Re: Getting node class data
Re: Getting node class data
- Subject: Re: Getting node class data
- From: Bill Stewart <email@hidden>
- Date: Tue, 15 Oct 2002 18:46:37 -0700
Thus - on further inspection (sigh!) this hasn't been hooked up... (I've
fixed it now, and we'll try to have this available as soon as we can)
So, how this is *meant* to work...
You can make a node with class data:
AUGraphNewNode (mGraph, NULL, 0, myCFPropList, &myNode)
- this does work:)
In this case you don't need to specify the component description, because
all of the info for that is contained within the class data.
I've also decided to get stricter about the size stuff (this has a lot of
history that I'm embarrassed to report here) - originally, this was going to
be some blob of memory, but we never did it that way, then we did the CF
version, thought that maybe it should work either way, only now to find that
it really doesn't.... So, its IS ONLY going to work with CF structs in the
future (ie. The classDataSize value will be ignored)
So then, if this were working, this is how you'd get the class info:
AUGraphGetNodeInfo (mGraph, myNode, NULL, NULL, &myCFPropList, NULL);
(Of course the first and last NULL can be Not-NULL if you want either/both
the ComponentDescription or the AudioUnit)
If you want to use myCFPropList you should take a CFRetain on this, and do a
CFRelease on it when you're done with it.
Sorry about the hassles.
Bill
on 15/10/02 7:54 AM, Robert Grant wrote:
>
Sorry for all these questions....
>
>
I'm trying to save the class data for a node, here's my code:
>
>
- (void)encodeWithCoder:(NSCoder*)coder
>
{
>
void* bytes;
>
UInt32 size;
>
OSStatus status = AUGraphGetNodeInfo(m_graph, m_node, NULL, &size,
>
NULL, NULL);
>
NSLog(@"GetNodeInfo status: %d", status);
>
bytes = malloc(size);
>
status = AUGraphGetNodeInfo(m_graph, m_node, NULL, &size, &bytes,
>
NULL);
>
NSLog(@"GetNodeInfo status: %d", status);
>
>
[coder encodeBytes: bytes length: size];
>
free(bytes);
>
}
>
>
First I'm getting the size of the class data and then malloc'ing a
>
buffer
>
of that size.
>
>
The problem is that size is coming back 0. This shouldn't be the case
>
should it?
>
This is happening with any node I try it on.
>
>
Thanks,
>
>
Robert.
>
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