Gets the channel annotation.
Index to the waveform annotation to be retrieved. This index is zero-based. As an Example, if you are retrieving the 3rd waveform annotation, use an index of 2.
|NULL||An error occurred.|
This function returns a pointer to a DICOMWAVEFORMANNOTATION structure that describes one of waveform annotations associated with this channel.
This function returns NULL if the index is out of range or if the channel has no annotations associated with it.
NOTE: This function returns a pointer to an internal structure that is managed by the class. Therefore, you should not free it when you are done with it.
For an example, refer to LDicomWaveformChannel::SetChannelSamples8.
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