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Asked: 2026-05-16T15:14:00+00:00

I have three QLineEdit fields, whose content is changing really fast (100/second). Somehow it

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I have three QLineEdit fields, whose content is changing really fast (100/second).
Somehow it crashes the application. Maybe it’s a bug or I make a mistake.

Here is some code:

acc[0]->setText(QString("%1").arg(acceleration.x));
acc[1]->setText(QString("%1").arg(acceleration.y));
acc[2]->setText(QString("%1").arg(acceleration.z));

The call stack: http://pastebin.com/RmkZHTjk

And sometimes I get this error:

Unhandled exception at 0x6518cbb3
(QtGuid4.dll) in Test.exe: 0xC0000005:
Access violation reading location
0x0000002c.

Call stack for this: http://pastebin.com/c1u53a0Z

I tried it with QLabel, then I get another error:

Unhandled exception at 0x751a9617 in
Test.exe: Microsoft C++ exception:
std::bad_alloc at memory location
0x03aeea70..

Call stack: http://pastebin.com/G4yeiW2Y

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1 Answer

  1. Editorial Team

    Lets get this closed. This is Frank’s answer posted as comment a week ago.

    @Roland Soós: It looks to me like you call setText() from the non-UI thread. That won’t work, QWidgets are not thread-safe. — Frank

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