QModbusReply Class

The QModbusReply class contains the data for a request sent with a QModbusClient derived class. 更多...

头: #include <QModbusReply>
CMake: find_package(Qt6 REQUIRED COMPONENTS SerialBus)
target_link_libraries(mytarget PRIVATE Qt6::SerialBus)
qmake: QT += serialbus
继承: QObject

公共类型

enum ReplyType { Raw, Common, Broadcast }

公共函数

QModbusReply (QModbusReply::ReplyType type , int serverAddress , QObject * parent = nullptr)
QModbusDevice::Error error () const
QString errorString () const
QList<QModbusDevice::IntermediateError> intermediateErrors () const
bool isFinished () const
QModbusResponse rawResult () const
QModbusDataUnit result () const
int serverAddress () const
QModbusReply::ReplyType type () const

信号

void errorOccurred (QModbusDevice::Error error )
void finished ()

详细描述

成员类型文档编制

enum QModbusReply:: ReplyType

This enum describes the possible reply type.

常量 描述
QModbusReply::Raw 0 The reply originates from a raw Modbus request. See QModbusClient::sendRawRequest
QModbusReply::Common 1 The reply originates from a common read, write or read/write request. See QModbusClient::sendReadRequest , QModbusClient::sendWriteRequest and QModbusClient::sendReadWriteRequest
QModbusReply::Broadcast 2 The reply originates from a Modbus broadcast request. The serverAddress () 会返回 0 finished () signal will be emitted immediately.

成员函数文档编制

QModbusReply:: QModbusReply ( QModbusReply::ReplyType type , int serverAddress , QObject * parent = nullptr)

Constructs a QModbusReply object with a given type and the specified parent .

The reply will be sent to the Modbus client represented by serverAddress .

QModbusDevice::Error QModbusReply:: error () const

Returns the error state of this reply.

另请参阅 errorString () 和 errorOccurred ().

[signal] void QModbusReply:: errorOccurred ( QModbusDevice::Error error )

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. In case of a QModbusDevice::ProtocolError the rawResult () function can be used to obtain the original Modbus exception response to get the exception code.

Note: Do not delete this reply object in the slot connected to this signal. Use deleteLater () 代替。

另请参阅 error () 和 errorString ().

QString QModbusReply:: 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.

另请参阅 error () 和 errorOccurred ().

[signal] void QModbusReply:: finished ()

This signal is emitted when the reply has finished processing. The reply may still have returned with an error.

After this signal is emitted, there will be no more updates to the reply's data.

注意: 不要在槽中删除连接到此信号的对象。使用 deleteLater ().

还可以使用 isFinished () to check if a QNetworkReply has finished even before you receive the finished() signal.

另请参阅 isFinished () 和 error ().

[since 6.0] QList < QModbusDevice::IntermediateError > QModbusReply:: intermediateErrors () const

Returns the list of intermediate errors that might have happened during the send-receive cycle of a Modbus request until the QModbusReply reports to be finished.

该函数在 Qt 6.0 引入。

bool QModbusReply:: isFinished () const

返回 true 当回复已完成或被中止。

另请参阅 finished () 和 error ().

QModbusResponse QModbusReply:: rawResult () const

Returns the raw response of a Modbus request.

If the request has not finished then the returned QModbusResponse instance is invalid.

另请参阅 type () 和 result ().

QModbusDataUnit QModbusReply:: result () const

Returns the preprocessed result of a Modbus request.

For read requests as well as combined read/write requests send via QModbusClient::sendReadWriteRequest () it contains the values read from the server instance.

If the request has not finished, has failed with an error or was a write request then the returned QModbusDataUnit instance is invalid.

注意: type () of the reply is QModbusReply::Broadcast , the return value will always be invalid. If the type () of the reply is QModbusReply::Raw , the return value might be invalid depending on the implementation of QModbusClient::processPrivateResponse ().

另请参阅 type (), rawResult (),和 QModbusClient::processPrivateResponse ().

int QModbusReply:: serverAddress () const

Returns the server address that this reply object targets.

QModbusReply::ReplyType QModbusReply:: type () const

Returns the type of the reply.

注意: If the type of the reply is QModbusReply::Raw , the return value of result () will always be invalid.

另请参阅 result () 和 rawResult ().