我想查看 GET 请求的结果。据我了解,这段代码应该可以做到。我做错了什么?
void getDoc::on_pushButton_2_clicked()
{
manager = new QNetworkAccessManager(this);
connect(manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(replyFinished(QNetworkReply*)));
manager->get(QNetworkRequest(QUrl("http://www.google.com")));
}
void getDoc::replyFinished(QNetworkReply *reply)
{
qDebug() << reply->error(); //prints 0. So it worked. Yay!
QByteArray data=reply->readAll();
qDebug() << data; // This is blank / empty
QString str(data);
qDebug() << "Contents of the reply: ";
qDebug() << str; //this is blank or does not print.
}
代码编译并运行良好。它只是行不通。
最佳答案
尝试将您的 replyFinished 插槽修改为如下所示:
QByteArray bytes = reply->readAll();
QString str = QString::fromUtf8(bytes.data(), bytes.size());
int statusCode = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();
然后您可以打印 statusCode 以查看是否收到 200 响应:
qDebug() << QVariant(statusCode).toString();
如果您收到 302 响应,您将收到状态重定向。您将需要像这样处理它:
if(statusCode == 302)
{
QUrl newUrl = reply->attribute(QNetworkRequest::RedirectionTargetAttribute).toUrl();
qDebug() << "redirected from " + replyUrl + " to " + newUrl.toString();
QNetworkRequest newRequest(newUrl);
manager->get(newRequest);
return;
}
我在遇到状态代码 302 时返回,因为我不想执行该方法的其余部分。
希望对您有所帮助!
关于c++ - Qt QNetworkReply 总是空的,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/17686561/