QPlaceReply Class
The QPlaceReply class manages an operation started by an instance of QPlaceManager and serves as a base class for more specialized replies. 更多...
| 头文件: | #include <QPlaceReply> |
| qmake: | QT += location |
| 开始支持版本: | Qt 5.6 |
| 基类: | QObject |
| 派生类: | QPlaceContentReply, QPlaceDetailsReply, QPlaceIdReply, QPlaceMatchReply, QPlaceSearchReply, and QPlaceSearchSuggestionReply |
公有类型
| enum | Error { NoError, PlaceDoesNotExistError, CategoryDoesNotExistError, CommunicationError, ..., UnknownError } |
| enum | Type { Reply, DetailsReply, SearchReply, SearchSuggestionReply, ..., MatchReply } |
公有函数
| QPlaceReply(QObject *parent = Q_NULLPTR) | |
| ~QPlaceReply() | |
| QPlaceReply::Error | error() const |
| QString | errorString() const |
| bool | isFinished() const |
| virtual Type | type() const |
- 32 个公有函数继承自 QObject
公有槽函数
| virtual void | abort() |
- 1 个公有槽函数继承自 QObject
信号
| void | aborted() |
| void | error(QPlaceReply::Error error, const QString &errorString = QString()) |
| void | finished() |
- 2 个信号继承自 QObject
受保护的函数
| void | setError(QPlaceReply::Error error, const QString &errorString) |
| void | setFinished(bool finished) |
- 9 个受保护的函数继承自 QObject
其他继承的成员
详细描述
The QPlaceReply class manages an operation started by an instance of QPlaceManager and serves as a base class for more specialized replies.
The QPlaceReply and each of its specialized subclasses manage the state and results of their corresponding operations. The QPlaceReply itself is used for operations that have no results, that is, it only necessary to know if the operation succeeded or failed.
The finished() signal can be used to monitor the progress of an operation. Once an operation is complete, the error() and errorString() methods provide information on whether the operation completed successfully. If successful, the reply will contain the results for that operation, that is, each subclass will have appropriate functions to retrieve the results of an operation.
参见 QPlaceManager.
成员类型
enum QPlaceReply::Error
Describes an error which occurred during an operation.
| Constant | Value | Description |
|---|---|---|
QPlaceReply::NoError | 0 | No error has occurred |
QPlaceReply::PlaceDoesNotExistError | 1 | A specified place could not be found |
QPlaceReply::CategoryDoesNotExistError | 2 | A specified category could not be found |
QPlaceReply::CommunicationError | 3 | An error occurred communicating with the service provider. |
QPlaceReply::ParseError | 4 | The response from the service provider or an import file was in an unrecognizable format |
QPlaceReply::PermissionsError | 5 | The operation failed because of insufficient permissions. |
QPlaceReply::UnsupportedError | 6 | The operation was not supported by the service provider. |
QPlaceReply::BadArgumentError | 7 | . A parameter that was provided was invalid. |
QPlaceReply::CancelError | 8 | The operation was canceled. |
QPlaceReply::UnknownError | 9 | An error occurred which does not fit into any of the other categories. |
enum QPlaceReply::Type
Describes the reply's type.
| Constant | Value | Description |
|---|---|---|
QPlaceReply::Reply | 0 | This is a generic reply. |
QPlaceReply::DetailsReply | 1 | This is a reply for the retrieval of place details |
QPlaceReply::SearchReply | 2 | This is a reply for the place search operation. |
QPlaceReply::SearchSuggestionReply | 3 | This is a reply for a search suggestion operation. |
QPlaceReply::ContentReply | 4 | This is a reply for content associated with a place. |
QPlaceReply::IdReply | 5 | This is a reply that returns an identifier of a place or category. Typically used for place or category save and remove operations. |
QPlaceReply::MatchReply | 6 | This is a reply that returns places that match those from another provider. |
成员函数
QPlaceReply::QPlaceReply(QObject *parent = Q_NULLPTR)
Constructs a reply object with a given parent.
QPlaceReply::~QPlaceReply()
Destroys the reply object.
[virtual slot] void QPlaceReply::abort()
Cancels the operation immediately.
参见 aborted().
[signal] void QPlaceReply::aborted()
This signal is emitted when the operation has been cancelled.
This function was introduced in Qt 5.9.
参见 abort().
QPlaceReply::Error QPlaceReply::error() const
Returns the error code.
参见 setError().
[signal] void QPlaceReply::error(QPlaceReply::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 meant for developers and not end users.
This signal and QPlaceManager::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(placeReply, static_cast<void(QPlaceReply::*)(QPlaceReply::Error, const QString &)>(&QPlaceReply::error), [=](QPlaceReply::Error error, const QString &errorString){ /* ... */ });
QString QPlaceReply::errorString() const
Returns the error string of the reply. The error string is intended to be used by developers only and is not fit to be displayed to an end user.
If no error has occurred, the string is empty.
[signal] void QPlaceReply::finished()
This signal is emitted when this reply has finished processing.
If error() equals QPlaceReply::NoError then the processing finished successfully.
This signal and QPlaceManager::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 QPlaceReply::isFinished() const
Return true if the reply has completed.
[protected] void QPlaceReply::setError(QPlaceReply::Error error, const QString &errorString)
Sets the error and errorString of the reply. This function does not cause the QPlaceReply::error(QPlaceReply::Error, const QString &errorString) signal to be emitted.
参见 error().
[protected] void QPlaceReply::setFinished(bool finished)
Sets the status of whether the reply is finished or not. This function does not cause the finished() signal to be emitted.
参见 finished().
[virtual] Type QPlaceReply::type() const
Returns the type of the reply.