networkSignalStrengthChanged explanation, please ;)

[dugonz]

Hello!
I'm a newbie with QT. Also my C++ is a bit rusty. I've been looking the API's of Mobility but I've a doubt in one:

void QSystemNetworkInfo::networkSignalStrengthChanged ( QSystemNetworkInfo::NetworkMode mode, int strength ) [signal]
This signal is emitted whenever the network mode signal strength changes, specified by strength.

I've tryied to use this signal but I'm not pretty sure how to use it. I don't know what should I write in "int strength".

For example:

  QSystemNetworkInfo red2;
  bool Changed = red2.networkSignalStrengthChanged(QSystemNetworkInfo::WlanMode, int);

to receive a boolean of if is changed or not?

Thanks in advance!

PS: A quick explanation of the signals will be very helpful also

[lpotter]

networkSignalStrengthChanged is a signal. You need to create a slot function to connect it to, in order to receive the notifications.

in your header:

private slots:
    void receivedSignalStrength(QSystemnetworkInfo:NetworkMode, int);

in your implementation:

void receivedSignalStrength(QSystemnetworkInfo:NetworkMode whichMode, int strength)
{
    switch whichMode {  
    case WlanMode:  
        qDebug() << "wifi strength changed" << strength;
    break;
    };
}

then somewhere else connect it up:

connect(&red2, SIGNAL(networkSignalStrengthChanged(QSystemnetworkInfo:NetworkMode, int)),
    this,SLOT(receivedSignalStrength(QSystemnetworkInfo:NetworkMode, int)));

More on signals and slots:
http://doc.trolltech.com/4.6/signalsandslots.html

If you just want the current signal strength of the connected wifi network you can do:

int strength = red2.networkSignalStrength(QSystemNetworkInfo::WlanMode);

[dugonz]

Thanks for the reply Ipotter. Good explanation. I will try this asap
Cheers,
H

[danhicksbyron]

Or just ask the iPhone guys -- I gather they're experts on the network signal strength thing.