While Xojo doesn’t currently provide a direct way of recursively deleting a folder, there are various options that will allow you to do this:
1. Recursively iterate through all the folders, deleting each one. You can read about that at our Developer Site, this is the best cross-platform way.
2. Use the Shell to recursively delete a folder (i.e. “del /s” on Windows, or “rm -rf” on OS X and Linux)
Windows specific ways:
3. SHFileOperation (an older API)
4. IFileOperation (the more modern API that Windows recommends over option #3)
I’ve decided to look at option #4, since this allows more customized options, like the ability to show a progress dialog. However, it is also the slightly more complicated option since it deals with COM & Delegates. The example illustrates this:
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During my keynote address last April at XDC, the Xojo Developer Conference, I said that we would be adding Retina support (the OS X feature that provides for ultra-high resolution displays) to the OS X framework in the 4th quarter of this year. We have been working very hard on Retina support both for the OS X framework and for the IDE itself. We didn’t want to stop there though. Windows also supports ultra-high resolution displays. For Windows, this technology is called HiDPI. Xojo is a cross-platform tool so we decided we should support both Retina and HiDPI, and do it in such a way that you don’t have to do much of anything and they just work.