Hi! I have created the log program and want to collect some logs and display it in QTextBrowser without saving to the file. The problem is I get error: log.obj:-1: error: LNK2001: unresolved external symbol "private: static class QTextBrowser * Log::textBrowser" (?textBrowser@Log@@0PAVQTextBrowser@@A) static QTextBrowser *textBrowser; static void writeToLog(QString log) { textBrowser->append(log); } How to fix this issue? Thanks.

Definitely do not make a new QTextBrowser every time you call writeToLog, that defeats the purpose of making it static. You need to instantiate it one time in any given program run. Start by initializing it to null (or Q_NULLPTR), then in writeToLog check to see if it exists already. If it does not, then allocate it and set its parameters as appropriate, so something like: QTextBrowser *Log::textBrowser = null; ... void Log::writeToLog(QString logMessage) { if (!textBrowser) { textBrowser = new QTextBrowser; textBrowser->installEventFilter(this); connect(textBrowser, &QTextBrowser::textChanged, this, &Log::checkLogTextBrowser); } textBrowser->append(logMessage); }

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Log issues

Solved General and Desktop

21 Posts 4 Posters 10.2k Views 1 Watching

C Chris Hennes

Make sure to call checkLogTextBrowser() directly in your constructor as well, to handle anything that was logged before you opened it.
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Cobra91151

wrote on last edited by

#21

@Chris-Hennes

Now everything works. Thank you.
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