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Accepted
Alex Reynolds
Asked: 2010-10-01 15:30:12 +0800 CST

How to use 7-zip to send a Zip64-compressed file to standard output?

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I would like to make a Zip64 archive from a bunch of bzip2 files, using 7za's -so option to send the compressed archive to standard output:

$ 7za a dummy -tzip -so myFiles*.bz2 > test.zip

Here is the output I get:

7-Zip (A) [64] 9.13 beta  Copyright (c) 1999-2010 Igor Pavlov  2010-04-15
p7zip Version 9.13 (locale=en_US.UTF-8,Utf16=on,HugeFiles=on,2 CPUs)
Scanning

Creating archive stdout

System error:                                                                                                                                                                                                                              
E_NOINTERFACE

The file test.zip is empty. There is no information in the documentation about the error E_NOINTERFACE. What can I do within the application to fix this? Thanks for your advice!

EDIT

I do not want to extract bz2 files to standard output. I want to (a)dd to an archive called test.zip, made from a set of bz2 files, by sending the bundled archive to standard output. This is to use 7za to archive bz2 files in a manner similar to tar, as zip files provide random access while tar archives do not.

EDIT 2

Unfortunately, it looks like the developer confirms that 7-Zip does not support writing to standard output.

compression

2 Answers

  1. Best Answer

    When using -so, of the arguments to the -t option, I was only able to get gzip, bzip2 and tar to work. I get E_NOINTERFACE with zip as you do and I get E_NOTIMPL with 7z.

    I was not able to find a fix or workaround. This may be a bug in the beta version, but I had similar behavior from both the Linux version 9.04 beta and the Windows command line version 4.65.

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  2. Are you intending to extract files from the bzip2 files first, or just to include all the bzip files in a 7-zip archive? The -so switch extracts to standard output, so you'd need to run it through 7-zip again to add it to a new archive.

    Try something like:

    7za e -so myFiles*.bz2 | 7za a -tzip - test.zip

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