KingswaySoft JSON Source Component: Paging REST requests in SSIS using HTTP header field

Question

I'm using the JSON Source Component to consume a REST service which returns page info and total records count on a particular field on the header response:

X-JSON: {"total":1952,"results":100,"limit":100,"skip":0}

Based on KingswaySoft documentation at How to Work with RESTful Endpoints in your SSIS ETL Process I understood I need to use the GetValueFromPreviousResponseHeaders function to extract the header variable and GetValueFromJson to extract the value from json

I tried it but I can't make GetValueFromPreviousResponseHeaders work.

The function: GetValueFromJson("{\"total\":1952,\"results\":100,\"limit\":100,\"skip\":0}","$.total") returns me 1952 so it's ok. If I substitute the JSON "{\"total\":1952,\"results\":100,\"limit\":100,\"skip\":0}" with the GetValueFromPreviousResponseHeader function, it doesn't work: GetValueFromJson(GetValueFromPreviousResponseHeaders("X-JSON"),"$.total")

Anyone know how it works?

Answer 1

I guys, fixed using (DT_I4) a the beginning:

(DT_I4)GetValueFromJson(GetValueFromPreviousResponseHeaders("X-JSON"),"$.total")