QNetworkAdapter::Post working in Main Application but Not from a Library

[pp1010]

I want to http post a file to a server though a library used by my application. As the post failed (WireShark shows data not sent from Client).

So, I shifted the code to a function in the Main application...and viola it works... (Data received by Server)

What am I missing, QEventLoop? If yes, how to use it. Tried, but am lost..

Here is the code (used in the Main Application):

//loginscreenmain.h 
class loginscreenmain : public QMainWindow
{
    Q_OBJECT
 
public:
    explicit loginscreenmain(QWidget *parent = 0);
    ~loginscreenmain();
    QNetworkAccessManager* m_pNAM;
    QNetworkReply *m_Reply;
    QNetworkRequest m_Request;
 
    void SendPacket();
 
private slots:
    void on_pushButton_2_clicked();
    void on_pushButton_clicked();
    void on_pushButton_2_pressed();
    void on_pushButton_pressed();
 
private:
    Ui::loginscreenmain *ui;
};

//loginscreenmain.h 
class loginscreenmain : public QMainWindow
{
    Q_OBJECT

public:
    explicit loginscreenmain(QWidget *parent = 0);
    ~loginscreenmain();
    QNetworkAccessManager* m_pNAM;
    QNetworkReply *m_Reply;
    QNetworkRequest m_Request;

    void SendPacket();
    
private slots:
    void on_pushButton_2_clicked();
    void on_pushButton_clicked();
    void on_pushButton_2_pressed();
    void on_pushButton_pressed();

private:
    Ui::loginscreenmain *ui;
};

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void loginscreenmain::SendPacket()
{
    CRequestGenerator *oReqGen = new CRequestGenerator(); //Mediator class between Google Protobuf classes and Client Code
 
    CMyRequest *oReq = oReqGen->createMyRequest(); //CMyRequest is Google Protobuf generated class
 
    m_pNAM = NULL;
    m_pNAM = new QNetworkAccessManager();
 
    int checksize = oReq->ByteSize();
 
    std::string outputstring;
    outputstring = oReq->SerializeAsString(); //Google Protobuf API
    checksize = outputstring.size();
 
    //An UTF8 encoded QByteArray
    QByteArray byteArray(outputstring.c_str(), outputstring.length());
    checksize = byteArray.size();
 
    QUrl oUrl = QUrl(QString("http://blahblahblah")); //URI given here...Tested to Work
 
    m_Request.setUrl(oUrl);
    m_Request.setRawHeader("function", "PerformAddition" ); //Protobuf Specific
 
    if(m_pNAM)
    {
        m_Reply =  m_pNAM->post(m_Request,byteArray);
    }
}

void loginscreenmain::SendPacket()
{
    CRequestGenerator *oReqGen = new CRequestGenerator(); //Mediator class between Google Protobuf classes and Client Code

    CMyRequest *oReq = oReqGen->createMyRequest(); //CMyRequest is Google Protobuf generated class

    m_pNAM = NULL;
    m_pNAM = new QNetworkAccessManager();

    int checksize = oReq->ByteSize();

    std::string outputstring;
    outputstring = oReq->SerializeAsString(); //Google Protobuf API
    checksize = outputstring.size();

    //An UTF8 encoded QByteArray
    QByteArray byteArray(outputstring.c_str(), outputstring.length());
    checksize = byteArray.size();

    QUrl oUrl = QUrl(QString("http://blahblahblah")); //URI given here...Tested to Work

    m_Request.setUrl(oUrl);
    m_Request.setRawHeader("function", "PerformAddition" ); //Protobuf Specific

    if(m_pNAM)
    {
        m_Reply =  m_pNAM->post(m_Request,byteArray);
    }
}

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---

Added after 27 minutes:

Found the solution: QEventLoop was needed to make the post synchronous.

if(m_pNAM)
    {
        m_pReply =  m_pNAM->post(m_pRequest,m_byteArray);
        QEventLoop eventLoop;
        QObject::connect(m_pReply, SIGNAL(finished()), &eventLoop, SLOT(quit()));
        eventLoop.exec();
        std::cout << "finished" << std::endl; //request finished here
    }

if(m_pNAM)
    {
        m_pReply =  m_pNAM->post(m_pRequest,m_byteArray);
        QEventLoop eventLoop;
        QObject::connect(m_pReply, SIGNAL(finished()), &eventLoop, SLOT(quit()));
        eventLoop.exec();
        std::cout << "finished" << std::endl; //request finished here
    }

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Can also refer: http://www.qtcentre.org/threads/3511...and-QEventLoop