完成并发请求下载

src/downloadworker.h

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+#ifndef DOWNLOADWORKER_H
+#define DOWNLOADWORKER_H
+
+#include <QObject>
+#include <QList>
+#include <QFile>
+#include <QNetworkReply>
+
+class DownloadWorker : public QObject
+{
+    Q_OBJECT
+public:
+    explicit DownloadWorker(QObject *parent = nullptr);
+    void setIdentifier(int identifier);
+    void setParamter(const QString &url, QPair<qint64, qint64> range, QFile *flle);
+    qint64 getReceivedPos();
+
+public slots:
+    void doWork();
+    void doStop();
+    void dataReady();
+    void slotFinish();
+    void handleProcess(qint64, qint64);
+
+signals:
+    void resultReady(int identifier, QByteArray data);
+    void testSignals();
+    void workFinished();
+    void downloadProcess();
+
+private:
+    int identifier;
+    QString url;
+    qint64 startPos;
+    qint64 endPos;
+    qint64 receivedPos = 0;
+    QNetworkReply *reply;
+    QNetworkAccessManager *mgr;
+    QFile *file;
+};
+
+class DownloadController : public QObject
+{
+    Q_OBJECT
+public:
+    explicit DownloadController(QObject *parent = nullptr);
+    ~DownloadController();
+    void setFilename(QString filename);
+    void setThreadNum(int threadNum);
+    void startDownload(const QString &url);
+    void stopDownload();
+    qint64 getFileSize(const QString& url);
+
+public slots:    
+    void handleProcess();
+    void chunkDownloadFinish();
+
+signals:
+    void errorOccur(const QString& msg);
+    void downloadProcess(qint64, qint64);
+    void downloadFinished();
+
+private:
+    int threadNum;
+    QString filename;
+    qint64 fileSize;
+    QVector<QPair<qint64, qint64>> ranges;
+    QFile *file;
+    QList<DownloadWorker*> workers;
+    int finish = 0;
+};
+
+#endif // FILEDOWNLOADWORKER_H