抓图软件设计

主要内容是进行全屏抓图和窗口抓图

本例功能是每隔10秒对当前窗口(或一个固定的窗口)进行抓图，并保存到文件中。

 

…… 系统产生代码略

using System.Runtime.InteropServices;//add

namespace 截屏幕图

{

       /// <summary>

       /// Form1 的摘要说明。

       /// </summary>

       internal class NativeMethods

       {

              [DllImport("user32.dll")]

              public extern static IntPtr GetDesktopWindow();

              [System.Runtime.InteropServices.DllImport("user32.dll")]

              public static extern IntPtr GetWindowDC(IntPtr hwnd);

              [System.Runtime.InteropServices.DllImport("gdi32.dll")]

              public static extern UInt64 BitBlt

                     (IntPtr hDestDC,

                     int x, int y, int nWidth,   int nHeight,

                     IntPtr hSrcDC,

                     int xSrc,        int ySrc,        System.Int32 dwRop);

       }

       public class Form1 : System.Windows.Forms.Form

       {

        …… 系统产生代码略

          [STAThread]

              static void Main()

              {

                     Application.Run(new Form1());

              }

        //整个屏幕

              public void SaveScreen(string filename)

              {

                     Image myImage = new Bitmap(Screen.PrimaryScreen.Bounds.Width,

                     Screen.PrimaryScreen.Bounds.Height);

                     Graphics gr1 = Graphics.FromImage(myImage);

                     IntPtr dc1 = gr1.GetHdc();

                     IntPtr dc2 = GetWindowDC(NativeMethods.GetDesktopWindow());

                     BitBlt(dc1, 0, 0, Screen.PrimaryScreen.Bounds.Width,

                            Screen.PrimaryScreen.Bounds.Height, dc2, 0, 0, 13369376);

                     gr1.ReleaseHdc(dc1);

                     myImage.Save(filename);

              }

              //当前窗口

              public void SaveWindowsScreen(string filename)

              {

                     Image newImage =new Bitmap(this.Width, this.Height);

                     Graphics newGraphics = Graphics.FromImage(newImage);

                     IntPtr ImageDc = newGraphics.GetHdc();

                     IntPtr SourceDc = GetWindowDC(this.Handle);

                     BitBlt(ImageDc, 0, 0, this.Width, this.Height, SourceDc, 0, 0, 13369376);

                     newGraphics.ReleaseHdc(ImageDc);

                     newImage.Save(filename);

              }

              private void Form1_Load(object sender, System.EventArgs e)

              {

                     //this.WindowState =FormWindowState.Minimized ;

                     SaveScreen("screenshot.jpg");                   

              }

              private void timer1_Tick(object sender, System.EventArgs e)

              {

                     label1.Text=DateTime.Now.ToString();

                     n=n+1;

                     SaveWindowsScreen("screenshot"+n.ToString()+".jpg");

              }

       }    

}