QMessageLogContext Class Reference

\inmodule QtCore More...

#include <qlogging.h>

Collaboration diagram for QMessageLogContext:

Public Member Functions
constexpr	QMessageLogContext () noexcept=default
constexpr	QMessageLogContext (const char *fileName, int lineNumber, const char *functionName, const char *categoryName) noexcept

Public Attributes
int	version = 2
int	line = 0
const char *	file = nullptr
const char *	function = nullptr
const char *	category = nullptr

Friends
class	QMessageLogger
class	QDebug

Detailed Description

\inmodule QtCore

The QMessageLogContext class provides additional information about a log message.

Since

5.0

The class provides information about the source code location a qDebug(), qInfo(), qWarning(), qCritical() or qFatal() message was generated.

Note

By default, this information is recorded only in debug builds. You can overwrite this explicitly by defining QT_MESSAGELOGCONTEXT or {QT_NO_MESSAGELOGCONTEXT}.

See also

QMessageLogger, QtMessageHandler, qInstallMessageHandler()

Definition at line 38 of file qlogging.h.

Constructor & Destructor Documentation

QMessageLogContext() [1/2]

QMessageLogContext::QMessageLogContext ( )

constexprdefaultnoexcept

Constructs a QMessageLogContext

QMessageLogContext() [2/2]

QMessageLogContext::QMessageLogContext ( const char *  fileName, int  lineNumber, const char *  functionName, const char *  categoryName  )

inlineconstexprnoexcept

Constructs a QMessageLogContext with for file fileName at line lineNumber, in function functionName, and category categoryName.

Definition at line 43 of file qlogging.h.

Friends And Related Symbol Documentation

QDebug

friend class QDebug

friend

Definition at line 56 of file qlogging.h.

QMessageLogger

friend class QMessageLogger

friend

Definition at line 55 of file qlogging.h.

Member Data Documentation

category

const char* QMessageLogContext::category = nullptr

Definition at line 50 of file qlogging.h.

Referenced by QMessageLogger::critical(), QMessageLogger::critical(), QMessageLogger::debug(), QMessageLogger::debug(), QMessageLogger::fatal(), QMessageLogger::fatal(), QMessageLogger::info(), QMessageLogger::info(), QDebugMessageServiceImpl::sendDebugMessage(), QMessageLogger::warning(), and QMessageLogger::warning().

file

const char* QMessageLogContext::file = nullptr

Definition at line 48 of file qlogging.h.

Referenced by QDebugMessageServiceImpl::sendDebugMessage().

function

const char* QMessageLogContext::function = nullptr

Definition at line 49 of file qlogging.h.

Referenced by QDebugMessageServiceImpl::sendDebugMessage().

line

int QMessageLogContext::line = 0

Definition at line 47 of file qlogging.h.

Referenced by QDebugMessageServiceImpl::sendDebugMessage().

version

int QMessageLogContext::version = 2

Definition at line 46 of file qlogging.h.

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The documentation for this class was generated from the following files:

• qtbase/src/corelib/global/qlogging.h
• qtbase/src/corelib/global/qlogging.cpp