B4J Question Reading a file to list

stevel05

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• Jan 28, 2016

• #2

Have you seen this? https://www.b4x.com/android/forum/threads/jserial-library.34762/

 

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saunwin

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• Jan 28, 2016

• #3

Hi Steve, Yes I have comms between the PC and the micro, it's getting the list into a byte array suitable from transmission (I think) I'm struggling with.

 

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stevel05

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• Jan 28, 2016

• #4

Then you should probably use the jRandomAccessFile Library and it's Read as bytes Method.

 

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Erel

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• Jan 28, 2016

• #5

You can read a file to an array of bytes with:

B4X:

Dim bytes() As Byte = Bit.InputStreamToBytes(File.OpenInput(...)) 'InputStreamToBytes closes the stream

 

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saunwin

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• Jan 28, 2016

• #6

Hi Erel,
Thanks for the advice. I seem to be missing some bytes.
The code is below and the log will log b.length correctly as 36133
the loop will only log 603 values ?

Any idea what's happening here.
Many thanks in advance.

B4X:

Dim b() As Byte = Bit.InputStreamToBytes(File.OpenInput(File.GetFileParent(filename), File.GetName(filename)))
   Log (b.Length)
        For x =0 To b.Length
            Log (x &" - " & b(x))
    Next

 

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Erel

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• Jan 28, 2016

• #7

Don't you see an error with this code?

It should be b.Length - 1.

 

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DonManfred

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• Jan 28, 2016

• #8

Erel said:

Don't you see an error with this code?

It should be b.Length - 1.

Click to expand...

Then it ill be one byte less

But 36133 (b.length) - 603 (log output in lines) = 35530 missing bytes.

Or did i miss something? ;-)

 

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saunwin

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• Jan 28, 2016

• #9

Erel said:

Don't you see an error with this code?

It should be b.Length - 1.

Click to expand...

No Error's Erel, The sub just completes after 603 loops (it doesn't reach the end of the array, so wouldn't throw the error)

 

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Erel

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• Jan 29, 2016

• #10

Please upload a small project with this file and code.

 

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saunwin

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• Feb 1, 2016

• #11

Hi Erel,

I Think I've done this correctly.

 

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• test.zip

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Erel

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• Feb 1, 2016

• #12

It is an IDE issue. The logger becomes overflown and then dismisses the items. It will be fixed in v4.20 (non-beta).

The data is there. It will also show if you put a breakpoint in this sub.

 

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