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改变锁的位置，解决多线程下载错误的问题

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This commit is contained in:
metanoia1989 2021-01-10 23:51:20 +08:00
parent be0b63c209
commit 5ad594a028
1 changed files with 4 additions and 4 deletions
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8
MultiplethreadDownload/widget.cpp
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@ -149,6 +149,7 @@ void Widget::multiDownload(const QString &url, qint64 fileSize, const QString &f
vec[threadCount-1].second = fileSize; // 余数部分加入最后一个
qint64 bytesReceived = 0; // 下载接收的总字节数
QMutex lock;
// 任务队列
auto mapCaller = [&, this](const QPair<qint64, qint64>& pair) -> qint64 {
QEventLoop event;
@ -159,16 +160,15 @@ void Widget::multiDownload(const QString &url, qint64 fileSize, const QString &f
request.setRawHeader("Range", QString("bytes=%1-%2").arg(pair.first).arg(pair.second).toLocal8Bit());
QNetworkReply *reply = mgr.get(request);
qint64 writePos = pair.first;
QMutex lock;
qDebug() << "开始下载数据：" << QString(" %1~%2 -> writePos Start %3")
.arg(pair.first).arg(pair.second).arg(writePos);
connect(reply, &QNetworkReply::readyRead, [&lock, &writePos, &file, &bytesReceived, reply](){
QByteArray data = reply->readAll();
{
QMutexLocker mLock(&lock);
// qDebug() << "调整文件的数据指针：" << writePos;
// file.seek(writePos);
// file.write(data);
// 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());