.NET操作PDF与IMAGE互转的简单方法

首先，需要两个工具Z：1.itextsharp.dll；2.gswin32c.exe(依赖gsdll32.dll)

第一个库用于将图片生成到PDF文件

第二个工具用于解析PDF文件成图片

生成PDF文件代码如下：

/// <summary>
        /// 将图片生成到PDF文件
        /// </summary>
        /// <param name="targetFile">目标文件</param>
        /// <param name="images">图片源</param>
        /// <param name="pageWidth">期望的PDF页面宽度</param>
        /// <param name="pageHeight">期望的PDF页面高度</param>
        public void Save(string targetFile,List<string> images,int pageWidth,int pageHeight)
        {
            var document = new Document();
            try
            {
                document.SetPageSize(new Rectangle(0, 0, pageWidth, pageHeight));
                document.SetMargins(0, 0, 0, 0);
                PdfWriter.GetInstance(document, new FileStream(targetFile, FileMode.Create));
                document.Open();

foreach (var imageFile in images)
                {
                    Image wmf = Image.GetInstance(imageFile);
                    wmf.ScaleAbsolute(pageWidth, pageHeight);
                    document.Add(wmf);
                }
            }
            finally
            {
                document.Close();
            }
        }

解析PDF文件需要把工具复制到安装目录下，代码如下：

/// <summary>
        /// 解析PDF文件为图片列表
        /// </summary>
        /// <param name="fileName">待解析的PDF文件</param>
        /// <param name="tempDir">临时目录</param>
        /// <returns></returns>
        public static void Resolve(string fileName, string tempDir)
        {
            List<string> imageList = new List<string>();

//此工具对PDF文件名要求为英文
            var newFileName = tempDir + "\\" + Guid.NewGuid() + Path.GetExtension(fileName);
            File.Copy(fileName, newFileName);
            fileName = newFileName;

string name = Path.GetFileNameWithoutExtension(fileName);
            string folder = tempDir + "\\" + Guid.NewGuid() + "\\";
            string outputPath = folder;
            Directory.CreateDirectory(outputPath);
            outputPath = outputPath + name + "-" + "%08d.jpg";

var info = new ProcessStartInfo
            {
                CreateNoWindow = true,
                WindowStyle = ProcessWindowStyle.Hidden,
                WorkingDirectory = Path.Combine(AppDomain.CurrentDomain.SetupInformation.ApplicationBase, "PDF"),

　　　　　  //设置命令行参数
                Arguments = "-dSAFER -dBATCH -dNOPAUSE -r150 -sDEVICE=jpeg -dGraphicsAlphaBits=4 -sOutputFile=" +
                            "\"" + outputPath + "\"" + " " + "\"" + fileName + "\"",
                FileName = @"gswin32c.exe"
            };

var subProcess = new Process { StartInfo = info };
            subProcess.Start();
            subProcess.WaitForExit(int.MaxValue); 
        }

Over.