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Exposing csoundRewindScore in CsoundUnity

#1

Hiya all, been using CsoundUnity and its class, but have found myself in need of csound’s rewindScore function, I tried my hand at exposing it:
[DllImport(_dllVersion, CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi, BestFitMapping = false, ThrowOnUnmappableChar = true)]
internal static extern void csoundRewindScore([In] IntPtr csound);
in CsoundCsharp.cs,
public void RewindScore()
{
Csound6.NativeMethods.csoundRewindScore(csound);
}
in CsoundUnityBridge.cs, and
public void RewindScore()
{
csound.RewindScore();
}
in CsoundUnity.cs
So doing that means i can call CsoundUnity.RewindScore(), but doing so crashes the program, its totally feesible me doing that is misguided, I’m the first to admit that I basically don’t know how dlls work, but yeah, any advice would be unreal (pardon the pun)
Cheers dudes

#2

Looks good to me.
Try removing some attributes in the DllImport, since you aren’t passing any string.

[DllImport(_dllVersion, CallingConvention = CallingConvention.Cdecl)]
internal static extern void csoundRewindScore([In] IntPtr csound);

Are you using the develop branch or the 2.3 release of CsoundUnity?

1 Like
#3

Oh really? Will drop the extra attributes, I thought maybe that meant to read the actual symbol name from the dll as ansi rather than the args
I’m using a version Rory imported into our repo, so I think it’s probably latest develop

#4

Yeah okay that works to expose it, turns out I’m dumb and actually want the csdl rewindScore function (to clear the score event buffer) but realised I can literally write a plugin opcode that just does that, ah well at least I learned something along the way!
And yeah for anyone wanting to add more function bindings, you just need to declare a public function in CsoundUnityBridge.cs which calls your imported dll function (so for example, Csound6.NativeEvents.csoundRewindScore(csound); and then also declare a public function that calls your newly wrapped method in CsoundUnity.cs!
Cheers Giovanni!

1 Like