converting list to JSON - performance issue.

Hi,

I want to pass the PortalSearchItems list to be passed from qml to Cpp. Eventhough, I can get the result, app got just killed, when this code executes. I assume performance issue.

Code Snippet: main.qml
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Code:

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var varidPortalSearchItemsCount = idPortalSearchItems.totalResults;
 
var vartextJson = "";
 
                for (var ii = 0; ii <= varidPortalSearchItemsCount -1 ;ii++)
                {
                    vartextJson += '{"title":"'+ idPortalSearchItems.results[ii].title +'"
                                    ,"owner":"'+ idPortalSearchItems.results[ii].owner +'"
                                    ,"url":"'+ idPortalSearchItems.results[ii].url +'"
                                    ,"itemId":"'+ idPortalSearchItems.results[ii].itemId +'"
                                    }' + ',';
                }
 
 
                vartextJson = vartextJson.substring(0, vartextJson.length-1) + ']';
                vartextJson = '[' + vartextJson;
                var varJsonString =JSON.parse(vartextJson);
                objHomeController.eveWriteXML(varJsonString);

---

HomeController.h
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Code:

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Q_INVOKABLE bool eveWriteXML(const QJsonObject &pqvarPortalItemResult);

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HomeController.cpp
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Code:

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bool HomeController::eveWriteXML(const QJsonObject &pqvarPortalItemResult)
{
 
    QVariantMap jsonQVariantMap = pqvarPortalItemResult.toVariantMap();
 
 
 
        for(QVariantMap::const_iterator iter = jsonQVariantMap.begin(); iter != jsonQVariantMap.end(); ++iter) {
 
        QVariant objQVariant = iter.key();
        QVariant objQVariant1 = iter.value();
 
        QString strTitleValue  =  objQVariant1.toMap().values("title").value(0).toString();
        QString strUrlValue    =  objQVariant1.toMap().values("url").value(0).toString();
        QString strOwnerValue  =  objQVariant1.toMap().values("owner").value(0).toString();
        QString strItemIdValue =  objQVariant1.toMap().values("itemId").value(0).toString();
 
}

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Thanks In advance.

A lot of processing in QML but your choice to do that.

One thing you could avoid in the C++ code it to convert objQVariant1 into a map several times.
And calling just value(key) instead of values(key).value(0)

Also "I assume performance issue" is a no-go. Never assume, always measure.

Cheers,
_

Hi,

for(QVariantMap::const_iterator iter = jsonQVariantMap.begin(); iter != jsonQVariantMap.end(); ++iter) {

QVariant objQVariant = iter.key();//Gives the value of Iteration - 0,1....

calling just value(key)

Some code snippet Please.

Quote:

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Originally Posted by Mathan

QVariant objQVariant = iter.key();//Gives the value of Iteration - 0,1....

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No, gives the key of the iteration.
Actually a QString.

Quote:

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Originally Posted by Mathan

calling just value(key)

Some code snippet Please.

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Really? You need a code snippet for a single method call on an object?

Code:

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map.value("title");

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Cheers,
_