QGeoRouteReply class manages an operation started by an instance of QGeoRoutingManager . 更多...
| 头： | #include <QGeoRouteReply> |
| qmake: | QT += location |
| Since: | Qt 5.6 |
| 继承： | QObject |
| enum | Error { NoError, EngineNotSetError, CommunicationError, ParseError, UnsupportedOptionError, UnknownError } |
| QGeoRouteReply (Error error , const QString & errorString , QObject * parent = Q_NULLPTR) | |
| virtual | ~QGeoRouteReply () |
| virtual void | abort () |
| Error | error () const |
| QString | errorString () const |
| bool | isFinished () const |
| QGeoRouteRequest | request () const |
| QList<QGeoRoute> | routes () const |
| void | aborted () |
| void | error (QGeoRouteReply::Error error , const QString & errorString = QString()) |
| void | finished () |
| QGeoRouteReply (const QGeoRouteRequest & request , QObject * parent = Q_NULLPTR) | |
| void | addRoutes (const QList<QGeoRoute> & routes ) |
| void | setError (Error error , const QString & errorString ) |
| void | setFinished (bool finished ) |
| void | setRoutes (const QList<QGeoRoute> & routes ) |
QGeoRouteReply class manages an operation started by an instance of QGeoRoutingManager .
Instances of QGeoRouteReply manage the state and results of these operations.
isFinished (), error () 和 errorString () methods provide information on whether the operation has completed and if it completed successfully.
finished () and error( QGeoRouteReply::Error , QString ) signals can be used to monitor the progress of the operation.
It is possible that a newly created QGeoRouteReply may be in a finished state, most commonly because an error has occurred. Since such an instance will never emit the finished () or error( QGeoRouteReply::Error , QString ) signals, it is important to check the result of isFinished () before making the connections to the signals. The documentation for QGeoRoutingManager demonstrates how this might be carried out.
If the operation completes successfully the results will be able to be accessed with routes ().
Describes an error which prevented the completion of the operation.
| 常量 | 值 | 描述 |
|---|---|---|
QGeoRouteReply::NoError
|
0
|
没有出现错误。 |
QGeoRouteReply::EngineNotSetError
|
1
|
The routing manager that was used did not have a QGeoRoutingManagerEngine instance associated with it. |
QGeoRouteReply::CommunicationError
|
2
|
An error occurred while communicating with the service provider. |
QGeoRouteReply::ParseError
|
3
|
The response from the service provider was in an unrecognizable format. |
QGeoRouteReply::UnsupportedOptionError
|
4
|
The requested operation or one of the options for the operation are not supported by the service provider. |
QGeoRouteReply::UnknownError
|
5
|
An error occurred which does not fit into any of the other categories. |
Constructs a route reply with a given error and errorString and the specified parent .
[protected]
QGeoRouteReply::
QGeoRouteReply
(const
QGeoRouteRequest
&
request
,
QObject
*
parent
= Q_NULLPTR)
Constructs a route reply object based on request , with the specified parent .
[virtual]
QGeoRouteReply::
~QGeoRouteReply
()
Destroys this route reply object.
[virtual]
void
QGeoRouteReply::
abort
()
Cancels the operation immediately.
This will do nothing if the reply is finished.
[signal]
void
QGeoRouteReply::
aborted
()
This signal is emitted when the operation has been cancelled.
该函数在 Qt 5.9 引入。
另请参阅 abort ().
[protected]
void
QGeoRouteReply::
addRoutes
(const
QList
<
QGeoRoute
> &
routes
)
追加列表 routes to the existing list.
Returns the error state of this reply.
If the result is QGeoRouteReply::NoError then no error has occurred.
另请参阅 setError ().
[signal]
void
QGeoRouteReply::
error
(
QGeoRouteReply::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 。若 errorString is not empty it will contain a textual description of the error.
This signal and QGeoRoutingManager::error () will be emitted at the same time.
注意： Do not delete this reply object in the slot connected to this signal. Use deleteLater () 代替。
注意： 信号 error 在此类中是重载。要使用函数指针句法连接到此信号，必须在静态铸造中指定信号类型，如此范例所示：
connect(geoRouteReply, static_cast<void(QGeoRouteReply::*)(QGeoRouteReply::Error, const QString &)>(&QGeoRouteReply::error), [=](QGeoRouteReply::Error error, const QString &errorString){ /* ... */ });
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 QGeoRouteReply::error () is equal to QGeoRouteReply::NoError .
[signal]
void
QGeoRouteReply::
finished
()
This signal is emitted when this reply has finished processing.
若 error () 等于 QGeoRouteReply::NoError then the processing finished successfully.
This signal and QGeoRoutingManager::finished () will be emitted at the same time.
注意： Do not delete this reply object in the slot connected to this signal. Use deleteLater () 代替。
另请参阅 setFinished ().
Return true if the operation completed successfully or encountered an error which cause the operation to come to a halt.
Returns the route request which specified the route.
Returns the list of routes which were requested.
另请参阅 setRoutes ().
[protected]
void
QGeoRouteReply::
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 () 和 finished () signals to be emitted, in that order.
另请参阅 error ().
[protected]
void
QGeoRouteReply::
setFinished
(
bool
finished
)
Sets whether or not this reply has finished to finished .
若 finished is true, this will cause the finished () 信号被发射。
If the operation completed successfully, QGeoRouteReply::setRoutes () should be called before this function. If an error occurred, QGeoRouteReply::setError () 应该使用以取而代之。
另请参阅 finished ().
[protected]
void
QGeoRouteReply::
setRoutes
(const
QList
<
QGeoRoute
> &
routes
)
Sets the list of routes in the reply to routes .
另请参阅 routes ().