qthttps下载-QT开发中文网

在 Qt 中，如果你希望使用 HTTPS 进行文件下载，你仍然可以使用 QNetworkAccessManager 类来实现。下面是一个简单的示例，展示如何通过 HTTPS 下载文件。

使用 Qt 的 QNetworkAccessManager 进行 HTTPS 下载

确保你的项目文件 (.pro) 中包含了必要的模块：

QT += core gui network

然后，可以创建一个简单的程序，通过 HTTPS 下载文件：

#include <QCoreApplication>
#include <QNetworkAccessManager>
#include <QNetworkReply>
#include <QUrl>
#include <QObject>
#include <QFile>

class HttpsDownloader : public QObject {
    Q_OBJECT

public:
    HttpsDownloader(const QString &url, const QString &outputFilePath) {
        manager = new QNetworkAccessManager(this);
        reply = manager->get(QNetworkRequest(QUrl(url)));

        connect(reply, &QNetworkReply::finished, this, &HttpsDownloader::onFinished);
        connect(reply, &QNetworkReply::downloadProgress, this, &HttpsDownloader::onDownloadProgress);

        // 准备输出文件
        outputFile.setFileName(outputFilePath);
        outputFile.open(QIODevice::WriteOnly);
    }

private slots:
    void onFinished() {
        if (reply->error() == QNetworkReply::NoError) {
            // 写入文件
            outputFile.write(reply->readAll());
            outputFile.close();
            qDebug("Download finished successfully.");
        } else {
            qDebug() << "Error:" << reply->errorString();
        }
        
        reply->deleteLater();
        qApp->quit();  // 结束应用程序
    }

    void onDownloadProgress(qint64 bytesReceived, qint64 bytesTotal) {
        if (bytesTotal > 0) {
            double percentage = static_cast<double>(bytesReceived) / bytesTotal * 100;
            qDebug() << "Downloaded:" << percentage << "%";
        }
    }

private:
    QNetworkAccessManager *manager;
    QNetworkReply *reply;
    QFile outputFile;
};

int main(int argc, char *argv[]) {
    QCoreApplication app(argc, argv);

    QString url = "https://example.com/file.zip"; // 替换为你要下载的文件URL（HTTPS）
    QString outputPath = "downloaded_file.zip";   // 保存到本地的路径

    HttpsDownloader downloader(url, outputPath);

    return app.exec();
}

#include "main.moc"