Android Tutorial .Net FileTransfer - Implement AsyncStreams Prefix mode

The attached C# project, implements the new stream protocol of AsyncStreams.
Relevant tutorials:
AsyncStreams Tutorial
FileTransfer - Send and receive files with AsyncStreams

This project allows you to connect the desktop to the FileTransfer app:

SS-2013-07-04_10.34.17.png


SS-2013-06-24_13.24.55.png


Note that the desktop doesn't open a server. So it can only connect to the device.

The SharpZipLib library, which is included in the zip file, is required for the checksum calculation.

There is a single change that needs to be done in device FileTransfer app:
AsyncStreams should use little endian instead of big endian. This is done by setting the second parameter of astream.InitializePrefix to False (Sub StartAStream).

The C# source code and executable are attached.
 

Attachments

  • FileTransfer-Desktop.zip
    81.2 KB · Views: 4,479

Gnappo jr

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FileTransfer the Desktop app: It is very interesting, you might have an update so that it functions also as a SERVER? I think this is very useful for many people.
thanks
 

ComposerB4A

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Hi, one question please, ¿this example works for Wifi and/or "Internet Móvil"? ¿The IP in "Internet Móvil" is Variable/Changing?
 

Erel

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pauleffect

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For anyone interested:
File -> New -> Project from existing code, select the folder where you saved these files, done.

If you dont have project from existing code (as was in my case) read this.
PS: don't forget to PROJECT -> Add reference : browse for ICsharp(...).zip.dll

@Erel Thank you! If you ever find yourself in Romania, beers on me!
I apologize for not thinking about it. I mean... it's lame. I've deleted my pointless post here! keep this one though!
 
Last edited:

Yafuhenk

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Hi thanks for the .NET code. My goal is to send sqlite database to my Android device.
However I am facing a problem. A soon as I send a file, my Android device disconnects.
Could it be that this program only works with the latest B4A version?
This is what I am using
B4A version 3.0
B4A Library versions: Network 1.25, RandomAccessFile 2.00
B4A Demo program File Transfer
PC the attached FileTransfer.exe
Thanks for any suggestion

Henk
 

Attachments

  • 2015-02-04 10_34_29-FileTransfer-Desktop.jpg
    2015-02-04 10_34_29-FileTransfer-Desktop.jpg
    36.2 KB · Views: 877

Yafuhenk

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Hi Erel,

Thanks for your reply.
Yes there is an error message on the Android side.
Error: (RuntimeException) java.lang.RuntimeException: Message size too large. Prefix mode can only work if both sides of the connection follow the 'prefix' protocol.
See also the log file below.

B4X:
** Activity (main) Resume **
StartAStream
Error: (RuntimeException) java.lang.RuntimeException: Message size too large. Prefix mode can only work if both sides of the connection follow the 'prefix' protocol.
** Activity (main) Pause, UserClosed = false **
 

Yafuhenk

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Hi Erel. I did not change the pc app in anyway. There is an exe file attached which I used.

The example you are referring too I already tested and it works fine. The desktop app is however is written in B4J when I remember correctly. I have to implement the feature in a vb.net application. That is the reason that i was so happy finding this c# .net version. Coverting it to vb.net was easy. But as i said i didn't test this vb.net version i tested the already existing and to the forum attached exe file
 

Yafuhenk

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Hi Erel,

That did it! Thanks!


For anyone who is interested in the vb.net FileTransfer solution here it is.
Regarding the Android side don't make the same mistake as I did.
As Erel pointed out: read the first post.

B4X:
There is a single change that needs to be done in device FileTransfer app:
AsyncStreams should use little endian instead of big endian. This is done by setting the second parameter of astream.InitializePrefix to False (Sub StartAStream).
 

Attachments

  • vbFileTransfer.zip
    172.5 KB · Views: 1,353

code4fun

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Could the server code be in python running on a linux machine? Has anyone tried converting the code to the python equivalent?
 
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