"QNmeaPositionInfoSource: cannot find NMEA sentence with valid date & time".

Renjith R

Hi,

I am a newbie to Qt Positioning modules. I tried to parse NMEA messages using QNmeaPositionInfoSource in Qt.
Here is the code

QNmeaPositionInfoSource *nmeaSource = new QNmeaPositionInfoSource(QNmeaPositionInfoSource::SimulationMode);
nmeaSource->setDevice(/*logFile*/);
nmeaSource->setPreferredPositioningMethods(QGeoPositionInfoSource::AllPositioningMethods);
nmeaSource->startUpdates();

And I got this error when running the application

QNmeaPositionInfoSource: cannot find NMEA sentence with valid date & time

What's wrong with the above code(ref:https://doc.qt.io/qt-5/qnmeapositioninfosource.html)?
How to fix it?

eyllanesc

@Renjith-R show the logfile content.

6thC

@Renjith-R
https://doc.qt.io/qt-5/qnmeapositioninfosource.html#setDevice

The source device can only be set once and must be set before calling startUpdates() or requestUpdate().

Note: The device must emit QIODevice::readyRead() for the source to be notified when data is available for reading. QNmeaPositionInfoSource does not assume the ownership of the device, and hence does not deallocate it upon destruction.

/* logfile */

You just yadda yadda'd the most important detail. Example project probably will help: https://doc.qt.io/qt-5/qtpositioning-logfilepositionsource-example.html