我也应该连接到QNetworkReply :: error()吗?

问题描述

我创建了一个POST请求，并连接到完成()信号:

I have created a POST request and I connect to the finished() signal:

QNetworkReply *reply = manager->post(request, postData.encodedQuery());
connect(reply, SIGNAL(finished()), this, SLOT(accept()));

我希望在POST请求完成时得到通知，无论请求是成功还是失败.

I want to be notified when the POST request has finished, regardless of whether it failed or succeeded.

我在文档中注意到，还有一个 QNetworkReply :: error()信号，我是否也需要连接到它，还是在所有情况下都将调用finished()?

I have noticed in the documentation that there is also a QNetworkReply::error() signal, do I need to connect to it, too, or will finished() be called in all cases?

推荐答案

Qt文档状态:

当回复检测到处理错误时，将发出此信号. finish()信号可能会跟随，表明 连接结束.

This signal is emitted when the reply detects an error in processing. The finished() signal will probably follow, indicating that the connection is over.

根据我在Qt来源中看到的(最近正在检查绝对相同的问题)，在error()之后的每个地方，之后都有一个finish()调用.在5.1.0中，我没有找到一个没有错误的地方，而不是Finished()

From what I've seen in Qt sources (was checking absolutely same issue recently), everywhere after error(), there is a finished() call afterwards. In 5.1.0 I haven't found a place where error is not followed by finished()

例如

void QNetworkReplyImpl::close()
{
    Q_D(QNetworkReplyImpl);
    if (d->state == QNetworkReplyImplPrivate::Aborted ||
        d->state == QNetworkReplyImplPrivate::Finished)
        return;

    // stop the download
    if (d->backend)
        d->backend->closeDownstreamChannel();
    if (d->copyDevice)
        disconnect(d->copyDevice, 0, this, 0);

    QNetworkReply::close();

    // call finished which will emit signals
    d->error(OperationCanceledError, tr("Operation canceled"));
    d->finished();
}

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