Error: Cannot assign [undefined] to QUrl

[Naveen_D]

@sierdzio When i print the items, i get the following output:
qml: items are: QQuickFolderListModel(0xf12ac0)

[sierdzio]

Ah, not very helpful. Try printing out all items in a loop, then.

[Naveen_D]

@sierdzio i am not getting how to print the items in foldermodellist i tried with the following code but didn't get output:

for (var j=0; j<items.count;j++){
                    console.log("items"+ items(j))
                }

is this the correct way ?

[sierdzio]

Almost :-)

for (var j=0; j<items.count;j++){
    console.log("item:"+ items.get(index,"filePath"))
}

Maybe that will help us pinpoint the issue.

[Naveen_D]

@sierdzio Hi, i tried printing those items, but i am getting the same error again (Error: Cannot assign [undefined] to QUrl), also when i try to print those items, i am not able to find the auto get method for items(i.e items.get() method) and it is not entering the for loop.
what can be the possible solution? thanks

[sierdzio]

Please try:

• print items.count and items.get(0, "filePath")
• rewrite items to be a normal QML component and not a property (see example code in the docs) and see if it works
• make sure the path is OK :-)

[Naveen_D]

@sierdzio

print items.count and items.get(0, "filePath")

output:
qml: items count >> 0
qml: items at 0 position >> undefined

rewrite items to be a normal QML component and not a property (see example code in the docs) and see if it works

i made the following changes, pls rectify if there is any mistake

FolderListModel{
            id: items
            folder: "/home/ubuntu/Documents/Sample_Examples_Qt_Qml/DummyMusicPlayer/Songs"
            nameFilters: ["*.mp3"]
        }

after making changes i am getting the following output:

qml: Entered init function
qml: calling index function
qml: entered setindex function
qml: else part
qml: items count >> 0
qml: items at 0 position >> undefined
qrc:/main.qml:58: Error: Cannot assign [undefined] to QUrl

[sierdzio]

OK, so now at least we know this:

• issue is not related to QtMultimedia
• issue is with FolderListModel
• "Cannot assign [undefined]" is there, because items is empty (no .mp3 files are detected in Songs folder)

Try using URL instead of path:

folder: "file:///home/ubuntu/Documents/Sample_Examples_Qt_Qml/DummyMusicPlayer/Songs"

Relative and absolute paths should work, but apparently something fails here. Also, of course, please make sure there are some MP3s in that dir.

[Naveen_D]

@sierdzio yup, now its detecting the mp3 files, i am getting the following output,

qml: Entered init function
qml: calling index function
qml: entered setindex function
qml: else part
qml: items count >> 5
qml: items at 0>> /home/ubuntu/Documents/Sample_Examples_Qt_Qml/DummyMusicPlayer/Songs/Cinema_Choopista-StarMusiQ.Com.mp3
qml: before playing the song

But i am not sure the song is playing or not, because i am not getting sound. Does it require anything else for this?

[sierdzio]

Nice, I'm glad to hear that problem is solved.

@Naveen_D said in Error: Cannot assign [undefined] to QUrl:

But i am not sure the song is playing or not, because i am not getting sound. Does it require anything else for this?

I'm not familiar with QtMultimedia, I can't help here unfortunately. My first guesses are:

• check if you have gstreamer 0.1 installed
• check if you have mp3 codecs installed (mp3lame or something)
• check some QtMultimedia examples in Qt Creator - does the sound work there?

[Naveen_D]

Thanks for the information,
But previously i had tried to play songs using this and it was working fine, i found out that when i directly give source in the media player and play it is working fine the song is playing, but when i give the folderlistmodel path using the get method it is not working.
also i tried to print the path, when i give the direct source path, the path printed is the URL path but when it takes through the folderlistmodel, it is the normal path

i.e Direct source path with song if i give, the path set is :
"file:///home/ubuntu/Documents/Sample_Examples_Qt_Qml/DummyMusicPlayer/Songs/David Guetta - Love Don't Let Me Go (Memorax Remix) [FREE].mp3"

and through folderlistmodel with the index, the path set is :
"/home/ubuntu/Documents/Sample_Examples_Qt_Qml/DummyMusicPlayer/Songs/David Guetta - Love Don't Let Me Go (Memorax Remix) [FREE].mp3"

Can anyone please suggest the possible solution.
Thanks

[Naveen_D]

I have solved the issue,

mediaplayer.source=items.get(index,"filePath");

I was using filePath, instead of this i used fileURL, the issue got resolved.

@sierdzio thanks alot for your help.

Thanks

[sierdzio]

Cool, good to hear that :) Please mark the topic as solved, too.