CODEWITHSUNDEEP
c#filepdf
TimH
TimH

Reputation: 1032

Read a PDF into a string or byte[] and write that string/byte[] back to disk

I am having a problem in my app where it reads a PDF from disk, and then has to write it back to a different location later.

The emitted file is not a valid PDF anymore.

In very simplified form, I have tried reading/writing it using

var bytes = File.ReadAllBytes(@"c:\myfile.pdf");
File.WriteAllBytes(@"c:\output.pdf", bytes);

and

var input = new StreamReader(@"c:\myfile.pdf").ReadToEnd();
File.WriteAllText("c:\output.pdf", input);

... and about 100 permutations of the above with various encodings being specified. None of the output files were valid PDFs.

Can someone please lend a hand? Many thanks!!

Upvotes: 2

Views: 8757

Answers (2)

Jay Riggs
Jay Riggs

Reputation: 53593

You're using File.WriteAllText to write your file out.

Try File.WriteAllBytes.

Upvotes: 3

sehe
sehe

Reputation: 393064

In C#/.Net 4.0:

using (var i = new FileStream(@"input.pdf", FileMode.Open, FileAccess.Read))
   using (var o = File.Create(@"output.pdf"))
      i.CopyTo(o);

If you insist on having the byte[] first:

using (var i = new FileStream(@"input.pdf", FileMode.Open, FileAccess.Read))
   using (var ms = new MemoryStream())
   {
        i.CopyTo(ms);
        byte[] rawdata = ms.GetBuffer();

        using (var o = File.Create(@"output.pdf"))
           ms.CopyTo(o);
   }

The memory stream may need to be ms.Seek(0, SeekOrigin.Origin) or something like that before the second CopyTo. look it up, or try it out

Upvotes: 3

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