QDebug Class ReferenceThe QDebug class provides an output stream for debugging information. More... #include <QDebug> Public Functions
Detailed DescriptionThe QDebug class provides an output stream for debugging information. QDebug is used whenever the developer needs to write out debugging or tracing information to a device, file, string or console. Basic UseIn the common case, it is useful to call the qDebug() function to obtain a default QDebug object to use for writing debugging information. qDebug() << "Date:" << QDate::currentDate();
qDebug() << "Types:" << QString("String") << QChar('x') << QRect(0, 10, 50, 40);
qDebug() << "Custom coordinate type:" << coordinate;
This constructs a QDebug object using the constructor that accepts a QtMsgType value of QtDebugMsg. Similarly, the qWarning(), qCritical() and qFatal() functions also return QDebug objects for the corresponding message types. The class also provides several constructors for other situations, including a constructor that accepts a QFile or any other QIODevice subclass that is used to write debugging information to files and other devices. The constructor that accepts a QString is used to write to a string for display or serialization. Writing Custom Types to a StreamMany standard types can be written to QDebug objects, and Qt provides support for most Qt value types. To add support for custom types, you need to implement a streaming operator, as in the following example: QDebug operator<<(QDebug dbg, const Coordinate &c)
{
dbg.nospace() << "(" << c.x() << ", " << c.y() << ")";
return dbg.space();
}
This is described in the Debugging Techniques and Creating Custom Qt Types documents. Member Function DocumentationQDebug::QDebug ( QIODevice * device )Constructs a debug stream that writes to the given device. QDebug::QDebug ( QString * string )Constructs a debug stream that writes to the given string. QDebug::QDebug ( QtMsgType type )Constructs a debug stream that writes to the handler for the message type specified by type. QDebug::QDebug ( const QDebug & other )Constructs a copy of the other debug stream. QDebug::~QDebug ()Flushes any pending data to be written and destroys the debug stream. QDebug & QDebug::maybeSpace ()Writes a space character to the debug stream, depending on the last character sent to the stream, and returns a reference to the stream. If the last character was a space character, this function writes a space character to the stream; otherwise, no characters are written to the stream. See also space() and nospace(). QDebug & QDebug::nospace ()Clears the stream's internal flag that records whether the last character was a space and returns a reference to the stream. See also space() and maybeSpace(). QDebug & QDebug::space ()Writes a space character to the debug stream and returns a reference to the stream. The stream will record that the last character sent to the stream was a space. See also nospace() and maybeSpace(). QDebug & QDebug::operator<< ( QChar t )Writes the character, t, to the stream and returns a reference to the stream. QDebug & QDebug::operator<< ( bool t )Writes the boolean value, t, to the stream and returns a reference to the stream. QDebug & QDebug::operator<< ( char t )Writes the character, t, to the stream and returns a reference to the stream. QDebug & QDebug::operator<< ( signed short i )Writes the signed short integer, i, to the stream and returns a reference to the stream. QDebug & QDebug::operator<< ( unsigned short i )Writes then unsigned short integer, i, to the stream and returns a reference to the stream. QDebug & QDebug::operator<< ( signed int i )Writes the signed integer, i, to the stream and returns a reference to the stream. QDebug & QDebug::operator<< ( unsigned int i )Writes then unsigned integer, i, to the stream and returns a reference to the stream. QDebug & QDebug::operator<< ( signed long l )Writes the signed long integer, l, to the stream and returns a reference to the stream. QDebug & QDebug::operator<< ( unsigned long l )Writes then unsigned long integer, l, to the stream and returns a reference to the stream. QDebug & QDebug::operator<< ( qint64 i )Writes the signed 64-bit integer, i, to the stream and returns a reference to the stream. QDebug & QDebug::operator<< ( quint64 i )Writes then unsigned 64-bit integer, i, to the stream and returns a reference to the stream. QDebug & QDebug::operator<< ( float f )Writes the 32-bit floating point number, f, to the stream and returns a reference to the stream. QDebug & QDebug::operator<< ( double f )Writes the 64-bit floating point number, f, to the stream and returns a reference to the stream. QDebug & QDebug::operator<< ( const char * s )Writes the '\0'-terminated string, s, to the stream and returns a reference to the stream. QDebug & QDebug::operator<< ( const QString & s )Writes the string, s, to the stream and returns a reference to the stream. QDebug & QDebug::operator<< ( const QStringRef & s )Writes the string reference, s, to the stream and returns a reference to the stream. QDebug & QDebug::operator<< ( const QLatin1String & s )Writes the Latin1-encoded string, s, to the stream and returns a reference to the stream. QDebug & QDebug::operator<< ( const QByteArray & b )Writes the byte array, b, to the stream and returns a reference to the stream. QDebug & QDebug::operator<< ( const void * p )Writes a pointer, p, to the stream and returns a reference to the stream. QDebug & QDebug::operator= ( const QDebug & other )Assigns the other debug stream to this stream and returns a reference to this stream. X
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