• 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

    如果下不了,发邮件到我邮箱 luowanli-881224@163.com:    一般会在1-2日内回复,特殊情况除外

     

     

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  • 原文地址:https://www.cnblogs.com/luowanli/p/2641185.html
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