Facing problem in creating new cpp and Header file

[anda_skoa]

but in cpp file i dont know what to include in constructor?

You added the labtext() declaration to the wrong header.
You need to add it to the class MainWindow or move the implementation from MainWindow to class Labeltext,

Cheers,
_

[parulkalra14]

Yeah actually i had created this labtxt function in mainwindow but now i want to create separate cpp and header file only for this particular function labtext. So i have created header file for labtxt but i dont know what to add in constuctor of labeltext in its cpp file.

[anda_skoa]

I don't see any need to do something in the constructor of class Labeltext, just pass the parent argument to the base class constructor.

Cheers,
_

[parulkalra14]

ok...then labeltext.h header file will include:
#ifndef LABELTEXT_H
#define LABELTEXT_H
#include <QLabel>
#include<mainwindow.h>



class QLabel;

class Labeltext : public QPlainTextEdit
{
Q_OBJECT

public:
Labeltext(QLabel *parent = 0);

protected:
void labtext();

private:

};

#endif // LABELTEXT_H


and labeltext.cpp will contain:
#include "labeltext.h"
#include<mainwindow.h>
#include<QLabel>

Labeltext::Labeltext(QLabel *parent) :QPlainTextEdit(parent)
{

}

void labtext()
{
if(cursor.block().text().contains("",Qt::CaseInsen sitive))
{
ui->label->setText("");

}

if(cursor.block().text().contains("printf",Qt::Cas eInsensitive)&& cursor.block().text().contains("(",Qt::CaseInsensi tive)||cursor.block().text().contains("cout",Qt::C aseInsensitive)&&cursor.block().text().contains("< <",Qt::CaseInsensitive))
{
ui->label->setText("Printing to Standard Output");
}
......//so on
}
then how to call in mainwindow.cpp?

[sulliwk06]

Well you'll have to create an instance of Labeltext in your main window, and then call the function from that. You'll have to include the labeltext header in mainwindow.

I don't mean to be rude, but are you sure you know enough about c++ to be making what appears to be and IDE/debugger for it?

[anda_skoa]

class Labeltext : public QPlainTextEdit

Are you sure your Labeltext class should be a QPlainTextEdit?

Labeltext(QLabel *parent = 0);

And you are sure you have a QLabel as its parent, not some container widget?

Cheers,
_

[parulkalra14]

Label is contain in Frame in my GUI so parent of labeltext should QFrame only..
So Labeltext(QLabel *parent = 0); is replaced with Labeltext(QFrame *parent = 0);

and Class Labeltext should inherit properties from Class Label.
So class Labeltext : public QPlainTextEdit is with class Labeltext : public QLabel

Am i correct now?

[anda_skoa]

Yes, that sounds a lot better

Cheers,
_

[parulkalra14]

So labeltext.cpp contain only one function void labtext(). So how to call this function from mainwindow.cpp?

#include "labeltext.h"
#include<QFrame>
#include<QLabel>
 
Labeltext::Labeltext(QFrame *parent) :QLabel(parent)
{
 
}
 
void labtext()
{
    if(cursor.block().text().contains("",Qt::CaseInsensitive))
   {
           ui->label->setText("");
 
   }
 
    if(cursor.block().text().contains("printf",Qt::CaseInsensitive)&& cursor.block().text().contains("(",Qt::CaseInsensitive)||cursor.block().text().contains("cout",Qt::CaseInsensitive)&&cursor.block().text().contains("<<",Qt::CaseInsensitive))
   {
           ui->label->setText("Printing to Standard Output");
   }
 
    else if(cursor.block().text().contains("while",Qt::CaseInsensitive)&& cursor.block().text().contains("(",Qt::CaseInsensitive))
   {
       ui->label->setText("Checking condition for While Statement");
 
   }
}

#include "labeltext.h"
#include<QFrame>
#include<QLabel>

Labeltext::Labeltext(QFrame *parent) :QLabel(parent)
{

}

void labtext()
{
    if(cursor.block().text().contains("",Qt::CaseInsensitive))
   {
           ui->label->setText("");

   }

    if(cursor.block().text().contains("printf",Qt::CaseInsensitive)&& cursor.block().text().contains("(",Qt::CaseInsensitive)||cursor.block().text().contains("cout",Qt::CaseInsensitive)&&cursor.block().text().contains("<<",Qt::CaseInsensitive))
   {
           ui->label->setText("Printing to Standard Output");
   }

    else if(cursor.block().text().contains("while",Qt::CaseInsensitive)&& cursor.block().text().contains("(",Qt::CaseInsensitive))
   {
       ui->label->setText("Checking condition for While Statement");

   }
}

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[anda_skoa]

So labeltext.cpp contain only one function void labtext(). So how to call this function from mainwindow.cpp?

I am not sure I understand the question, a method call is basic C++

pointerToLabelTextObject->labtext();

pointerToLabelTextObject->labtext();

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Cheers,
_

[parulkalra14]

Its not working showing Error undefined reference to Labeltext::labtext();
I declared class object in mainwindow.h like
Labeltext *labeltext;

and i called labtext() with the help of class Labeltext object i.e labeltext in this way :

labeltext->labtext()

[anda_skoa]

That is a linker error, so make sure that the code for labtext() is actually compiled. I.e. make sure that the respective source file is listed in SOURCES in your .pro file.

Cheers,
_

[d_stranz]

If this is what your .cpp file really looks like:

Labeltext::Labeltext(QFrame *parent) :QLabel(parent)
{
 
}
 
void labtext()
{
...
}

Labeltext::Labeltext(QFrame *parent) :QLabel(parent)
{

}

void labtext()
{
...
}

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then you have not implemented the function labtext() as a member of the class Labeltext. You have implemented it as a standalone function inside a cpp file. Your linker is complaining that it can't find Labeltext::labtext() because in fact you declared it in the header, but didn't implement it.

I think you need to learn how to walk in C++ before you attempt to write code in C++ + Qt.