HOWTO: Save image files in TinyDB. Extension Base64.

[Juan Antonio]

(edited)

Hello friends, 

this post is an update of: https://groups.google.com/forum/#!msg/mitappinventortest/TAkRiwgY1yI/wQBnn6E0CwAJ

- It is an extension to convert files <--> String Base 64.

- Extension: com.KIO4_Base64.aix

- In this example: we can Save images, sounds files,... in the TinyDB.

- Using the block: FileToString, we can convert files to String Base64.

- We Store that String in the TinyDB with a tag. Different tag for different file.

- We can Get that String from the TinyDB, decode it and save it in an auxiliary file in the SdCard: /mnt/sdcard/aux_file

- Note that it is not necessary set extension file aux_file. This file is common to any conversion.

 - We can set this auxiliary file in an Image.Picture or in a Player.Source using the address: file:///mnt/sdcard/aux_file

 

- If file is in asset: fileName: //myphoto.jpg

- If file is in sdcard: fileName: /myphoto.jpg

 

 We cann't upload extensions.aix files to this forum, so I link to:

 

 http://kio4.com/appinventor/277i_extension_imagen_string.htm

 

 - Also through this extension we can copy the asset files in the SdCard.

 

 Regards.

 

 Juan Antonio Villalpando.

[TimAI2]

Great work Juan !

Will this convert ANY file to base64 or just image and audio files ?

Is you base64 conversion compatible with Google Drive ?

[BodyMindPower]

Hi Juan, great!

There is no need to ask for READ_EXTERNAL_STORAGE permission, because WRITE_EXTERNAL_STORAGE implicitly grants READ permission.

https://developer.android.com/reference/android/Manifest.permission

Anke

[Juan Antonio]

Thanks Anke, that's right.

[Juan Antonio]

Experience with large files in TinyBD.

- In our mobile we create the folder: /mnt/sdcard/fotos_grandes

- And in it we load large .jpg files, for example these: 

- When click in btn_StoreValue, all files will be saved in the TinyDB as String. 

- By continuously pressing btn_GetValue, the images stored in the TinyDB in the image component will be displayed. 

- Source .aia: 

http://kio4.com/appinventor/277i_extension_imagen_string.htm

- About size TinyDB: https://groups.google.com/forum/#!msg/mitappinventortest/AX1gPrAcuvY/2PWHn_NxrrsJ

[ABG]

(added to TinyDB section of FAQ)

https://sites.google.com/view/ai2-faq-view/home

ABG

[Juan Antonio]

- Thanks Abraham.

- Download a large image file (5 MB) from Internet and Store in TinyDB.

1.- Create directory /auxiliary (in /mnt/sdcard/auxiliary)

2.- Download a large image file (5 MB) from Internet with Web component in auxiliary/mydowloadfile.jpg.

3.- With block FileToString, convert this File To String.

4.- Store this String in TinyDB with tag: my_string

----- Now recover -----------

5.- Get String from TinyDB with tag: my_string

and convert this String To File with block StringToFile and save in /auxiliary/mynewfile.jpg

6.- Show in Picture file:///mnt/sdcard/auxiliary/mynewfile.jpg

7.- Delete directory /auxiliary.

- Image to download: https://sample-videos.com/img/Sample-jpg-image-5mb.jpg

Site to download samples images:

https://sample-videos.com/download-sample-jpg-image.php

Site to download samples videos:

https://sample-videos.com/

You can download file .aia from: http://kio4.com/appinventor/277i_extension_imagen_string.htm#3

Regards.

http://kio4.com/appinventor/277_extension_imagen_string.htm