CODEWITHSUNDEEP
c++visual-studio-2010qt
learner
learner

Reputation: 45

Qt throwing ASSERT failure in QVector<T>::operator[]: "index out of range" in QTextBrowser

I am using QTextBrowser to display string through append function.

    void testing::displaytext()
    {   
      qRegisterMetaType<QTextCursor>("QTextCursor");
      ui.textBrowser->append("Welcome to the world of QT");
      ui.textBrowser->append("Welcome to the world of QT");
      ui.textBrowser->append("Welcome to the world of QT");
      ui.textBrowser->append("Welcome to the world of QT");
      ui.textBrowser->append("Welcome to the world of QT");
      ui.textBrowser->append("Welcome to the world of QT");
      ui.textBrowser->append("Welcome to the world of QT");
      ui.textBrowser->append("Welcome to the world of QT");
      ui.textBrowser->append("Welcome to the world of QT");
    }

The above function is being called by a thread in regular intervals, but after being called for sometimes it is throwing this error:

    ASSERT failure in QVector<T>::operator[]: "index out of range", file c:\iwmake\build_vs2010_opensource_________________padding_________________\include\qtcore\../../src/corelib/tools/qvector.h

How can i resolve this exception?

Upvotes: 2

Views: 4479

Answers (1)

Ralph Tandetzky
Ralph Tandetzky

Reputation: 23610

You should only call member functions of QWidget and all its descendents from the gui thread, because the class QWidget and hence also all its descendents including QTextBrowser have hardly any multi-threading guarantees. They are not even reentrant as documented here. However, triggering slots through signals is thread-safe and might be a solution to your problem.

Upvotes: 3

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