生成image类，video，pdf提取图像

/// <summary>
		/// 取得缩略图
		/// </summary>
		/// <param name="sourceImg"></param>
		/// <param name="width"></param>
		/// <param name="height"></param>
		/// <returns></returns>
		public static System.Drawing.Image GetThumb(System.Drawing.Image sourceImg, int width, int height)
		{
			System.Drawing.Image targetImg = new Bitmap(width, height);
			using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(targetImg))
			{
				g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
				g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
				g.Clear(Color.White);
				g.DrawImage(sourceImg, new Rectangle(0, 0, width, height), new Rectangle(0, 0, sourceImg.Width, sourceImg.Height), GraphicsUnit.Pixel);
				g.Dispose();
			}

			return targetImg;
		}
		//#region pdf截图

		///// <summary>
		///// 
		///// </summary>
		///// <param name="pdfFilePath"></param>
		///// <param name="imgOutPath"></param>
		///// <returns></returns>//这个在xp，win7可以用，但是在win2003下报访问剪切板失败的异常，求解
		//public static string ConvertPdf2Image(string pdfFilePath, string imgOutPath)
		//{
		//    if (!System.IO.File.Exists(pdfFilePath))
		//    {
		//        return string.Empty;
		//    }
		//    string msg = string.Empty;
		//    try
		//    {
		//        ConvertPdf2Image(pdfFilePath, imgOutPath, 0, 1, null, 1);
		//        if (System.IO.File.Exists(imgOutPath))
		//        {
		//            return imgOutPath;
		//        }
		//        else
		//            return string.Empty;
		//    }
		//    catch (System.Exception ex)
		//    {
		//        
		//        return string.Empty;
		//    }

		//}
		/////// <summary>
		/////// pdf转image缩略图
		/////// </summary>
		/////// <param name="pdfFilePath"></param>
		/////// <param name="imageDirectoryPath"></param>
		/////// <param name="beginPageNum"></param>
		/////// <param name="endPageNum"></param>
		/////// <param name="format"></param>
		/////// <param name="zoom"></param>//安装Acrobat软件100多M大小
		////public static void ConvertPdf2Image(string pdfFilePath, string imageDirectoryPath, int beginPageNum, int endPageNum, ImageFormat format, double zoom)
		////{
		////    if (!System.IO.File.Exists(pdfFilePath))
		////    {
		////        return;
		////    }
		////    zoom = 1;
		////    Acrobat.CAcroPDDoc pdfDoc = null;
		////    Acrobat.CAcroPDPage pdfPage = null;
		////    Acrobat.CAcroRect pdfRect = null;
		////    Acrobat.CAcroPoint pdfPoint = null;

		////    //生成操作Pdf文件的Com对象
		////    //            pdfDoc = (Acrobat.CAcroPDDoc)Microsoft.VisualBasic.Interaction.CreateObject("AcroExch.PDDoc", "");
		////    var CreatePdf = Microsoft.VisualBasic.Interaction.CreateObject("AcroExch.PDDoc", "");
		////    pdfDoc = (Acrobat.CAcroPDDoc)CreatePdf;

		////    //检查输入参数
		////    if (!pdfDoc.Open(pdfFilePath))
		////    {
		////        throw new FileNotFoundException(string.Format("源文件{0}不存在！", pdfFilePath));
		////    }
		////    string dir = System.IO.Path.GetDirectoryName(imageDirectoryPath);
		////    if (!Directory.Exists(dir))
		////    {
		////        Directory.CreateDirectory(dir);
		////    }

		////    if (beginPageNum <= 0)
		////    {
		////        beginPageNum = 1;
		////    }

		////    if (endPageNum > pdfDoc.GetNumPages() || endPageNum <= 0)
		////    {
		////        endPageNum = pdfDoc.GetNumPages();
		////    }

		////    if (beginPageNum > endPageNum)
		////    {
		////        throw new ArgumentException("参数\"beginPageNum\"必须小于\"endPageNum\"！");
		////    }

		////    if (format == null)
		////    {
		////        format = ImageFormat.Jpeg;
		////    }

		////    if (zoom <= 0)
		////    {
		////        zoom = 1;
		////    }

		////    //转换
		////    for (int i = beginPageNum; i <= endPageNum; i++)
		////    {
		////        //取出当前页
		////        pdfPage = (Acrobat.CAcroPDPage)pdfDoc.AcquirePage(i - 1);
		////        //得到当前页的大小
		////        pdfPoint = (Acrobat.CAcroPoint)pdfPage.GetSize();
		////        //生成一个页的裁剪区矩形对象
		////        pdfRect = (Acrobat.CAcroRect)Microsoft.VisualBasic.Interaction.CreateObject("AcroExch.Rect", "");

		////        //计算当前页经缩放后的实际宽度和高度,zoom==1时，保持原比例大小
		////        int imgWidth = (int)((double)pdfPoint.x * zoom);
		////        int imgHeight = (int)((double)pdfPoint.y * zoom);

		////        //设置裁剪矩形的大小为当前页的大小
		////        pdfRect.Left = 0;
		////        pdfRect.right = (short)imgWidth;
		////        pdfRect.Top = 0;
		////        pdfRect.bottom = (short)imgHeight;
				
		////        //将当前页的裁剪区的内容编成图片后复制到剪贴板中
		////        Thread cbThread = new Thread(new ThreadStart(delegate
		////        {
		////            try
		////            {
		////                Clipboard.Clear();
		////                pdfPage.CopyToClipboard(pdfRect, 0, 0, (short)(100 * zoom));
		////                IDataObject clipboardData = Clipboard.GetDataObject();
		////                //检查剪贴板中的对象是否是图片，如果是图片则将其保存为指定格式的图片文件
		////                if (clipboardData.GetDataPresent(DataFormats.Bitmap))
		////                {

		////                    Bitmap pdfBitmap = (Bitmap)clipboardData.GetData(DataFormats.Bitmap);
		////                    pdfBitmap.Save(imageDirectoryPath,ImageFormat.Jpeg);
		////                    pdfBitmap.Dispose();
		////                }
		////                //System.Drawing.Image img = GetThumb(Clipboard.GetImage(), 200, 150);
		////                //if (img != null)
		////                //{
		////                //    img.Save(imageDirectoryPath);
		////                //}
		////            }
		////            catch (System.Exception ex)
		////            {
		////                
		////            }
					
		////        }));
		////        cbThread.ApartmentState = ApartmentState.STA;//在老外那里看到asp.net不正常，用这个方法解决这个问题
		////        cbThread.Start();
		////        cbThread.Join();
		////    }

		////    //关闭和释放相关COM对象
		////    pdfDoc.Close();
		////    Marshal.ReleaseComObject(pdfRect);
		////    Marshal.ReleaseComObject(pdfPoint);
		////    Marshal.ReleaseComObject(pdfPage);
		////    Marshal.ReleaseComObject(pdfDoc);

		////}
		//#endregion

		#region 视频格式mp4,3gp,flv截图。注意swf除外
		/// <summary>
		/// 视频格式mp4,3gp,flv截图。注意swf除外
		/// </summary>
		/// <param name="vFileName"></param>
		/// <param name="outImgPath"></param>
		/// <returns></returns>
		public static string ConvertVideo2Image(string vFileName, string outImgPath)
		{
			int[] size = WebConfiguration.ConverterSetting.GetThumbSize();
		   return ConvertVideo2Image( vFileName, outImgPath,size[0],size[1]);
		}
		/// <summary>
		/// 视频格式mp4,3gp,flv截图。注意swf除外
		/// </summary>
		/// <param name="vFileName"></param>
		/// <param name="outImgPath"></param>
		/// <param name="width"></param>
		/// <param name="height"></param>
		/// <returns></returns>
		public  static string ConvertVideo2Image(string vFileName,string outImgPath,int width,int height)
		{
			//取得ffmpeg.exe的路径,路径配置在Web.Config中,如:<add key="ffmpeg" value="E:\ffmpeg\ffmpeg.exe" />
			string ffmpeg = WebConfiguration.ConverterSetting.GetFfmpegExePath();// System.Configuration.ConfigurationSettings.AppSettings["ffmpeg"];
			if ((!System.IO.File.Exists(ffmpeg)) || (!System.IO.File.Exists(vFileName)))
			{
				return "error:not find the ffmpeg exe";
			}
			
			string flv_img = outImgPath;
			//截图的尺寸大小,配置在Web.Config中,如:<add key="CatchFlvImgSize" value="240x180" />
			string FlvImgSize = width+"x"+height;
			System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo(ffmpeg);
			startInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
			//此处组合成ffmpeg.exe文件需要的参数即可,此处命令在ffmpeg 0.4.9调试通过
			startInfo.Arguments = " -i " + vFileName + " -y -f image2 -t 0.001 -ss 4 -s " + FlvImgSize + " " + outImgPath;
			try
			{
				System.Diagnostics.Process.Start(startInfo);
			}
			catch
			{
				return "error:catch";
			}
			///注意:图片截取成功后,数据由内存缓存写到磁盘需要时间较长,大概在3,4秒甚至更长;
			///这儿需要延时后再检测,我服务器延时8秒,即如果超过8秒图片仍不存在,认为截图失败;
			///此处略去延时代码.如有那位知道如何捕捉ffmpeg.exe截图失败消息,请告知,先谢过!
			Thread.Sleep(500);
			if (System.IO.File.Exists(flv_img))
			{
				return flv_img;
			}
			return "error:not create cath img";
		}
		#endregion


		#region pdf提取图像
		/// <summary>
		/// 从pdf中提取第一页，转为图像 
		/// </summary>
		/// <param name="InputFile"></param>
		/// <param name="filename"></param>
		/// <returns></returns>
		public static string ConvertPdf2Image(string InputPdfFilePath , string OutImgFilePath)
		{
			string tempImg = System.IO.Path.GetDirectoryName(OutImgFilePath)+"\\" + System.IO.Path.GetFileNameWithoutExtension(OutImgFilePath) + "#temp.jpg";
			string msg = ConvertPdf2Image(InputPdfFilePath, false, tempImg, "-dSAFER -dBATCH -dNOPAUSE -r150 -sDEVICE=jpeg -dGraphicsAlphaBits=4 -dFirstPage=1 -dLastPage=1 ");
			if (System.IO.File.Exists(tempImg))
			{
				try
				{
					int[] size = WebConfiguration.ConverterSetting.GetThumbSize();
					BLL.Common.Image.GetThumb(System.Drawing.Image.FromFile(tempImg), size[0], size[1]).Save(OutImgFilePath);
					if (System.IO.File.Exists(tempImg))//删除临时文件
					{
						System.IO.File.Delete(tempImg);
					}
				}
				catch (System.Exception ex)
				{
					return "error:" + ex.Message;
				}
				
			}
			if (msg.StartsWith("error"))
			{
				return msg;
			}
			else
				return OutImgFilePath;
		}

		private static string ConvertPdf2Image(string InputFile, bool deletePDF, string filename, string Arguments)
		{
			string msg = string.Empty;
			string OutputFile = filename;
			string ExtOut = Path.GetExtension(OutputFile);
			string partOut = OutputFile.Remove(OutputFile.Length - ExtOut.Length, ExtOut.Length);
			ProcessStartInfo info = new ProcessStartInfo();
			info.CreateNoWindow = true;
			info.WindowStyle = ProcessWindowStyle.Hidden;
			info.WorkingDirectory = WebConfiguration.ConverterSetting.GetPdf2ImageConverterPath();//System.Configuration.ConfigurationSettings.AppSettings["GhostScriptView"];
			info.Arguments = Arguments + @" -sOutputFile=" + OutputFile + "  " + InputFile;
			info.FileName = @"gswin32c.exe";//下载gs
			Process subProcess = new Process();
			subProcess.StartInfo = info;
			subProcess.Start();
			subProcess.WaitForExit(int.MaxValue);
			if (System.IO.File.Exists(filename))
			{
				return filename;
			}

			return "error:not create cath img";
		}

		private int ReadPDFCount(string InputFile)
		{
			FileStream fs = new FileStream(InputFile, FileMode.Open, FileAccess.Read);
			StreamReader r = new StreamReader(fs);
			string pdfText = r.ReadToEnd();
			// 一旦获取了pdf文本，我们需要做的就是使用正则表达式计算："/Type /Page" 标记出现的次数。
			Regex rx1 = new Regex(@"/Type\s*/Page[^s]");
			MatchCollection matches = rx1.Matches(pdfText);

			return Convert.ToInt32(matches.Count);
		}
		#endregion