用制作C＃作屏幕捕获程序

protected override void OnActivated ( EventArgs e )
{
this.Hide ( ) ;
}
[ System.Runtime.InteropServices.DllImportAttribute ( "gdi32.dll" ) ]
private 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
) ;

[ 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
) ;
public void capture ( object sender , System.EventArgs e )
{
this.Visible = false ;
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
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 ( "c:\\MyJpeg.jpg" , ImageFormat.Jpeg ) ;
MessageBox.Show ( "已经把当前屏幕保存到C:\\MyJpeg.jpg文件中！" ) ;
this.Visible = true ;
}
public void ExitSelect ( object sender , System.EventArgs e )
{
//隐藏托盘程序中的图标
TrayIcon.Visible = false ;
//关闭系统
this.Close ( ) ;
}
//清除程序中使用过的资源
public override void Dispose ( )
{
base.Dispose ( ) ;
if ( components != null )
components.Dispose ( ) ;
}
private void InitializeComponent ( )
{
//设定托盘程序的各个属性
TrayIcon = new NotifyIcon ( ) ;
TrayIcon.Icon = mNetTrayIcon ;
TrayIcon.Text = "用C#做Screen Capture程序" ;
TrayIcon.Visible = true ;
//定义一个MenuItem数组，并把此数组同时赋值给ContextMenu对象
MenuItem [ ] mnuItms = new MenuItem [ 3 ] ;
mnuItms [ 0 ] = new MenuItem ( ) ;
mnuItms [ 0 ] .Text = "捕获当前屏幕！" ;
mnuItms [ 0 ] .Click += new System.EventHandler ( this.capture ) ;
mnuItms [ 1 ] = new MenuItem ( "-" ) ;
mnuItms [ 2 ] = new MenuItem ( ) ;
mnuItms [ 2 ] .Text = "退出系统" ;
mnuItms [ 2 ] .Click += new System.EventHandler ( this.ExitSelect ) ;
mnuItms [ 2 ] .DefaultItem = true ;
notifyiconMnu = new ContextMenu ( mnuItms ) ;
TrayIcon.ContextMenu = notifyiconMnu ;
//为托盘程序加入设定好的ContextMenu对象
this.SuspendLayout ( ) ;
this.AutoScaleBaseSize = new System.Drawing.Size ( 5 , 13 ) ;
this.ClientSize = new System.Drawing.Size ( 320 , 56 ) ;
this.ControlBox = false ;
this.MaximizeBox = false ;
this.MinimizeBox = false ;
this.WindowState = System.Windows.Forms.FormWindowState.Minimized ;
this.Name = "capture" ;
this.ShowInTaskbar = false ;
this.Text = "用C#做Screen Capture程序！" ;
this.ResumeLayout ( false ) ;
}
static void Main ( )
{
Application.Run ( new Capture ( ) ) ;
}
}