B4A crashing in debug so cant find problem

[harlechguy]

Hi All, I have a project that keeps crashing in debug without any meaningful error message either in the B4A software or the actual application

The application has 3 main parts
1) start up and check if internal database is most recent version - if not download (FTP) newer version
2) download a series of manuals (jpegs). FTP as zip, then unpack.
3) populate a series of labels that are used for navigation
4) populate a panel with pictures (jpegs) based on label click choice

the program fails at the last part

I have attached a copy of the program (zip).

Any ideas much appreciated - many thanks

 

[stevel05]

Have you checked the unfiltered logs? Depending on how many images you are loading you may find an out of memory error.

 

[harlechguy]

Could not see anything in the unfiltered logs. The script fails when loading one picture.

Will keep looking and maybe strip back the code

Thanks

 

[Erel]

In which way does it fail?
If it shows a "force close" message then there must be some related messages in the unfiltered logs.

 

[harlechguy]

Thanks Erel, unfiltered log is quite large and I have not spotted - will run again and have another look - must be missing something as it is a 'force close'

 

[harlechguy]

Hi, have made a little progress over the last week but am still experiencing forced closes

Have narrowed it down a little to the following two subs and the error codes below.

the scenario is the app reads an sql database and based in the choice user makes loads a series of thumbnails.

the user clicks on a thumbnail and it scales to full size within a scroll panel

the error occurs when the user clicks the full size image - at this point the panel is cleared and the series of thumbnails is reloaded - currently am testing with one thumnail expanding to one full size image and then going back to one thumnail - it is at this point the program fails

the error codes appear to indicate that there is a problem with the way I am handling the loading and reloading of both the image and the thumbnail - am I on the right lines - Many thanks






SUBS:

Sub addthumbs(datab, dataa)
Dim cursor1 As Cursor

databholder = datab
dataaholder = dataa
Log(datab & " " & dataa)

Dim foldera As String
Dim c As Int

Dim T As Int
Dim L As Int

T = 15
L = 15

cursor1 = sql1.ExecQuery2("select Manual, Section, Page from Items where Manual = ? and Section = ?", Array As String(datab, dataa))
c = cursor1.RowCount
Dim thumb(c) As ImageView
If cursor1.RowCount=0 Then
Log("no manuals selected")
cursor1.Close
End If

If cursor1.RowCount > 0 Then
For i = 0 To cursor1.RowCount -1
thumb(i).Initialize("thumbclick")
cursor1.Position=i
manuala = cursor1.GetString("Manual")
manuala = manuala.Replace(" ","_")
sectiona = cursor1.GetString("Section")
sectiona = sectiona.Replace(" ","_")
page = cursor1.GetString("Page")
page=page.Replace(" ","_")
foldera = manuala & "/" & sectiona & "/" & page & ".jpeg"
Log(foldera)

'Panel2.AddView(thumb(i),L,5,675,1000)
Panel2.AddView(thumb(i),L,T,135,200)
Log(File.DirRootExternal&"/docbrowser/"&foldera)
thumb(i).Bitmap = LoadBitmap(File.DirRootExternal & "/docbrowser", foldera)
thumb(i).Gravity = Gravity.FILL
If L > 600 Then
L = 5
T = T + 210
Else
L = L + 145
End If
Next
cursor1.close
End If


End Sub

Sub thumbclick_click
Dim tc As ImageView
Dim sv As ScrollView
Dim pn As Panel
clearpanel2

If thumbflag = 0 Then
addthumbs(databholder,dataaholder)
thumbflag = 1
Return
End If

If thumbflag = 1 Then
sv.Initialize(1115)
pn = sv.Panel
sv.BringToFront
pn.BringToFront
tc = Sender
Panel2.AddView(sv,0,0,750,470)
pn.AddView(tc,5,5,750,1110)
thumbflag = 0
End If


End Sub


ERROR CODES:

threadid=1: stack overflow on call to Ljava/lang/reflect/Field;.<init>:VLLLI
method requires 24+20+4=48 bytes, fp is 0x42089318 (24 left)
expanding stack end (0x42089300 to 0x42089000)
Shrank stack (to 0x42089300, curFrame is 0x4208ba50)
Shutting down VM
threadid=1: thread exiting with uncaught exception (group=0x4001d840)
GC_FOR_MALLOC freed 3457 objects / 342056 bytes in 22ms
FATAL EXCEPTION: main
java.lang.StackOverflowError
at java.lang.reflect.Field.<init>(Field.java:85)
at java.lang.reflect.ReflectionAccessImpl.clone(ReflectionAccessImpl.java:42)
at java.lang.ClassCache.deepCopy(ClassCache.java:530)
at java.lang.Class.getDeclaredFields(Class.java:710)
at anywheresoftware.b4a.BA.TypeToString(BA.java:423)
at harlech.docbrowser.main$_node.toString(main.java:215)


FATAL EXCEPTION: main
java.lang.StackOverflowError

java.lang.OutOfMemoryError: bitmap size exceeds VM budget

 

[stevel05]

Have a look at this post, it may help. The link is to the possible solution, but there is more info in the whole thread.

 

[Erel]

The first thing you should do is use LoadBitmapSample instead of LoadBitmap. This alone usually solves memory errors related to images.

 

[harlechguy]

Erel, Steve, thank you for your directions

I have followed the loadbitmapsample route as does not need additional libraries and is a little easier for me to follow

So far this has worked a treat - so thank you very much

For my learning - what are the limits with regards bitmaps?

the bitmap I am usings is 750kb. the loadbitmap sample does show a small amount of quality degradation when I scale the image.

thanks again - help, guidance very appreciated

 

[Erel]

Is your file a BMP file? If not then it's uncompressed size is much larger. It is the uncompressed size that matters when you load a bitmap.

There is no hard limit except of the available process memory.