c# PDF 转换成图片

1.新建项目

2.新增一个新文件夹“lib”（主要是为了存放引用的dll）

3.将“gsdll32.dll  、PDFLibNet.dll  、PDFView.dll”3个dll添加到文件夹中

4.项目添加“PDFLibNet.dll  、PDFView.dll”2个类库的引用，并将gsdll32.dll 拷贝到项目生产根目录中（bin 目录）

(注意：gsdll32.dll 是无法和其它两个dll 一样添加到项目中进行引用的，这一点我之前未能给大家作出说明，不好意思，^_^ )

5.在主界面中添加文本框“TextBox1”，浏览按钮“button1”,转换按钮“button2”和文件选择控件“OpenFileDialog1”

6.执行方式：点击浏览按钮选择一个PDF，点击“转换按钮”即可

7.源代码：Form1.cs

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.IO;

namespace PDFEditer

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        /// <summary>

        /// 将PDF 相应的页转换为图片

        /// </summary>

        /// <param name="strPDFpath">PDF 路径</param>

        /// <param name="Page">需要转换的页页码</param>

        private void GetImage(string strPDFpath,int Page)

        {

            FileInfo file=new FileInfo (strPDFpath);

            string strSavePath=file.Directory.FullName;

            byte[] ImgData = GetImgData(strPDFpath, Page);

            MemoryStream ms = new MemoryStream(ImgData, 0, ImgData.Length);

            Bitmap returnImage = (Bitmap)Bitmap.FromStream(ms);

            string strImgPath=Path.Combine(strSavePath,string.Format("PDFConvert{0}.jpg",Page));

            returnImage.Save(strImgPath);

        }

        /// <summary>

        /// 从PDF中获取首页的图片

        /// </summary>

        /// <param name="PDFPath">PDF 文件路径</param>

        /// <param name="Page">需要获取的第几页</param>

        /// <returns></returns>

        private byte[] GetImgData(string PDFPath,int Page)

        {

            System.Drawing.Image img = PDFView.ConvertPDF.PDFConvert.GetPageFromPDF(PDFPath,Page, 300, "", true);

            return GetDataByImg(img);//读取img的数据并返回

        }

        /// <summary>

        /// 将单页的PDF转换为图片

        /// </summary>

        /// <param name="_image"></param>

        /// <returns></returns>

        private byte[] GetDataByImg(System.Drawing.Image _image)

        {

            System.IO.MemoryStream Ms = new MemoryStream();

            _image.Save(Ms, System.Drawing.Imaging.ImageFormat.Jpeg);

            byte[] imgdata = new byte[Ms.Length];

            Ms.Position = 0;

            Ms.Read(imgdata, 0, Convert.ToInt32(Ms.Length));

            Ms.Close();

            return imgdata;

        }



        string Pdfpath = "";

        /// <summary>

        /// 选择需要转换的PDF

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void button1_Click(object sender, EventArgs e)

        {

            if (openFileDialog1.ShowDialog() == DialogResult.OK)

            {

                Pdfpath = openFileDialog1.FileName;

            }

            else

            {

                Pdfpath = "";

            }

            textBox1.Text = Pdfpath;

        }

        /// <summary>

        /// 转换

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void button2_Click(object sender, EventArgs e)

        {

            if (!string.IsNullOrEmpty(Pdfpath))

            {

                GetImage(Pdfpath,2);

            }

        }

    }

}

源码下载：http://u.163.com/8MJPw5bT   提取码：pe8y8a35

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