Reply To: Fail to connect Ev3 via USB

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Marcin Krzewski

my EV3 is connected via usb, when I run TestApplication I just get “Failed to open connection” error. I’m using Visual Studio 2012 and Windows 8.1. I know it’s probably the hidapi related error, I already tried copying hidapi.dll and hidapi.dylib files from my \LEGO MINDSTORMS EV3 Home Edition\HidApi folder to \TestApplication folder but it doesn’t fix the problem. I also tried compiling my own hidapi library according to instruction on but it doesn’t give the .dylib file and compiled hidapi.dll alone also doesn’t fix the problem. What am I doing wrong? Could you give me step-by-step instruction how to do it? Or should I switch to different software (Win7/VS2008)?

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