Continuing Development

Support for internationalization is very easy with Qt. Using QString instead of char* for storing text gives us support for most of the written languages around the world. Our Page and Options structs look much simpler now.

All functions that use the Page and Options structs need to be updated to use QString properly. Since QString is also an implicitly shared class, we no longer have to do any memory management with our strings. We can remove all occurences of the qstrdup() function, and we never need to use new or delete when done with a string. QString will allocate and delete data when needed.

Here are the MainWindow::fileOpen() and MainWindow::pageChange() functions from mainwindow.ui.h. Notice that the code no longer uses delete or qstrdup() when storing text.

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Almost all of the functions in our application are affected by this change. In most cases, we end up removing more code than we are adding. To keep the size of this walkthrough reasonable, we've only shown a small portion of the required changes, since the changes are very similar to those shown above.

Writing Platform-Independent Code