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   源码介绍

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   第三方dll  对pdf进行截图，并将每页的截图 保存成图片

using Aspose.Pdf;
using Aspose.Pdf.Devices;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace PDFTest
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Aspose.Pdf.License li = new Aspose.Pdf.License();
            string path = Application.StartupPath   "\\License.lic";
            li.SetLicense(path);
            string sPath = Application.StartupPath "\\test.pdf";
            string imageOutputDirPath = Application.StartupPath "\\";
            
            Aspose.Pdf.Document doc = new Aspose.Pdf.Document(sPath);
            int resolution = 700;//像素大小 128-1024
            if (doc == null)
            {
                throw new Exception("pdf文件无效或者pdf文件被加密！");
            }

            if (imageOutputDirPath.Trim().Length == 0)
            {
                imageOutputDirPath = Path.GetDirectoryName(sPath);
            }

            if (!Directory.Exists(imageOutputDirPath))
            {
                Directory.CreateDirectory(imageOutputDirPath);
            }

            //开始页
            int  startPageNum = 1;

            //结束页
            int endPageNum = doc.Pages.Count;
           
            //
            if (startPageNum > endPageNum)
            {
                int tempPageNum = startPageNum; startPageNum = endPageNum; endPageNum = startPageNum;
            }
 

            string imageNamePrefix = Path.GetFileNameWithoutExtension(sPath);
            for (int i = startPageNum; i <= endPageNum; i  )
            {
                MemoryStream stream = new MemoryStream();
                string imgPath = Path.Combine(imageOutputDirPath, imageNamePrefix)   "_"   i.ToString("000")   ".jpg";
                Aspose.Pdf.Devices.Resolution reso = new Aspose.Pdf.Devices.Resolution(resolution);
                Aspose.Pdf.Devices.JpegDevice jpegDevice = new Aspose.Pdf.Devices.JpegDevice(reso, 100);
                jpegDevice.Process(doc.Pages[i], stream);

                
                System.Drawing.Image img = System.Drawing.Image.FromStream(stream);
                Bitmap bm = new Bitmap(img);
                bm.Save(imgPath, ImageFormat.Jpeg);
                img.Dispose();
                stream.Dispose();
                bm.Dispose();
 
       
            }

            MessageBox.Show("转换成功");
 
    
        }
    }
}