VST Host 32/64 bit mixed plugin support about vst.net HOT 3 CLOSED

Never tried that. You would have to thunk the VST interface for methods that have different binary signatures in 32bit and 64bit.
https://github.com/obiwanjacobi/vst.net/blob/master/Source/Code/Jacobi.Vst.Interop/Host/VstPluginCommandStub.cpp

Then you'd have to detect if a plugin dll is 32bit or 64bit during loading and use the thunked or normal implementation of the command stub.
https://github.com/obiwanjacobi/vst.net/blob/master/Source/Code/Jacobi.Vst.Interop/Host/VstUnmanagedPluginContext.cpp

I guess it could be done.

from vst.net.

For reference: Here's how RtMidi.Core does it:

https://github.com/micdah/RtMidi.Core/tree/master/RtMidi.Core/Unmanaged/API

from vst.net.

After some research it seems that it is not possible to load a 32-bit dll (plugin) into a 64-bit host (exe).
Note that PInvoke (as the RtMidi example uses) will not work in our scenario, because we have to load multiple plugin's dynamically. PInvoke statically names the dll to interop with.

64-bit hosts can only load 64-bit plugins and the same goes for 32-bit.

from vst.net.