Creating an object of QVideoWidget closes my mediaplayer app .

umutgurbuz

Hi guys, I am trying the make a mediaplayer app that has the basic mediaplayer features.
It is all fine when dealing with mp3 files . I am using QMediaPlayer and QMediaPlaylist in my cpp code . I have a login page main.qml and when user id and password is correct it launches the mediplayer.qml where i call my cpp functions. The problem is that now i am trying to play a video but if i create an object of QVideoWidget , it causes my mediaplayer.qml not to launch and main.qml to close when i clicked the enter button of my login page. I do not even have to use to QVideoWidget object ,just creating it is enough for this problem to occur. What might be causing this problem. Sorry if I kept it too long .Thanks in advance .

umutgurbuz

@sgaist The problem was the QGuiApplication in my main.cpp , i turned it to QApplication and it works fine.

And lastly what should i do to use my applicationwindow as my videowidget. I want my video to play on my app like normal mediaplayers, not to open another window for it. Thanks for your kind effort.

jsulm

@umutgurbuz said in Creating an object of QVideoWidget closes my mediaplayer app .:

just creating it is enough for this problem to occur

Can you show how you create it?
Are there any warnings/errors in the console when running the app?

umutgurbuz

 QVideoWidget *vw = new QVideoWidget;

This is how i create it. There is no error or warning. I am creating it in my header file and now i realized if i create it in my cpp file it does not even launches main.qml(still no error or warnings)

jsulm

@umutgurbuz said in Creating an object of QVideoWidget closes my mediaplayer app .:

QVideoWidget *vw = new QVideoWidget;

This creates a local variable which is destroyed when it goes out of scope...

umutgurbuz

Now , I am creating it in the function that i am using it . I can see the list in my mediplayer.qml and pick the media that i want to play . Now , it closes when i click on the media name.

SGaist

Hi,

You should share more of your code. It's currently next to impossible to find out what is happening based only on your explanation.

umutgurbuz

Yes you are right , I should have thought of that .
This is the function in my mediaplayer.cpp
:```

  void Mediaplayer::playvideo(int num)
     {   
  flag=1;
  vidplaylist->setCurrentIndex(num);
  if(player->state()==QMediaPlayer::PlayingState)
  {
      player->stop();
  }
  QVideoWidget vw ;
  player->setVideoOutput(&vw);
  vw.setGeometry(100,100,640,360);
  vw.show();
  vidplayer->play();
  }

this is my main.qml

import QtQuick 2.0
import QtQuick.Controls 2.3
import qt.player 1.0
import QtQuick.Window 2.10
import idpasswd.qt 1.0
ApplicationWindow {
    id: root
    width: 640
    height: 480
    visible: true
    title:("Mediaplayer Login Page")

    Idpasswd {
        id: id
    }
    Idpasswd {
        id: passwd
    }

    Button {
        x: 40
        y: 318
        width: 97
        height: 36
        text: qsTr("Guest")
        onClicked: {
        var component = Qt.createComponent("guest.qml");
        newone = component.createObject(rect);
        newone.show();
        }
    }

    TextField {

        anchors.verticalCenterOffset: -133
        anchors.horizontalCenterOffset: -180
        placeholderText: qsTr("User name")
        anchors.centerIn: parent
        onTextChanged: id.userName = text
    }
    TextField {
        x: 40
        y: 167

        placeholderText: qsTr("Password")
        anchors.horizontalCenter:parent
        onTextChanged: id.password=text
    }

    Rectangle{
        x: 40
        y: 256
        width:97
        height:36
        id: rect
        Button{
        text: qsTr("Enter")
        anchors.fill: parent
        property variant newone;  
            onClicked: {                
               if(id.checkLogin(id.userName,id.password))
               {
                   var component = Qt.createComponent("mediaplayer.qml");
                   newone = component.createObject(rect);
                   newone.show();
                }
               else
               {
                   console.log("Invalid id or password")
               }             
            }
        }
}

    Button{
        x: 167
        y: 256
        text: qsTr("Change Password")
        font.pointSize: 8
        font.family: "Times New Roman"
        focusPolicy: Qt.NoFocus
        width:97
        height:36
    }

}

And this is where i am trying to call the function in mediaplayer.qml.

     ScrollView {
              id:mp4scroll
              x: 50
              y:96
              width: 250; height: 200
              visible:false
              ListView {
                  id:listmp4
                  model: player.createplaylistmp4()
                  delegate: ItemDelegate {
                      id:listdelegmp4
                      text: player.sendNamesvid(index)
                      font.pixelSize: 10
                      onClicked: player.playvideo(index), playimage.source="qrc:/pause.png"
                  }
              }
          }

JonB

@umutgurbuz said in Creating an object of QVideoWidget closes my mediaplayer app .:

QVideoWidget vw ;
player->setVideoOutput(&vw);
vw.setGeometry(100,100,640,360);
vw.show();
vidplayer->play();
}

I don't use any of this, so I hope I'm right:
That QVideoWidget vw goes out of scope at the }. player->setVideoOutput(&vw); still references it. Kerplunk?

umutgurbuz

@jonb I do not understand what you mean. What should i try ?

SGaist

What @JonB means is that the lifetime of your QVideoWidget ends at the end of the method because you are creating it on the stack. Thus you are passing a pointer to an object that gets destroyed.

The question is: why are you re-creating the QVideoWidget each time ?

umutgurbuz

I was actually creating it in my header file once but i wanted to see what changes when i create it in my method. The result is that when i create it in my header, it closes when i click the enter button that launches my mediaplayer.qml. When i create QVideoWidget in my method, it can launch my mediaplayer.qml but this time it closes when i pick the video on the window(scroll view list view part). What is the right thing to do ? Where and how should i create it ?

umutgurbuz

@sgaist The problem was the QGuiApplication in my main.cpp , i turned it to QApplication and it works fine.

And lastly what should i do to use my applicationwindow as my videowidget. I want my video to play on my app like normal mediaplayers, not to open another window for it. Thanks for your kind effort.

umutgurbuz

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