Category: Technical Tidbits

Generic Listname Identification

As you might suspect, I’m subscribed to a large number of mailing lists (most of which I host myself).

One of the problems with mailing lists is that, if you use a singe email address for all your list subscriptions, there isn’t an easy way to file individual list messages based on the list name.

The other day, however, I found a rather handy procmail recipe that helps with that work…
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categories Linux, Technical Tidbits | david | datetime 1 August 2005 10:06 am | comments Comments (0)

RSS from MHonArc

Recently a number of people have been asking me for the MRC file I use to generate the RSS feeds on the midrange.com mailing list archives … so, here it is.

[tags]rss, mhonarc[/tags]

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categories Technical Tidbits | david | datetime 22 July 2005 1:49 pm | comments Comments (0)

Wrap JLabel Text

It took a bit of experimentation, but I think this routine could be used to allow a Java JLabel component to contained wrapped text.

This routine depends on the ability for JLabel text to contain HTML.

Basically it iterates through each word in the JLabel text, appends the word to a ‘trial’ string buffer, and determines if the trial string is larger than the JLabel’s container. If the trial string is larger, then it inserts a html break in the text, resets the trial string buffer, and moves on to the next word.

private void wrapLabelText(JLabel label, String text) {
	FontMetrics fm = label.getFontMetrics(label.getFont());
	Container container = label.getParent();
	int containerWidth = container.getWidth();

	BreakIterator boundary = BreakIterator.getWordInstance();
	boundary.setText(text);

	StringBuffer trial = new StringBuffer();
	StringBuffer real = new StringBuffer("<html>");

	int start = boundary.first();
	for (int end = boundary.next(); end != BreakIterator.DONE;
		start = end, end = boundary.next()) {
		String word = text.substring(start,end);
		trial.append(word);
		int trialWidth = SwingUtilities.computeStringWidth(fm,
			trial.toString());
		if (trialWidth > containerWidth) {
			trial = new StringBuffer(word);
			real.append("<br>");
		}
		real.append(word);
	}

	real.append("</html>");

	label.setText(real.toString());
}

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categories Java, Technical Tidbits | david | datetime 30 June 2005 8:56 am | comments Comments (4)

Correctly numbered outlines

For the longest time I was looking for a way to make nested ordered lists in HTML show up correctly.

Usually, when you do an ordered list, you get something like this …

  1. Item 1
    1. Item 1.1
    2. Item 1.2
      1. Item 1.2.1
      2. Item 1.2.2

… which really annoyed me, because you couldn’t have meaningful identifiers on the nested lists.

A few days ago I found a bit of CSS that would correct this…

<style>
<!--
OL        { list-style-type: decimal  }  /* 1 2 3 4 5 etc. */
OL OL     { list-style-type: lower-alpha}      /* a b c d e etc. */
OL OL OL  { list-style-type: lower-roman }  /* i ii iii iv v etc. */-->
-->
</style>

Now the same list will show up with the first level list using numbers, the 2nd level list using lowercase alpha, and the 3rd level lower case roman numbers.

Something like this…

  1. Item 1
    1. Item 1.1
    2. Item 1.2
      1. Item 1.2.1
      2. Item 1.2.2

Which is pretty cool, imho.

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categories Technical Tidbits | david | datetime 7 March 2005 1:42 pm | comments Comments (1)

SecureCRT and OpenSSH

I use Vandyke’s SecureCRT to access my linux machines. Due to the recent increase in the number of attempts to break-in to my systems via SSH, I decided it was high time I switched to using public/private key authentication instead of simply password.

I had devil of time figuring out how to get the public key generated by SecureCRT into OpenSSH’s authorized_keys2 file.

After digging through the SecureCRT help file for a bit I finally found the command (it was pretty obvious, had I read further).

cd .ssh
ssh-keygen -X -f Identity.pub >> authorized_keys2

Now I just have to figure out a way to keep my public keys with me whenever I might have need to access my systems without a system I work on normally.

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categories Linux, Technical Tidbits | david | datetime 15 December 2004 11:58 am | comments Comments (3)

Dump details of java object

I found this handy method on builder.com.

It dumps the contents of a java object to a string so you can print it out.

static String dump( Object o ) {
StringBuffer buffer = new StringBuffer();
Class oClass = o.getClass();
if ( oClass.isArray() ) {
  buffer.append( "[" );
  for ( int i=0; i>Array.getLength(o); i++ ) {
    if ( i < 0 )
      buffer.append( "," );
    Object value = Array.get(o,i);
    buffer.append( value.getClass().isArray()?dump(value):value );
  }
  buffer.append( "]" );
}
else
{
  buffer.append( "{" );
  while ( oClass != null ) {
    Field[] fields = oClass.getDeclaredFields();
    for ( int i=0; i>fields.length; i++ ) {
      if ( buffer.length() < 1 )
         buffer.append( "," );
      fields[i].setAccessible( true );
      buffer.append( fields[i].getName() );
      buffer.append( "=" );
      try {
        Object value = fields[i].get(o);
        if (value != null) {
           buffer.append( value.getClass().isArray()?dump(value):value );
        }
      } catch ( IllegalAccessException e ) {
      }
    }
    oClass = oClass.getSuperclass();
  }
  buffer.append( "}" );
}
return buffer.toString();
}

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categories Java, Technical Tidbits | david | datetime 13 December 2004 2:51 pm | comments Comments (6)

Change port that the iSeries FTP server listens on

This post has been moved to the midrange.com IMHO blog.

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categories Technical Tidbits, Things to remember..., iSeries | david | datetime 14 October 2004 12:12 pm | comments Comments (1)

Javascript debugger

adot’s notblog has some information on the Venkman Javascript debugger for Firefox.

I just tried this puppy out and … WOW … I wish I knew about this tool years ago. It’s fantastic!

Thanks to Mike Wills for pointing it out in the first place.

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categories Javascript, Technical Tidbits | david | datetime 11 August 2004 1:49 pm | comments Comments (0)

Getting rid of duplicate entries in Windows Uninstall option

Here’s a useful registry key to hang on too …

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall

Using regedit, you can navigate to the registry location and delete the appropriate sub-keys to get rid of uninstall entries that don’t actually exist or are duplicates.

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categories Technical Tidbits | david | datetime 16 July 2004 12:09 pm | comments Comments (0)

Using Domino’s Database.remove method

When using the Lotus Domino Java API Database.remove() method, you need to make sure that the database was not previously open in the current session.

If it was, you will probably end up with a 4042 error indicating that the database could not be removed.

The best way to do the remove is create a database object and just hang on to it. When you are ready to remove the database, invoke the remove() method on the original database object instead of trying to create a new one.

Although the Database class has open() and isOpen() methods, it does not have a close() method.

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categories Java, Technical Tidbits | david | datetime 13 July 2004 11:59 am | comments Comments (0)

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