用c#抓屏

using System;

using System.Windows.Forms;

using System.Drawing;

using System.Drawing.Imaging;

using System.Runtime.InteropServices;

namespace PrintScreen

{

//一部分代碼來自網絡

[StructLayout(LayoutKind.Sequential)]

public struct RECT

{

public int left;

public int top;

public int right;

public int bottom;

}

//封裝一部分api的類

public class apitmp

{

[DllImport("user32.dll")]

public static extern bool GetCursorPos(ref Point lpPoint);

[DllImport("user32.dll")]

public static extern int WindowFromPoint( Point lpPoint);

[DllImport("user32.dll")]

public static extern IntPtr GetDesktopWindow();

[DllImport("user32.dll")]

public static extern int GetForegroundWindow();

[DllImport("user32.dll")]

public static extern int GetWindowRect(int hwnd, ref RECT rc);

[DllImport("user32.dll")]

public static extern int GetWindowDC( int hwnd);

[DllImport("Gdi32.dll")]

public static extern bool BitBlt (

IntPtr hdcDest , // 目标裝置的句柄

int nXDest , // 目标對象的左上角的X坐标

int nYDest , // 目标對象的左上角的X坐标

int nWidth , // 目标對象的矩形的寬度

int nHeight , // 目标對象的矩形的長度

IntPtr hdcSrc , // 源裝置的句柄

int nXSrc , // 源對象的左上角的X坐标

int nYSrc , // 源對象的左上角的X坐标

System.Int32 dwRop // 光栅的操作值

) ;

[DllImportAttribute ( "gdi32.dll" ) ]

public static extern IntPtr CreateDC (

string lpszDriver , // 驅動名稱

string lpszDevice , // 裝置名稱

string lpszOutput , // 無用，可以設定位"NULL"

IntPtr lpInitData // 任意的列印機資料

) ;

}

//封裝各種抓屏操作的類

public class UCapture

{

//獲得螢幕指定區域

public Bitmap getscreen(int left,int top ,int width,int height)

{

IntPtr dc1 = apitmp.CreateDC ( "DISPLAY" , null , null , ( IntPtr ) null ) ;

Graphics newGraphics = Graphics.FromHdc(dc1);

Bitmap img = new Bitmap(width , height ,newGraphics);

Graphics thisGraphics = Graphics.FromImage(img);

IntPtr dc2 =thisGraphics.GetHdc();

IntPtr dc3 = newGraphics.GetHdc();

apitmp.BitBlt(dc2,0,0,width , height ,dc3,left,top,13369376);

thisGraphics.ReleaseHdc(dc2);

newGraphics.ReleaseHdc(dc3);

return img;

}

//獲得整個螢幕

public Bitmap getfullscreen()

{

return getscreen(0,0,Screen.PrimaryScreen.Bounds.Width,Screen.PrimaryScreen.Bounds.Height);

}

//抓取句柄所指視窗

public Bitmap getscreenfromhandle(int hwnd)

{

RECT rc = new RECT();

apitmp.GetWindowRect(hwnd, ref rc);

return getscreen(rc.left,rc.top,rc.right-rc.left,rc.bottom-rc.top);

}

//抓取活動視窗

public Bitmap getscreenfromactivewindow()

{

int handle = apitmp.GetForegroundWindow();

return getscreenfromhandle(handle);

}

//儲存成各種格式

public string savepic(Bitmap bmp)

{

SaveFileDialog saveDialog = new SaveFileDialog();

saveDialog.Filter = "位圖檔案 (*.bmp)|*.bmp|jpg檔案 (*.jpg)|*.jpg|gif檔案 (*.gif)|*.gif|tiff檔案 (*.tiff)|*.tiff|"+

"emf檔案 (*.emf)|*.emf|圖示檔案 (*.ico)|*.ico|wmf檔案 (*.wmf)|*.wmf|png檔案 (*.png)|*.png";

saveDialog.DefaultExt="*.bmp";

if(saveDialog.ShowDialog() == DialogResult.OK)

{

string ext = saveDialog.FileName.Substring(saveDialog.FileName.Length-4,4);

switch( ext)

{

case ".bmp":

bmp.Save(saveDialog.FileName,ImageFormat.Bmp);

break;

case ".gif":

bmp.Save(saveDialog.FileName,ImageFormat.Gif);

break;

case ".jpg":

bmp.Save(saveDialog.FileName,ImageFormat.Jpeg);

break;

case ".emf":

bmp.Save(saveDialog.FileName,ImageFormat.Emf);

break;

case ".ico":

bmp.Save(saveDialog.FileName,ImageFormat.Icon);

break;

case ".wmf":

bmp.Save(saveDialog.FileName,ImageFormat.Wmf);

break;

case ".png":

bmp.Save(saveDialog.FileName,ImageFormat.Png);

break;

case ".tiff":

bmp.Save(saveDialog.FileName,ImageFormat.Tiff);

break;

default :

return "";

}

return saveDialog.FileName;

}

return "";

}

}

}