Component: JSON Decoder (Comms: IoT/Cloud): Difference between revisions

Revision as of 17:05, 27 November 2023

Allows dynamic key and value pairs to be collected from a formatted JSON string.

Please click here to download the component source project: FC_Comp_Source_JSONDecoder.fcfx

Please click here to view the component source code (Beta): FC_Comp_Source_JSONDecoder.fcfx

No detailed description exists yet for this component

Example program showing how to use a JSON decoder component to parse a simple JSON encoded data string. JSON Decoder Example

Example program showing how to take data and encode it into a JSON string to be sent out over comms.

The example also hows how to decode a received JSON string and pull out values.

	FindName
Searches for a name in the JSON data. Returns the data index position. Returns -1 if the name was not found.
- STRING	Name

- UINT	SkipCount
Number of matches to skip before returning.
- INT	Return

	ParseJSON
Accepts a JSON formatted data string and stores locally in the data buffer ready for parsing. Returns the estimated number of name and data keys present.
- STRING	Data
JSON data string to parse
- UINT	Return

	ReadDataAsFloat
Reads the data of a specific element as a floating point value
- UINT	Element
Index of the element to read
- FLOAT	Return

	ReadDataAsNumber
Reads the data of a specific element as a numeric integer value
- UINT	Element
Index of the element to read
- LONG	Return

	ReadDataAsString
Reads the data of a specific element as a string value
- UINT	Element
Index of the element to read
- STRING	Return

	ReadName
Reads the name of a specific element
- UINT	Element
The Index of the element to read
- STRING	Return

	Properties
	Data Bytes
Number of bytes used to store the entire data for the JSON message. Includes names and data values so make sure this is large enough to store everything you want to be able to put into a single JSON data string.

@@ Line 26: / Line 26: @@
 ==Examples==
+===Simple Decode===
+Example program showing how to use a JSON decoder component to parse a simple JSON encoded data string.
+{{Fcfile|JSON_Decoder.fcfx|JSON Decoder Example}}
+===Simple Encode and Decode===
 Example program showing how to take data and encode it into a JSON string to be sent out over comms.
@@ Line 32: / Line 40: @@
 {{Fcfile|JSON_Demo.fcfx|JSON_Demo}}