How to write code that enters lines in the Command Arguments Section

[lolilol78]

@mrjj

I will check but that is my tutor who told me to do something like this..

[mrjj]

@lolilol78
but are u sure he didnt mean that APP should read text file ?
and not Creator ?

[lolilol78]

@mrjj
I created a code in exe that reads the text file and sort it

but then how can i do the connection com5 and baudrate 9600 if not typed manually inside the edit tab

[mrjj]

@lolilol78
hi
well
int main(int argc, char *argv[])
argc is tells the number of parameters to exe
so u can check that if any is given.

[lolilol78]

@mrjj not sure i understood really well, do you have any example please ?

[mrjj]

@lolilol78
hi
there is not much to it.
int argc tells the number of arguments.
often there is one. which is the path to exe.
so if argc is > 1 then there is (extra) parameters which are in the list
argv
argv is a char * array.

#include <QDebug>
int main(int argc, char* argv[]) {
  qDebug() << argv[0];
  if (argc == 1 ) {
    qDebug() << "no params given";
  }

  QApplication a(argc, argv);
  MainWindow w;
  w.show();

  return a.exec();
}

[lolilol78]

@mrjj ok thanks for your time ,
i will try to test something.

[mrjj]

@lolilol78
hi
i would try

  for (int pcount = 0; pcount < argc; ++pcount) {
    qDebug() <<  argv[pcount];
  }

with and without parameters in "run"/Creator

else just ask.

[lolilol78]

@mrjj thanks for the line but i didnt really understand what that means ? it is gonna print something ?

[mrjj]

@lolilol78
yes, it will show all parameters u give in creator / on command line when run
it was just for u to get a feeling on how it works.

[lolilol78]

@mrjj oh okay i understand thank you,

but actually the parameters are stock in my text file and i need some code to go get them parameters and make the serial connection between the console and the arduino.

then i dont know if it is possible..

[mrjj]

@lolilol78

well if if app sees that it got no parameter it could open the text file if u place it next to exe
yes it very possible.
You can use QFile

QFile file("comm.txt");
if(!file.open(QIODevice::ReadOnly)) {
    QMessageBox::information(0, "error", file.errorString());
}

QTextStream in(&file);

while(!in.atEnd()) {
    QString line = in.readLine();    // read first line
   qDebug() << line; // here u should set com port/ baud instead.
}

file.close();

[lolilol78]

@mrjj Thank you mrjj

[mrjj]

@lolilol78
so tutor said ok to read from file?
Note that sample read one line at a time

[lolilol78]

@mrjj yes the fils has already been read with another function, but now :
how to actually send those lines one by one to Arduino via Serial Com?

[aha_1980]

Hi @lolilol78

You are searching for QSerialPort

Examples: http://doc.qt.io/qt-5/qtserialport-examples.html

[lolilol78]

@aha_1980 hello aha,

i am really having troubles searching through the site of qt, i am a novice and i cant really manage to code properly every time i try.

after having my text file read and every line read as QString, i want to send each line to Arduino via Serial. how can I do it ?

[aha_1980]

@lolilol78

No no, it's not working that way - I'm not going to do your homework. I gave you two links and there are several examples.

The minimum you can do now is to have a look at the examples. Hint: this one looks close to your task :)

[JonB]

@lolilol78
You will use http://doc.qt.io/qt-5/qserialport.html#open to open your serial device for write and something like http://doc.qt.io/qt-5/qserialport.html#writeData or http://doc.qt.io/qt-5/qiodevice.html#write-2 to send the strings down the line.

[lolilol78]

@aha_1980 Actually there are not several examples as I am searching for days on the internet how to simply send a string line from a text file through Serial, but thank you for your help.