C Device Service - Retrieve Query String From GET Request

[vijay-hcl-epl]

Hi Team,
I am developing a custom C device-service in which I need to receive Query string from the GET request in the get_handler. As per the C servicewritersguide , in get_handler, iot_data_t *options can be used to get the query string from the GET request URL.

Queries

1. Is there any reference code available which gets the query string from the options parameter in get_handler?
2. I have used iot_data_to_json API to convert option to json. Now I have the query string as json key-value pair. Is there any in-built json API available in device-sdk-c/EdgeX which I can use to retrieve the value from the key-value pair? If it is not available I am planning to use external libraries such as json-c or jansson C library.

Please give your comments.

Thank you,
Vijay

[iain-anderson]

Hi Vijay, I don't know of anyone who has used this yet. However, options is a string map; you can use iot_data_string_map_get_string(options, "MY_KEY") to retrieve a value

[vijay-hcl-epl]

Thank you @iain-anderson for the information. It helps..!!