[Interest] Windows VST plugin based on Qt

[Tony Rietwyk]

Hi Nuno, 

I strongly suggest to download "Dependency Walker" utility, and use that to test loading your DLL on Windows.  

Also, there are dozens of VST examples available, maybe you start with one that works, then extend it with Qt or whatever. 

Regards, 

Tony

> Sent: Tuesday, 19 May 2015 4:27 PM
> 
> Hi,
> 
> I�m trying to build a VST plugin based on Qt.
> 
> A VST plugin is a framework for creating audio processing and instrument
> plugins. It provides an api that one should follows. The result is a dynamic
> library that will be loaded by the host (dll on windows case, bundle on mac
> case). I have done it successfully on Mac (with still a lot of tests to perform
> and the need for correct deploy) and now i�m trying on Windows.
> 
> On Windows i�m being faced with some dll loading problems.
> 
> If I build the plugin without link Qt at all (CONFIG -= qt), the plugin is
> recognized by the host. Otherwise it isn�t. I want to use Qt, specially QML for
> UI. There are simpler ways of doing this, but I love Qt and I want my code to
> be the most transversal as possible.
> 
> I have been suggested that this problems is due to the loading path of the
> libraries. I suggested solution relies in using /DELAYLOAD
> 
> I have tried to perform /DELAYLOAD:Qt5Core.dll and the other three libs
> started by icu, and then using the SetDllDirectory to the path I have the
> deployed plugin.
> 
> Still, the host is unable to load the plugin correctly.
> 
> Can someone give me an insight on how to do this on windows?
> 
> Thanks,
> 
> Regards,
> 
> Nuno