问对错误的未定义引用

EN

#include "modbus.h"    

modbus::modbus()
{
    hostName = "127.0.0.1";
    openProtocol();

    runPollLoop();

    closeProtocol();

}


void modbus::openProtocol()
{
   int result;

   result = mbusProtocol->openProtocol(hostName);

   if (result != FTALK_SUCCESS)
   {
      fprintf(stderr, "Error opening protocol: %s!\n",
                       getBusProtocolErrorText(result));
      exit(EXIT_FAILURE);
   }
}


void modbus::closeProtocol()
{
   mbusProtocol->closeProtocol();
}


void modbus::runPollLoop()
{
   short dataArr[10];

   for (;;)
   {
      int i;
      int result;

      result = mbusProtocol->readMultipleRegisters(1, 100,
                                                  dataArr,
                                                  sizeof(dataArr) / 2);
      if (result == FTALK_SUCCESS)
         for (i = 0; i < int(sizeof(dataArr) / 2); i++)
            printf("[%d]: %hd\n", 100 + i, dataArr[i]);
      else
      {
         fprintf(stderr, "%s!\n", getBusProtocolErrorText(result));
         // Stop for fatal errors
         if (!(result & FTALK_BUS_PROTOCOL_ERROR_CLASS))
            return;
      }

#ifdef __WIN32__
      Sleep(1000);
#else
      sleep(1);
#endif
   }
}

#ifndef MODBUS_H
#define MODBUS_H

#include <stdio.h>
#include <stdlib.h>

#include "MbusTcpMasterProtocol.hpp"

class modbus
{
public:
    modbus();

    char *hostName;
    MbusTcpMasterProtocol *mbusProtocol;

    void openProtocol();
    void closeProtocol();
    void runPollLoop();
};

#endif // MODBUS_H

In function `modbus::openProtocol()':
error: undefined reference to `MbusTcpMasterProtocol::MbusTcpMasterProtocol()'
error: undefined reference to `MbusTcpMasterProtocol::openProtocol(char const*)'
error: undefined reference to `getBusProtocolErrorText'

In function `modbus::runPollLoop()':
error: undefined reference to `MbusMasterFunctions::readMultipleRegisters(int, int, short*, int)'
error: undefined reference to `getBusProtocolErrorText'
collect2: ld returned 1 exit status

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = ModBus
TEMPLATE = app


SOURCES += main.cpp\
        dialog.cpp \
    modbus.cpp

HEADERS  += dialog.h \
    modbus.h

FORMS    += dialog.ui