degree Celsius symbol not displayed in Qt QML

[Vijay R. Gawade]

I am using sqlite DB to store records
In DB "High Temperature Alarm Setting Changed to %1°C++3" text stored in Table.

I read record from DB in c++ class as follows:

SqlQuery query;
query.prepare("SELECT * FROM Events ORDER BY id DESC LIMIT 50 ");
query.exec();

QString msg
	while(query.next()){
		QString msg=query.value(3).toString();
		qDebug()<<"msg="<<msg;
		QStringList array = string.split("+");
		QString sign=array[2].toInt()>0?"+":"-";        
		QString trString = tr(QString(array[0]).replace("%1",sign+array[2]).toLocal8Bit());
		qDebug()<<"trString="<<trString;
	}

// Output: ​"High Temperature Alarm Setting Changed to %1?C++3"
// expected: "High Temperature Alarm Setting Changed to %1°C++3"

In ubuntu 18, it works fine & displaying degree celsius symbol but in G&F Display device it shows "?" symbol intead of "°"

Device we are using following device
https://support.garz-fricke.com/projects/Santino/Linux-Yocto/Releases/yocto-jethro-santino-overview.htm

Qt version: 5.9.4

[Vijay R. Gawade]

@JKSH said in degree Celsius symbol not displayed in Qt QML:

toLocal8Bit

Code is working correctly with toLocal8Bit() on another device with same bsp & h/w. Only one change is on my device I had updated bsp version & then downgrade it (for testing purpose) , In this process some lib/config may be not reset/remove correctly due to this representation problem comes.

Now I have change toLocal8Bit() to toUtf8() and now it works on both devices.

tr(QString(array[0]).replace("%1",sign+array[2]).toUtf8());

Thanks to all for help

[sierdzio]

Make sure your font has the degree symbol in it.

[JKSH]

@Vijay-R-Gawade What is the purpose of calling toLocal8Bit()?

[JoeCFD]

Use \302\260
QString str_degree( "20\302\260C" );
std::cout << " == " << qPrintable( str_degree ) << std::endl;

[KroMignon]

@JoeCFD said in degree Celsius symbol not displayed in Qt QML:

std::cout << " == " << qPrintable( str_degree ) << std::endl;

I do not understand the problem:

• Is it the log message output?
• the output in QML?
• the reading from SQL?

[JoeCFD]

@KroMignon I load temperature with unit C from xml and add \302\260 to it when it is displayed.
My code above is only for testing,

[Vijay R. Gawade]

@JKSH said in degree Celsius symbol not displayed in Qt QML:

toLocal8Bit

Code is working correctly with toLocal8Bit() on another device with same bsp & h/w. Only one change is on my device I had updated bsp version & then downgrade it (for testing purpose) , In this process some lib/config may be not reset/remove correctly due to this representation problem comes.

Now I have change toLocal8Bit() to toUtf8() and now it works on both devices.

tr(QString(array[0]).replace("%1",sign+array[2]).toUtf8());

Thanks to all for help