State Property Working with QuickTime Properties and Property Listeners

摘要

In the previous QuickTime Toolkit article ("The Informer" in MacTech, October 2005), we took a look at the QuickTime metadata functions, which are a replacement for the existing user data functions. We saw that we can use the functions QTMetaDataGetItemProperty and QTMetaDataSetItemProperty to get and set metadata item properties, and that we can use the function QTMetaDataGetItemPropertyInfo to get information about a metadata item property (such as the type or the size of its data).