多线程下载特别容易崩溃

MultiplethreadDownload/MultiplethreadDownload.pro

@@ -9,11 +9,13 @@ CONFIG += c++17
 #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
 
 SOURCES += \
+    filedownloadworker.cpp \
     main.cpp \
     utils.cpp \
     widget.cpp
 
 HEADERS += \
+    filedownloadworker.h \
     utils.h \
     widget.h
 

MultiplethreadDownload/REAMDE.md

@@ -4,3 +4,11 @@
 开始下载数据：  0~630426 -> writePos Start 0
 开始下载数据：  630427~1260853 -> writePos Start 630427
 开始下载数据：  1260854~1891280 -> writePos Start 1260854
+
+
+文件大小为： 89937570
+开始下载文件
+开始下载数据： " 0~22484391 -> writePos Start 0"
+开始下载数据： " 22484392~44968783 -> writePos Start 22484392"
+开始下载数据： " 44968784~67453175 -> writePos Start 44968784"
+开始下载数据： " 67453176~89937570 -> writePos Start 67453176

MultiplethreadDownload/filedownloadworker.cpp

@@ -0,0 +1,6 @@
+#include "filedownloadworker.h"
+
+FileDownloadWorker::FileDownloadWorker(QObject *parent) : QObject(parent)
+{
+
+}

MultiplethreadDownload/filedownloadworker.h

@@ -0,0 +1,16 @@
+#ifndef FILEDOWNLOADWORKER_H
+#define FILEDOWNLOADWORKER_H
+
+#include <QObject>
+
+class FileDownloadWorker : public QObject
+{
+    Q_OBJECT
+public:
+    explicit FileDownloadWorker(QObject *parent = nullptr);
+
+signals:
+
+};
+
+#endif // FILEDOWNLOADWORKER_H

MultiplethreadDownload/widget.cpp

@@ -164,14 +164,15 @@ void Widget::multiDownload(const QString &url, qint64 fileSize, const QString &f
             .arg(pair.first).arg(pair.second).arg(writePos);
         connect(reply, &QNetworkReply::readyRead, [&lock, &writePos, &file, &bytesReceived, reply](){
             QByteArray data = reply->readAll();
-            lock.lock();
-//            qDebug() << "调整文件的数据指针："  << writePos;
+            {
+                QMutexLocker mLock(&lock);
+        //            qDebug() << "调整文件的数据指针："  << writePos;
                 file.seek(writePos);
                 file.write(data);
                 bytesReceived += data.size();
                 qDebug() << QString("%1, %2, %3")
                     .arg(writePos).arg(bytesReceived).arg(data.size());
-            lock.unlock();
+            }
             writePos += data.size();
         });
         connect(reply, &QNetworkReply::finished, &event, &QEventLoop::quit);