分段上传在 QObject 中不起作用已移至线程

Multipart Upload not working in QObject moved to thread

本文关键字：线程 不起作用 QObject 分段      更新时间：2023-10-16

我正在尝试使用Qt中的MultiPart将图像上传到我的网络服务器。当我通过按钮从主窗口运行下面的代码时，它工作正常。

当我尝试在从 QObject 继承到线程的类中实现确切的代码时，它没有到达 te SIGNAL/SLOT，也没有上传任何文件。

谁能指出我的错误在哪里？已经有一段时间了，没有任何积极的结果。

谢谢！

线程/工作线程类的实现

#include "screenshotworker.h"
#include "session.h"
#include "json.h"
#include "mainwindow.h"
#include <QtNetwork>
#include <QByteArray>
#include <QMessageBox>
#include <QDesktopWidget>
#include <QApplication>

ScreenshotWorker::ScreenshotWorker(QObject *parent) : QObject(parent)
{
}
void ScreenshotWorker::DoSetup(QThread *cThread, Session *aSession)
{
   session = aSession;
   connect(cThread, SIGNAL(started()), this, SLOT(DoWork()));
}
void ScreenshotWorker::DoWork()
{
    while(session->sessActive)
    {
        QHttpMultiPart *multiPart = new QHttpMultiPart(QHttpMultiPart::FormDataType);
        QHttpPart textPart;
        textPart.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant("form-data; name="session""));
        textPart.setBody(QByteArray::number(session->session_id));
        QHttpPart imagePart;
        imagePart.setHeader(QNetworkRequest::ContentTypeHeader, QVariant("image/png"));
        imagePart.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant("form-data; name="userfile"; filename="screen.png""));
        QFile *file = new QFile("screen.png");
        file->open(QIODevice::ReadOnly);
        imagePart.setBodyDevice(file);
        file->setParent(multiPart); // we cannot delete the file now, so delete it with the multiPart
        multiPart->append(textPart);
        multiPart->append(imagePart);
        QUrl url("http://........");
        QNetworkRequest request(url);
        QNetworkAccessManager *manager = new QNetworkAccessManager();
        reply = manager->post(request, multiPart);
        multiPart->setParent(reply); // delete the multiPart with the reply

        connect(reply, SIGNAL( uploadProgress(qint64, qint64) ), this, SLOT( uploadProgress(qint64,qint64) ) ) ;
        connect(reply, SIGNAL(finished()), this, SLOT(uploadDone()));
        sleep(10);
     }
}
void ScreenshotWorker::uploadProgress(qint64 bytesSent, qint64 bytesTotal) {
    qDebug() << "Uploaded" << bytesSent << "of" << bytesTotal;
}
void ScreenshotWorker::uploadDone() {
    qDebug() << "Finished" << reply->errorString() <<reply->attribute( QNetworkRequest::HttpStatusCodeAttribute).toInt();
    qDebug()<<reply->readAll();
    reply->deleteLater();
}

按下按钮调用它，启动线程。

QThread *cThread2 = new QThread();
ScreenshotWorker *cWorker2 = new ScreenshotWorker();
cWorker2->DoSetup(cThread2, mSession);
cWorker2->moveToThread(cThread2);
cThread2->start();

多亏了上面的评论，我能够通过添加事件循环来解决这个问题。

QEventLoop loop;        
connect(reply, SIGNAL(finished()),&loop, SLOT(quit()));
loop.exec();
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