B4J Question Image Downloader and memory

[TomDuncan]

Hi,
I have a routines that downloads images from my server to a tableview.
Each time I call this routine I loose heaps of ram.
What I assume is the memory used in the creation of the table is not freed before it is loaded again.
Any thoughts.

    tblImages.Items.Clear
    tblImages.SetColumns(Array As String("id", "Name","Image"))
    Dim im As Map
    im.Initialize
    If AllImages.IsInitialized Then
        If AllImages.Size>0 Then AllImages.Clear
    Else
        AllImages.Initialize
    End If
    ' fill here
    Dim jp As JSONParser
    jp.Initialize(Json)
    If jp <> Null Then
        Dim mz As Map = jp.NextObject
        Dim lst As List = mz.Get("json")
        For i = 0 To lst.Size -1
            Dim m As Map = lst.Get(i)
            m.Put("updt",0)
                Dim row(3) As Object
                row(0) = m.Get("id")

                Dim p As AnchorPane
                p.Initialize("")
                p.LoadLayout("EditImage")
                labFileName.Text = m.Get("filename")
                edtName.Text = m.Get("name")
                edtAltName.Text = m.Get("alt")
                edtName.Tag = i
                edtAltName.Tag = i
                cbDelete.Checked = False
                cbDelete.Tag = i
                row(1) = p
                AllImages.Add(m) ' add info to list
                Dim img As ImageView
                img.Initialize("me")
                im.Put(img, Serverlink & "/images/" & m.Get("filename"))
                row(2) = img   
                tblImages.Items.Add(row)
        Next
        Dim id As ImageDownloader
        id.Initialize
        id.Download(im)

        tblImages.SetColumnWidth(0,0)
        tblImages.SetColumnWidth(1,300)
        tblImages.SetColumnWidth(2,tblImages.Width - 320)
        tblImages.Visible = True

Tom

 

[Erel]

ImageDownloader does cache the downloaded images in memory.

However you are recreating the ImageDownloader each time so the references will be released.

Do you eventually get an out of memory error?

 

[TomDuncan]

Yep, sure did. Surprised me.
Had a look in the task manager and lost heaps each time I selected that tab.
What would happen if I re create it each time?
Tom

 

[Erel]

You need to find which component hold references to the "old" images. Try to recreate the TableView each time and see whether it solves this.

Another thing that you should try is to use the same ImageDownloader and clear its cache at some point (make the cache map a public variable).

 

[TomDuncan]

Will have a look in the morning. But yes a new table view each time is the easiest way.
Tom