Re: Setting a custom/nongeneric AU property using AudioUnitSetProperty()

• Subject: Re: Setting a custom/nongeneric AU property using AudioUnitSetProperty()
• From: "Sophia Poirier [dfx]" <email@hidden>
• Date: Wed, 22 Nov 2006 11:35:51 -0500
• Delivered-to: email@hidden
• Delivered-to: email@hidden

Change this:
OSType niOpcode = "NIK0";

to this:
OSType niOpcode = 'NIK\0';

On Nov 22, 2006, at 11:29 AM, Cormac Daly wrote:

Hello,

My application utilizes a specific audio unit to synthesize a MIDI sequence. The vendor of the audio unit has provided me with an opcode and a struct which are to be provided to the AudioUnitSetProperty method so my application can instruct the AU to load specific files. The opcode in question is NIK\0 - this appears to be a string, but the vendor informs me that it should be represented as a four character code in order to pass it to AudioUnitSetProperty. Some quick googling has informed me that four character codes are represented on the Mac platform as OSType datatypes, hence my attempt to pass it in this manner. However, I am having no luck - although admittedly my attempts so far are a little flaky:

...
LoadCallStruct loadCallStructInstance = {2, 0, -1, 2, "multiTest1.nkm", 0};
OSType niOpcode = "NIK0";
ComponentResult loadCallResult;
loadCallResult = AudioUnitSetProperty(outputAU, niOpcode, kAudioUnitScope_Global, 0, & loadCallStructInstance, sizeof ( loadCallStructInstance));

I have not experienced any errors or warnings but I cannot hear any results - can anyone shed some light on how I can get this working? Or on how to tell if the property was set correctly, perhaps by interpreting loadCallResult?

Thanks,

Cormac

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