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Read File Title (from the Properties) - In Windows

Posted on 2003-11-11
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Last Modified: 2012-05-04
How can I read the Title and the other properties (all the properties under the Summary tab of the file properties)  of a PDF file? All this is running in Windows 2000.
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Question by:Éric Moreau
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6 Comments
 
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by:SuperKarateMonkey
ID: 9723232
Can't be done in java, I'm afraid.  it's a purely platform-dependent trick of Windows, and as a result, Sun has no interest in supporting it, as it wouldn't be platform independent.

Why do you need it?  Is it already in the file and you need to only read it, or were you planning on setting it yourself?
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by:Éric Moreau
ID: 9723930
We need a dynamic of retrieving these info from the files properties to display somewhere. The lowest maintenance would have been to use these properties.
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by:SuperKarateMonkey
ID: 9723963
Well, in that case it can't be done, at least in java directly.  The only possible option is going to be to try to hack it by using a windows command line, and calling it from the java.  I'm looking around through the windows documentation to see if this is possible, and I'll get back on this if I find anything.
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by:SuperKarateMonkey
ID: 9724527
Alright.  Good news and bad news:

Bad news:  The only 'officially' sanctioned way to access the Summary Information properties of a file is to use the C++ functions exposed by the windows API.  Also, these properties are only available in NTFS file systems.  If you have anything in FAT32 you're going to lose those properties when they get copied over to them.

Good news:  There are unofficial kludges available.  For example, there's a command line application that can be used to read these properties located at:

http://peccatte.karefil.com/Software/SumInfos/SumInfosEN.htm

You can then just call it from the command line using the command:

Runtime.getRuntime().exec(" etc..." );

Here's the tricky bit, though:  I don't think it's possible to capture the output of the program, so you're going to have to cobble together a .bat file which runs the program, and then dumps the results into a file.  From there you can read the file using java to get the appropriate properties.

This is really not the best way to handle this problem, but it's about as good as it's going to get if you want to stick to java.  Fact is, Sun really has no interest in tackling these sort of issues because they are windows-specific.  They'd rather deal with cross-platform features and performance enhancements, and I agree with that approach.  If you have no interest in any other platform but Windows w/ NTFS, (2000 and XP,) and you want to get into bed with Microsoft over an issue like this, you might need to look into Visual Studio.
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SuperKarateMonkey earned 125 total points
ID: 9724953
There's another way to handle grabbing the output of an executable, aside from dumping it into a file within a windows .bat file.  You could get it's output from an InputStream object.  The code would look like this:

try
{
      Process proc = Runtime.getRuntime().exec( "SomeExecutable.exe" );
      BufferedInputStream in = new BufferedInputStream( proc.getInputStream() );
      int i;
      while( ( i = in.read() ) != -1 )
      {
            System.out.print( (char)i );
      }
}
catch( IOException e )
{
      System.err.println( "Error:" + e.getMessage() );
      e.printStackTrace();
      System.exit(1);
}


Now, all this code does is dump the output to the System.out, but you could instead read it into a String to parse it, or any of a dozen different things.  You should beware, however, that the Runtime.createProcess() method creates a native process that runs asynchronously from the application, so you need to programatically buffer that inputstream IMMEDIATELY.  Don't do anything else, lest you lose output.  That's why you create a BufferedInputStream, by the way:  It will create a buffer for the InputStream to dump it's output into, so that you don't need to worry about whether you're catching all the output, or if you miss something.
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Expert Comment

by:softexperience
ID: 9981941
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