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1. INTRODUCTION
The Json class is a simple class for parsing JSON data into a QVariant
hierarchies. Now, we can also reverse the process and serialize
QVariant hierarchies into valid JSON data.
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2. HOW TO USE
The parser is really easy to use. Let's say we have the following
QString of JSON data:
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{
"encoding" : "UTF-8",
"plug-ins" : [
"python",
"c++",
"ruby"
],
"indent" : {
"length" : 3,
"use_space" : true
}
}
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We would first call the parse-method:
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//Say that we're using the QtJson namespace
using namespace QtJson;
bool ok;
//json is a QString containing the JSON data
QVariantMap result = Json::parse(json, ok).toMap();
if(!ok) {
qFatal("An error occurred during parsing");
exit(1);
}
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Assuming the parsing process completed without errors, we would then
go through the hierarchy:
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qDebug() << "encoding:" << result["encoding"].toString();
qDebug() << "plugins:";
foreach(QVariant plugin, result["plug-ins"].toList()) {
qDebug() << "\t-" << plugin.toString();
}
QVariantMap nestedMap = result["indent"].toMap();
qDebug() << "length:" << nestedMap["length"].toInt();
qDebug() << "use_space:" << nestedMap["use_space"].toBool();
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The previous code would print out the following:
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encoding: "UTF-8"
plugins:
- "python"
- "c++"
- "ruby"
length: 3
use_space: true
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To write JSON data from Qt object is as simple as parsing:
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QVariantMap map;
map["name"] = "Name";
map["age"] = 22;
QByteArray data = Json::serialize(map);
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The byte array 'data' contains valid JSON data:
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{
name: "Luis Gustavo",
age: 22,
}
------------------------------------------------------------------------
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4. CONTRIBUTING
The code is available to download at GitHub. Contribute if you dare!
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