C# 获取桌面

              

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[System.Runtime.InteropServices.DllImport(”gdi32.dll”)]           public static extern int BitBlt(IntPtr hdcDest, int nXDest, int nYDest, int nWidth, int nHeight, IntPtr hdcSrc, int nXSrc, int nYSrc, UInt32 dwRop);         //创建桌面句柄           [System.Runtime.InteropServices.DllImportAttribute(”gdi32.dll”)]           public static extern IntPtr CreateDC(string lpszDriver, string lpszDevice, string lpszOutput, int lpInitData);           [System.Runtime.InteropServices.DllImport(”gdi32.dll”)]           public static extern IntPtr CreateCompatibleDC(IntPtr hdc);           //转换为本地的图像资源           [System.Runtime.InteropServices.DllImport(”gdi32.dll”)]           public static extern IntPtr CreateCompatibleBitmap(IntPtr hdc, int nWidth, int nHeight);           [System.Runtime.InteropServices.DllImport(”gdi32.dll”)]           public static extern IntPtr SelectObject(IntPtr hdc, IntPtr hgdiobj);           [System.Runtime.InteropServices.DllImport(”gdi32.dll”)]           public static extern int DeleteDC(IntPtr hdc);           //释放用过的设备句柄           [DllImport(”user32.dll”)]           public static extern bool ReleaseDC(            IntPtr hwnd, IntPtr hdc            );           //释放用过的画笔等资源           [DllImport(”gdi32.dll”)]           public static extern bool DeleteObject(             IntPtr hdc            );               /// <summary>           /// 截取屏幕图像           /// </summary>           /// <param name=”Width”>宽</param>           /// <param name=”Height”>高</param>           /// <param name=”x”>x坐标(全屏时候为0)</param>           /// <param name=”y”>y坐标(全屏时候为0)</param>           /// <returns></returns>           public Bitmap fullphoto(int Width,int Height,int x,int y)           {               Bitmap bitmap;               //try               //{                   IntPtr hScreenDc = CreateDC(”DISPLAY”, null, null, 0); // 创建桌面句柄                   IntPtr hMemDc = CreateCompatibleDC(hScreenDc); // 创建与桌面句柄相关连的内存DC                   IntPtr hBitmap = CreateCompatibleBitmap(hScreenDc, Width, Height);                     IntPtr hOldBitmap = SelectObject(hMemDc, hBitmap);                   BitBlt(hMemDc, x, y, Width, Height, hScreenDc, x, y, (UInt32)0xcc0020);                   IntPtr map = SelectObject(hMemDc, hOldBitmap);                   bitmap = Bitmap.FromHbitmap(map);                    ReleaseDC(hBitmap, hScreenDc);                   DeleteDC(hScreenDc);//删除用过的对象                   DeleteDC(hMemDc);//删除用过的对象                   DeleteDC(hOldBitmap);                   DeleteObject(hBitmap);                                                    //}               //catch (Exception wx)               //{               //    return null;                   //}                   // number= number +1;                   // bitmap.Save(”screen” + number + “.bmp”);                               return bitmap;           }