Maurice, Thanks for your reply.
There is certainly a lot to absorve from your answer. But I want to focus on small steps for now. The problem so far in Windows is that when I put the dlls on the VST plugins dir the host is not able to detect it (by host I mean Ableton Live and/or Bitwig for example). There are other test hosts such as VST Host and VST Analyser which are able to load the plugin but I think the dll directory problem fits like a glove here, since I need to specify manually where is the plugin I want to load and, therefore he knows that the remaining dlls are in the same dir. If I don’t link with Qt at all, Ableton Live recognizes the plugin. What should I do? I feel my hands tied… I would definitely remind you! Thanks so much. Regards, Nuno > On 19/05/2015, at 08:05, Kalinowski Maurice > <maurice.kalinow...@theqtcompany.com> wrote: > > Creating a VST is certainly possible, though you will need to do some extra > steps. > > a) you need an application object created inside your plugin. The easiest to > do so is to create a new thread (when the first instance is created or even > on show(), not during plugins loading), which will initialize everything, > otherwise you will get into troubles due to two different event loops > interfering each other. > b) Be careful about multiple instances, you will need to handle this > properly (Q(Core)Application is singleton, so check for existence > c) Try to not interfere with other VST plugins which might use Qt as well, > potentially a different version even. Then the order of plugins loaded might > make things fall apart. One step to take care of this is to namespace your Qt > build > d) as a start you can put Qt libraries and plugins also into your VST folder, > the host will load a bit slower but for testing that is ok. Later you might > want to use manifests or static linking. Another option would be to create a > thin layer, which then loads your plugin from another location where you have > arranged all dlls properly. > d) things I probably forgot... > > Unfortunately I have my VST test code at home and cannot give more guidance > right now. If there is a need for it, feel free to remind me to send some > snippets to you. VST2 or VST3? > > BR, > Maurice > > >> -----Original Message----- >> From: interest-bounces+maurice.kalinowski=theqtcompany.com@qt- >> project.org [mailto:interest- >> bounces+maurice.kalinowski=theqtcompany....@qt-project.org] On >> Behalf Of Nuno Santos >> Sent: Dienstag, 19. Mai 2015 08:27 >> To: Interests Qt >> Subject: [Interest] Windows VST plugin based on Qt >> >> 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 >> >> >> _______________________________________________ >> Interest mailing list >> Interest@qt-project.org >> http://lists.qt-project.org/mailman/listinfo/interest _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
