How read a file and print values in Qt5 ?

cherault

Hi all,

I did a C++ program wich read a text file, transform it in "int" and print values.
My question is how to do the same with Qt using Signal and Slots ?
I don't have any idea of how to do it.

This is my C++ code:

@
#include <string>
#include <fstream>
#include <iostream>
#include <stdlib.h>
#include <unistd.h>

#define TEMP_PHYSIC "/sys/class/hwmon/hwmon1/device/temp1_input"
#define TEMP_CORE_1 "/sys/class/hwmon/hwmon1/device/temp2_input"
#define TEMP_CORE_2 "/sys/class/hwmon/hwmon1/device/temp3_input"
#define TEMP_CORE_3 "/sys/class/hwmon/hwmon1/device/temp4_input"
#define TEMP_CORE_4 "/sys/class/hwmon/hwmon1/device/temp5_input"

using namespace std;

class Temp
{
public:

    string tempPhys();
    string tempCore1();
    string tempCore2();
    string tempCore3();
    string tempCore4();

};

string Temp::tempPhys()
{
ifstream fichierPhys(TEMP_PHYSIC);
if(fichierPhys)
{
string lignePhys;
while(getline(fichierPhys, lignePhys))
{
return lignePhys;
}
}
}

string Temp::tempCore1()
{
ifstream fichierCore1(TEMP_CORE_1);
if(fichierCore1)
{
string ligneCore1;
while(getline(fichierCore1, ligneCore1))
{
return ligneCore1;
}
}
}

string Temp::tempCore2()
{
ifstream fichierCore2(TEMP_CORE_2);
if(fichierCore2)
{
string ligneCore2;
while(getline(fichierCore2, ligneCore2))
{
return ligneCore2;
}
}
}

string Temp::tempCore3()
{
ifstream fichierCore3(TEMP_CORE_3);
if(fichierCore3)
{
string ligneCore3;
while(getline(fichierCore3, ligneCore3))
{
return ligneCore3;
}
}
}

string Temp::tempCore4()
{
ifstream fichierCore4(TEMP_CORE_4);
if(fichierCore4)
{
string ligneCore4;
while(getline(fichierCore4, ligneCore4))
{
return ligneCore4;
}
}
}

int main()
{
while(true)
{
Temp temp;
int c0, c1, c2, c3, c4;

    c0 = atoi(temp.tempPhys().c_str());
    c1 = atoi(temp.tempCore1().c_str());
    c2 = atoi(temp.tempCore2().c_str());
    c3 = atoi(temp.tempCore3().c_str());
    c4 = atoi(temp.tempCore4().c_str());

    cout << "Temp. Physic : " << c0/1000 << " °c" << endl;
    cout << "====================" << endl;
    cout << "Temp. Core 1 : " << c1/1000 << " °c" << endl;
    cout << "Temp. Core 2 : " << c2/1000 << " °c" << endl;
    cout << "Temp. Core 3 : " << c3/1000 << " °c" << endl;
    cout << "Temp. Core 4 : " << c4/1000 << " °c" << endl;
    cout << "====================" << endl;

    usleep(100000);
    system&#40;"clear"&#41;;
}
return 0;

}
@

Thanks a lot for your help.

Regards,

Chris.

SGaist

Hi,

QObject for the base class
QFile for the file reading part
QTimer to trigger it at regular interval

If you are using C++11 you can even use directly a lambda

On the other hand you could also try QSocketNotifier so you should get notifications when there's new data to read

Hope it helps