How to convert joystick values to string



  • hi, am doing a project in which i have to read joystick values and send them to another comp . I am able to read joystick values, but not able to bundle them together . I tried doing this using by creating string.to convert joystick values i used "toString "member function.

    the code is
    @
    lcd1->display(joystick->getAxis(0));
    lcd2->display(joystick->getAxis(1));
    lcd3->display(joystick->getAxis(2));
    lcd4->display(joystick->getAxis(3));

    a1=(joystick->getAxis(0)).toString();
    a2=(joystick->getAxis(1)).toString();
    a3=(joystick->getAxis(2)).toString();
    a4=(joystick->getAxis(3)).toString();@
    

    I am able to read and display values correctly
    but this converting to string gives an error::

    Request for member function "toString();" ,which is of non class type int

    how can i remove this error.
    also is there any other way to send all joystick value as a packet over a network



  • looks like

    • your joystick->getAxis() returns an int.
    • int has no method toString (it's a base scalar type)

    if a1 is a QString (I suppose it is ?), you can use "QString::number":http://doc.qt.nokia.com/4.7/qstring.html#number-4

    Sending over the network is a bit unclear. But another idea is to look at "QDataStream":http://doc.qt.nokia.com/4.7/qdatastream.html on top of a well-chosen IODevice (like "QUdpSocket":http://doc.qt.nokia.com/4.7/qudpsocket.html )

    Note that sending to another computer, you need to decide of a protocol... Sounds to me that datagram would fit your need.



  • There is no general toString() like in java. You'll have to convert to QString with that's static methods:

    @
    QString a1 = QString::number(joystick->getAxis(0));
    @

    You could have found this from the fine "QString documentation":http://doc.qt.nokia.com/4.7/qstring.html yourself.


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