Concatenate MemoryStreams and save it to Pdf file using PdfFileInfo

Aspose.PDF Product Family
1

Hi,

I’m looking for concatenate two FileStreams to get one MemoryStream and then, convert it to PDF file.

Both of my input files are PDF files.

PdfFileEditor editor = new PdfFileEditor();

FileStream fs1 = new FileStream(@“C:\Aspose\test1.pdf”, FileMode.Open);
FileStream fs2 = new FileStream(@“C:\Aspose\test2.pdf”, FileMode.Open);

MemoryStream outStream = new MemoryStream();

editor.Concatenate(fileStream1, fileStream2, outStream);


PdfFileInfo fi = new PdfFileInfo(outStream);

fi.SaveNewInfo(fileName);

An exception occured during the instantiation of “fi”. -> Invalid pdf format:pdf head signature is not found!: v4.2.0.0.

But, when I use the already concatenated file stream by using :
FileStream fs = new FileStream(@“C:\Aspose\concatenate.pdf”, FileMode.Open);

The line :
PdfFileInfo fi = new PdfFileInfo(fs);

works fine…

Have I done something wrong ? Have I used MemoryStream in the wrong way ?

2

By the way, I know I can get a FileStream instead of my MemoryStream but I want to work without physical files.

3

Hi Quentin,

Can you please try to add the following statement before passing outStream to the PdfFileInfo object?

outStream.Seek(0,SeekOrigin.Begin);

If it doesn’t resolve your issue then please share the sample PDF files with us, so we could test the issue at our end.

We’re sorry for the inconvenience.
Regards,

4

It works :slight_smile:

Thanks for your help.