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C#模拟QQ截屏功能

 
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以利用Graphics类的CopyFromScreen方法来实现屏幕截取,舍弃了比较麻烦的API函数,只要几句代码就能实现了,而且这个这个方法能实现只抓取部分区域的屏幕,可以实现类似qq抓屏的功能。
复制C#代码保存代码
using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Drawing.Imaging;
using System.Windows.Forms;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            //获得当前屏幕的分辨率
            Screen scr = Screen.PrimaryScreen;
            Rectangle rc = scr.Bounds;
            int iWidth = rc.Width;
            int iHeight = rc.Height;
            //创建一个和屏幕一样大的Bitmap
            Image myImage = new Bitmap(iWidth, iHeight);
            //从一个继承自Image类的对象中创建Graphics对象
            Graphics g = Graphics.FromImage(myImage);
            //抓屏并拷贝到myimage里
            g.CopyFromScreen(new Point(0, 0), new Point(0, 0), new Size(iWidth, iHeight));
            //保存为文件
            myImage.Save(@"c:/1.jpeg");
        }
    }
}

以上内容转自lijgame的blog,在此对作者表示感谢!
原文地址:http://blog.csdn.net/lijgame/archive/2006/12/18/1447921.aspx

现在就文中的“实现QQ截屏”功能继续研究如下。

1、首先要实现在屏幕上画图,即:可以在屏幕上画出一个矩形框,双击该矩形框将截取矩形框内的屏幕。

目前在屏幕上画图的C#实现代码如下:
复制C#代码保存代码
[DllImport("User32.dll")]
public extern static System.IntPtr GetDC(System.IntPtr hWnd);

private void button19_Click(object sender, EventArgs e)
{
    System.IntPtr DesktopHandle = GetDC(System.IntPtr.Zero);
    Graphics g = Graphics.FromHdc(DesktopHandle);
    g.DrawRectangle(new Pen(Color.Red), new Rectangle(10, 10, 100, 100));
}

需要用到可恶的API,实在不想用这种方法来实现!


2、研究出QQ屏幕上画图的真相

继续研究QQ截图的功能,发现当点击“截图”按钮之后,屏幕变成静止的了,原先网页上跳动的东西都不动了,哈哈,原因很简单,QQ截取了整个屏幕,然后用这张静止的屏幕覆盖全屏,真是精妙的解决办法啊!

于是用C#实现是:
建一个子窗体ScreenForm,在窗体上放一个pictureBox和一个label控件。ScreenForm代码如下:
复制C#代码保存代码
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace copyScreen
{
    public partial class ScreenForm : Form
    {
        public ScreenForm()
        {
            InitializeComponent();
        }

        public event copyToFatherTextBox copytoFather;  //截屏完毕后交个父窗体处理截图
        public bool begin = false;   //是否开始截屏
        public bool isDoubleClick = false;
        public Point firstPoint = new Point(0, 0);  //鼠标第一点
        public Point secondPoint = new Point(0, 0);  //鼠标第二点
        public Image cachImage = null;  //用来缓存截获的屏幕
        public int halfWidth = 0;//保存屏幕一半的宽度
        public int halfHeight = 0;//保存屏幕一般的高度

        /*复制整个屏幕,并让窗体填充屏幕*/
        public void copyScreen()
        {
            Rectangle r = Screen.PrimaryScreen.Bounds;
            Image img = new Bitmap(r.Width, r.Height);
            Graphics g = Graphics.FromImage(img);
            g.CopyFromScreen(new Point(0, 0), new Point(0, 0), r.Size);

            //窗体最大化,及相关处理
            this.Width = r.Width;
            this.Height = r.Height;
            this.Left = 0;
            this.Top = 0;
            pictureBox1.Width = r.Width;
            pictureBox1.Height = r.Height;
            pictureBox1.BackgroundImage = img;
            cachImage = img;
            halfWidth = r.Width / 2;
            halfHeight = r.Height / 2;
            this.Cursor = new Cursor(GetType(), "MyCursor.cur");
        }

        private void ScreenForm_Load(object sender, EventArgs e)
        {
            copyScreen();
        }

        /*鼠标按下时开始截图*/
        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
        {
            if (!isDoubleClick)
            {
                begin = true;
                firstPoint = new Point(e.X, e.Y);
                changePoint(e.X, e.Y);
                msg.Visible = true;
            }
        }

        /*鼠标移动时显示截取区域的边框*/
        private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
        {
            if (begin)
            {
                //获取新的右下角坐标
                secondPoint = new Point(e.X, e.Y);
                int minX = Math.Min(firstPoint.X, secondPoint.X);
                int minY = Math.Min(firstPoint.Y, secondPoint.Y);
                int maxX = Math.Max(firstPoint.X, secondPoint.X);
                int maxY = Math.Max(firstPoint.Y, secondPoint.Y);

                //重新画背景图
                Image tempimage = new Bitmap(cachImage);
                Graphics g = Graphics.FromImage(tempimage);
                //画裁剪框
                g.DrawRectangle(new Pen(Color.Red), minX, minY, maxX - minX, maxY - minY);
                pictureBox1.Image = tempimage;
                //计算坐标信息
                msg.Text = "左上角坐标:(" + minX.ToString() + "," + minY.ToString() + ")/r/n";
                msg.Text += "右下角坐标:(" + maxX.ToString() + "," + maxY.ToString() + ")/r/n";
                msg.Text += "截图大小:" + (maxX - minX) + "×" + (maxY - minY) + "/r/n";
                msg.Text += "双击任意地方结束截屏!";
                changePoint((minX + maxX) / 2, (minY + maxY) / 2);
            }
        }

        /*动态调整显示信息的位置,输入参数为当前截屏鼠标位置*/
        public void changePoint(int x, int y)
        {
            if (x < halfWidth)
            {
                if (y < halfHeight)
                { msg.Top = halfHeight; msg.Left = halfWidth; }
                else
                { msg.Top = 0; msg.Left = halfWidth; }
            }
            else
            {
                if (y < halfHeight)
                { msg.Top = halfHeight; msg.Left = 0; }
                else
                { msg.Top = 0; msg.Left = 0; }
            }
        }

        /*鼠标放开时截图操作完成*/
        private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
        {
            begin = false;
            isDoubleClick = true; //之后再点击就是双击事件了
        }
        /*双击时截图时,通知父窗体完成截图操作,同时关闭本窗体*/
        private void pictureBox1_DoubleClick(object sender, EventArgs e)
        {
            if (firstPoint != secondPoint)
            {
                int minX = Math.Min(firstPoint.X, secondPoint.X);
                int minY = Math.Min(firstPoint.Y, secondPoint.Y);
                int maxX = Math.Max(firstPoint.X, secondPoint.X);
                int maxY = Math.Max(firstPoint.Y, secondPoint.Y);
                Rectangle r = new Rectangle(minX, minY, maxX - minX, maxY - minY);
                copytoFather(r);
            }
            this.Close();
            //msg.Text = r.ToString();
        }
    }
}

界面如下:
单击在新窗口中打开图片,Ctrl+滚轮缩放图片

本程序下载:CODE
http://files.cnblogs.com/tuyile006/copyscreensource.rar

演示版:Demo
http://files.cnblogs.com/tuyile006/copyscreendemo.rar
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