• QComboBox::text() becomes itemText(), but I'm sure the word “text” appears umpty scadillion times, and I'm immediately relegating these cases to hand correction
• QRegExp no longer has search() and searchRev(), which have been replaced with

indexIn() and lastIndexIn() in QT4.

We seem to use only search(), but there is also QString::search() among possible others. I find four files with QRegExp, but seven files with “search(” and there is no easy common thread among the four files, and I can devise no sensible way to weed out the search() calls that pertain to QRegExp but not QString or whatever else.

Since there are only four affected files, it makes the most sense to just go change this by hand after we start working with post-converted files.

src/document/io/LilyPondExporter.cpp:1200: error: ‘class QRegExp’ has no member named ‘search’ src/gui/application/StartupTester.cpp:121: error: ‘class QRegExp’ has no member named ‘search’ src/gui/application/StartupTester.cpp:157: error: ‘class QRegExp’ has no member named ‘search’ src/gui/studio/DeviceEditorDialog.cpp:346: error: ‘class QRegExp’ has no member named ‘search’

• OK, the guide is here:

http://doc.trolltech.com/4.3/qstring-qt3.html

If you read up on the individual methods in the QT3-compatibility library, it shows you what to switch to what in the port (so we could make the switches ourselves to avoid using the hack library.) For instance, QString::lower() has become QString::toLower(), and so on.

I picked a few of these at random, and if these can be automated, I don't have enough experience with batch text manipulation to pull it off. For every term that needs to be replaced, there are at least twice as many occurrences of that term as there are errors about QString not having that member. “latin1” for instance. What else is using “latin1” and are all the other classes switching from “latin1” to “toLatin1” like QString is? Maybe, maybe not.

I'm moving on to the next one.

• We have another QString problem that might could be mechanized by somebody who

actually knows Perl.

In RoseXmlHandler and probably elsewhere, we make frequent use of this idiom:

      QString transposeStr = atts.value("defaultTranspose");
      if (transposeStr) {
          track->setTranspose(transposeStr.toInt());
      }

This depends on transposeStr being null if nothing was returned, but “Comparisons between QStrings and NULL in order to determine whether strings are empty are no longer allowed. Use isEmpty() instead.”

So all we need to do to this code snippet to make it work is rewrite it thusly:

      QString transposeStr = atts.value("defaultTranspose");
      if (!transposeStr.isEmpty()) {
          track->setTranspose(transposeStr.toInt());
      }

It might be easier to just fix these by hand than to try to whip up scripty magic. Especially for me.