Webservice with QT

[BP]

Hi,

I am a new bee this technology. How to access the web service and parsing before UI rendering. UI control is based on the webservice result.

Any one help me. Thanks a lot.

[wysota]

It depends on the technology used for the webservice.

[squidge]

Assuming your web service uses the commonly available SOAP, you can use QtSoap

[wysota]

you can use QtSoap

I wouldn't be so sure about that. QtSoap is really broken

[enlightened_j]

You might want to check if the service can be accessed through http. If so, you can simply use QNetworkAccessManager to interact with the service.

[BP]

Hi,

Thanks enlightende_j.
I am using the QNetworkAccessManager for getting the webservice. And using QJson for parse the data.Those webservice are calling by after the UI rendering. But I want to call these webservice before the UI. How to Do this one?.

For examples, My screen have combobox. The combobox values are based on the webservice result. but , what happened here the webservice is called after the UI rendering so the combobox is empty. please help me... Thanks a lot

[TorAn]

BP :
I had a discussion about QNAM/SOAP usage with wysota some time ago. I recommend to search the forum for this thread, may be you will find the discussion useful. Solution that I came up with is:

Create a class that supports event processing.

class webserviceThread : public QThread.
{
...
private:
    boost::scoped_ptr<QNetworkAccessManager> _http;
}

class webserviceThread : public QThread.
{
...
private:
    boost::scoped_ptr<QNetworkAccessManager> _http;
}

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the main thing this class does is that it instantiates event processing.

void webserviceThread::run()
{
	exec();
}

void webserviceThread::run()
{
	exec();
}

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The way I am processing requests is that I am adding it to the queue declared in the webserviceThread and I am having timer firing every half-second to check the exitence of a new request.

webserviceThread::webserviceThread(const QString& host, int port) : QThread(),_timerid(-1), _http(new QNetworkAccessManager())
{
...
QObject::connect (_http.get(), SIGNAL (finished (QNetworkReply *)), this, SLOT(responseReceived(QNetworkReply*)));
...
_timerid = startTimer(_timerinterval);
}

webserviceThread::webserviceThread(const QString& host, int port) : QThread(),_timerid(-1), _http(new QNetworkAccessManager())
{
...
QObject::connect (_http.get(), SIGNAL (finished (QNetworkReply *)), this, SLOT(responseReceived(QNetworkReply*)));
...
_timerid = startTimer(_timerinterval);
}

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Now you can declare the instance of webserviceThread anywhere and use it for communicating with your web server. In my case I have this:

class datamanager : public QDialog
{
public:
    datamanager() {
        ...
        _dmcenter.start();
    }
 
private:
    webserviceThread _dmcenter;
}

class datamanager : public QDialog
{
public:
    datamanager() {
        ...
        _dmcenter.start();
    }
   
private:
    webserviceThread _dmcenter;
}

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Wysota recommended usage of main thread for event processing, but I found this to be easier in terms of encapsulation of all QNAM/webservice logic inside one class.

[jindoniit]

I tried to run example this. but it did not run.please help me

[squidge]

You need to help yourself first. What did not run? What happened? What did you expect? What is the problem?

[jindoniit]

sorry squidge, actually i did not read it carefully before ask question. now , i am using qtsoap to connect service. i did it well.