How to receive strings from Arduino in C++? - c++

Question

Hey I have problems with receiving strings from Arduino. I am running on linux and I want to use C++ fotr that. I an easily send strings from C++ code to arduino. For that I use C++ code like this.
#include <iostream>
#include <fstream>
using namespace std;
int main()
{
fstream arduino("/dev/ttyACM0");
arduino << "Led on\n";
arduino.close();
return 0;
}
So how can I receive strings from Arduino?

Answer 1

I'm not an Arduino expert, but from your code I concluded:
You are using a serial interface to send data
You should connect the serial interface to your computer (with a traditional serial cable, or USB)
Write a C++ app, that opens and received data from serial port. See this!
Find out from Arduino specs, what serial communication parameters are used by Arduino (stop bit, parity bits, baudrate etc) and use these parameters to configure the serial port in your C++ application!
Hope that helps!

Answer 2

Use boost.asio to communicate with a serial device and C++. It works like a charm and is pretty easy to use. See: http://www.boost.org/doc/libs/1_40_0/doc/html/boost_asio/overview/serial_ports.html and this: Reading from serial port with Boost Asio

Answer 3

The folowing code waits for a response from an arduino. If the response contains "Done" it returns 1. If it didn't find it within the given timeout, it returns -1.
It should not prove that hard to change this code to fit your needs.
int Serial::waitForResponse()
{
const int buffSize = 1024;
char bufferChar[buffSize] = {'\0'};
int counter = 0;
std::string wholeAnswer = "";
int noDataTime = 0;
while(wholeAnswer.find("Done") == std::string::npos) //Done string was found.
{
if(noDataTime > 10000)
{
std::cout << "timeout" << std::endl;
return -1;
}
counter = read(this->hSerial, bufferChar, buffSize - 1);
if(counter > 0)
{
noDataTime = 0;
bufferChar[counter] = '\0';
wholeAnswer += std::string(bufferChar);
} else
{
noDataTime++;
usleep(1000);
}
}
if(!wholeAnswer.empty())
{
return 1;
} else
{
return -1;
}