The reason libusb so strongly recommends using the udev mechanism is to avoid race conditions. For example, udev might be in the process of changing Unix permissions, uploading firmware, or mode-switching USB devices.
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。关于这个话题，体育直播提供了深入分析
Feb. 25 — Journey Together Booster Bundle
NSData, not NSString: The milText parameter wants an NSData* containing UTF-8 bytes, not an NSString*. Passing a string fails silently.