C++ 多线程服务器无法从Qt中的客户端读取消息 尝试在QT中实现多线程服务器，请考虑以下事项：BR> 在SocketThread类中： SocketThread::SocketThread(qintptr descriptor, QObject *parent) : QThread(parent), socketDescriptor(descriptor) { socket = new QTcpSocket(); socket->setSocketDescriptor(socketDescriptor); socket->moveToThread(this); connect(socket, &QTcpSocket::readyRead, [this]() { qDebug() << socket->readAll(); }); //trying to read messages from clients } class SocketThread : public QThread { Q_OBJECT public: SocketThread(qintptr descriptor, QObject *parent = 0); ~SocketThread(); QTcpSocket *socket; qintptr socketDescriptor; }; Connection::Connection(QObject *parent) : QTcpServer(parent) { this->listen(QHostAddress::Any, 6666); }

奇怪的是，如果我加上这一行：

连接（socketThread，&socketThread:：started，&{socketThread->socket->write（“Hello！”）；}）//创建线程时向客户端写入消息

然后套接字将不会从客户端读取消息。如果我删除该行，套接字将从客户端读取消息。

我希望服务器在创建线程时向客户端发送消息，并从客户端读取消息。你怎样才能解决这个问题

编辑：

SocketThread::SocketThread(qintptr descriptor, QObject *parent)
    : QThread(parent), socketDescriptor(descriptor)
{
    socket = new QTcpSocket();
    socket->setSocketDescriptor(socketDescriptor);

    socket->moveToThread(this);

    connect(socket, &QTcpSocket::readyRead, [this]() { qDebug() << socket->readAll(); }); //trying to read messages from clients
} 

class SocketThread : public QThread
{
    Q_OBJECT
public:
    SocketThread(qintptr descriptor, QObject *parent = 0);
    ~SocketThread();
    QTcpSocket *socket;
    qintptr socketDescriptor;
};

Connection::Connection(QObject *parent) : QTcpServer(parent)
{
    this->listen(QHostAddress::Any, 6666);
}

SocketThread头文件：

SocketThread::SocketThread(qintptr descriptor, QObject *parent)
    : QThread(parent), socketDescriptor(descriptor)
{
    socket = new QTcpSocket();
    socket->setSocketDescriptor(socketDescriptor);

    socket->moveToThread(this);

    connect(socket, &QTcpSocket::readyRead, [this]() { qDebug() << socket->readAll(); }); //trying to read messages from clients
} 

class SocketThread : public QThread
{
    Q_OBJECT
public:
    SocketThread(qintptr descriptor, QObject *parent = 0);
    ~SocketThread();
    QTcpSocket *socket;
    qintptr socketDescriptor;
};

Connection::Connection(QObject *parent) : QTcpServer(parent)
{
    this->listen(QHostAddress::Any, 6666);
}

在连接构造函数中：

SocketThread::SocketThread(qintptr descriptor, QObject *parent)
    : QThread(parent), socketDescriptor(descriptor)
{
    socket = new QTcpSocket();
    socket->setSocketDescriptor(socketDescriptor);

    socket->moveToThread(this);

    connect(socket, &QTcpSocket::readyRead, [this]() { qDebug() << socket->readAll(); }); //trying to read messages from clients
} 

class SocketThread : public QThread
{
    Q_OBJECT
public:
    SocketThread(qintptr descriptor, QObject *parent = 0);
    ~SocketThread();
    QTcpSocket *socket;
    qintptr socketDescriptor;
};

Connection::Connection(QObject *parent) : QTcpServer(parent)
{
    this->listen(QHostAddress::Any, 6666);
}

---

以及在

main.cpp

文件中创建连接对象。这就像所有的代码一样

可能无关，但。。。在将任何东西连接到

QThread:：started

信号之前，为什么要调用

socketThread->start（）

？@G.M.不知道调用

socketThread->start（）之间是否有区别

before

started

signal和before

started

signal.@TheodoreTang提供一个：）如果在连接到

QThread:：started

信号之前调用

socketThread->start（）

，我认为不能保证您能捕捉到该信号。@TheodoreTang QThread不是一个线程，它是一个线程处理程序（阅读文档），只有run（）方法是属于该线程的部分。