QR Code & mobile devices & the desktop

[John Craig]

Hi, Nicolas.  I had thought the exact same thing - there's no need for 
additional hardware if you already have a capable phone / tablet.
I put a simple demo together - just paste the following code into a card 
and add a button that calls 'serverReset' and a field called 'Data' to 
show incoming data. I've used port 10310 for the connections and my 
local ip address is 192.168.0.100 - just replace with your own details.

On your scanner app, after scanning a code, you can just;
put URL("http://192.168.0.100:10310/?" & urlEncode("QR code data 
12345...")) into tResponse

You can also just use a browser to test quickly.  Don't you just love 
all this modern mobile technology?!  :D

John.



on serverReset
    # reset and listen on a custom port
    resetAll
    set the socketTimeoutInterval to 30
    accept connections on port 10310 with message "socketConnect"
    put the millisecs
end serverReset


on socketConnect pSocket
    # just read the first line of the request
   read from socket pSocket until CRLF with message "socketReceive"
end socketConnect


on socketReceive pSocket, pData
    # word 2 is the requested URL
    put word 2 of pData into tURL
    set itemDel to "?"
    if the num of items in tURL > 1 then
       # data received
       put urlDecode(item 2 of tURL) into tData
       put the long date && the long time & LF & \
             "Received: " &  tData & LF \
             into fld "Data"
       # process data, store in database, etc...
       # ..........
       # ..........
       # mirror the data back to signal success - you could send an md5 
hash, etc. instead
       put tData into tResponse
    else
       # no data received, response will be an error message
       put "Error: No data!" into tResponse
    end if
    # send the response and disconnect
    socketRespond pSocket, tResponse
    socketDisconnect pSocket
end socketReceive


on socketRespond pSocket, pData
    # send an HTTP response
   put "HTTP/1.1 200 OK" & CRLF into tHeaders
   put "Content-Type: " & tType & CRLF after tHeaders
   put "Cache-Control: no-cache" & CRLF after tHeaders
   put "Connection: Close" & CRLF after tHeaders
   put "Date: " & the internet date & CRLF after tHeaders
   put "Content-Length: " & length(pData) & CRLF after tHeaders
   put CRLF after tHeaders
   write tHeaders & pData to socket pSocket
end socketRespond


on socketDisconnect pSocket
   close socket pSocket
end socketDisconnect


on socketError pSocket
   socketDisconnect pSocket
end socketError


on socketTimeout pSocket
   socketDisconnect pSocket
end socketTimeout


on socketClosed pSocket
   socketDisconnect pSocket
end socketClosed



On 07/02/2012 10:56, Nicolas Cueto wrote:
> Hello All,
>
> Given the relatively high price of USB 2D code readers, those recent
> and tempting announcements about QR Code libraries aimed for LC users
> have got me wondering.
>
> What LC components (add-ons?) and LC commands ought I consider for
> somehow relaying (internet? WIFI?) to a desktop computer some QR Code
> scanned by a mobile device (iPhone or Android tablet)?
>
> A general idea about the steps involved would be great. And much appreaciated.
>
> Cheers.
>
> --
> Nicolas Cueto
>
> _______________________________________________
> use-livecode mailing list
> use-livecode at lists.runrev.com
> Please visit this url to subscribe, unsubscribe and manage your subscription preferences:
> http://lists.runrev.com/mailman/listinfo/use-livecode
>