Qt json parser return parse error

Question

I try to parse json string using this method:

QString ourJSONData = QString('{"couchdb":"Welcome","version":"1.0.1"}');
QString response = QString("[") + QString(ourJSONData) + QString("]");

QScriptEngine engine;
QScriptValue sc = engine.evaluate(response);

ui->label->setText(sc.toString());

But label return

SyntaxError: Parse error

I using Qt 4.7.4

What i do wrong? Thanks.

UPD:

Sorry, problem was in that string:

QString ourJSONData = QString('{"couchdb":"Welcome","version":"1.0.1"}');

need change to:

QString ourJSONData = QString("{\"couchdb\":\"Welcome\",\"version\":\"1.0.1\"}");

P.S. this method i found at http://blog.siegerstein.com/archives/134

You should use a real JSON parser to handle JSON instead of a JavaScript engine's eval function. — ThiefMaster
– ThiefMaster, Commented Oct 3, 2011 at 21:33

Clare Macrae · Accepted Answer · 2011-10-03 21:34:34Z

4

I built your code in QtCreator in got a very helpful error message:

character constant too long for its type

It's because your ourJSONData variable is initialised with a text in single quotes, which is for single characters.

This will correct that initialisation. (I put a \ before each double-quote, and then changed the single-quotes to double):

QString ourJSONData = QString("{\"couchdb\":\"Welcome\",\"version\":\"1.0.1\"}");

answered Oct 3, 2011 at 21:34

Clare Macrae

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