QT网络编程之文件下载 QNetworkRequest QNetworkReply QNetworkAccessManager

最新推荐文章于 2025-05-23 14:30:10 发布

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最新推荐文章于 2025-05-23 14:30:10 发布

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分类专栏： QT实战项目应用文章标签： QNetworkRequest QNetworkReply

本文链接：https://blog.youkuaiyun.com/xiaomucgwlmx/article/details/82623585

该博客介绍了使用QT进行网络编程实现文件下载的过程。通过QFile、QNetworkRequest、QNetworkReply和QNetworkAccessManager类，实现了从指定URL下载文件，并在下载过程中更新进度。在完成下载后，检查文件大小以确保下载成功。

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void FileDownLoad::start()
{
m_file = new QFile(m_filePath, this);//m_filePath下载地址
if (!m_file->open(QIODevice::WriteOnly)) {
emit result(false, tr("Write file error!\n") + m_file->errorString());
return;
}

QUrl u(m_url);
QNetworkRequest request(u);
QNetworkReply *reply = m_accessManager.get(request);
m_reply = reply;
connect(reply, SIGNAL(finished()), this, SLOT(onReplyFinished()));//处理下载结果
connect(reply, SIGNAL(downloadProgress(qint64,qint64)), this, SLOT(updateDataReadProgress(qint64,qint64)));//更新下载进度
}

void FileDownLoad::onReplyFinished()
{
QNetworkReply *reply = dynamic_cast<QNetworkReply *> (sender());
if (!reply){
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