#include QtWidgets#include QtNetworkclass Client public QWidget Q_OBJECTpublic ClientQWidget parent = nullptr QWidgetparent QPushButton connectButton = new QPushButton连接; textE

This is a simple client application using Qt to connect to a server and send a user ID. The server will then send back a suggestion, which will be displayed in a QTextEdit widget.

The main function creates a QApplication object and a Client object, and then shows the client window. The QApplication object handles the event loop and allows the application to run. The Client class is a subclass of QWidget and represents the client window.

In the constructor of the Client class, a QPushButton and a QTextEdit widget are created. The QPushButton is labeled "连接" (Connect), and the QTextEdit is used to display the suggestion received from the server. The connectButton is connected to the connectToServer slot using the clicked signal.

The connectToServer slot is called when the connectButton is clicked. It creates a QTcpSocket object and connects it to the server at IP address 127.0.0.1 and port 8080. If the connection is successful, it sends the user ID to the server and waits for the server to send back a suggestion. The suggestion is then displayed in the textEdit widget. If the connection fails, an error message is displayed in the textEdit widget.

After the connection is handled, the socket is closed.

The main function creates an instance of the Client class, shows it, and starts the event loop by calling app.exec().