Need Help: "Dialog does not name a type" Error

[hadifyassin]

Re: [SOLVED]Need Help: Error " 'CLASS' does not name a type"
First of all, I understand that this question has already been asked and I did understand the answer by @sierdzio but IDK how to fix it. What other way to open windows when button is pressed? And the site told me to create a new post.
I also know this looks long but that's only because I've made it as readable as I can.
I have a program in which a push button in a window opens a second window. The second window has a 'back' button which opens the first window.
But in the second window I'm getting the error.
NOTE: I'm only pasting part of the code so as to make it readable.
Dialog.h(first window)

#include <QDialog>
#include "calculator.h"
#include "imp.h"
#include "perc.h"

//standard codes that is automatically added on creating new dialog window in Qt

private slots:
void on_pushButton_clicked();

void on_pushButton_9_clicked();

void on_pushButton_8_clicked();

void on_pushButton_2_clicked();

void on_pushButton_3_clicked();

private:
Ui::Dialog *ui;
//all the windows that will open from this window
calculator *calc;
Imp *pa;
Perc *per;

imp.h(second window)

#include <QDialog>
#include "dialog.h"

//standard codes that is automatically added on creating new dialog window in Qt

private slots:
void on_pushButton_clicked();

void on_pushButton_2_clicked();

private:
Ui::Imp *ui;
Dialog *secdialog;

dialog.cpp(first window)
#include "dialog.h"
#include "ui_dialog.h"
#include "mainwindow.h"

//all the usual error-free(I think) code

void Dialog::on_pushButton_2_clicked()
{
hide();
pa=new Imp(this);
pa->show();
}

imp.cpp(second window)

#include "imp.h"
#include "ui_imp.h"
#include<QTextStream>
#include<QFile>
#include<QFileDialog>

//all the usual error-free(I think) code

void Imp::on_pushButton_2_clicked()
{
hide();
secdialog=new Dialog(this);
secdialog->show();
}

The error is in imp.h(2nd window) this line: Dialog *secdialog;
The error says "Dialog does not name a type".
Also note that dialog is not the main window but a window that opens many other windows when push button is pressed.

PLEASE HELP ME WITH THIS AND THANKS IN ADVANCE.

[mrjj]

Hi and welcome

The error says "Dialog does not name a type".

Which means its missing its .h file.
so in imp.ccp you must also have
#include "dialog.h"
So it know the custom type Dialog.

like this test project
https://www.dropbox.com/sh/cnvtmg831zvuex5/AADWKcdHF7K1qJKUE1a7atAMa?dl=0

[hadifyassin]

@mrjj THANKS A MILLION!!! REAL LIFESAVER!
BTW (small doubt): The error was in imp.h but I did include "dialog" in imp.h. The program worked when I removed those lines from the header and placed them in imp.cpp but I am confused as to why the previous configuration doesn't give the same result. Pls Clarify this as well.
Thanks again!

[mrjj]

Hi
:)

• The program worked when I removed those lines from the header and placed them in imp.cpp

That is a bid odd as it should have complained again.
Did you Clean All - Rebuild all to really check?

[hadifyassin]

Yes, I did. And it works! IDK what's supposed to happen but this really works.