Accessing UI Widget data from .ccp file in .c file

[020394]

Then why don't you use that?

I am using that in my .cpp file.
I am getting the String from a LineEdit in my cpp file called mainwindow
I followed ur code by setting this

QByteArray data=ui->lineEdit->text().toUtf8();

QByteArray data=ui->lineEdit->text().toUtf8();

To copy to clipboard, switch view to plain text mode 

Now I want to pass the QByteArray data to the c file .
I am passing it to the c file to query it from the database using sqllite statment.

I tried calling the object from the cpp file to c file
Using

extern "C" QByteArray data;

extern "C" QByteArray data;

To copy to clipboard, switch view to plain text mode 

But i dont think i am able to retrieve the data from the cpp file

I am getting errors such as unknown type "namespace".
.