Encode/DeCode Image to base64 in RhoMobile Apps

Encoding Image to base64 string
Rhodes comes with base64 library which helps to convert image to base64 string.
Lets see how.
Lets take an image from camera using RhoMobile library
[source language=”ruby”]
require ‘base64′
def take_photo
Camera::take_picture(“/app/Item/take_photo_callback”,{:format=>’JPG’})
end
[/source]
Now process the image taken via Smartphone camera to convert to base64
[source language=”ruby”]
def take_photo_callback
if @params[“status”]==”ok”
image_uri = @params[‘image_uri’]
base64_string = get_base64_image(image_uri)
#optionally write it to sd card or even send to server via restful service.
write_to_sdcard(base64_string)
end
end
[/source]
Now convert the Blob image into base64 format
[source language=”ruby”]
#method to encode image to base64 string
def get_base64_image(damaged_photo_record)
image_base64 = Base64.encode64(open(Rho::RhoApplication::get_blob_path(image_uri.strip)) { |io| io.read })
#replace new line and carriage return chars
filter_image = image_base64.gsub(/\r/,””).gsub(/\n/,””)
end
[/source]
Decoding base64 string to image and write it to SD card. For iPhone apps, you can display it directly on the view page
[source language=”ruby”]
def write_to_sdcard(base64_image)
File.open(“/sdcard/photo.jpg”, “wb”) do |file|
file.write(Base64.decode64(base64_image))
end
end
[/source]