来自MemoryStream()的PdfReader [英] PdfReader from MemoryStream()

问题描述

谁能给我一个如何从MemoryStream获取PdfReader的示例吗?我可以看到PdfReader类有几个看起来像候选方法的方法(GetStreamBytes& GetStreamBytesRaw)，但是这些方法似乎想要特定于iText的流，而我只是常规的Byte[]或MemoryStream.

Can anyone give me an example of how to get a PdfReader from a MemoryStream? I can see that the PdfReader class has a couple of methods which look like likely candidates (GetStreamBytes & GetStreamBytesRaw), however these seem to want iText-specific streams, mine is just a regular Byte[] or MemoryStream.

这使用的是C#和.NET 4.

This is using C# and .NET 4.

iTextSharp.text.pdf.PdfReader rdr = iTextSharp.text.pdf.PdfReader.GetStreamBytesRaw

推荐答案

只要MemoryStream是有效的PDF对象，就可以从MemoryStream创建PdfReader.如果MemoryStream是有效的PDF对象，则启动PdfReader的一种方法是:

You can create a PdfReader from a MemoryStream, so long as the MemoryStream is a valid PDF object. If the MemoryStream is a valid PDF object, then one way to initiate the PdfReader is this way:

PdfReader _reader = new PdfReader((byte[])_memoryStream.ToArray());

在下面的代码中，从.Net Resource初始化了PdfReader，当从Properties.Resources对象调用该资源时，它作为字节[]返回，因此Resource和MemoryStream将相同的类型返回给PdfReader，即一个字节[].然后，我从PdfReader对象创建一个PdfStamper对象，并将MemoryStream用作PdfStamper的结果容器.

In the code below, the PdfReader is initialized from .Net Resource which is returned as a byte[] when called from the Properties.Resources object, so the Resource and the MemoryStream are returning the same type to the PdfReader, a byte[]. I then create a PdfStamper object from the PdfReader object, and use a MemoryStream as the resulting container for the PdfStamper.

PdfReader _srcDoc = new PdfReader(Properties.Resources.Resource1);
MemoryStream _output = new MemoryStream();
PdfStamper _scratchDoc = new PdfStamper(_srcDoc, _output);

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