incomplete type is not allowed

[Aminmlp]

this my .h file:

#pragma once

#include <QtCore>
#include <QtWidgets>

using namespace Qt;

#include "ui_addressdialog.h"

namespace Ui
{
class AddressDialog
}

class AddressDialog : public QDialog
{
Q_OBJECT

private:
Ui::AddressDialog *ui = nullptr;
public:
explicit AddressDialog(QWidget *parent = nullptr);
~AddressDialog();
QString remoteName() const;
quint16 remotePort() const;

and this is .cpp file:

#include <QtCore>
#include <QtWidgets>
#include <QtNetwork>
#include <limits>

#include "stdafx.h"
#include "addressdialog.h"
#include "ui_addressdialog.h"

AddressDialog::AddressDialog(QWidget *parent)
: QDialog(parent), ui(new Ui:: AddressDialog) //error
{
ui->setupUi(this); //error
setupHostSelector();
setupPortSelector();
}

AddressDialog::~AddressDialog()
{
delete ui;
}

I use Qt in VS 2017. in ui(new Ui:: AddressDialog), I have the "incomplete type is not allowed". why?

[Christian Ehrlicher]

C++ basics - you have to (forward) declare a type before you can use it. So either include the generated ui file in your header or forward declare it there.

[Aminmlp]

I know this my friend. this is a example of Qt website

[jsulm]

@Aminmlp said in incomplete type is not allowed:

Qt website

Which one?

[Aminmlp]

this one.
https://doc.qt.io/qt-5/qtnetwork-secureudpclient-example.html

[jsulm]

@Aminmlp Compiles for me.
I guess you see it not when building instead it comes from code model?

[Aminmlp]

what do you mean?

[jsulm]

@Aminmlp When do you see this error?
Is it when you build the project?

[Aminmlp]

@jsulm yes you are right.

[J.Hilk]

@Aminmlp how do you build it ?