www.pudn.com > ImageCapture.rar > ImageCapture.cs, change:2005-01-18,size:5245b

using System; 
using System.Drawing; 
using System.Drawing.Imaging; 
using System.Windows.Forms; 
using System.Runtime.InteropServices; 
 
namespace Graphic 
{ 
	public class ImageCapture 
	{ 
		public static Bitmap GetPartScreen(Graphics g, int width, int height) 
		{ 
			Bitmap bmp = new Bitmap(width, height, g);  
			Graphics g2 = Graphics.FromImage(bmp); 
			IntPtr dc1 = g.GetHdc();//获得窗体的上下文设备  
			IntPtr dc2 = g2.GetHdc();//获得位图文件的上下文设备  
			BitBlt(dc2, 0, 0, width, height, dc1, 0, 0, (UInt32)0xcc0020);//写入到位图  
			g.ReleaseHdc(dc1); 
			g2.ReleaseHdc(dc2); 
			return bmp; 
		} 
 
		public static Bitmap GetFullScreen() 
		{ 
			IntPtr dc1 = CreateDC("DISPLAY", null, null, (IntPtr)null); 
			int width = System.Windows.Forms.Screen.PrimaryScreen.Bounds.Width; 
			int height = System.Windows.Forms.Screen.PrimaryScreen.Bounds.Height; 
			Graphics g1 = Graphics.FromHdc(dc1); 
			Bitmap bmp = new Bitmap(width, height, g1); 
			Graphics g2 = Graphics.FromImage (bmp) ; 
			//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, width, height, dc1, 0, 0, (UInt32)0xcc0020);//写入到位图  
			//释放屏幕句柄 
			g1.ReleaseHdc (dc3) ; 
			g2.ReleaseHdc (dc2) ; 
			return bmp; 
		} 
 
		public static Bitmap GetWindow(IntPtr hWnd) 
		{ 
			IntPtr hscrdc = GetWindowDC(hWnd); 
			Control control = Control.FromHandle(hWnd); 
			IntPtr hbitmap = CreateCompatibleBitmap(hscrdc, control.Width, control.Height); 
			IntPtr hmemdc = CreateCompatibleDC(hscrdc); 
			SelectObject(hmemdc, hbitmap); 
			PrintWindow(hWnd, hmemdc, 0); 
			Bitmap bmp = Bitmap.FromHbitmap(hbitmap); 
			DeleteDC(hscrdc);//删除用过的对象 
			DeleteDC(hmemdc);//删除用过的对象 
			return bmp; 
		} 
 
		public static Guid GetEncoderClsid(string format) 
		{ 
			Guid picGUID = new Guid(); 
			ImageCodecInfo[] pImageCodecInfo; 
			//获取编码器信息 
			pImageCodecInfo = ImageCodecInfo.GetImageEncoders(); 
			//查找指定格式文件的编码器信息 
			for(int i = 0; i < pImageCodecInfo.GetLength(0); ++i) 
			{ 
				//MimeType:编码方式的具体描述 
				if(format.CompareTo(pImageCodecInfo[i].MimeType.ToString()) == 0) 
				{ 
					picGUID = pImageCodecInfo[i].Clsid; 
				} 
			} 
			return picGUID; 
		} 
 
		public static ImageCodecInfo GetEncoderInfo(string mimeType) 
		{ 
			ImageCodecInfo[] encoders = ImageCodecInfo.GetImageEncoders(); 
			for(int i = 0; i < encoders.Length; ++i) 
			{ 
				if(encoders[i].MimeType == mimeType) 
					return encoders[i]; 
			} 
			return null; 
		} 
 
		public static bool SaveJPEG(string fileName, Bitmap bmp, long quality) 
		{ 
			ImageCodecInfo myImageCodecInfo = GetEncoderInfo("image/jpeg"); 
			Encoder myEncoder= Encoder.Quality; 
			EncoderParameter myEncoderParameter = new EncoderParameter(myEncoder, quality); 
			EncoderParameters myEncoderParameters = new EncoderParameters(1); 
			myEncoderParameters.Param[0] = myEncoderParameter; 
			try 
			{ 
				bmp.Save(fileName, myImageCodecInfo, myEncoderParameters); 
				return true; 
			} 
			catch 
			{ 
				return false; 
			} 
		} 
 
		[DllImport("gdi32.dll")] 
		public static extern IntPtr CreateDC( 
			string lpszDriver,        // driver name驱动名 
			string lpszDevice,        // device name设备名 
			string lpszOutput,        // not used; should be NULL 
			IntPtr lpInitData  // optional printer data 
			); 
		[DllImport("gdi32.dll")] 
		public static extern int BitBlt( 
			IntPtr hdcDest, // handle to destination DC目标设备的句柄 
			int nXDest,  // x-coord of destination upper-left corner目标对象的左上角的X坐标 
			int nYDest,  // y-coord of destination upper-left corner目标对象的左上角的Y坐标 
			int nWidth,  // width of destination rectangle目标对象的矩形宽度 
			int nHeight, // height of destination rectangle目标对象的矩形长度 
			IntPtr hdcSrc,  // handle to source DC源设备的句柄 
			int nXSrc,   // x-coordinate of source upper-left corner源对象的左上角的X坐标 
			int nYSrc,   // y-coordinate of source upper-left corner源对象的左上角的Y坐标 
			UInt32 dwRop  // raster operation code光栅的操作值 
			); 
 
		[DllImport("gdi32.dll")] 
		public static extern IntPtr CreateCompatibleDC( 
			IntPtr hdc // handle to DC 
			); 
 
		[DllImport("gdi32.dll")] 
		public static extern IntPtr CreateCompatibleBitmap( 
			IntPtr hdc,        // handle to DC 
			int nWidth,     // width of bitmap, in pixels 
			int nHeight     // height of bitmap, in pixels 
			); 
 
		[DllImport("gdi32.dll")] 
		public static extern IntPtr SelectObject( 
			IntPtr hdc,          // handle to DC 
			IntPtr hgdiobj   // handle to object 
			); 
 
		[DllImport("gdi32.dll")] 
		public static extern int DeleteDC( 
			IntPtr hdc          // handle to DC 
			); 
 
		[DllImport("user32.dll")] 
		public static extern bool PrintWindow( 
			IntPtr hwnd,               // Window to copy,Handle to the window that will be copied.  
			IntPtr  hdcBlt,             // HDC to print into,Handle to the device context.  
			UInt32 nFlags              // Optional flags,Specifies the drawing options. It can be one of the following values.  
			); 
 
		[DllImport("user32.dll")] 
		public static extern IntPtr GetWindowDC( 
			IntPtr hwnd 
			); 
	} 
}