Question

我有python在本地网络代码上发送简单的字符串如下：

import socket
import os

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
stringTosend = ("Hello,World")
print(stringTosend)
sock.connect(('192.168.2.39', 42207))
try:
 sock.sendall(stringTosend)
except socket.error:
 print 'Send failed'
 sys.exit()
print'Sent'

在我的QT中，我设置了标签，显示“Helloworld” 我能在qt做什么？谢谢

Answer 1

使用Qt时，您应该遵循事件驱动架构。 Qt的事件循环应始终准备好receive new events。通常，您可以将插槽连接到任何QObject的信号，以获得特定事件发生的通知，并且您的插槽应包含该信号触发时运行的代码。

从Qt5开始，您还可以连接到C++11 lambdas（而不是插槽）。我已经利用它来使代码尽可能小。请注意，在实际项目中，您可能需要将其分成不同的类，每个类都有自己的责任，以使事情更易于维护。。

#include <QtCore>
#include <QtNetwork>
#include <QtWidgets>

int main(int argc, char* argv[]) {
    QApplication a(argc, argv);
    //the label to show received string
    QLabel label("no connection yet");
    //tcp server object to listen for incoming connections
    QTcpServer tcpServer;
    //connect the server's newConnection signal to get notified for new connections
    QObject::connect(&tcpServer, &QTcpServer::newConnection, [&tcpServer, &label] {
        //get a new tcp socket for the incoming connection
        QTcpSocket* socket = tcpServer.nextPendingConnection();
        //change the label to reflect the new state
        label.setText("received connection");
        //connect the socket's readyRead signal to get notified
        //when data is available on the socket
        QObject::connect(socket, &QTcpSocket::readyRead, [socket, &label] {
            //receive available data from the socket
            QByteArray received = socket->readAll();
            //change label's text (assuming text is encoded using UTF-8)
            label.setText(QString::fromUtf8(received));
            //close and delete the socket when done
            socket->close();
            socket->deleteLater();
        });
    });
    //start listening on port 42207
    if(!tcpServer.listen(QHostAddress::Any, 42207))
        label.setText("server listen error");
    //show the label
    label.show();
    //start event loop
    return a.exec();
}

Qt如何接收Python发送字符串

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