java qt服务器/客户端数据传输
我创建了一个客户端（由JAVA创建）和一个服务器（由qt/c++创建），但是我遇到了数据传输问题（我认为格式有问题）。
服务器端代码：
void Pirate::DateArrived()
{
QTcpSocket *socket = qobject_cast<QTcpSocket *>(sender());
QDataStream in (socket);
qDebug()<< socket->bytesAvailable();// here it give me the number of chars i sent in this ex:3
QString cmd ;
in >> cmd;
qDebug()<< cmd.size(); // here it always stay 0
qDebug() << cmd; // always ""
}
public void SendData(String data) throws IOException
{
OutputStream theOutput = socket.getOutputStream();
OutputStreamWriter out = new OutputStreamWriter(theOutput);
out.write("abc");
out.flush();
}
I created a client (created by JAVA) and a server (by qt/c++), but I have a data transfer problem (something wrong with format I think).
The server side code:
void Pirate::DateArrived()
{
QTcpSocket *socket = qobject_cast<QTcpSocket *>(sender());
QDataStream in (socket);
qDebug()<< socket->bytesAvailable();// here it give me the number of chars i sent in this ex:3
QString cmd ;
in >> cmd;
qDebug()<< cmd.size(); // here it always stay 0
qDebug() << cmd; // always ""
}
public void SendData(String data) throws IOException
{
OutputStream theOutput = socket.getOutputStream();
OutputStreamWriter out = new OutputStreamWriter(theOutput);
out.write("abc");
out.flush();
}
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根据 docs，当您反序列化
QString，预计数据将包含以字节为单位的字符串长度 (quint32)，后跟 UTF-16 格式的数据。According to the docs, when you deserialize a
QString, it is expected that the data will consist of the string length in bytes (quint32) followed by the data in UTF-16.