当合并多个Pdf文件时，Pdfsharp内存不足异常 [英] Pdfsharp Out of Memory Exception when Combine Multi Pdf File
问题描述
我必须将大量（但未定义的）pdf转换成一个pdf，我正在使用代码PDFsharp。
I have to convert into a single pdf a large number (but undefined) pdf into one for this, I'm using the code PDFsharp here.
// Get some file names
string[] files = filesToPrint.ToArray();
// Open the output document
PdfDocument outputDocument = new PdfDocument();
PdfPage newPage;
int nProcessedFile = 0;
int nMemoryFile = 5;
int nStepConverted = 0;
String sNameLastCombineFile = "";
// Iterate files
foreach (string file in files)
{
// Open the document to import pages from it.
PdfDocument inputDocument = PdfReader.Open(file, PdfDocumentOpenMode.Import);
// Iterate pages
int count = inputDocument.PageCount;
for (int idx = 0; idx < count; idx++)
{
// Get the page from the external document...
PdfPage page = inputDocument.Pages[idx];
// ...and add it to the output document.
outputDocument.AddPage(page);
}
nProcessedFile++;
if (nProcessedFile >= nMemoryFile)
{
//nProcessedFile = 0;
//nStepConverted++;
//sNameLastCombineFile = "ConcatenatedDocument" + nStepConverted.ToString() + " _tempfile.pdf";
//outputDocument.Save(sNameLastCombineFile);
//outputDocument.Close();
}
}
// Save the document...
const string filename = "ConcatenatedDocument1_tempfile.pdf";
outputDocument.Save(filename);
// ...and start a viewer.
Process.Start(filename);
对于代码工作的少量文件，然后在某些时候
生成一个例外内存不足
For small numbers of files the code works but then at some point generates an exception of out of memory
是否有解决方案？
ps
我正在考虑保存文件一步一步然后剩下的那个人就这么谎言，但我找不到方式。
p.s I was thinking of saving the files in step and then the remaining aggiungingere so liebrare memory but I can not find the way.
更新1：
if (nProcessedFile >= nMemoryFile)
{
nProcessedFile = 0;
//nStepConverted++;
sNameLastCombineFile = "ConcatenatedDocument" + nStepConverted.ToString() + " _tempfile.pdf";
outputDocument.Save(sNameLastCombineFile);
outputDocument.Close();
outputDocument = PdfReader.Open(sNameLastCombineFile,PdfDocumentOpenMode.Modify);
}
更新2版本1.32
完整示例
行：
PdfDocument inputDocument = PdfReader.Open（file，PdfDocumentOpenMode.Import）;
UPDATE 2 versione 1.32 Complete example Error on line: PdfDocument inputDocument = PdfReader.Open(file, PdfDocumentOpenMode.Import);
文本错误：
<强>不能处理iref流。目前PDFsharp的实现无法处理Acrobat 6引入的PDF功能。
using PdfSharp.Pdf;
using PdfSharp.Pdf.IO;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
List<String> filesToPrint = new List<string>();
filesToPrint = Directory.GetFiles(@"D:\Downloads\RACCOLTA\FILE PDF", "*.pdf").ToList();
// Get some file names
string[] files = filesToPrint.ToArray();
// Open the output document
PdfDocument outputDocument = new PdfDocument();
PdfPage newPage;
int nProcessedFile = 0;
int nMemoryFile = 5;
int nStepConverted = 0;
String sNameLastCombineFile = "";
try
{
// Iterate files
foreach (string file in files)
{
// Open the document to import pages from it.
PdfDocument inputDocument = PdfReader.Open(file, PdfDocumentOpenMode.Import);
// Iterate pages
int count = inputDocument.PageCount;
for (int idx = 0; idx < count; idx++)
{
// Get the page from the external document...
PdfPage page = inputDocument.Pages[idx];
// ...and add it to the output document.
outputDocument.AddPage(page);
}
nProcessedFile++;
if (nProcessedFile >= nMemoryFile)
{
nProcessedFile = 0;
//nStepConverted++;
sNameLastCombineFile = "ConcatenatedDocument" + nStepConverted.ToString() + " _tempfile.pdf";
outputDocument.Save(sNameLastCombineFile);
outputDocument.Close();
inputDocument = PdfReader.Open(sNameLastCombineFile , PdfDocumentOpenMode.Modify);
}
}
// Save the document...
const string filename = "ConcatenatedDocument1_tempfile.pdf";
outputDocument.Save(filename);
// ...and start a viewer.
Process.Start(filename);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
Console.ReadKey();
}
}
}
}
UPDATE3
生成异常内存的代码
UPDATE3 Code that generate exception out of memory
int count = inputDocument.PageCount;
for (int idx = 0; idx < count; idx++)
{
// Get the page from the external document...
newPage = inputDocument.Pages[idx];
// ...and add it to the output document.
outputDocument.AddPage(newPage);
newPage.Close();
}
我不能确定哪一行一般例外
I can not exactly which row general exception
推荐答案
保存并关闭 outputDocument （代码已在您的代码段中注释掉），您必须打开 outputDocument 再次使用 PdfDocumentOpenMode.Modify 。
After saving and closing outputDocument (the code is commented out in your snippet), you have to open outputDocument again, using PdfDocumentOpenMode.Modify.
它可以帮助为 inputDocument 使用（...）添加。
It could help to add using(...) for the inputDocument.
如果您的代码以32位进程运行，则切换到64位将允许您的进程使用超过2 GB的RAM（假设您的计算机具有超过2 GB的RAM）。
If your code is running as a 32-bit process, then switching to 64 bit will allow your process to use more than 2 GB of RAM (assuming your computer has more than 2 GB RAM).
更新：消息无法处理iref流意味着您必须使用PDFsharp 1.50 Prerelease，可在NuGet上使用。
Update: The message "Cannot handle iref streams" means you have to use PDFsharp 1.50 Prerelease, available on NuGet.
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