httputils - Error and questions

[cmweb]

Hello everybody,

I'm using httputils to grab about 180 Bitmaps from web sites.

this is my code snippet:

Sub Activity_Create(FirstTime As Boolean)
   Activity.Title = "Copy your Smiley"
   Activity.LoadLayout("mainlayout")
   IconList.Initialize
   IconList = File.ReadList(File.DirAssets,"smileys.txt")
   
   Activity.AddMenuItem("Toggle Notification","mnuNoti")
   Activity.AddMenuItem("About","mnuAbout")
   Activity.AddMenuItem("Download","mnuDownload")
   
   Website.initialize("")
   Activity.AddView(Website,0,0,100%x,100%y)
   Website.Visible = False
   
   merker = 0
   merker2 = 0
   
   y = 10 
   x = 10
   c = 0
   lv = GetDeviceLayoutValues
   hoehe = lv.Height
   breite = lv.Width
   
   scvImages.SetLayout(0,0,100%x,100%y)
   
   n.Vibrate = False

   rueckkehr = "close"

   HttpUtils.CallbackActivity = "Main" 'Current activity name.
    HttpUtils.CallbackJobDoneSub = "JobDone"
   
   If firsttime = True Then
      counter.Visible = True
      counter.Height = hoehe
      counter.width = breite
      counter.top = 1
      counter.Text = "Downloading..."
      HttpUtils.DownloadList("Job1", IconList)
      Else
      Listfill
   End If
   

End Sub

Sub Activity_Resume
    'Check whether a job has finished while the activity was paused.
    If HttpUtils.Complete = True Then JobDone(HttpUtils.Job)
End Sub

Sub UrlDone(Url As String)
    Log(Url & " done")
End Sub

Sub JobDone (Job As String)

 For i = 0 To HttpUtils.Tasks.Size - 1
    counter.Text = i
   s = HttpUtils.GetBitmap(IconList.get(i))
   imgWidth = s.width * 2
   imgheight = s.height * 2
   merker = imgwidth / imgheight
   imgheight = 75
   If merker > 1 Then 
      imgwidth = 90 * merker
      Else
      imgwidth = 90
      End If
   If x > breite - imgwidth Then 
      x = 10
      y = y + 90
      End If
   Dim imvImage As ImageView
   imvImage.Initialize("imvImage")
   imvImage.Gravity=Gravity.FILL
   imvImage.Tag=IconList.Get(i)
   imvImage.Bitmap=s 
   scvImages.Panel.AddView(imvImage,x,y,imgWidth,imgHeight)
   x = x + imgwidth + 30
Next
scvImages.Panel.Height = y + 200
counter.Visible = False
 HttpUtils.Complete = False 'Turn off the complete flag so we won't handle it again if the activity is resumed.
End Sub

It works fine. But: Sometimes, I'm getting the error message for this line:

imgWidth = s.width * 2

Error says, that Bitmap should first be initialized.

Question is: Why?
Most of the time, the code works without any errors. The error just occurs sometimes. It's always the same set of Bitmaps and URLs that should be downloaded.

Any ideas?

Second question:

After the Bitmaps are downloaded - where are they stored? Is it possible to access them and their origin URLs without re-download them again?

I know, that I can access them with HttpUtils.GetBitmap. But how long does that work? After closing the App and restarting it, it seems that this doesn't work. I'm getting the error message, that Map object should first be initialized in line

Sub IsSuccess(URL As String) As Boolean
Return SuccessfulUrls.ContainsKey(URL)
End Sub

of httputils.

Am I missing something? Or is there another way to access the already downloaded bitmap material?

Thanks,

Carsten

 

[Erel]

1) You are not checking that download was successful. It is possible that a certain download has failed. See the HttpUtils tutorial for an example.

2) This code from HttpUtilsService stores the downloaded data:

Sub hc_ResponseSuccess (Response As HttpResponse, TaskId As Int)
   
   cout.Initialize(File.OpenOutput(TempFolder, TaskId, False))
   
   Response.GetAsynchronously("response", cout, _
      True, TaskId)
End Sub

 

[cmweb]

Thank you very much, Erel.

Works now like a charme...

Best regards,

Carsten