gpio set

int GPIOClass::getval_gpio(string& val){

 

    string getval_str = "/sys/class/gpio/gpio" + this->gpionum + "/value";

    ifstream getvalgpio(getval_str.c_str());// open value file for gpio

    if (getvalgpio < 0){

        cout << " OPERATION FAILED: Unable to get value of GPIO"<< this->gpionum <<" ."<< endl;

        return -1;

            }

 

    getvalgpio >> val ;  //read gpio value

 

    if(val != "0")

        val = "1";

    else

        val = "0";

 

    getvalgpio.close(); //close the value file

    return 0;

}