STATE PROPERTY 2: OPENING QUICKTIME MOVIES USING PROPERTIES

摘要

In the previous QuickTime Toolkit article ("State Property" in MacTech, November 2005), we learned how to work with the QuickTime properties functions introduced in QuickTime 6.4 and considerably expanded in QuickTime 7. We saw how to get and set movie properties using those functions, and we saw how to install a property listener so that our applications can be informed about changes to some of those movie properties. Currently, only two small sets of movie properties are gettable or settable or listenable using those functions. These are a handful of visual properties (hue, saturation, brightness, and contrast) and a smaller handful of audio properties (gain, mute, and balance). So why is the header file Movies.h chock full of identifiers for other property classes and other property types within those classes?