Question

I have to generate QRCodes using concatenated object properties. These strings might be long, that’s why I’d like to know which compression algorithm to use knowing that my String’s length is between 25 an 100+ characters

thanks in advance,

Jerec

Answer 1

I am assuming that since you are going to use compression before you store the strings that these QR codes will not be readable by any client, it would have to be an application that you wrote (b/c you are storing character with an unknown encoding, the client won’t be able to decode).

Instead of compressing and storing the long string in the QR code, have your application create a URI (like a GUID or a URL) and when your application decodes that URI it looks up all the values (uncompressed) that you wanted to store in the QR code. Then your app can just look up the format in any way it wants.

For example, assuming your persistant storage is an xml file, but it could be anything:

<URI = "http://mydomain.com/790C9704-8C61-435F-991D-CDBB5767AA3D">
    <MyElement>14523</MyElement>
    <MyElement>67548</MyElement>
    ...
    <MyElement>46167</MyElement>
</URI>

Encoded on QR code: “http://mydomain.com/790C9704-8C61-435F-991D-CDBB5767AA3D”, values can then be looked up.