cocoa - Read data from serial port using thread -

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at first - sorry english

i need read data serial port (from gps reciever) wrote small app using serialport x2. works. but. read data every 1 sec (on timer fire). , recieving data not well. without first bytes or last bytes. need read data "thread" (i did when wrote using delphi in windows). know using objc, quit newbie in c

if have small example (with tons of comments) on how - helpfull

thanks

xcode 4, macosx 10.6


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