why When i run desktop application using qt web assembly it show Application exit with code 1 ?

[Qt embedded developer]

Hi i have created client web assembly application which receive the message sent from the server.

#include "mainwindow.h"

#include <QApplication>
#include <QtWebSockets/QtWebSockets>
#include <QDebug>
#include <QProcess>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QString lIp= getLIpAdd();
    if(lIp.isEmpty()){
        qDebug()<<"Failed to rtetrieve the local IP address.";
        return 1;
    }

    QWebSocket socket;
    socket.open(QUrl("ws://127.0.0.1:12345"));

    QObject::connect(&socket, &QWebSocket::connected, [&socket] () {
        qDebug()<< "connected to server ";
        socket.sendTextMessage("Hello, server ! ");
    });

    QObject::connect(&socket, &QWebSocket::textMessageReceived, [&socket] (const QString &message) {
        qDebug()<< "Message received from server: "<< message;
        socket.close();
        QApplication::quit();
    });

    QObject::connect(&socket, &QWebSocket::disconnected,[&socket] () {
        qDebug()<<"Client disconnected from server" ;
    });
    MainWindow w;
    w.show();
    return a.exec();
}

Now when i run this application in desktop environment it runs perfectly. But when i run this application using qt web assembly kit. it throws the error and not show the ui.

when i inspect the code i found below errors into that

unreachable code after return statement qtloader.js:548:4
Calling stub instead of sigaction() 2 qtloader.js:382:25
Failed to rtetrieve the local IP address. qtloader.js:382:25
Assertion failed: the runtime was exited (use NO_EXIT_RUNTIME to keep it alive after main() exits) qtloader.js:372:25
Assertion failed: the runtime was exited (use NO_EXIT_RUNTIME to keep it alive after main() exits) qtloader.js:382:25
Uncaught RuntimeError: abort(Assertion failed: the runtime was exited (use NO_EXIT_RUNTIME to keep it alive after main() exits)) at jsStackTrace@http://localhost:30000/qtloader.js line 443 > eval:1887:17
stackTrace@http://localhost:30000/qtloader.js line 443 > eval:1904:16
abort@http://localhost:30000/qtloader.js line 443 > eval:1662:44
assert@http://localhost:30000/qtloader.js line 443 > eval:716:10
Module.dynCall_vii@http://localhost:30000/qtloader.js line 443 > eval:14034:9
dynCall_vii_84@http://localhost:30000/qtloader.js line 443 > eval line 6844 > Function:4:12
qtResizeAllScreens@http://localhost:30000/qtloader.js line 443 > eval line 6655 > Function:8:8
    abort http://localhost:30000/qtloader.js line 443 > eval:1668
    assert http://localhost:30000/qtloader.js line 443 > eval:716
    dynCall_vii http://localhost:30000/qtloader.js line 443 > eval:14034
    dynCall_vii_84 http://localhost:30000/qtloader.js line 443 > eval line 6844 > Function:4
    qtResizeAllScreens http://localhost:30000/qtloader.js line 443 > eval line 6655 > Function:8
qtloader.js line 443 > eval:1668:9

Can anybody guide me what can help me for resolve this error and run it using qt web assembly.

[jsulm]

@Qt-embedded-developer I don't think you can start other processes in web assembly applications. There is anyway no need to do such hacks just to get local IP, see for example https://stackoverflow.com/questions/13835989/get-local-ip-address-in-qt

[jsulm]

@Qt-embedded-developer said in why When i run desktop application using qt web assembly it show Application exit with code 1 ?:

getLIpAdd

What is this?

[Qt embedded developer]

@jsulm it's function

QString getLIpAdd(){
    QProcess p;
    p.start("hostname", QStringList() << "-I");
    p.waitForFinished();
    return QString(p.readAll().trimmed());
}

[jsulm]

@Qt-embedded-developer I don't think you can start other processes in web assembly applications. There is anyway no need to do such hacks just to get local IP, see for example https://stackoverflow.com/questions/13835989/get-local-ip-address-in-qt

[Qt embedded developer]

@Qt-embedded-developer I have commented that function in my code. now my server is receiving the my sent message but the client code's console output i can not able to see. as well as my UI is not get shown in the html file. it only show exit code 0 with qt image

[jsulm]

@Qt-embedded-developer Why do you call QApplication::quit() in slot connected to textMessageReceived?

[Qt embedded developer]

@jsulm Shall i need to remove it ? .i am learning to use this web socket. so one sample i have found and so i use that sample in my code. Can you tell me what changes i need to make so i can see the ui.

[jsulm]

@Qt-embedded-developer Are you aware that QApplication::quit() terminates your application?

[Qt embedded developer]

@jsulm yes thanks now my application show the ui.