B4R Question For-Next error after 16 cycle in JoinStrings

petr4ppc · Oct 5, 2019

Dear friend please for advice:

I have code:

B4X:

Dim buffer() As Byte = "hallo how are xyz I am fine and you?"
For i = 0 To buffer.Length-1
Dim cbtx(1) As Byte
byteconvert.ArrayCopy2(buffer,i,cbtx,0,1)
receivebyte = byteconvert.StringFromBytes(cbtx)
allbytesasstringarehere= JoinStrings(Array As String(allbytesasstringarehere, receivebyte)) 
next

But I get this error after i=16 ("z") in word "xyz"

Exception (3):
epc1=0x4020e161 epc2=0x00000000 epc3=0x00000000 excvaddr=0x400293c1 depc=0x00000000
>>>stack>>>
ctx: sys
sp: 3ffffd00 end: 3fffffb0 offset: 01a0
3ffffea0: 40000f3d 00000023 00000000 3ffe8b08
3ffffeb0: 3ffe8b08 4022079c 00000010 4020e258
3ffffec0: 00000000 4021924c 00003637 4022079c
3ffffed0: 00000000 4bc6a7f0 40100564 000035eb
3ffffee0: 00000000 00000000 4bc6a7f0 40217b90
3ffffef0: 003e58da 00000013 00003637 40217bcc
3fffff00: 4021924c 000035eb 3fff2114 402191f1
3fffff10: 4021924c 000035eb 3fff1dac 4021927f
3fffff20: 3ffe8b08 00d25e16 60000600 40217bf6
3fffff30: 00d2a1bc 3ffee6b0 3fff1dac 402193f4
3fffff40: 4024d60c 3ffee688 3ffee6b0 60000600
3fffff50: 00d2a1bc 3ffee6b0 3ffee688 4024d619
3fffff60: 4024d65e 3fffdab0 00000000 3fffdcb0
3fffff70: 3ffee6d0 3fffdad0 3fff1a08 4020c8ef
3fffff80: 40000f49 40000f49 3fffdab0 40000f49
3fffff90: 40000e19 40001878 00000002 3fff19d0
3fffffa0: 3fffff10 aa55aa55 00000039 40104a54
<<<stack<<<
ets Jan 8 2013,rst cause:2, boot mode3,6)
load 0x4010f000, len 1384, room 16
tail 8
chksum 0x2d
csum 0x2d

Please what can I do?
Everytime only 16 cycles of FOR-NEXT is processed and then I get this error.
Thank you
p4ppc

emexes · Oct 6, 2019

Because you are dealing more with bytes one-by-one than with strings, you might need be making single-byte arrays like:

B4X:

Queue.AddBytesToLast(Array As Byte(64 + 8))     'H'
Queue.AddBytesToLast(Array As Byte(96 + 1))     'a'
Queue.AddBytesToLast(Array As Byte(96 + 12))    'l'
Queue.AddBytesToLast(Array As Byte(96 + 12))    'l'
Queue.AddBytesToLast(Array As Byte(96 + 15))    'o'
Queue.AddBytesToLast(Array As Byte(33))         '!'

Dim bc As ByteConverter
Dim JoinedString As String = bc.StringFromBytes(Queue.FirstItem())    'might not need the ()

petr4ppc · Oct 6, 2019

EMEXES,

thank you for your tip...
I am learning...And I think, that

B4X:

RemoveFirst

helps to secure only small memory consumption...(i dont know it for certain)

But if I have true (if I understand Erels Idea), then I think, that solution can be
0) receive serial data (for example "Hallo1234xouer1258"
1) use Queue mechanism for reading each received byte - byte by byte (because of small memory)
2) collect some of this bytes to new BYTE array, for example "Hallo"
3) then convert this byte array to string "Hallo"
4) send this string via standard serial back, for example "Hallo"

Best regards
p4ppc

emexes · Oct 7, 2019

petr4ppc said:
I am learning...

Warms my heart

B4X:
And I think, that

B4X:

RemoveFirst

helps to secure only small memory consumption...

What it does is remove the item (in your case, the byte) that is to next come off/out the queue. One byte, not the whole string (unless you've converted to using .AddBytesToLast). You would only call .RemoveFirst after you have processed .FirstItem().

that solution can be

B4X:

'0) receive serial data (for example "Hallo1234xouer1258"
Queue.AddBytesToLast("Hallo")
Queue.AddBytesToLast("123")
Queue.AddBytesToLast("4xouer12")
Queue.AddBytesToLast("58")

'... OR SOMETHING LIKE THIS ...

'1) use Queue mechanism for reading each received byte - byte by byte (because of small memory)
'2) collect some of this bytes to new BYTE array, for example "Hallo"
Do While SerialByteReady()
    Dim ReceivedByte As Byte = SerialGetNextByte()
    If ReceivedByte = 0x0A or ReceivedByte = 0x0D Then    'if end-of-line / end-of-packet marker
        HandlePacket( Queue.FirstItem() )    'might not need ()
        Queue.RemoveFirst    'clear packet buffer ready for next packet
    Else
        Queue.AddBytesToLast(Array As Byte(ReceivedByte))    'add received byte to packet buffer
    End If
Loop

'3) then convert this byte array to string "Hallo"
Dim WholeString as String = Queue.FirstItem()    'might not need ()
Dim PartialString As String = WholeString.Substring2(0, 5)    'returns only first 5 characters eg "Hallo"
Queue.RemoveFirst    'clears queue (which only contains one item) in preparation for receiving next string

'4) send this string via standard serial back, for example "Hallo"
Serial.PutString( PartialString )    'or whatever your serial library transmit routine is called

Again, I can't easily test this here, but... hopefully the gist of it is enough to get you closer to the finish line

emexes · Oct 7, 2019

ps, re:

petr4ppc said:
0) receive serial data (for example "Hallo1234xouer1258"

is good to see you're fully on-board with concept of zero-based indexing - might even crack a smile from Erel

Erel · Oct 7, 2019

Why do you need to 'join' anything? Call AStream.Write multiple times instead.

petr4ppc · Oct 7, 2019

Dear friends,

EMEXES - thank you very much for your help and advices
EREL - thank you very much for your help and advices

EMEXES:

is good to see you're fully on-board with concept of zero-based indexing

I am by Anywhere logicaly rebuilded after this weekend (I was alone) I spoke tommorow with my girl in BIT declaration - YES, NO. And I was surprised - She is happy - I think that she is happy because she know what I did at the weekend

Please

Log("Output:",Queue.FirstItem)

this write "hallo"
but here:

B4X:

Dim WholeString As String = byteconvert.StringFromBytes(Queue.FirstItem) 'FirstItem()    'might not need ()
Dim WholeString2 As String = Queue.FirstItem
        Log("WHOLE-",WholeString)
        Log("WHOLE2-",WholeString2)

I am doing some mistake I cant put Queue.FirstItem to string...

EREL - I will try to print serial byte to byte...thank you

EDIT
Excuse me - my mistake, I had Queue.REMOVEFIRST before code:

B4X:

Dim WholeString As String = byteconvert.StringFromBytes(Queue.FirstItem)

This functioned and I ger now string in:

B4X:

Log("WHOLE-",WholeString)

I go work with Emexes code and I will write result.
Thank you very much
Best regards
p4ppc

emexes · Oct 7, 2019

Erel said:
I am by Anywhere logicaly rebuilded after this weekend (I was alone) I spoke tommorow with my girl in BIT declaration - YES, NO. And I was surprised - She is happy - I think that she is happy because she know what I did at the weekend

I feel there is humour buried in there somewhere, but it has lost something in translation. Or perhaps gained something?!?!

I'll be back in ten minutes to process the rest of the post.

petr4ppc · Oct 7, 2019

EMEXES - yes I have tried humour. I only explained, that my girl recognized after she came back home (after 3 days) that - everything was OK, I was good at the weekend. And why?
Because after three days talking with my computer I can communicate with her only in BIT resolution = I can say to her only YES or NOT. And in this situation she like this resolution. Because she knows that I was not outside my flat - that I was not in some club or somethig else...I sit with my PC. I must explain - She is talking with me in very long STRING resolution.

What is interresting on this?

1-Interresting is that in situation, when she come back home after few days and my communication with her is in BIT resolution - then it is OK for her. (she recognize that I was not in the club)
0-But when she is home with me long time and I am starting talking with her in BIT resolution = only YES or NOT then it is for her NOT OK.

And result?
I must find the way how to convert her speak from strings to bit.

emexes · Oct 7, 2019

Erel said:
Why do you need to 'join' anything? Call AStream.Write multiple times instead.

petr4ppc said:
I go work with Emexes code

Petr (?)

I am with Erel, regarding that it is difficult to give good advice, without having actual real data to work with.

The packets that you are receiving via the serial port:

- are they ASCII or binary format
- fixed or variable length?
- delimited, or with a length specifier?
- any fixed known bytes at the beginning and/or end of the packet?
- checksum?

and ditto re: the packets you are transmitting via serial port.

and I will write result.

I am hanging out for this!

petr4ppc · Oct 7, 2019

Dear EMEXES

it is SOLVED

I absolutely agree with you and I understand. I think that you and Erel gives to me everything what I need for finding solution.
I am humble and grateful, I appreciate yours advices.

Here I am sending final solution which is perfect for me because of memory. This solution take only small fragment of memory (STACK=+-200) than JoinString (STACK=+-2000). (In my case)

B4X:

                For repeat=3 To Buffer.Length-1
                                             
                           Dim cbt(1) As Byte
                           byteconvert.ArrayCopy2(Buffer,repeat,cbt,0,1)
                           letter= byteconvert.StringFromBytes(cbt)
                                             
                           If letter=")" Then 'process
                                        Queue.AddBytesToLastItem(")")
                                        Dim thisisresult As String = byteconvert.StringFromBytes(Queue.FirstItem)
                                        Do While Queue.Size > 0
                                            Queue.RemoveFirst
                                        Loop

                            End If
                            If letter<>"(" And letter<>")" and letter...and letter...and letter....     Then Queue.AddBytesToLastItem(letter)                                             
Next

                 Log("WHOLE-",thisisresult)
                '  Now I can work with result and this FOR-NEXT cycle take minimal STACk memory *** its PERFECT!! This I need

Thank you very much,
BEST REGARDS
p4ppc

emexes · Oct 7, 2019

petr4ppc said:
it is SOLVED

that is EXCELLENT

B4R Question For-Next error after 16 cycle in JoinStrings

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