Cascades Development

[xtravanta]

Hi,

iam trying to load a json file that ive downloaded. (download works, checked if file exists in my "data/blabla.json")

But now when i'm trying to use JsonDataAccess it returns the following error while building

expected ';' before 'jda' OR 'JsonDataAccess' was not declared in this scope

the only thing i did:

#include <bb/data/JsonDataAccess.hpp>
/* ... */
void app::parseJson(){
    if (json->exists()) {
	JsonDataAccess jda;
    }
}

 Does anybody have a idea?

Thx

// EDIT

after adding

using namespace bb::data;

it worked!

[simon_hain]

i just wanted to add that you have to use the namespace, but you solved it yourself, even better

[xtravanta]

yeah but what i think is strange is that i tried to do it like this bb:data:JsonDataAccess but this didn't work..

a well it is working now

[kylefowler]

probably because it would have to be bb::data::JsonDataAccess not bb:data:JsonDataAccess

I swear, the number of questions posted on these forums that are solved by namespace issues goes up every day

[xtravanta]

o lol  yeah i know made a mistake in the quickreply.

[mohdfarhanakram]

Hi Friend,

can you please post your source code ?

Because i want to take idea how you download json and write the file , please help me

[xtravanta · Accepted solution]

Sure,

In your header file register the slots and the vars

private slots:
   void requestFinished(QNetworkReply *reply);

private:
   QNetworkAccessManager *mNetworkAccessManager;
   QFile *file;

for example (pseudo code)

// App.h

#ifndef APP_H_
#define APP_H_

//* includes & namespaces here *//

class App{
public:
	App();

	Q_INVOKABLE void init();

private slots:
	void requestFinished(QNetworkReply *reply);

private:
	QNetworkAccessManager *mNetworkAccessManager;
	QFile *json;
};

#endif /* APP_H_ */

Then in your constructor create the network access manager like this

mNetworkAccessManager = new QNetworkAccessManager(this);

 then add  the signal and slots and make sure to check them after that

bool result = connect(mNetworkAccessManager, SIGNAL(finished(QNetworkReply*)), this, SLOT(requestFinished(QNetworkReply*)));

Q_ASSERT(result);
Q_UNUSED(result);

 what i did was create the file refference here

json = new QFile("data/file.json");

 then call the init method to start the request, i think the Q_INVOKABLE is only needed when you call the init method from QML

init();

// init method looks like this
void App::init(){
QNetworkRequest request = QNetworkRequest();
    request.setUrl(QUrl("url to json"));
    mNetworkAccessManager->get(request);
}

and finaly in the SLOT we used requestFinished(QNetworkReply *reply) so this is how this method looks like

void App::requestFinished(QNetworkReply *reply){
	qDebug("Request finished");
	qDebug() << reply->error();
	qDebug() << reply->errorString();
	if (reply->error() == QNetworkReply::NoError) {
		qDebug() << "No error";

		QByteArray data = reply->readAll();

		if (!json->open(QIODevice::ReadWrite)) {
			qDebug() << "Failed to open file";
			return;
		}

		json->write(data);
		json->flush();
		json->close();

		qDebug() << "JSON file fetched and saved to 'data/file.json'";
}

Hope this helps.

Greets,

Xtravanta

[mohdfarhanakram]

Thanks Xtravanta

[xtravanta]

no problem