<p><pre name="code" class="csharp"><p>公司需要将PDF转为图片，在网上查找了下发现有篇关于转换的帖子很不错。具体地址：http://blog.csdn.net/shi0090/article/details/7262199</p><p>为了稳定我选择了使用<span style="font-family: 'Microsoft YaHei'; font-size: 14px; line-height: 26px;">【Acrobat.dll】，通过Adobe官方提供的接口，实现PDF转图片，优点是官方提供，稳定性高。</span></p><p><span style="font-family: 'Microsoft YaHei'; font-size: 14px; line-height: 26px;">但却面临几个问题，</span></p><p><span style="font-family: 'Microsoft YaHei'; font-size: 14px; line-height: 26px;">第一：需要安装安装Adobe Acrobat X Pro，且不支持多线程。</span></p><p><span style="font-family: 'Microsoft YaHei'; font-size: 14px; line-height: 26px;">第二：web服务是不能获取剪贴板上的内容（在winfrom下可以通过剪贴板获取到转换后的图片）</span></p><p>因为我需要在web服务中去使用该方法，所以只能放弃，选择了之前博主说的<span style="font-family: 'Microsoft YaHei'; font-size: 14px; line-height: 26px;">较稳定的 </span><span style="font-family: 'Microsoft YaHei'; font-size: 14px; line-height: 26px;">O2S.Components.PDFRender4NET.dll</span></p><p><span style="font-family: 'Microsoft YaHei';"><span style="font-size: 14px; line-height: 26px;">因为需要打水印，所以我从博主的资源里下了个破解版无水印的dll，然后在拿到图片后进行了加水印操作。</span></span></p><p><span style="font-family: 'Microsoft YaHei'; font-size: 14px; line-height: 26px;">废话不多说 附代码</span></p><p><span style="font-family: 'Microsoft YaHei'; font-size: 14px; line-height: 26px;"><span style="white-space:pre"> </span> using O2S.Components.PDFRender4NET;
<span style="white-space:pre"> </span> using System;
<span style="white-space:pre"> </span> using System.Collections.Generic;
<span style="white-space:pre"> </span> using System.Configuration;
<span style="white-space:pre"> </span> using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.Services;</span></p> /// <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>
/// <param name="mark">设置水印</param>
public static void PDF2Images(string pdfInputPath, string imageOutputPath,
string imageName, int startPageNum, int endPageNum, ImageFormat imageFormat, float resolution, string mark)
{
//打开PDF
PDFFile pdfFile = PDFFile.Open(pdfInputPath);
//判断输出路径是否存在，如果不存在则创建
if (!Directory.Exists(imageOutputPath))
{
Directory.CreateDirectory(imageOutputPath);
}
//判断开始页数 如果为0 则默认从第一页开始
if (startPageNum <= 0)
{
startPageNum = 1;
}
//判断PDF总页数
if (endPageNum < pdfFile.PageCount)
{
endPageNum = pdfFile.PageCount;
}
//如果参数页参数传反，自动纠正
if (startPageNum > endPageNum)
{
int tempPageNum = startPageNum;
startPageNum = endPageNum;
endPageNum = startPageNum;
}
//默认图片格式
if (imageFormat == null) { imageFormat = ImageFormat.Jpeg; }
//根据总页数进行遍历
for (int i = startPageNum; i < endPageNum; i++)
{
//获取图片对象
Bitmap pageImage = pdfFile.GetPageImage(i, 56 * resolution);
//设置水印
Graphics g = Graphics.FromImage(pageImage);
Font font = new Font("Verdana", 16f, FontStyle.Bold, GraphicsUnit.Point);
g.DrawString(mark, font, Brushes.Red, 2, 1);
font.Dispose();
//将图片按照指定格式保存到本地
pageImage.Save(imageOutputPath + i.ToString() + "." + imageFormat.ToString(), imageFormat);
pageImage.Dispose();
}
pdfFile.Dispose();
}
</pre><pre name="code" class="csharp"><span style="white-space:pre"> </span>同时附上winform里面使用<span style="font-family: 'Microsoft YaHei'; font-size: 14px; line-height: 26px;">Acrobat.dll的源码</span>
<span style="font-family: 'Microsoft YaHei'; font-size: 14px; line-height: 26px;"><span style="white-space:pre"> </span> using System; <span style="white-space:pre"> </span> using System.Collections.Generic; <span style="white-space:pre"> </span> using System.Drawing; <span style="white-space:pre"> </span> using System.Drawing.Imaging; <span style="white-space:pre"> </span> using System.IO; <span style="white-space:pre"> </span> using System.Linq; <span style="white-space:pre"> </span> using System.Runtime.InteropServices; <span style="white-space:pre"> </span> using System.Threading; <span style="white-space:pre"> </span> using System.Timers; <span style="white-space:pre"> </span> using System.Windows.Forms; <span style="white-space:pre"> </span> using PDFConvertService.Comm; <span style="white-space:pre"> </span> using PDFConvertService.DAL; <span style="white-space:pre"> </span> using PDFConvertService.Entity;</span>
/// <summary>
/// 将PDF文档转换为图片的方法，你可以像这样调用该方法：ConvertPDF2Image("F:\\A.pdf", "F:\\", "A", 0, 0, null, 0);
/// 因为大多数的参数都有默认值，startPageNum默认值为1，endPageNum默认值为总页数，
/// imageFormat默认值为ImageFormat.Jpeg，resolution默认值为1
/// </summary>
/// <param name="pdfInputPath">PDF文件路径</param>
/// <param name="imageOutputPath">图片输出路径</param>
/// <param name="imageName">图片的名字，不需要带扩展名</param>
/// <param name="startPageNum">从PDF文档的第几页开始转换，默认值为1</param>
/// <param name="endPageNum">从PDF文档的第几页开始停止转换，默认值为PDF总页数</param>
/// <param name="imageFormat">设置所需图片格式</param>
/// <param name="resolution">设置图片的分辨率，数字越大越清晰，默认值为1</param>
public void ConvertPDF2Image(string pdfInputPath, string imageOutputPath,
string imageName, int startPageNum, int endPageNum, ImageFormat imageFormat, double resolution)
{
Acrobat.CAcroPDDoc pdfDoc = null;
Acrobat.CAcroPDPage pdfPage = null;
Acrobat.CAcroRect pdfRect = null;
Acrobat.CAcroPoint pdfPoint = null;
// Create the document (Can only create the AcroExch.PDDoc object using late-binding)
// Note using VisualBasic helper functions, have to add reference to DLL
pdfDoc = (Acrobat.CAcroPDDoc)Microsoft.VisualBasic.Interaction.CreateObject("AcroExch.PDDoc", "");
// validate parameter
if (!pdfDoc.Open(pdfInputPath)) { throw new FileNotFoundException(); }
if (!Directory.Exists(imageOutputPath)) { Directory.CreateDirectory(imageOutputPath); }
if (startPageNum <= 0) { startPageNum = 1; }
if (endPageNum > pdfDoc.GetNumPages() || endPageNum <= 0) { endPageNum = pdfDoc.GetNumPages(); }
if (startPageNum > endPageNum) { int tempPageNum = startPageNum; startPageNum = endPageNum; endPageNum = startPageNum; }
if (imageFormat == null) { imageFormat = ImageFormat.Jpeg; }
if (resolution <= 0) { resolution = 1; }
// start to convert each page
for (int i = startPageNum; i <= endPageNum; i++)
{
pdfPage = (Acrobat.CAcroPDPage)pdfDoc.AcquirePage(i - 1);
pdfPoint = (Acrobat.CAcroPoint)pdfPage.GetSize();
pdfRect = (Acrobat.CAcroRect)Microsoft.VisualBasic.Interaction.CreateObject("AcroExch.Rect", "");
int imgWidth = (int)((double)pdfPoint.x * resolution);
int imgHeight = (int)((double)pdfPoint.y * resolution);
pdfRect.Left = 0;
pdfRect.right = (short)imgWidth;
pdfRect.Top = 0;
pdfRect.bottom = (short)imgHeight;
// Render to clipboard, scaled by 100 percent (ie. original size)
// Even though we want a smaller image, better for us to scale in .NET
// than Acrobat as it would greek out small text
pdfPage.CopyToClipboard(pdfRect, 0, 0, (short)(100 * resolution));
IDataObject clipboardData = Clipboard.GetDataObject();
if (clipboardData.GetDataPresent(DataFormats.Bitmap))
{
Bitmap pdfBitmap = (Bitmap)clipboardData.GetData(DataFormats.Bitmap);
pdfBitmap.Save(Path.Combine(imageOutputPath, "") + i.ToString() + imageName + "." + imageFormat.ToString(), imageFormat);
pdfBitmap.Dispose();
}
}
pdfDoc.Close();
Marshal.ReleaseComObject(pdfPage);
Marshal.ReleaseComObject(pdfRect);
Marshal.ReleaseComObject(pdfDoc);
Marshal.ReleaseComObject(pdfPoint);
}
赶Demo中，做出来会放上。
时间： 2024-09-30 20:47:21