Inno Setup: Deleting folders after restart during uninstallation

Question

I have a question about deleting folders during uninstallation using Inno Setup.

In my script, I use the uninsrestartdelete flag on some files and call DelTree on the {app} folder on the last step of uninstallation. Sometimes, I can't delete all files until system restart (those are code injection DLLs). In this situation, I can't delete the {app} folder successfully. What's the correct way to delete the {app} folder on system restart as well? I can make sure there is no file left in the folder When I try to delete it.

Answer 1

To schedule file or directory deletion on restart, call RestartReplace function with DestFile (second) argument set to an empty string ('').

RestartReplace(FileToDelete, '');

For directories, this works, only if they are empty. So you will have to first call RestartReplace for all files inside the directory, which cannot be deleted.

For details, refer to WinAPI function MoveFileEx and its MOVEFILE_DELAY_UNTIL_REBOOT flag, which is behind the Inno Setup RestartReplace function.