April 2017
Intermediate to advanced
266 pages
7h 4m
English
Content preview from Building Blockchain Projects
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Parsing helpers
The result returned from an HTTP request can be HTML, JSON, XML, binary, and so on. In Solidity, it is difficult and expensive to parse the result. Due to this, Oraclize provides parsing helpers to let it handle the parsing on its servers, and you get only the part of the result that you need.
To ask Oraclize to parse the result, you need to wrap the URL with one of these parsing helpers:
- xml(..) and json(..) helpers let you ask Oraclize to only return part of the JSON or XML-parsed response; for example, take a look at the following:
- In order to get the whole response back, you use the URL data source with the api.kraken.com/0/public/Ticker?pair=ETHUSD URL argument
- If all you want is the last-price field, you need to use ...
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