多部分上传在 QObject 中不起作用移动到线程

Question

我正在尝试使用 Qt 中的 MultiPart 将图像上传到我的网络服务器。当我通过一个按钮从我的 MainWindow 运行下面的代码时，它工作正常。

当我尝试在从 QObject 继承的类中实现确切的代码时，该类正在被移动到一个线程中，它没有达到 TE SIGNAL/SLOT 并且没有文件被上传。

谁能指出我的错误在哪里？研究了一段时间，没有任何积极的结果。

谢谢！

线程/worker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();
}

在按下按钮时调用它，启动线程。

QThread *cThread2 = new QThread();
ScreenshotWorker *cWorker2 = new ScreenshotWorker();

cWorker2->DoSetup(cThread2, mSession);
cWorker2->moveToThread(cThread2);
cThread2->start();

Answer 1

感谢上面的 cmets，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();