[C#]全屏拷贝代码

 

要先声明下：这段代码是我转贴过来的。本来作为资料，但是居然还是可以搜索到。优快云的blog看来还是有bug啊。另外，我将文章类型改为“转贴”，但是似乎文章的头上依然顶着个“原”字。让人也无可奈何。

[System.Runtime.InteropServices.DllImportAttribute("gdi32.dll")]
        public 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 
         );

        public  Bitmap windowFullScreen()//全屏截图程序
        ...{
            //建立屏幕Graphics
            Graphics grpScreen = Graphics.FromHwnd(IntPtr.Zero);
            //根据屏幕大小建立位图
            Bitmap bitmap = new Bitmap(System.Windows.Forms.Screen.PrimaryScreen.Bounds.Width, System.Windows.Forms.Screen.PrimaryScreen.Bounds.Height, grpScreen);
            //建立位图相关Graphics
            Graphics grpBitmap = Graphics.FromImage(bitmap);
            //建立屏幕上下文
            IntPtr hdcScreen = grpScreen.GetHdc();
            //建立位图上下文
            IntPtr hdcBitmap = grpBitmap.GetHdc();
            //将屏幕捕获保存在图位中
            BitBlt(hdcBitmap, 0, 0, bitmap.Width, bitmap.Height, hdcScreen, 0, 0, 0x00CC0020);
            //关闭位图句柄
            grpBitmap.ReleaseHdc(hdcBitmap);
            //关闭屏幕句柄
            grpScreen.ReleaseHdc(hdcScreen);
            //释放位图对像
            grpBitmap.Dispose();
            //释放屏幕对像
            grpScreen.Dispose();

            //返回捕获位图
            return bitmap;
        }

        public void save(Image image)//保存文件程序
        ...{
            
            bool isSave = true;
            SaveFileDialog saveImageDialog = new SaveFileDialog();
            saveImageDialog.Title = "Capture screen image save dialog";
            saveImageDialog.Filter = @"jpeg|*.jpg|bmp|*.bmp|gif|*.gif";

            if (saveImageDialog.ShowDialog() == DialogResult.OK)
            ...{
                string fileName = saveImageDialog.FileName.ToString();

                if (fileName != "" && fileName != null)
                ...{
                    string fileExtName = fileName.Substring(fileName.LastIndexOf(".") + 1).ToString();

                    System.Drawing.Imaging.ImageFormat imgformat = null;

                    if (fileExtName != "")
                    ...{
                        switch (fileExtName)
                        ...{
                            case "jpg":
                                imgformat = System.Drawing.Imaging.ImageFormat.Jpeg;
                                break;
                            case "bmp":
                                imgformat = System.Drawing.Imaging.ImageFormat.Bmp;
                                break;
                            case "gif":
                                imgformat = System.Drawing.Imaging.ImageFormat.Gif;
                                break;
                            default:
                                MessageBox.Show("只能存取为: jpg,bmp,gif 格式");
                                isSave = false;
                                break;
                        }

                    }

                    //默认保存为JPG格式
                    if (imgformat == null)
                    ...{
                        imgformat = System.Drawing.Imaging.ImageFormat.Jpeg;
                    }

                    if (isSave)
                    ...{
                        try
                        ...{
                            image.Save(fileName, imgformat);
                            MessageBox.Show("图片已经成功保存!~~");
                        }
                        catch
                        ...{
                            MessageBox.Show("保存失败,你还没有截取过图片或已经清空图片!");
                        }
                    }

                }

            }
//            return image;
        }