学步园

一个抓取电脑屏幕的小控件台程序

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Imaging;

namespace DeskRegistrar
{
    class Program
    {
        //声明一个API函数
        [System.Runtime.InteropServices.DllImportAttribute("gdi32.dll")]
        private static extern bool BitBlt(
             IntPtr hdcDest, // 目标 DC的句柄
             int nXDest,
             int nYDest,
             int nWidth,
             int nHeight,
             IntPtr hdcSrc,  // 源DC的句柄
             int nXSrc,
             int nYSrc,
             System.Int32 dwRop  // 光栅的处理数值
             );

        [System.Runtime.InteropServices.DllImportAttribute("gdi32.dll")]
        private static extern IntPtr CreateDC(
            string lpszDriver,   //   驱动名称   
            string lpszDevice,   //   设备名称   
            string lpszOutput,   //   无用，可以设定位"NULL"   
            IntPtr lpInitData    //   任意的打印机数据   
            );

        static void Main(string[] args)
        {

            System.Threading.Timer timer = new System.Threading.Timer(delegate(Object o)
            {
                IntPtr dc1 = CreateDC("DISPLAY", null, null, (IntPtr)null);
                //创建显示器的DC   
                Graphics g1 = Graphics.FromHdc(dc1);
                //由一个指定设备的句柄创建一个新的Graphics对象   
                Image MyImage = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height, g1);
                //根据屏幕大小创建一个与之相同大小的Bitmap对象   
                Graphics g2 = Graphics.FromImage(MyImage);
                //获得屏幕的句柄   
                IntPtr dc3 = g1.GetHdc();
                //获得位图的句柄   
                IntPtr dc2 = g2.GetHdc();
                //把当前屏幕捕获到位图对象中   
                BitBlt(dc2, 0, 0, Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height, dc3, 0, 0, 13369376);
                //把当前屏幕拷贝到位图中   
                g1.ReleaseHdc(dc3);
                //释放屏幕句柄   
                g2.ReleaseHdc(dc2);
                //释放位图句柄   
                MyImage.Save(AppDomain.CurrentDomain.BaseDirectory + "\\" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".jpg", ImageFormat.Jpeg);
                //MessageBox.Show("已经把当前屏幕保存到C:\\MyJpeg.jpg文件中！"); 
            }, null, 0, 3000);

            Console.Read();
        }
    }
}