Unable to send files through bluetooth component

Ramesh_Babu_Govindul · May 24, 2020, 9:59pm

yes it will be an Android device.

Ramesh_Babu_Govindul · May 24, 2020, 10:08pm

Hi Juan,
we have methods to send text in bluetooth, I’m trying to convert image and document to text and then send it to other device.

@ChrisWard , @Juan_Antonio ,@TIMAI2 - This is the requirement that I got, to be implemented :

Develop a Bluetooth based document and image file transfer app like AirDrop.
Develop a Bluetooth base document file and image transfer app enabled with encryption.

TIMAI2 · May 24, 2020, 10:30pm

With the source and target devices being android, you should have everything you need?

Ramesh_Babu_Govindul · May 24, 2020, 10:34pm

AS we dont have methods to send files in bluetooth component ,I thought of converting the files using KIO4_File2String ,KIO4_Base641 but these components are returning “File not found” when I pass the Result.uri of activityStarter.

Juan_Antonio · May 24, 2020, 10:37pm

Both devices must have an app made with App Inventor and Bluetooth?

Ramesh_Babu_Govindul · May 24, 2020, 10:40pm

Its upto me how I develop it. They didn’t specify it, until I am able to send the file from one device to other.Whether I use one app or two apps its upto me.

TIMAI2 · May 24, 2020, 10:46pm

But did you try what I suggested: converting the content uri to a file path and ensuring the result was suitable for input to the base64 block ? (see above)

Ramesh_Babu_Govindul · May 24, 2020, 10:51pm

I tried doing it but not sure if I did it correct or not. I passed the Result.Uri for filename.

Juan_Antonio · May 24, 2020, 11:01pm

Try first convert a small image file (~ 2KB) in the assets to String.
FileToString
fileName = //myimage.png

GotString
string

Use this version:
http://kio4.com/appinventor/277_extension_imagen_string.htm

Ramesh_Babu_Govindul · May 24, 2020, 11:03pm

okay Juan. Ill try and get back to you.

Ramesh_Babu_Govindul · May 24, 2020, 11:22pm

Hi Juan, It worked if I did it with a file from assets.I was able to see the converted string of the jpg file.

TIMAI2 · May 24, 2020, 11:28pm

Firstly, sorry I pointed you at the wrong block! It should be this one:

component_method

Secondly, using GET_CONTENT does not return a good file path in the same way that using PICK does for images. You may need to build your own file picker using the File extension.

Juan_Antonio · May 24, 2020, 11:31pm

Send that String by Bluetooth to other device, then this device convert string to image file.

ChrisWard · May 25, 2020, 12:25am

For now, test code snippets as separate mini projects to prove feasibility.

After that, design the GUIs of Send and Receive Apps on paper, with a list of requirements. Do not try to reinvent the world!

If you decide that one of the Apps needs more than one screen, use Virtual Screens. Screen1 is the ‘real’ Screen and device-sized Vertical Arrangements on it are displayed/hidden as required - they are your Virtual screens.

Backup your work to your PC frequently

https://www.professorcad.co.uk/appinventortips#TipsGui GUI Layout
https://www.professorcad.co.uk/appinventortips#TipsImages Images
https://www.professorcad.co.uk/appinventortips#TipsApk Cannot Build/Install/Run APK
https://www.professorcad.co.uk/appinventortips#TipsBluetooth Bluetooth

You can raise a new Forum Topic if you get stuck with some detail or other, but it’s your homework and up to you to do the thinking now If you do raise a Topic, make sure it is well defined from the start!

Ramesh_Babu_Govindul · May 25, 2020, 2:24am

@ChrisWard @Juan_Antonio @TIMAI2 Thanks for your timely help. Ill look into it.

mpprog · October 30, 2022, 5:19pm

Hi Good evening I am interested in understanding how I can transfer binary files with this method to an iot card. Thanks in advance, if you can help me you would be doing me a huge favor.