c++ - QTcpServer如何从客户端socket中读取数据

Question

我试图用 C++/Qt 实现一个 tcp 套接字服务器。 首先，clientConnection 本地声明确实有效。

QTcpSocket *clientConnection = tcpServer->nextPendingConnection();

但是，当我试图在头文件中用私有(private) QTcpSocket 类声明套接字而不是将其声明为本地类时，为了在 ReadReady() 中使用 QTcpSocket->read，我遇到了错误。怎么会出现这些问题？

void Server::respondNewConnection()
{
    clientConnection = tcpServer->nextPendingConnection();
    connect(clientConnection, &QAbstractSocket::disconnected,
        clientConnection, &QObject::deleteLater);
    connect(clientConnection, SIGNAL(readyRead()), this, SLOT(ReadyRead()));

    clientConnection->write("[server]Welcome to server...", 100);
    qDebug() << "02[server]Welcome to server..."<<endl;
    statusLabel->setText(tr("test!"));


}

void Server::ReadyRead(){

qDebug() << "04[server]Ready to Read..." << endl;

/*
char buffer[100];
const int buffer_size = 100;
tcpSocket->read(buffer, buffer_size);
qDebug() << "05[server]Message from client: " << buffer << endl;
*/
}

Answer 1

我认为您可能需要添加前向声明:

class QTcpSocket;

在您出错的文件的顶部。