C ++设置串行com端口时出现问题

Question

I having a problem on the setting the serial COM port on my C++ program. There is my code in below.

#include<iostream>
using namespace std;
#include<string>
#include<stdlib.h>
#include"SerialPort.h"

char output[MAX_DATA_LENGTH];
char incomingData[MAX_DATA_LENGTH];

char *port = "\\\\.\\COM7";

int main(){
SerialPort arduino(port);
if(arduino.isConnected()){
    cout<<"Connection made"<<endl<<endl;
}
else{
    cout<<"Error in port name"<<endl<<endl;
}
while(arduino.isConnected()){
    cout<<"Enter your command: "<<endl;
    string data;
    cin>>data;

    char *charArray = new char[data.size() + 1];
    copy(data.begin(), data.end(), charArray);
    charArray[data.size()] = '\n';

    arduino.writeSerialPort(charArray, MAX_DATA_LENGTH);
    arduino.readSerialPort(output, MAX_DATA_LENGTH);

    cout<<">> "<<output<<endl;

    delete [] charArray;
    }
return 0;
}

There are an error on "\\\\\\\\.\\\\COM7"

showing an error message a value of type "const char *" cannot be used to initialize an entity of type "char *"

When I change it to const char *port = "\\\\\\\\.\\\\COM7";

It showing error on SerialPort arduino(port);

Please help me. Really need some help on this. Thank you.

Answer 1

In C++ literal strings are constant arrays of characters. Therefore you need const char* for pointers to them.

If you must pass a non-constant pointer to a function, use arrays :

char port[] = "\\\\.\\COM7";

A possibly better solution would be to modify the SerialPort constructor to accept const char* as its argument. Or even better to start using std::string for strings.