 光栅的操作值 
			); 


		private void exitBtn_Click(object sender, System.EventArgs e)
		{
			Application.Exit();
		}

		private void aboutBtn_Click(object sender, System.EventArgs e)
		{
			MessageBox.Show("Code by Star in 2006-3-17,E_mail: ygh_01@163.com ,thank you to use this.");
		}

		private void ClearBtn_Click(object sender, System.EventArgs e)
		{
			CaptureScreenForm.image = null;
			this.Invalidate();
		}

		private void saveBtn_Click(object sender, System.EventArgs e)
		{
			SaveFileDialog saveImageDialog = new SaveFileDialog();
			saveImageDialog.Title = "Capture screen image save dialog";
			saveImageDialog.Filter= @"jpeg|*.jpg|bmp|*.bmp|gif|*.gif";

			if(saveImageDialog.ShowDialog() == DialogResult.OK)
			{
			  string fileName = saveImageDialog.FileName.ToString();
			  
				if(fileName != "" && fileName != null)
				{
					string fileExtName = fileName.Substring(fileName.LastIndexOf(".") 1).ToString();

					System.Drawing.Imaging.ImageFormat imgformat = null;
 
					if(fileExtName!="")
					{
						switch(fileExtName) 
						{ 
							case "jpg": 
								imgformat = System.Drawing.Imaging.ImageFormat.Jpeg; 
								break; 
							case "bmp": 
								imgformat = System.Drawing.Imaging.ImageFormat.Bmp; 
								break; 
							case "gif": 
								imgformat = System.Drawing.Imaging.ImageFormat.Gif; 
								break; 
							default: 
								MessageBox.Show("只能存取为: jpg,bmp,gif 格式"); 
								break; 
						} 

					}

					//默认保存为JPG格式
					if(imgformat == null)
					{
						imgformat = System.Drawing.Imaging.ImageFormat.Jpeg;
					}
                    
					try
					{
						CaptureScreenForm.image.Save(fileName,imgformat);
						MessageBox.Show("图片已经成功保存!~~");
					}
					catch
					{
					   MessageBox.Show("保存失败,你还没有截取过图片或已经清空图片!");
					}

				}

			}
		}

		private void fullScreenBtn_Click(object sender, System.EventArgs e)
		{
		    CaptureScreenForm.image = windowFullScreen();
			picbox.Image = CaptureScreenForm.image;
		}

		public static Bitmap windowFullScreen()
		{
			//建立屏幕Graphics
			Graphics grpScreen = Graphics.FromHwnd(IntPtr.Zero);
			//根据屏幕大小建立位图
			Bitmap bitmap = new Bitmap(Screen.PrimaryScreen.Bounds.Width,Screen.PrimaryScreen.Bounds.Height,grpScreen);
			//建立位图相关Graphics
			Graphics grpBitmap = Graphics.FromImage(bitmap);
            //建立屏幕上下文
			IntPtr hdcScreen = grpScreen.GetHdc();
			//建立位图上下文
			IntPtr hdcBitmap = grpBitmap.GetHdc();
			//将屏幕捕获保存在图位中
			BitBlt(hdcBitmap,0,0,bitmap.Width,bitmap.Height,hdcScreen,0,0,0x00CC0020);
			//关闭位图句柄
			grpBitmap.ReleaseHdc(hdcBitmap);
			//关闭屏幕句柄
			grpScreen.ReleaseHdc(hdcScreen);
			//释放位图对像
			grpBitmap.Dispose();
			//释放屏幕对像
			grpScreen.Dispose();

			//返回捕获位图
			return bitmap;
		}

		private void mouseCaptureBtn_Click(object sender, System.EventArgs e)
		{
			MouseCaptureForm mouseCapture = new MouseCaptureForm();
			mouseCapture.Show();
		}
	}
}