B4J Question b4j server - how to send a value to server and get a result back

[moster67]

There are som many examples about b4j web-servers and I have difficulties in finding the correct sample.

If I create a Handle, for instance "/gen", how can I pass on to the server a value such 1+2 and make it send back to my app the answer i.e. 3

for instance, I send the following request: http://localhost:17178/gen?1+2
(not sure how I would create the string)
and back I would receive the answer i.e. 3 which I could parse from the response.

Basically I want the server to do an "operation" for me and then send back the result.

Many thanks.

 

[Erel]

There are two parts to your question. How to send a parameter to the server and how to evaluate the parameter.

The url for GET parameters should be:
/gen?expression=1%2B2
%2b = url encoded +
You can then use req.GetParmater("expression") to get the expression.

Evaluate it with B4X Eval.

Return the result with resp.Write.

 

[moster67]

Thanks! Works just the way I wanted. I guess this can also be used for creating APIs for clients.