PDF另存为图片的一个方法

说明

有时需要把PDF的每一页另存为图片。用Devexpress可以很方便的完成这个功能。

窗体上放置一个PdfViewer。

然后循环每一页 for (int i = 1; i <= pdfViewer1.PageCount; i++)

调用 chg_pdf_to_bmp函数获得图片并保存

chg_pdf_to_bmp中调用了PdfViewer的CreateBitmap函数

全部代码

private string pdf_fn = "";

private void button1_Click(object sender, EventArgs e)

{

pdf_fn = textBox1.Text.Trim();

if (! System.IO.File.Exists(pdf_fn))

return;

button1.Enabled = false;

string dir = System.IO.Path.GetDirectoryName(pdf_fn) + @"\" + System.IO.Path.GetFileNameWithoutExtension(pdf_fn) + ".files";

if (!System.IO.Directory.Exists(dir))

System.IO.Directory.CreateDirectory(dir);

pdfViewer1.LoadDocument(pdf_fn);

progressBar1.Value = 0;

progressBar1.Maximum = pdfViewer1.PageCount;

Application.DoEvents();

for (int i = 1; i <= pdfViewer1.PageCount; i++)

{

Bitmap bmp = chg_pdf_to_bmp(pdfViewer1,i);

bmp.Save(dir+@"\"+i.ToString()+".jpg", ImageFormat.Jpeg );

bmp.Dispose();

progressBar1.Value = progressBar1.Value +1;

Application.DoEvents();

}

MessageBox.Show("保存在"+ dir+"下");

button1.Enabled = true;

}

cs 复制代码
        private string pdf_fn = "";
        private void button1_Click(object sender, EventArgs e)
        {
            pdf_fn = textBox1.Text.Trim();
            if (! System.IO.File.Exists(pdf_fn))
                return;
            button1.Enabled = false;
            string dir = System.IO.Path.GetDirectoryName(pdf_fn) + @"\" + System.IO.Path.GetFileNameWithoutExtension(pdf_fn) + ".files";
            if (!System.IO.Directory.Exists(dir))
                System.IO.Directory.CreateDirectory(dir);
            pdfViewer1.LoadDocument(pdf_fn);
            progressBar1.Value = 0;
            progressBar1.Maximum = pdfViewer1.PageCount;
            Application.DoEvents();
            for (int i = 1; i <= pdfViewer1.PageCount; i++)
            {
                Bitmap bmp = chg_pdf_to_bmp(pdfViewer1,i);

                bmp.Save(dir+@"\"+i.ToString()+".jpg", ImageFormat.Jpeg ); 

                bmp.Dispose();
                progressBar1.Value = progressBar1.Value +1;
                Application.DoEvents();
            }
            MessageBox.Show("保存在"+ dir+"下");
            button1.Enabled = true;

        }

public Bitmap chg_pdf_to_bmp(DevExpress.XtraPdfViewer.PdfViewer VW_PDF, int i_page_no, int max_w = 210 * 4 * 3)

{

DevExpress.Pdf.PdfDocument _pdf_document = null;

VW_PDF.CurrentPageNumber = i_page_no;

VW_PDF.Refresh();

System.Reflection.PropertyInfo fiDocument = VW_PDF.GetType().GetProperty("Document", BindingFlags.Instance | BindingFlags.NonPublic);

_pdf_document = fiDocument.GetValue(VW_PDF, null) as DevExpress.Pdf.PdfDocument;

PdfPage pdfpage = _pdf_document.Pages[i_page_no - 1];

SizeF page_sf = VW_PDF.GetPageSize(i_page_no);

int pw = (int)(page_sf.Width / pdfpage.UserUnit * 500);

int ph = (int)(page_sf.Height / pdfpage.UserUnit * 500);

int bmp_w = pw; //pw * 3 / 2;

int bmp_h = ph; //ph * 3 / 2;

if (bmp_w > max_w)

bmp_w = max_w;

Bitmap bmp = VW_PDF.CreateBitmap(i_page_no, bmp_w);

return bmp;

}

cs 复制代码
        public Bitmap chg_pdf_to_bmp(DevExpress.XtraPdfViewer.PdfViewer VW_PDF, int i_page_no, int max_w = 210 * 4 * 3)
        {
            DevExpress.Pdf.PdfDocument _pdf_document = null;
            VW_PDF.CurrentPageNumber = i_page_no;
            VW_PDF.Refresh();
            System.Reflection.PropertyInfo fiDocument = VW_PDF.GetType().GetProperty("Document", BindingFlags.Instance | BindingFlags.NonPublic);
            _pdf_document = fiDocument.GetValue(VW_PDF, null) as DevExpress.Pdf.PdfDocument;

            PdfPage pdfpage = _pdf_document.Pages[i_page_no - 1];
            SizeF page_sf = VW_PDF.GetPageSize(i_page_no);
            int pw = (int)(page_sf.Width / pdfpage.UserUnit * 500);
            int ph = (int)(page_sf.Height / pdfpage.UserUnit * 500);
            int bmp_w = pw;                                            //pw * 3 / 2;
            int bmp_h = ph;                                            //ph * 3 / 2; 
            if (bmp_w > max_w)
                bmp_w = max_w;
            Bitmap bmp = VW_PDF.CreateBitmap(i_page_no, bmp_w);
            return bmp;
        }
相关推荐
SunTecTec4 分钟前
Flink Docker Application Mode 命令解析 - 修改命令以启用 Web UI
大数据·前端·docker·flink
DXM052122 分钟前
牟乃夏《ArcGIS Engine地理信息系统开发教程》学习笔记3-地图基本操作与实战案例
开发语言·笔记·学习·arcgis·c#·ae·arcgis engine
拉不动的猪1 小时前
前端常见数组分析
前端·javascript·面试
小吕学编程1 小时前
ES练习册
java·前端·elasticsearch
Asthenia04121 小时前
Netty编解码器详解与实战
前端
袁煦丞2 小时前
每天省2小时!这个网盘神器让我告别云存储混乱(附内网穿透神操作)
前端·程序员·远程工作
一个专注写代码的程序媛3 小时前
vue组件间通信
前端·javascript·vue.js
一笑code3 小时前
美团社招一面
前端·javascript·vue.js
懒懒是个程序员3 小时前
layui时间范围
前端·javascript·layui
NoneCoder3 小时前
HTML响应式网页设计与跨平台适配
前端·html