Getting the data from a void* in a struct

So there's this c++ struct that has a *void variable that I want to get the data from and I'm not sure how to do it. Here's the struct def (FYI its from the CoreAudio framework):

Code:

struct AudioBuffer
{
    UInt32  mNumberChannels;
    UInt32  mDataByteSize;
    void*   mData;
};
typedef struct AudioBuffer  AudioBuffer;

Thanks in advance!
GW

You have to cast the pointer to a usable pointer type before it can be used. What does mData represent?

It should be a float ranging from -1. to 1. I know I cant change the struct because its from the apple coreaudio framework. could I possibly create my own struct of the AudioBuffer type?

GW

A float? That's not what Apple seems to think. If it really is a float, for whatever reason, then you'll have to cast it to (float*) and then dereference it.

Well its data type is variable depending on a bunch of other stuff that you setup. The way I have done so it should be a float. So here's where my knowledge of pointers lacks, here's what I think will do the job. Please correct me if I'm wrong.

Code:

AudioBufferList tempList;
// code to read data into the buffer list

Float32 *frame = (Float32*) &tempList.mBuffers[0].mData;
NSLog(@"value: %f", *frame);

I know that can't be right but its the only way the complier will build it without errors.
Thanks a bunch
GW

mData is already a pointer. The address operator makes it a double pointer, and that is wrong.

Code:

Float32* frame = (Float32*)tempList.mBuffers[0].mData;

NSLog(@"value: %f", *frame);

When I do that Xcode has an error:
"Initializing 'Float32' (aka float) with an expression of incompatible type 'Float32* (aka float*)"

That's because you forgot the * after "Float32".

Ohhhhh..... there it is! Thanks a bunch!!!!