I'm attempting to create a concrete instance of the IAudioEvents COM interface (available in Vista and later). This is my first foray into COM programming, so I'm probably just doing something stupid here. Anyway, the following code fails to compile with "C2259: 'AudioEndpointVolumeNotifierImpl' : cannot instantiate abstract class".I'm attempting to create a concrete instance of
阅读背景：
开始C ++问题;无法实例化抽象类（VS中的C2259）
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