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do you have experience using a Linux serial port as C++ stream

Jan Cumps

I'm trying to use a Linux serial port (say /dev/ttyx) as a sting stream in C++. Just like std::cout is used.

Do you have experience with it, or do you know a decent example?

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  • Threw something together quick, I didn't have time to test it, but give it a try:
    https://gist.github.com/03vmate/dbd3d423bc033367ae24faa6a6616860

    Use it like this:

    SerialStream serial("/dev/ttyX", 9600);

    // Write a string to the serial port
    serial << "AT\n\r";

    // Read a line from the serial port
    std::cout << "Response: " << serial << std::endl;

    // Read a line, in a different way
    std::string response;
    serial >> response;
    std::cout << "Response: " << response << std::endl;
  • in reply to vmate

    That looks very promising.

    I found something that I will also test out: https://stackoverflow.com/a/24992028

    #ifndef DEVTTY
#define DEVTTY "con"    // on Windows
// #define DEVTTY "/dev/tty" // on Linux/MacOS
#endif

using namespace std;

int main()
{
   cout << "DEVTTY = " << DEVTTY << endl;
   printf("Print[f]ed to stdout.\n");
   fprintf(stdout, "Print[f]ed to stdout.\n");
   cout << "Printed to std::cout" << endl;

   fprintf(stderr, "Print[f]ed to stderr.\n");
   cerr << "Printed to std::cerr" << endl;

   {
      // C, stdio version
      FILE* fd = fopen(DEVTTY, "w");
      fprintf(fd, "Printed to \"%s\"\n", DEVTTY); // will not be redirected
      fclose(fd);
   }

   {
      // C++, fstream version
      std::ofstream ofs(DEVTTY);
      ofs << "Printed via std::ofstream to \"" << DEVTTY << "\"" << endl; // will not be redirected
   }

   return EXIT_SUCCESS;
}

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  • in reply to vmate

    That looks very promising.

    I found something that I will also test out: https://stackoverflow.com/a/24992028

    #ifndef DEVTTY
#define DEVTTY "con"    // on Windows
// #define DEVTTY "/dev/tty" // on Linux/MacOS
#endif

using namespace std;

int main()
{
   cout << "DEVTTY = " << DEVTTY << endl;
   printf("Print[f]ed to stdout.\n");
   fprintf(stdout, "Print[f]ed to stdout.\n");
   cout << "Printed to std::cout" << endl;

   fprintf(stderr, "Print[f]ed to stderr.\n");
   cerr << "Printed to std::cerr" << endl;

   {
      // C, stdio version
      FILE* fd = fopen(DEVTTY, "w");
      fprintf(fd, "Printed to \"%s\"\n", DEVTTY); // will not be redirected
      fclose(fd);
   }

   {
      // C++, fstream version
      std::ofstream ofs(DEVTTY);
      ofs << "Printed via std::ofstream to \"" << DEVTTY << "\"" << endl; // will not be redirected
   }

   return EXIT_SUCCESS;
}

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