using System.Drawing.Imaging;
using System.IO;
using PDFLibNet;namespace WindowsFormsApp1
{class PDFjpg{ public enum Definition{One = 1, Two = 2, Three = 3, Four = 4, Five = 5, Six = 6, Seven = 7, Eight = 8, Nine = 9, Ten = 10}/// <summary>/// 将PDF文档转换为图片的方法/// </summary>/// <param name="pdfInputPath">PDF文件路径</param>/// <param name="imageOutputPath">图片输出路径</param>/// <param name="imageName">生成图片的名字</param>/// <param name="startPageNum">从PDF文档的第几页开始转换</param>/// <param name="endPageNum">从PDF文档的第几页开始停止转换</param>/// <param name="imageFormat">设置所需图片格式</param>/// <param name="definition">设置图片的清晰度，数字越大越清晰</param>public static void ConvertPDF2Image(string pdfInputPath, string imageOutputPath,string imageName, int startPageNum, int endPageNum, ImageFormat imageFormat, Definition definition){PDFWrapper pdfWrapper = new PDFWrapper();pdfWrapper.LoadPDF(pdfInputPath);if (!System.IO.Directory.Exists(imageOutputPath)){Directory.CreateDirectory(imageOutputPath);}// validate pageNumif (startPageNum <= 0){startPageNum = 1;}if (endPageNum > pdfWrapper.PageCount){endPageNum = pdfWrapper.PageCount;}if (startPageNum > endPageNum){int tempPageNum = startPageNum;startPageNum = endPageNum;endPageNum = startPageNum;}// start to convert each pagefor (int i = startPageNum; i <= endPageNum; i++){pdfWrapper.ExportJpg(imageOutputPath + imageName + i.ToString() + ".jpg", i, i, 180, 80);//这里可以设置输出图片的页数、大小和图片质量if (pdfWrapper.IsJpgBusy) { System.Threading.Thread.Sleep(100); }}pdfWrapper.Dispose();}}
}

            PDFjpg.ConvertPDF2Image("E:\\download\\search.pdf", "E:\\download", "test", 1, 5, ImageFormat.Jpeg, PDFjpg.Definition.One);