[原创]屏幕部分截取工具

    前段时间写的小程序。屏幕截取是个很常用的功能,但是Win自带的Print功能截取的范围太固定了(当前窗体或者全屏),因此平时要用屏幕截取时本人就只能开QQ了,但是开QQ太麻烦.并且被QQ窗体遮掩后的那部分窗体又截不到了,因此本程序诞生了!
一、主要原理：
     通过两个窗体事件Mouse_Down和Mouse_UP来捕获鼠标移动的矩形区域，通过使用Graphics类的CopyFromScreen方法来把该矩形区域save到指定目录。
二、主要代码：

CopyRight 2007 By SeeK [tseek1@gmail.com]#region CopyRight 2007 By SeeK [tseek1@gmail.com]
/**//*
 * 12/23/2007
 * This Program is written by SeeK [tseek1@gmail.com]
 * it's a screen intercept programer.
 * everyone who will change this source please send a mail to me.
 * */
#endregion
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace 屏幕部分截取
{
    public partial class Form1 : Form
    {
        Member Var Decline#region Member Var Decline
        private Point clickPoint;
        private Point currentPoint;
        private string path;
        #endregion
        /**//// <summary>
        /// Initialize form and decline some Event 
        /// </summary>
        public Form1()
        {
            InitializeComponent();
            this.MouseUp += new MouseEventHandler(Mouse_Up);
            this.MouseDown += new MouseEventHandler(Mouse_Down);
        }

        System Events and Self define Events area#region System Events and Self define Events area

        private void Mouse_Down(object sender, MouseEventArgs e)
        {
            clickPoint = new Point(System.Windows.Forms.Control.MousePosition.X, System.Windows.Forms.Control.MousePosition.Y);
        }

        private void Mouse_Up(object sender, MouseEventArgs e)
        {
            currentPoint = new Point(System.Windows.Forms.Control.MousePosition.X, System.Windows.Forms.Control.MousePosition.Y);
            saveFileDialog1.DefaultExt = "jpg"; 
            saveFileDialog1.Filter = "JPEG files (*.jpg)|*.jpg";
            if (saveFileDialog1.ShowDialog() == DialogResult.OK)
            {
                path = saveFileDialog1.FileName;
            }
            if (SavePic())
            {
                MessageBox.Show("图片成功保存在" + path);
                this.WindowState = FormWindowState.Normal;
                this.Opacity = 1.00;
            }
            else
            {
                MessageBox.Show("保存失败！");
            }
        }
        /**//// <summary>
        /// setting form's opacity with a small double number and make form Maximized to get the point.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            this.Opacity = 0.01;
            this.WindowState = FormWindowState.Maximized;
            //this.Show();

        }
        #endregion
        private bool SavePic()
        {
            Rectangle selectRec=new Rectangle(this.clickPoint.X,this.clickPoint.Y,this.currentPoint.X-this.clickPoint.X,this.currentPoint.Y-this.clickPoint.Y);
            try
            {
                Bitmap pic = new Bitmap(selectRec.Width, selectRec.Height);
                Graphics g = Graphics.FromImage(pic);
                g.CopyFromScreen(clickPoint,Point.Empty, selectRec.Size);
                pic.Save(path, System.Drawing.Imaging.ImageFormat.Jpeg);
                return true;
            }
            catch
            {
                return false;
            }
           
        }

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