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Re: QTF with QtfRichObject as Button label causes crash [message #26458 is a reply to message #26438]

Tue, 04 May 2010 17:35

mirek
Messages: 13976
Registered: November 2005

Ultimate Member

It is because QtfRichObject is only temporary reference to the RichObject.

You are using this reference, but then parsing qtf on Button paint, when RichObject does not exist anymore.

One possible solution:

#include <CtrlLib/CtrlLib.h>

using namespace Upp;

GUI_APP_MAIN
{
	Button button;
	
	{
		DrawingDraw dd(63, 187);
		dd.DrawImage(0,0,CtrlImg::exclamation());
	
		static Size ppi(72,72);// = ScreenDraw(true).GetPixelsPerInch();
		QtfRichObject qrdd(CreateDrawingObject(dd.GetResult(), Size(63*ppi.cx/10, 187*ppi.cy/10), Size(63*ppi.cx/10, 187*ppi.cy/10)));
	
		String qtf;
		qtf << qrdd;
		
		button.SetLabel("\1" + AsQTF(ParseQTF(qtf)));
	}
	TopWindow win;
	win.Add(button.SizePos());
	win.Run();
}

Note: I agree the situation is a little bit tricky, some widgets parse QTF on set (like RichTextView) - this would be no problem for these. Others parse QTF during Paint. Generally, everywhere where QTF needs '\1' prefix, it is being parsed during Paint.

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