Qt官方示例-Http

发表于

通过get接口对url资源下载，并显示下载进度。

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0x00 Http请求

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void HttpWindow::startRequest(const QUrl &requestedUrl)
{
    ...
    reply = qnam.get(QNetworkRequest(url));
    connect(reply, &QNetworkReply::finished, this, &HttpWindow::httpFinished);
    connect(reply, &QIODevice::readyRead, this, &HttpWindow::httpReadyRead);

    ProgressDialog *progressDialog = new ProgressDialog(url, this);
    progressDialog->setAttribute(Qt::WA_DeleteOnClose);
    connect(progressDialog, &QProgressDialog::canceled, this, &HttpWindow::cancelDownload);
    connect(reply, &QNetworkReply::downloadProgress, progressDialog, &ProgressDialog::networkReplyProgress);
    connect(reply, &QNetworkReply::finished, progressDialog, &ProgressDialog::hide);
    ...
}

0x01 下载进度

  使用以下接口获取下载进度。

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void QNetworkReply::downloadProgress(qint64 bytesReceived, 
                                     qint64 bytesTotal);

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0x02 网络验证(如有需要)

  绑定authenticationRequired信号：

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connect(&qnam, &QNetworkAccessManager::authenticationRequired,
        this, &HttpWindow::slotAuthenticationRequired);

  验证动作：

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oid HttpWindow::slotAuthenticationRequired(QNetworkReply *, QAuthenticator *authenticator)
{
    ...
    // Did the URL have information? Fill the UI
    // This is only relevant if the URL-supplied credentials were wrong
    ui.userEdit->setText(url.userName());
    ui.passwordEdit->setText(url.password());

    if (authenticationDialog.exec() == QDialog::Accepted) {
        authenticator->setUser(ui.userEdit->text());
        authenticator->setPassword(ui.passwordEdit->text());
    }
}

0x03 关于更多

  • 在QtCreator软件可以找到：

what_find

  • 或在以下Qt安装目录找到

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    C:\Qt\{你的Qt版本}\Examples\{你的Qt版本}\network\http

  • 相关链接

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    https://doc.qt.io/qt-5/qtnetwork-http-example.html

  • Qt君公众号回复『Qt示例』获取更多内容。