Qt Code: 
  1. FUNCTION __stdcall CloseDevice();
  2. FUNCTION __stdcall ReadAllAnalog(long *Data1, long *Data2);
  3. FUNCTION __stdcall OutputAnalogChannel(long Channel, long Data);
  4. FUNCTION __stdcall OutputAllAnalog(long Data1, long Data2);
  5. FUNCTION __stdcall ClearAnalogChannel(long Channel); 
  6. FUNCTION __stdcall ClearAllAnalog();
  7. FUNCTION __stdcall SetAnalogChannel(long Channel); 
  8. FUNCTION __stdcall SetAllAnalog();
  9. FUNCTION __stdcall WriteAllDigital(long Data);
  10. FUNCTION __stdcall ClearDigitalChannel(long Channel);
  11. FUNCTION __stdcall ClearAllDigital();
  12. FUNCTION __stdcall SetDigitalChannel(long Channel);
  13. FUNCTION __stdcall SetAllDigital();
  14. FUNCTION __stdcall ResetCounter(long CounterNr);
  15. FUNCTION __stdcall SetCounterDebounceTime(long CounterNr, long DebounceTime;
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All of those functions are missing the return value type. Did you try to add "void" between "FUNCTION" and "__stdcall"?