| c++ Programming Glossary: pipe_refReading and writing to USB (HID) interrupt endpoints on Mac http://stackoverflow.com/questions/3368008/reading-and-writing-to-usb-hid-interrupt-endpoints-on-mac  usb_interface UInt8  interface_endpoint_count 0 UInt8  pipe_ref 0xff UInt8  direction UInt8  number UInt8  transfer_type UInt16.. result  check endpoints for direction type etc. note that pipe_ref 0 is the control endpoint we don't want it for pipe_ref 1 pipe_ref.. pipe_ref 0 is the control endpoint we don't want it for pipe_ref 1 pipe_ref interface_endpoint_count pipe_ref  result intf GetPipeProperties.. 
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