handling exceptions in Qt

[sattu]

the best solution is to kill it as soon as possible to prevent serious damage to hardware, system or even your application data.

Actually Wysota this problem is not exactly from application side because the wav files got corrupted. That's why I wanted to know how to handle such situations as they are not in our control.

If you are after playing some sound then you can play it using an external process (e.g. external player). This way, even if it crashes, your main program can continue safely.

Correct but then again not an option in our case . Sticking to QSound as of now

[wysota]

Actually Wysota this problem is not exactly from application side because the wav files got corrupted.

Of course it is the fault of the application. The library you are using for playing sounds apparently can't handle invalid files and causes a crash.

Correct but then again not an option in our case

Why not?

[sattu]

Of course it is the fault of the application. The library you are using for playing sounds apparently can't handle invalid files and causes a crash.

Well, we are using QSound. So, maybe I will see if I can work on the library part

[pradeepreddyg95]

with QProcess you can restart your appliaction when it crashed this is most useful in embedded linux .
Example:

#include "applicationcontrol.h"
 
ApplicationControl::ApplicationControl(QObject *parent) :
    QObject(parent)
{
 
 
    m_pProcess = new QProcess*[2];
 
    for(int i = 0; i < 2; i++)
    {
        m_pProcess[i] = new QProcess();
 
        m_pProcess[i]->setProcessChannelMode(QProcess::MergedChannels);
        connect(m_pProcess[i], SIGNAL(finished(int, QProcess::ExitStatus)),this, SLOT(processFinished(int, QProcess::ExitStatus)));
        connect(m_pProcess[i], SIGNAL(error(QProcess::ProcessError)),this, SLOT(processError(QProcess::ProcessError)));
    }
 
    m_pProcess[0]->setObjectName("Server");
    m_pProcess[1]->setObjectName("Client");
 
 
 
    QTimer::singleShot(5,this,SLOT(StartJob()));
 
    m_nServerStarted = false;
    m_nClientStarted = false;
}
void ApplicationControl::StartJob()
{
    m_pProcess[0]->start("/root/CCU/Server");
    m_pProcess[1]->start("/root/CCU/Client");
 
}
 
void ApplicationControl::processError(QProcess::ProcessError error)
{
 
    QProcess *pProcess = qobject_cast<QProcess*>(sender());
 
    qDebug() << "Application Name " << pProcess->objectName();
 
    if (error == QProcess::FailedToStart)
    {
       qDebug(("Unable to Start Job ..."));
       return ;
    }
    else if (error == QProcess::Crashed)
    {
 
         qDebug() << "Program Crashed error " << error << QDateTime::currentDateTime().toString();
    }
    else if (error == QProcess::Timedout)
    {
        qDebug() << "Program Timedout error " << error << QDateTime::currentDateTime().toString();
 
    }
    else if (error == QProcess::WriteError)
    {
        qDebug() << "Program WriteError error " << error << QDateTime::currentDateTime().toString();
 
    }
    else if (error == QProcess::ReadError)
    {
        qDebug() << "Program ReadError error " << error << QDateTime::currentDateTime().toString();
 
    }
    else
    {
        qDebug() << "Program Unknow error " << error << QDateTime::currentDateTime().toString();
 
    }
 
}
void ApplicationControl::processFinished(int exitCode, QProcess::ExitStatus exitStatus)
{
/* If crashed Restart Application */
     QProcess *pProcess = qobject_cast<QProcess*>(sender());
        qDebug() << "Application Name " << pProcess->objectName();
    if(exitStatus == 0)
    {
        qDebug() << "exit Success Restarting " << pProcess->objectName();
 
            return ;
 
    }
 
    if (exitStatus == QProcess::CrashExit)
    {
        qDebug() << "Program Crashed " << QDateTime::currentDateTime().toString();
       // return ;
 
    }
    else if (exitCode != 0)
    {
      qDebug() << "Failed to Start" << QDateTime::currentDateTime().toString();
    }
 
    if(pProcess->objectName() == "Server")
    {
        m_pProcess[0]->start("/root/CCU/Server");
    }
    else if(pProcess->objectName() == "Client")
    {
        m_pProcess[1]->start("/root/CCU/Client");
    }
 
 
}

#include "applicationcontrol.h"

ApplicationControl::ApplicationControl(QObject *parent) :
    QObject(parent)
{

  
    m_pProcess = new QProcess*[2];

    for(int i = 0; i < 2; i++)
    {
        m_pProcess[i] = new QProcess();

        m_pProcess[i]->setProcessChannelMode(QProcess::MergedChannels);
        connect(m_pProcess[i], SIGNAL(finished(int, QProcess::ExitStatus)),this, SLOT(processFinished(int, QProcess::ExitStatus)));
        connect(m_pProcess[i], SIGNAL(error(QProcess::ProcessError)),this, SLOT(processError(QProcess::ProcessError)));
    }
  
    m_pProcess[0]->setObjectName("Server");
    m_pProcess[1]->setObjectName("Client");


   
    QTimer::singleShot(5,this,SLOT(StartJob()));

    m_nServerStarted = false;
    m_nClientStarted = false;
}
void ApplicationControl::StartJob()
{
    m_pProcess[0]->start("/root/CCU/Server");
    m_pProcess[1]->start("/root/CCU/Client");

}

void ApplicationControl::processError(QProcess::ProcessError error)
{

    QProcess *pProcess = qobject_cast<QProcess*>(sender());

    qDebug() << "Application Name " << pProcess->objectName();

    if (error == QProcess::FailedToStart)
    {
       qDebug(("Unable to Start Job ..."));
       return ;
    }
    else if (error == QProcess::Crashed)
    {

         qDebug() << "Program Crashed error " << error << QDateTime::currentDateTime().toString();
    }
    else if (error == QProcess::Timedout)
    {
        qDebug() << "Program Timedout error " << error << QDateTime::currentDateTime().toString();

    }
    else if (error == QProcess::WriteError)
    {
        qDebug() << "Program WriteError error " << error << QDateTime::currentDateTime().toString();

    }
    else if (error == QProcess::ReadError)
    {
        qDebug() << "Program ReadError error " << error << QDateTime::currentDateTime().toString();

    }
    else
    {
        qDebug() << "Program Unknow error " << error << QDateTime::currentDateTime().toString();

    }

}
void ApplicationControl::processFinished(int exitCode, QProcess::ExitStatus exitStatus)
{
/* If crashed Restart Application */
     QProcess *pProcess = qobject_cast<QProcess*>(sender());
        qDebug() << "Application Name " << pProcess->objectName();
    if(exitStatus == 0)
    {
        qDebug() << "exit Success Restarting " << pProcess->objectName();
      
            return ;
        
    }

    if (exitStatus == QProcess::CrashExit)
    {
        qDebug() << "Program Crashed " << QDateTime::currentDateTime().toString();
       // return ;

    }
    else if (exitCode != 0)
    {
      qDebug() << "Failed to Start" << QDateTime::currentDateTime().toString();
    }

    if(pProcess->objectName() == "Server")
    {
        m_pProcess[0]->start("/root/CCU/Server");
    }
    else if(pProcess->objectName() == "Client")
    {
        m_pProcess[1]->start("/root/CCU/Client");
    }


}

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