这个错误是由于未定义的虚函数metaObject，它是Qt元对象系统中的一个标准函数。为了解决这个问题，你需要在HttpServer类中添加Q_OBJECT宏声明，并运行MOC（Meta-Object Compiler）来生成元对象代码。
确保在头文件中添加以下内容：
class HttpServer : public QTcpServer {
Q_OBJECT
public:
explicit HttpServer(QObject *parent = nullptr) : QTcpServer(parent) {}
protected:
void incomingConnection(qintptr socketDescriptor) override;
};
然后将代码分割成两个文件：httpserver.h 和 httpserver.cpp。
httpserver.h:
#ifndef HTTPSERVER_H
#define HTTPSERVER_H
#include <QTcpServer>
class HttpServer : public QTcpServer {
Q_OBJECT
public:
explicit HttpServer(QObject *parent = nullptr);
protected:
void incomingConnection(qintptr socketDescriptor) override;
};
#endif // HTTPSERVER_H
httpserver.cpp:
#include "httpserver.h"
#include <QTcpSocket>
#include <QDebug>
HttpServer::HttpServer(QObject *parent)
: QTcpServer(parent)
{
}
void HttpServer::incomingConnection(qintptr socketDescriptor)
{
QTcpSocket *client = new QTcpSocket(this);
client->setSocketDescriptor(socketDescriptor);
connect(client, &QTcpSocket::readyRead, this, [client]() {
while (client->canReadLine()) {
QByteArray request = client->readLine().trimmed();
qDebug() << "Received HTTP Request: " << request;
QString response = "HTTP/1.1 200 OK\r\nContent-Length: 5\r\n\r\nHello";
client->write(response.toUtf8());
client->flush();
client->waitForBytesWritten();
}
client->close();
});
connect(client, &QTcpSocket::disconnected, client, &QTcpSocket::deleteLater);
}
确保在.pro文件中包含正确的头文件和源文件：
SOURCES += main.cpp httpserver.cpp
HEADERS += httpserver.h
然后重新编译并尝试运行您的应用程序。这应该能够解决链接错误。
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