Managing Audio Data Blocks by Polling

In addition to using a callback function, you can poll the dwFlags member of a WAVEHDR or MIDIHDR structure to determine when an audio device is finished with a data block. There are times when it's better to poll dwFlags rather than wait for a window to receive messages from the drivers. For example, immediately after you call the waveOutReset function to release pending data blocks, you can poll to be sure that the data blocks are indeed done before proceeding to call the waveOutUnprepareHeader function and free the memory for the data block.

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