QGeoCodeReply Class
The QGeoCodeReply class manages an operation started by an instance of QGeoCodingManager. 更多...
| 头文件: | #include <QGeoCodeReply> |
| qmake: | QT += location |
| 开始支持版本: | Qt 5.6 |
| 基类: | QObject |
公有类型
| enum | Error { NoError, EngineNotSetError, CommunicationError, ParseError, ..., UnknownError } |
公有函数
| QGeoCodeReply(Error error, const QString &errorString, QObject *parent = Q_NULLPTR) | |
| virtual | ~QGeoCodeReply() |
| virtual void | abort() |
| Error | error() const |
| QString | errorString() const |
| bool | isFinished() const |
| int | limit() const |
| QList<QGeoLocation> | locations() const |
| int | offset() const |
| QGeoShape | viewport() const |
- 32 个公有函数继承自 QObject
信号
| void | aborted() |
| void | error(QGeoCodeReply::Error error, const QString &errorString = QString()) |
| void | finished() |
- 2 个信号继承自 QObject
受保护的函数
| QGeoCodeReply(QObject *parent = Q_NULLPTR) | |
| void | addLocation(const QGeoLocation &location) |
| void | setError(Error error, const QString &errorString) |
| void | setFinished(bool finished) |
| void | setLimit(int limit) |
| void | setLocations(const QList<QGeoLocation> &locations) |
| void | setOffset(int offset) |
| void | setViewport(const QGeoShape &viewport) |
- 9 个受保护的函数继承自 QObject
其他继承的成员
详细描述
The QGeoCodeReply class manages an operation started by an instance of QGeoCodingManager.
Instances of QGeoCodeReply manage the state and results of these operations.
The isFinished(), error() and errorString() methods provide information on whether the operation has completed and if it completed successfully.
The finished() and error(QGeoCodeReply::Error,QString) signals can be used to monitor the progress of the operation.
It is possible that a newly created QGeoCodeReply may be in a finished state, most commonly because an error has occurred. Since such an instance will never emit the finished() or error(QGeoCodeReply::Error,QString) signals, it is important to check the result of isFinished() before making the connections to the signals. The documentation for QGeoCodingManager demonstrates how this might be carried out.
If the operation completes successfully the results will be able to be accessed with locations().
成员类型
enum QGeoCodeReply::Error
Describes an error which prevented the completion of the operation.
| Constant | Value | Description |
|---|---|---|
QGeoCodeReply::NoError | 0 | No error has occurred. |
QGeoCodeReply::EngineNotSetError | 1 | The geocoding manager that was used did not have a QGeoCodingManagerEngine instance associated with it. |
QGeoCodeReply::CommunicationError | 2 | An error occurred while communicating with the service provider. |
QGeoCodeReply::ParseError | 3 | The response from the service provider was in an unrecognizable format. |
QGeoCodeReply::UnsupportedOptionError | 4 | The requested operation or one of the options for the operation are not supported by the service provider. |
QGeoCodeReply::CombinationError | 5 | An error occurred while results where being combined from multiple sources. |
QGeoCodeReply::UnknownError | 6 | An error occurred which does not fit into any of the other categories. |
成员函数
QGeoCodeReply::QGeoCodeReply(Error error, const QString &errorString, QObject *parent = Q_NULLPTR)
Constructs a geocode reply with a given error and errorString and the specified parent.
[protected] QGeoCodeReply::QGeoCodeReply(QObject *parent = Q_NULLPTR)
Constructs a geocode reply with the specified parent.
[virtual] QGeoCodeReply::~QGeoCodeReply()
Destroys this reply object.
[virtual] void QGeoCodeReply::abort()
Cancels the operation immediately.
This will do nothing if the reply is finished.
参见 aborted().
[signal] void QGeoCodeReply::aborted()
This signal is emitted when the operation has been cancelled.
This function was introduced in Qt 5.9.
参见 abort().
[protected] void QGeoCodeReply::addLocation(const QGeoLocation &location)
Adds location to the list of locations in this reply.
Error QGeoCodeReply::error() const
Returns the error state of this reply.
If the result is QGeoCodeReply::NoError then no error has occurred.
参见 setError().
[signal] void QGeoCodeReply::error(QGeoCodeReply::Error error, const QString &errorString = QString())
This signal is emitted when an error has been detected in the processing of this reply. The finished() signal will probably follow.
The error will be described by the error code error. If errorString is not empty it will contain a textual description of the error.
This signal and QGeoCodingManager::error() will be emitted at the same time.
Note: Do not delete this reply object in the slot connected to this signal. Use deleteLater() instead.
Note: Signal error is overloaded in this class. To connect to this one using the function pointer syntax, you must specify the signal type in a static cast, as shown in this example:
connect(geoCodeReply, static_cast<void(QGeoCodeReply::*)(QGeoCodeReply::Error, const QString &)>(&QGeoCodeReply::error), [=](QGeoCodeReply::Error error, const QString &errorString){ /* ... */ });
QString QGeoCodeReply::errorString() const
Returns the textual representation of the error state of this reply.
If no error has occurred this will return an empty string. It is possible that an error occurred which has no associated textual representation, in which case this will also return an empty string.
To determine whether an error has occurred, check to see if QGeoCodeReply::error() is equal to QGeoCodeReply::NoError.
[signal] void QGeoCodeReply::finished()
This signal is emitted when this reply has finished processing.
If error() equals QGeoCodeReply::NoError then the processing finished successfully.
This signal and QGeoCodingManager::finished() will be emitted at the same time.
Note: Do not delete this reply object in the slot connected to this signal. Use deleteLater() instead.
参见 setFinished().
bool QGeoCodeReply::isFinished() const
Return true if the operation completed successfully or encountered an error which cause the operation to come to a halt.
int QGeoCodeReply::limit() const
Returns the limit on the number of responses from each data source.
If no limit was set this function will return -1.
This may be more than locations().length() if the number of responses was less than the number requested.
参见 setLimit().
QList<QGeoLocation> QGeoCodeReply::locations() const
Returns a list of locations.
The locations are the results of the operation corresponding to the QGeoCodingManager function which created this reply.
参见 setLocations().
int QGeoCodeReply::offset() const
Returns the offset into the entire result set at which to start fetching results.
参见 setOffset().
[protected] void QGeoCodeReply::setError(Error error, const QString &errorString)
Sets the error state of this reply to error and the textual representation of the error to errorString.
This will also cause error() and finished() signals to be emitted, in that order.
参见 error().
[protected] void QGeoCodeReply::setFinished(bool finished)
Sets whether or not this reply has finished to finished.
If finished is true, this will cause the finished() signal to be emitted.
If the operation completed successfully, QGeoCodeReply::setLocations() should be called before this function. If an error occurred, QGeoCodeReply::setError() should be used instead.
参见 finished().
[protected] void QGeoCodeReply::setLimit(int limit)
Sets the limit on the number of responses from each data source to limit.
If limit is -1 then all available responses will be returned.
参见 limit().
[protected] void QGeoCodeReply::setLocations(const QList<QGeoLocation> &locations)
Sets the list of locations in the reply.
参见 locations().
[protected] void QGeoCodeReply::setOffset(int offset)
Sets the offset in the entire result set at which to start fetching result to offset.
参见 offset().
[protected] void QGeoCodeReply::setViewport(const QGeoShape &viewport)
Sets the viewport which contains the results to viewport.
参见 viewport().
QGeoShape QGeoCodeReply::viewport() const
Returns the viewport which contains the results.
This function will return 0 if no viewport bias was specified in the QGeoCodingManager function which created this reply.
参见 setViewport().