Remove library after unloading

[mvw]

Hi all,

I am trying to make an application (for windows) which can be updated by replacing the dll library at run-time, problem is that the exe seems to keep the dll file locked after unloading.

What I'm trying to do in code:

QLibrary* Lib = new QLibrary("library");
   if(!Lib->load()) {
   qDebug() << mainLib->errorString();
	}
...
if( Lib->unload() ) {
   delete Lib;
   QFile::remove(libraryPath) //fails as file is locked :(
}

QLibrary* Lib = new QLibrary("library");
   if(!Lib->load()) {
   qDebug() << mainLib->errorString();
	}
...
if( Lib->unload() ) {
   delete Lib;
   QFile::remove(libraryPath) //fails as file is locked :(
}

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I've checked that the dll file is closed (process monitor, sysinternals) when trying to remove.

Does anybody know if this is something which can't be done by qLibrary, a Windows probem or whether an app restart is required?