How to pass data from mainwindow to themewidget?

[SGaist]

Hi,

If the parsing failed then it's likely that your data incomplete. Did you ensure that you receive all your dataset ?

Since you mention QTcpSocket, how are you requesting the data ? How are you receiving it ? Are you checking that everything has arrived ?

[DemonLord]

@SGaist hi yes the tcp client sends the data set over to the TCP server and receives it successfully as it is displayed on the TCP console but im not sure why its not showing on themewidget iu even when the plaintext edit widget to display the data

[jsulm]

@DemonLord said in How to pass data from mainwindow to themewidget?:

but im not sure why its not showing on themewidget iu even when the plaintext edit widget to display the data

I already suggested why.
Did you do anything to verify what is happening?
Did you check what is inside data before you try to parse it?
Did you add any error handling code to your parsing code?
Did you check what parseError contains after QJsonDocument::fromJson(data,&parseError)?

[DemonLord]

@jsulm the problem is i dont understand the codes on parsing data to do any checking.....i only checked the connect function if is implemented correctly or not

[jsulm]

@DemonLord It is really not that hard to check what parseError contains.
It is also not hard to print out data to console to see what is inside.
How else should anybody know why it does not work if you do not even try to do simple debugging?

[DemonLord]

@jsulm Hey would you mind explaining these codes to me as i cant find anything online and I don't understand it as well never seen anything like this before. Thank you for your help.

QJsonParseError parseError;
QJsonDocument jsonResponse = QJsonDocument::fromJson(data,&parseError);

if(parseError.error != QJsonParseError::NoError) // if have error
{
qDebug()<< "Parse Error" <<parseError.errorString();// message
return; // then stop the process
}
QJsonArray jsonArray =jsonResponse.array();

if(!jsonArray.isEmpty())
{
QJsonObject jsonObject = jsonArray.first().toObject();

QVector <double> x,y;

for(int i=0;i< jsonObject.value("X").toArray().size();i++)
{
    x.push_back(jsonObject.value("X").toArray()[i].toDouble());
    y.push_back(jsonObject.value("Y").toArray()[i].toDouble());

}

[Pl45m4]

@DemonLord said in How to pass data from mainwindow to themewidget?:

i cant find anything online and I don't understand it as well never seen anything like this before

Does it work for you? What exactly you dont understand? The code is not that complicated.
How does your JSON look like? There are a lot JSON Qt tutorials out there... but how should we know how your JSON data you want to parse looks like?

[DemonLord]

@Pl45m4 Hi no it doesnt. This code i found it from youtube but the example shown also did not work. I am confused.....

QJsonDocument jsonResponse = QJsonDocument::fromJson(data,&parseError);
What does this mean? Does it mean that the data is already in QJsonDocument? I don't think i stored my data in the QJsonDocument yet? I am not sure because my data is received from the TCP sever then passed to the themewidget and then has to go to the JsonDocument right?

[Pl45m4]

@DemonLord said in How to pass data from mainwindow to themewidget?:

What does this mean? Does it mean that the data is already in QJsonDocument?

At least it tries to create a QJsonDocument from data while parseError is used for any potential error.
If you got no error it was most likely successful. If you got the code from a YT tutorial, make sure that your data has the same JSON structure, otherwise it cant work.

• https://doc.qt.io/qt-5/qjsondocument.html#fromJson

[jsulm]

@DemonLord said in How to pass data from mainwindow to themewidget?:

What does this mean?

Please read documentation and learn C++.
https://doc.qt.io/qt-5/qjsondocument.html#fromJson
QJsonDocument::fromJson is a static method which converts its input to QJsonDocument.

And you still refuse to tell us what is inside data - is it so hard to provide such simple information?

[DemonLord]

@jsulm @Pl45m4

The data contains decimal numbers. Im not sure if this is what your asking
This is the data:
"Rounds: 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[jsulm]

@DemonLord This is not JSON, no wonder parsing fails...

[DemonLord]

@jsulm Is there another method you could recommend me for parsing this kind of data? Im not sure if it needs parsing because i tried without parsig as well and no numbers were displaying

[jsulm]

@DemonLord Of course you have to parse it!
Use https://doc.qt.io/qt-5/qstring.html#split-5 to split (sep parameter would be '|' in your case).

[DemonLord]

@jsulm following the example

void ThemeWidget::putData(const QByteArray &data)
{

qDebug()<< "Got Data:" << data;
 QString str;
 QStringList list;

 str=data;
 list =str.split(QRegularExpression("|"));

 m_ui->plainTextEdit->insertPlainText(str);

// QString str;
// QStringList list;

// str = "Some text\n\twith strange whitespace.";
// list = str.split(QRegExp("\s+"));

}

It still doesnt show up im not sure if i wrote it correctly

[jsulm]

@DemonLord Please at least try to do some debugging by yourself.
What does str contains after you assign data to it?

str=data;
qDebug()  << str;

[DemonLord]

@jsulm sorry i cant use qdebug cause the data is displaying at the application output which prevents me for being able to see the qdebug message

[jsulm]

@DemonLord said in How to pass data from mainwindow to themewidget?:

sorry i cant use qdebug cause the data is displaying at the application output which prevents me for being able to see the qdebug message

Don't know what this means.
You can also use std::cout, you can use debugger, you can write into a file...

[DemonLord]

@jsulm Hi i managed to see the data when i did the debugging.....but im not sure why its not displaying on the plain text edit widget?