C++ 将QByteArray读写到QDataSteam
通过C++ 将QByteArray读写到QDataSteam,c++,qt,qbytearray,qdatastream,C++,Qt,Qbytearray,Qdatastream,通过QDataStream发送QByteArray时遇到问题。 我创建了一个用于存储序列化消息并通过套接字发送的类,该类如下所示: #ifndef SERIALIZEDMESSAGE_H #define SERIALIZEDMESSAGE_H #include <QByteArray> #include <QDataStream> #include <QDebug> class SerializedMessage { public: SerializedM
QDataStream
发送QByteArray
时遇到问题。
我创建了一个用于存储序列化消息并通过套接字发送的类,该类如下所示:
#ifndef SERIALIZEDMESSAGE_H
#define SERIALIZEDMESSAGE_H
#include <QByteArray>
#include <QDataStream>
#include <QDebug>
class SerializedMessage
{
public:
SerializedMessage();
SerializedMessage(int type, QByteArray data);
friend QDataStream &operator<<(QDataStream &out, const SerializedMessage &message);
friend QDataStream &operator >>(QDataStream &in, SerializedMessage &message);
QByteArray dataArray() const;
void setDataArray(const QByteArray &dataArray);
private:
int m_type;
QByteArray m_dataArray;
};
SerializedMessage::SerializedMessage()
{
}
SerializedMessage::SerializedMessage(int type, QByteArray data)
:m_type(type), m_dataArray(data)
{
}
QByteArray SerializedMessage::dataArray() const
{
return m_dataArray;
}
void SerializedMessage::setDataArray(const QByteArray &dataArray)
{
m_dataArray = dataArray;
}
QDataStream &operator<<(QDataStream &out, const SerializedMessage &message)
{
out << qint32(message.m_type);
qDebug() << "write type" << message.m_type;
out << qint32(message.m_dataArray.length());
qDebug() << "write data lenght" << message.m_dataArray.length();
int bytesWritten = out.writeRawData(message.m_dataArray.data(), message.m_dataArray.length());
qDebug() << bytesWritten << "bytes written";
qDebug() << "write data base64" << message.m_dataArray.toBase64();
return out;
}
QDataStream &operator >>(QDataStream &in, SerializedMessage &message)
{
qint32 type;
qint32 dataLength;
QByteArray dataArray;
char * tmp;
in >> type >> dataLength;
qDebug() << "read type" << type;
qDebug() << "read data lenght" << dataLength;
int bytesRead = in.readRawData(dataArray.data(), dataLength);
qDebug() << bytesRead << "bytes read";
qDebug() << "read data length" << dataArray.length();
qDebug() << "read data base64" << dataArray.toBase64();
message = SerializedMessage(type, dataArray);
return in;
}
要正确运行此测试,您需要TextMessage
class
#ifndef TEXTMESSAGE_H
#define TEXTMESSAGE_H
#include <QString>
#include <QDataStream>
#include "serializedmessage.h"
class TextMessage
{
public:
TextMessage(const QString & sender, const QString & message);
SerializedMessage toSerializedMessage();
static TextMessage fromSerializedMessage(const SerializedMessage &msg);
QString sender() const;
void setSender(const QString &sender);
QString message() const;
void setMessage(const QString &message);
private:
QString m_sender;
QString m_message;
};
#include "textmessage.h"
TextMessage::TextMessage(const QString &sender, const QString &message)
: m_sender(sender), m_message(message)
{
}
TextMessage TextMessage::fromSerializedMessage(const SerializedMessage & msg)
{
QString sender;
QString message;
QDataStream stream(msg.dataArray());
stream >> sender >> message;
TextMessage textMessge(sender, message);
return textMessge;
}
QString TextMessage::sender() const
{
return m_sender;
}
void TextMessage::setSender(const QString &sender)
{
m_sender = sender;
}
QString TextMessage::message() const
{
return m_message;
}
void TextMessage::setMessage(const QString &message)
{
m_message = message;
}
SerializedMessage TextMessage::toSerializedMessage()
{
QByteArray data;
QDataStream stream(&data, QIODevice::WriteOnly);
stream << m_sender << m_message;
SerializedMessage message(1, data);
return message;
}
#endif // TEXTMESSAGE_H
此外,调试读写运算符显示,
out.writeRawData(message.m_dataArray.data(),message.m_dataArray.length())
写入与在.readRawData(dataArray.data(),dataLength)中读取的数据量相同的数据量代码>。我不太清楚发生了什么事。如果您有任何帮助,我将不胜感激。您的问题在operator>>(QDataStream&,SerializedMessage&)
。在尝试使用QDataStream::readRawData
向其中写入字节之前,必须确保QByteArray
的大小正确:
QDataStream &operator >>(QDataStream &in, SerializedMessage &message)
{
qint32 type;
qint32 dataLength;
QByteArray dataArray;
in >> type >> dataLength;
dataArray.resize(dataLength); // <-- You need to add this line.
int bytesRead = in.readRawData(dataArray.data(), dataLength);
// Rest of function goes here.
}
QDataStream&operator>>(QDataStream&in,SerializedMessage&message)
{
秦T32型;
qint32数据长度;
QByteArray数据阵列;
在>>中键入>>数据长度;
调整大小(dataLength)//
FAIL! : Serialization_test::serializedMessageFromArray() Compared values are not the same
Actual (txtMessage.sender()): "sender"
Expected (outText.sender()) : ""
QDataStream &operator >>(QDataStream &in, SerializedMessage &message)
{
qint32 type;
qint32 dataLength;
QByteArray dataArray;
in >> type >> dataLength;
dataArray.resize(dataLength); // <-- You need to add this line.
int bytesRead = in.readRawData(dataArray.data(), dataLength);
// Rest of function goes here.
}