Qt QNetworkAccessManager不发出信号

Question

使用类似http://example.com的URL调用函数CheckSite(),它初始化QNetworkAccessManager对象和connect()槽和信号.

manger-> get()调用似乎有效(它生成http流量),但在请求结束时不调用插槽replyFinished().

这段代码出了什么问题？

#include <QtCore>
#include <QtNetwork>

class ClientHandler : public QObject
{
Q_OBJECT
  QNetworkAccessManager *manager;
private slots:
  void replyFinished(QNetworkReply *);
public:
  void CheckSite(QString url);
};

void ClientHandler::replyFinished(QNetworkReply *reply) { qDebug() << "DONE"; }

void ClientHandler::CheckSite(QString url) {
  QUrl qrl(url);
  manager = new QNetworkAccessManager(this);
  connect(manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(replyFinished(QNetworkReply*)));
  manager->get(QNetworkRequest(qrl));
}

Answer 1

没有什么。我把它包裹起来，使它功能齐全并且工作正常：

// placed in client.cpp
#include <QtDebug>
#include <QCoreApplication>

/* YOUR CODE */

int main(int argc, char *argv[])
{
        QCoreApplication app(argc, argv);
        ClientHandler handler;
        handler.CheckSite("www.google.com");
        return app.exec();

}

#include "client.moc"

它按预期输出“DONE”。也许您正在检查的网站真的没有返回？也许它需要身份验证或产生ssl 错误？