Does the Win32 api function, RegisterDeviceNotification require a GUI?
Will it work without a GUI?
开发者_StackOverflow社区Thank you.
It requires a window handle (or a service handle). The window handle may points to a hidden message-only window, so there is no GUI but there must be a message pump.
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是否在对方手机上显示已读，是由用户自行设置的。依次打开iPhone的“设置-信息”，会有一个“发送已读回执”的选项。将其打开，对方就能看到你，是否已经阅读了本条iMessage信息。将其关闭，对方就看不到。
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