Switching between two forms with button click

[gfernandes]

Hi

I have successfully created multiple forms. I know how to switch from form 1 to form 2 on button click using SIGNALS and SLOTS. The problem is when I try switching from form 2 to form 1 it throws an error.

I have posted a part of the source code.
This is the first form called measure

measure.h

#ifndef MEASURE_H
#define MEASURE_H
 
#include <QWidget>
#include <readprocess.h>
 
 
namespace Ui {
class measure;
}
 
class measure : public QWidget
{
    Q_OBJECT
 
public:
    explicit measure(QWidget *parent = 0);
    ~measure();
 
private:
    ReadProcess *myProcess;
 
private slots:
    void showTime();
    void on_pushButton_clicked();
    void openReadProcess();
 
private:
    Ui::measure *ui;
 
};
 
#endif // MEASURE_H

#ifndef MEASURE_H
#define MEASURE_H

#include <QWidget>
#include <readprocess.h>


namespace Ui {
class measure;
}

class measure : public QWidget
{
    Q_OBJECT
    
public:
    explicit measure(QWidget *parent = 0);
    ~measure();

private:
    ReadProcess *myProcess;

private slots:
    void showTime();
    void on_pushButton_clicked();
    void openReadProcess();

private:
    Ui::measure *ui;

};

#endif // MEASURE_H

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measure.cpp

#include "measure.h"
#include "ui_measure.h"
#include <QTimer>
#include <QTime>
#include <QDate>
 
 
measure::measure(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::measure)
{
    ui->setupUi(this);
 
}
 
measure::~measure()
{
    delete ui;
}
 
void measure::showTime()
{
 // some code here
}
 
void measure::openReadProcess()
{
    myProcess = new ReadProcess();
    this->close();
    myProcess->show();
}
 
void measure::on_pushButton_clicked()
{
    openReadProcess();
}

#include "measure.h"
#include "ui_measure.h"
#include <QTimer>
#include <QTime>
#include <QDate>


measure::measure(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::measure)
{
    ui->setupUi(this);

}

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

void measure::showTime()
{
 // some code here
}

void measure::openReadProcess()
{
    myProcess = new ReadProcess();
    this->close();
    myProcess->show();
}

void measure::on_pushButton_clicked()
{
    openReadProcess();
}

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This is the second form called ReadProcess

#ifndef READPROCESS_H
#define READPROCESS_H
 
#include <QWidget>
#include <measure.h>
 
namespace Ui {
class ReadProcess;
}
 
class ReadProcess : public QWidget
{
    Q_OBJECT
 
public:
    explicit ReadProcess(QWidget *parent = 0);
    ~ReadProcess();
 
public slots:
    void openMeasure();
 
private:
    measure *myMeasureNew;
 
private slots:
    void TimingEvent();
    void on_abort_clicked();
    void updateValue();
 
private:
    Ui::ReadProcess *ui;
};
 
#endif // READPROCESS_H

#ifndef READPROCESS_H
#define READPROCESS_H

#include <QWidget>
#include <measure.h>

namespace Ui {
class ReadProcess;
}

class ReadProcess : public QWidget
{
    Q_OBJECT

public:
    explicit ReadProcess(QWidget *parent = 0);
    ~ReadProcess();

public slots:
    void openMeasure();

private:
    measure *myMeasureNew;

private slots:
    void TimingEvent();
    void on_abort_clicked();
    void updateValue();

private:
    Ui::ReadProcess *ui;
};

#endif // READPROCESS_H

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readprocess.cpp

#include "readprocess.h"
#include "ui_readprocess.h"
 
 
ReadProcess::ReadProcess(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::ReadProcess)
{
    ui->setupUi(this);
 
}
 
ReadProcess::~ReadProcess()
{
    delete ui;
}
 
void ReadProcess::updateValue()
{
    //some code here
}
 
void ReadProcess::TimingEvent()
{
    //some code here
}
 
void ReadProcess::openMeasure()
{
    myMeasureNew =new measure();
    this->close();
    myMeasureNew->show();
 
}
 
void ReadProcess::on_abort_clicked()
{
    openMeasure();
}

#include "readprocess.h"
#include "ui_readprocess.h"


ReadProcess::ReadProcess(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::ReadProcess)
{
    ui->setupUi(this);

}

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

void ReadProcess::updateValue()
{
    //some code here
}

void ReadProcess::TimingEvent()
{
    //some code here
}

void ReadProcess::openMeasure()
{
    myMeasureNew =new measure();
    this->close();
    myMeasureNew->show();

}

void ReadProcess::on_abort_clicked()
{
    openMeasure();
}

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When I run my application the error thrown is
'measure' does not name a type
this error is of readprocess.h following line
private:
measure *myMeasureNew;

Cannot figure out where I am going wrong. Kindly help

[Santosh Reddy]

In measure.h file, instead of including "readprocess.h" forward declare "class ReadProcess;"
and include "readprocess.h" in measure.cpp

[gfernandes]

Thank you Santosh Reddy Wow! That actually did the trick. But why was my way wrong? Just curiosity sake.. Just a beginner, so wanna learn more.

[Santosh Reddy]

Forward declaration