- Qt 5.15
- Qt QML
- C++ Classes
- QQmlError
- Qt 5.15.18 Reference Documentation

# QQmlError Class

The QQmlError class encapsulates a QML error. More...

Header: | #include <QQmlError>
qmake: | QT += qml
Since: | Qt 5.0

This class was introduced in Qt 5.0.

- List of all members, including inherited members

## Public Functions

| QQmlError(const QQmlError &other)
| QQmlError()
QQmlError & | operator=(const QQmlError &other)
int | column() const
QString | description() const
bool | isValid() const
int | line() const
QtMsgType | messageType() const
QObject * | object() const
void | setColumn(int column)
void | setDescription(const QString &description)
void | setLine(int line)
void | setMessageType(QtMsgType messageType)
void | setObject(QObject *object)
void | setUrl(const QUrl &url)
QString | toString() const
QUrl | url() const

## Related Non-Members

QDebug | operator<<(QDebug debug, const QQmlError &error)

## Detailed Description

QQmlError includes a textual description of the error, as well as location information (the file, line, and column). The toString() method creates a single-line, human-readable string containing all of this information, for example:

     file:///home/user/test.qml:7:8: Invalid property assignment: double expected

You can use qDebug(), qInfo(), or qWarning() to output errors to the console. This method will attempt to open the file indicated by the error and include additional contextual information.

     file:///home/user/test.qml:7:8: Invalid property assignment: double expected
             y: "hello"
                ^

See also QQuickView::errors() and QQmlComponent::errors().

## Member Function Documentation

### QQmlError::QQmlError(const QQmlError &other)

Creates a copy of other.

### QQmlError::QQmlError()

Creates an empty error object.

### QQmlError &QQmlError::operator=(const QQmlError &other)

Assigns other to this error object.

### int QQmlError::column() const

Returns the error column number.

See also setColumn().

### QString QQmlError::description() const

Returns the error description.

See also setDescription().

### bool QQmlError::isValid() const

Returns true if this error is valid, otherwise false.

### int QQmlError::line() const

Returns the error line number.

See also setLine().

### QtMsgType QQmlError::messageType() const

Returns the message type.

This function was introduced in Qt 5.9.

See also setMessageType().

### QObject *QQmlError::object() const

Returns the nearest object where this error occurred. Exceptions in bound property expressions set this to the object to which the property belongs. It will be 0 for all other exceptions.

See also setObject().

### void QQmlError::setColumn(int column)

Sets the error column number.

See also column().

### void QQmlError::setDescription(const QString &description)

Sets the error description.

See also description().

### void QQmlError::setLine(int line)

Sets the error line number.

See also line().

### void QQmlError::setMessageType(QtMsgType messageType)

Sets the messageType for this message. The message type determines which QDebug handlers are responsible for receiving the message.

This function was introduced in Qt 5.9.

See also messageType().

### void QQmlError::setObject(QObject *object)

Sets the nearest object where this error occurred.

See also object().

### void QQmlError::setUrl(const QUrl &url)

Sets the url for the file that caused this error.

See also url().

### QString QQmlError::toString() const

Returns the error as a human readable string.

### QUrl QQmlError::url() const

Returns the url for the file that caused this error.

See also setUrl().

## Related Non-Members

### QDebug operator<<(QDebug debug, const QQmlError &error)

Outputs a human readable version of error to debug.