qt多线程http请求

可以使用Qt的QNetworkAccessManager类来实现多线程http请求。具体步骤如下：

1. 创建QNetworkAccessManager对象
2. 创建QNetworkRequest对象，设置请求的url和其他参数
3. 发送请求，获取QNetworkReply对象
4. 在QNetworkReply的finished信号中处理请求结果

以下是一个简单的示例代码：

class HttpWorker : public QObject
{
    Q_OBJECT
public:
    HttpWorker(QObject *parent = nullptr) : QObject(parent) {}

public slots:
    void doRequest(const QUrl &url)
    {
        QNetworkAccessManager *manager = new QNetworkAccessManager(this);
        QNetworkRequest request(url);
        QNetworkReply *reply = manager->get(request);

        connect(reply, &QNetworkReply::finished, this, [reply]() {
            if (reply->error() == QNetworkReply::NoError) {
                QByteArray data = reply->readAll();
                // 处理请求结果
            } else {
                // 处理请求错误
            }
            reply->deleteLater();
        });
    }
};

// 在主线程中创建HttpWorker对象，并在其他线程中调用doRequest方法
QThread *thread = new QThread;
HttpWorker *worker = new HttpWorker;
worker->moveToThread(thread);
thread->start();

QMetaObject::invokeMethod(worker, "doRequest", Qt::QueuedConnection,
                          Q_ARG(QUrl, QUrl("http://example.com")));

// 在程序退出时停止线程
QObject::connect(qApp, &QCoreApplication::aboutToQuit, thread, &QThread::quit);
QObject::connect(thread, &QThread::finished, worker, &QObject::deleteLater);```