Waiting for readyread and requestfinished signal

[srohit24]

I am building a app that contacts the server for data, gets it and then does some processing before displaying the result.

I have created a mapping function that maps all the functions that need to be called if a particular request has to be successful.

This code is the main part where all the calling is done.


if (check_if_clientID_is_present())
call = "teci.create.client";
qDebug() << "call"<< call;

if(!call.isEmpty() && API_Request_Pointer == false)
mapping(call);


This is the mapping code where the required functions are called.
First i prepare the xml document, call the fetch function, then wait for the readyread and requestfinished signals, then call the parsing function and then exit the mapping function


void MainWindow::mapping(QString callname)
{
qDebug() <<"in mapping";
QThread thread;
if(call.compare("teci.create.client",callname)== 0)
{
qDebug() <<"inside create client";
API_Request_Pointer = true;
create_client();
fetch();
connect(&http, SIGNAL(readyRead(const QHttpResponseHeader &)),
this, SLOT(readData(const QHttpResponseHeader &)));

connect(&http, SIGNAL(requestFinished(int, bool)),
this, SLOT(finished(int, bool)));
parse_create_client();
API_Request_Pointer = false;
qDebug() <<"leaving create client";
}
else if (call.compare("teci.test.reverse",callname)== 0)
{
API_Request_Pointer = true;
reverse_string();
fetch();
connect(&http, SIGNAL(readyRead(const QHttpResponseHeader &)),
this, SLOT(readData(const QHttpResponseHeader &)));

connect(&http, SIGNAL(requestFinished(int, bool)),
this, SLOT(finished(int, bool)));
parse_reverse_string();
API_Request_Pointer = false;
}
qDebug() <<"leaving mapping";

}


void MainWindow::fetch()
{

xml.clear();

QByteArray string ("username");
string.append(":");
string.append("12345");
QString encoded = string.toBase64();
qDebug() <<"String"<< string <<"Encoded" <<encoded ;

QUrl url("http://..../");
url.setUserName("username");
url.setPassword("12345");

QHttpRequestHeader header("POST","/api/");
header.setValue("Host",url.host());
header.setValue("Path",url.path());
header.setValue("Authorization","Basic " + encoded);

http.setHost(url.host(),url.port(80));

connectionId = http.request(header,xmlrequest);
qDebug() << "Leaving fetch";
}


void MainWindow::create_client()
{
here i add tags and create the xml

xmlrequest.append(doc.toString());
qDebug() << xmlrequest.data();



void MainWindow::readData(const QHttpResponseHeader &resp)
{


if (resp.statusCode() != 200)
http.abort();
else
{
xml.addData(http.readAll());
}
qDebug() << "Leaving readdata";
}


void MainWindow::finished(int id, bool error)
{
qDebug() <<"Error" <<http.errorString();
if (error)
qWarning("Received error during HTTP fetch.");

qDebug() << "Leaving finished";
}


void MainWindow::parse_create_client()
{
qDebug() <<"Entering parser";
while (!xml.atEnd())
{
xml.readNext();
qDebug()<<xml.readNext();
if (xml.isStartElement())
{
currentTag = xml.name().toString();

if (currentTag == "client")
API_key += xml.attributes().value("key").toString();
qDebug() << "CurrentTag"<<currentTag;

}

else if (xml.isCharacters() && !xml.isWhitespace())
{

if (currentTag == "password")
API_password += xml.text().toString();
}
}

qDebug() << "webiste_clientID"<< API_key;
qDebug() << "webiste_serial no"<<API_password;

}
}


After reading the data, i write it down in a file.

This is the output i am getting.


Getting data from the webiste
call "teci.create.client"
in mapping
inside create client
<request version="0.1" >
<call name="teci.client.create" >
<client>
<kind>MOBILE</kind>
<name>API Test suite 7001</name>
</client>
</call>
</request>

Leaving fetch
Entering parser
1
webiste_clientID ""
webiste_serial no ""
leaving create client
leaving mapping
Leaving finished
Leaving readdata


the readyread and requestfinished signals are being called after the parsing function has been called.

How can i wait for the signal and then call the parsing function??

[wysota]

Either use waitForReadyRead() or call the parsing method from a slot connected to both signals you are waiting for where you will check if you received both of them or read this article Keeping the GUI Responsive.

[srohit24]

can u please gimme the code to wait for both the signals at the same time?

[wysota]

No, I can't. But you can read the article and write it yourself :)

Of course if you posted in the newbie section of the forum, I might have helped you a bit more but since you don't consider yourself a newbie, I'm sure your skills are enough to transform the code properly.

[nish]

can u please gimme the code to wait for both the signals at the same time?
rohit bhai.. this thing does not work anywhere.

[wysota]

can u please gimme the code to wait for both the signals at the same time?

Actually I can give you the code. But only if you give me your salary (or equivalent) for writing the application. I don't think that's worth it, is it?

[nish]

Actually I can give you the code. But only if you give me your salary (or equivalent) for writing the application. I don't think that's worth it, is it?
cool man cool down :). he got enough.

[srohit24]

i would have given u my salary but i am not working for anyone nor earning a salary.

i am just working in Qt to complete a project for this semester.

I have had a lot of help from this forum, so got a bit carried away :)

Anyway, any hints or clue to complete this particular task huh? ;)

[wysota]

i would have given u my salary but i am not working for anyone nor earning a salary.

i am just working in Qt to complete a project for this semester.
So maybe a salary for all the projects you will ever participate in thanks to the education you are going to receive?


I have had a lot of help from this forum, so got a bit carried away :)

Anyway, any hints or clue to complete this particular task huh? ;)

Please read the article I pointed you to. Then use QEventLoop or move your parsing code to another method which will be called when both signals are flagged as received.

[srohit24]

If u really wanted returns for your help, in cash, you wouldnt be helping others out, almost every day in this forum :)

I split the creating and parsing xml into two parts.

I am calling the creating b4 fetch and then parsing it in the readData fucntion


void RSSListing::readData(const QHttpResponseHeader &resp)
{


if (resp.statusCode() != 200)
http.abort();
else
{
xml.addData(http.readAll());
if(call.compare("teci.create.client",call)== 0)
{
qDebug() <<"inside parse create client";
parse_create_client();
API_Request_Pointer = false;

}
else if (call.compare("teci.test.reverse",call)== 0)
{
qDebug() << "Enter parse string reverse";
parse_reverse_string();
API_Request_Pointer = false;
}
}

[wysota]

If u really wanted returns for your help, in cash, you wouldnt be helping others out, almost every day in this forum :)
Damn... you got me figured out... :crying: