Warning QString::arg() argument missing

greetings,
in the following code i am intializing a QString object

Code:

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QString labelString;
...
labelString.clear();
labelString=QString("X%1 Y%2").arg(p.x()).arg(p.y()); //getting warning for this line
..

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This code is resulting in warning

Warning: QString::arg() :Argument Missing : X1.2233 Y4.23232

I couldn't find out the cause of this. Sicne this code is used very frequently so its like getting 200 wanings in 1 sec.

quickNitin

I don't see anything wrong with that particular line. Are you 100% sure it's that line? :)

yes, i am.
I have tried to make diferent string. Like

Code:

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labelString=QString("X%1f Y%2y).arg(p.x()).arg(p.y());

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This results in 'f' succesiding numbers.

So what's wrong with it? What would you like to get?

its giving me what output i want but it is resulting in a warning also. Since this code is continuously used so many warnings which i want to avoid as i can't see other info on terminal.

But this code is correct (apart from a missing quote). Are you sure the warning is related to this line? Could you provide a minimal compilable example which reproduces the problem?

Maybe you use that labelString in arg() in some other place?

here is part of code generated this warning.

Code:

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virtual void drawShape(QPainter &p)
	{	//std::cout<<"|"<<mX<<" "<<mY; 
 
		//preparing label to be displayed
		QString labelString;
		if(mLabelIndex==0)	{
			labelString.clear();
			labelString.setNum(mNo);
		}
		else if(mLabelIndex==1)	{
			QgsPoint p=toMapCoords(QPoint(mX,mY));
                        qWarning("Hello");
			labelString=QString("X%1 Y%1").arg(p.x()+mapCenterX).arg(p.y()+mapCenterY);
                       qWarning("Bye");
			}	
		QBrush brush(Qt::blue);
		if(mId==0) /
		{	p.save();
			p.setBrush(brush);
			p.drawEllipse(QRect(mX-3+mapCenterX,mY-3+mapCenterY,16,16));
			p.drawLine(mX+mapCenterX, mY+mapCenterY, mX+mapCenterX, mY-10+mapCenterY);
			if(mShowLabel)
				p.drawText(QPoint(mX+5+mapCenterX, mY+5+mapCenterY) , labelString);
			p.restore();
		}
		else if (mId==1) 
		{	brush.setColor(Qt::red);
			p.save();
			p.setBrush(brush);
			p.drawEllipse(QRect(mX-3+mapCenterX, mY-3+mapCenterY,1 6,16));
			p.drawLine(mX+mapCenterX, mY+mapCenterY, mX+mapCenterX, mY-10+mapCenterY);
			if(mShowLabel)
				p.drawText(QPoint(mX+5+mapCenterX, mY+5+mapCenterY), labelString);
			p.restore();
		}
		else if(mId==2)
		{	brush.setColor(Qt::yellow);
			p.save();
			p.setBrush(brush);
			p.drawEllipse(QRect(mX-3+mapCenterX, mY-3+mapCenterY,6,6));
			p.drawLine(mX+mapCenterX, mY+mapCenterY,mX+mapCenterX, mY-25+mapCenterY);
			if(mShowLabel)
				p.drawText(QPoint(mX+5+mapCenterX,mY+5+mapCenterY),labelString);
			p.restore();
		}
		//updateCanvas();
	}

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This is virtual function of a class which is derived from a class inhertiting Q3CanvasItemRectangle.
Here same warning appears between 2 warnings . except this function i am nowhere using this string

regards
quickNitin

Could you please prepare a minimal compilable example reproducing the problem? It would be much easier for us all to notice the issue.

Look closely:

Quote:

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Originally Posted by quickNitin

labelString=QString("X%1 Y%1").arg(p.x()+mapCenterX).arg(p.y()+mapCenterY) ;

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You have %1 twice, not %1 and %2 as you have shown us earlier.