RMagick and JPEG datastream contains no image

December 7th, 2006

Today, I hit a major roadblock: “JPEG datastream contains no image”. I turned to Google and found a solution.

Line 55 of tempfile.rb is: 


@tmpfile = File.open(tmpname, File::RDWR|File::CREAT|File::EXCL, 0600)

Unfortunately, on Windows, this causes problems. If the file contains binary data (such as a JPEG datastream…), the fact that we open the file without the BINARY flag sometimes truncates the file content.

I patched my local Ruby 1.8.4 version to this: 


@tmpfile = File.open(tmpname, File::RDWR|File::CREAT|File::EXCL|File::BINARY, 0600)

The only change is I OR the File::BINARY flag to the mode parameter.

Now, I guess I should submit a Ruby enhancement request, no ? With failing test and all ? Sometimes I hate my Windows box…

1 Response to “RMagick and JPEG datastream contains no image”

  1. Ben Greenberg Says:
    January 29th, 2008 at 11:10 PM

    Thanks! I know this is an old post, but I ran into this issue. It’s still not fixed in 1.8.6.

    In addition to your patch, I also had to change the File.open call in the #open method to: File.open(@tmpname, ‘rb+’) (line 77 in 1.8.6).

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I am François Beausoleil, a Ruby on Rails coder. During the day, I work on XLsuite. At night, I am interested many things. Read my biography

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