erro code undeclared With timer

[arninio123]

Hello

I want to make a score board white a timer but i get a error message and i dont know what i can do about it
pls can someone help me??

Error Message
mainwindow.cpp:16: error: `btstart' undeclared (first use this function)
mainwindow.cpp:16: error: (Each undeclared identifier is reported only once for each function it appears in.)
mainwindow.cpp:17: error: `btstop' undeclared (first use this function)
mainwindow.cpp:18: error: `btreset' undeclared (first use this function)
mainwindow.cpp: At global scope:
mainwindow.cpp:21: error: `MaindWindow' has not been declared
mainwindow.cpp: In function `void count()':
mainwindow.cpp:22: error: `seconds' undeclared (first use this function)
mainwindow.cpp:24: error: `minute' undeclared (first use this function)
mainwindow.cpp:28: error: `lcdSeconds' undeclared (first use this function)
mainwindow.cpp:29: error: `lcdMinutes' undeclared (first use this function)
mainwindow.cpp:29: error: `minutes' undeclared (first use this function)

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <Qtime>
#include <Qtimer.h>
#include <QPalette>
 
 
MainWindow::MainWindow(QWidget *parent, Qt::WFlags f) :
	QMainWindow(parent, f),
	ui(new Ui::MainWindow)
{
	ui->setupUi(this);
	seconds = minutes = 0;
	timer = new QTimer(this);
	connect(timer, SIGNAL(timeout()), this, SLOT(count()));
	connect(btstart, SIGNAL(clicked()), this, SLOT(start()));
	connect(btstop, SIGNAL(clicked()), this, SLOT(stop()));
	connect(btreset, SIGNAL(clicked()), this, SLOT(reset()));
}
 
void MaindWindow::count(){
seconds++;
if(seconds==60) {
	minute++;
	seconds=0;
 
}
lcdSeconds->display(seconds);
lcdMinutes->display(minutes);
}
 
void MainWindow::start(){
	timer->start(1000);
}
 
void MainWindow::stop(){
	timer->start();
}
 
void MainWindow::reset(){
	seconds = minutes = 0;
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
void MainWindow::changeEvent(QEvent *e)
{
    QMainWindow::changeEvent(e);
    switch (e->type()) {
    case QEvent::LanguageChange:
      ui->retranslateUi(this);
        break;
        default:
        break;
    }
}
 
void MainWindow::on_lcdNumber_overflow()
{
 
}

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <Qtime>
#include <Qtimer.h>
#include <QPalette>


MainWindow::MainWindow(QWidget *parent, Qt::WFlags f) :
	QMainWindow(parent, f),
	ui(new Ui::MainWindow)
{
	ui->setupUi(this);
	seconds = minutes = 0;
	timer = new QTimer(this);
	connect(timer, SIGNAL(timeout()), this, SLOT(count()));
	connect(btstart, SIGNAL(clicked()), this, SLOT(start()));
	connect(btstop, SIGNAL(clicked()), this, SLOT(stop()));
	connect(btreset, SIGNAL(clicked()), this, SLOT(reset()));
}

void MaindWindow::count(){
seconds++;
if(seconds==60) {
	minute++;
	seconds=0;
	
}
lcdSeconds->display(seconds);
lcdMinutes->display(minutes);
}

void MainWindow::start(){
	timer->start(1000);
}

void MainWindow::stop(){
	timer->start();
}

void MainWindow::reset(){
	seconds = minutes = 0;
}

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

void MainWindow::changeEvent(QEvent *e)
{
    QMainWindow::changeEvent(e);
    switch (e->type()) {
    case QEvent::LanguageChange:
      ui->retranslateUi(this);
        break;
        default:
        break;
    }
}

void MainWindow::on_lcdNumber_overflow()
{

}

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mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
#include <QTimer>
#include "ui_mainwindow.h"
 
namespace Ui {
	class MainWindow;
}
 
class MainWindow : public QMainWindow {
	Q_OBJECT
public:
	QTimer * timer;
	int seconds;
	int minutes;
 
		MainWindow(QWidget *parent = 0, Qt::WFlags f = 0);
	~MainWindow();
 
protected:
   void changeEvent(QEvent *e);
 
private:
    Ui::MainWindow *ui;
 
private slots:
	void on_btstart_clicked();
	void count();
	void start();
	void stop();
	void reset();
void on_lcdNumber_overflow();
};
 
#endif // MAINWINDOW_H

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QTimer>
#include "ui_mainwindow.h"

namespace Ui {
	class MainWindow;
}

class MainWindow : public QMainWindow {
	Q_OBJECT
public:
	QTimer * timer;
	int seconds;
	int minutes;
	
		MainWindow(QWidget *parent = 0, Qt::WFlags f = 0);
	~MainWindow();

protected:
   void changeEvent(QEvent *e);

private:
    Ui::MainWindow *ui;

private slots:
	void on_btstart_clicked();
	void count();
	void start();
	void stop();
	void reset();
void on_lcdNumber_overflow();
};

#endif // MAINWINDOW_H

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[wysota]

So what is "btstart"? Shouldn't it be ui->btstart?

[Urthas]

void MainWindow::stop(){
	timer->start();
}

void MainWindow::stop(){
	timer->start();
}

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Note: start() stops and then restarts the timer. Did you mean to call stop() instead? Just checking.

[arninio123]

hi thank you

but i have 2 errors
and that is:
mainwindow.cpp:28: error: `lcdSeconds' undeclared (first use this function)
mainwindow.cpp:29: error: `lcdMinutes' undeclared (first use this function)

can you pls help how i can fix it :s

Thank you

[wysota]

Come on, ui->lcdSeconds and ui->lcdMinutes?

[arninio123]

Come on, ui->lcdSeconds and ui->lcdMinutes?

srry i am new to qdevelop and i don't really understand what you say :s

now i got this: but i got still the same error :s

#include "mainwindowimpl.h"
//
MainWindowImpl::MainWindowImpl( QWidget * parent, Qt::WFlags f) 
	: QMainWindow(parent, f)
{
	setupUi(this);
	seconds = minutes = 0;
	timer = new QTimer(this);
	connect(timer, SIGNAL(timeout()), this, SLOT(count()));
 
}
 
void MainWindowImpl::count(){
	seconds++;
	if(seconds == 60) {
		minutes++;
		seconds=0;
	}
		if(seconds == 100) {
		minutes=0;
	}
	lcdSeconds->display(seconds);
	lcdMinutes->display(minutes);
}
 
 
 
void MainWindowImpl::on_btStart_clicked()
{
	timer->start(1000);	
}
 
void MainWindowImpl::on_btStop_clicked()
{
	timer->stop();
}
 
void MainWindowImpl::on_btReset_clicked()
{
	seconds = minutes = 0;
}

#include "mainwindowimpl.h"
//
MainWindowImpl::MainWindowImpl( QWidget * parent, Qt::WFlags f) 
	: QMainWindow(parent, f)
{
	setupUi(this);
	seconds = minutes = 0;
	timer = new QTimer(this);
	connect(timer, SIGNAL(timeout()), this, SLOT(count()));
	
}

void MainWindowImpl::count(){
	seconds++;
	if(seconds == 60) {
		minutes++;
		seconds=0;
	}
		if(seconds == 100) {
		minutes=0;
	}
	lcdSeconds->display(seconds);
	lcdMinutes->display(minutes);
}



void MainWindowImpl::on_btStart_clicked()
{
	timer->start(1000);	
}

void MainWindowImpl::on_btStop_clicked()
{
	timer->stop();
}

void MainWindowImpl::on_btReset_clicked()
{
	seconds = minutes = 0;
}

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[wysota]

You are having problems with C++, not with Qt.

[arninio123]

You are having problems with C++, not with Qt.

How do you mean?

I really don't see what is wrong withe it :s

[wysota]

If you are having problems with the compiler then they are related to the language and not the framework you are using.

[ChrisW67]

How do you mean?

The error messages are related to variables you are attempting to use but are defined in the scope you are trying to use them. This comment:

Come on, ui->lcdSeconds and ui->lcdMinutes?

tells you how to fix this problem. It's exactly the same problem repeated from earlier in the thread and demonstrates that you have difficulty understanding how C++ variables are declared/used and the limits of their visibility. Note that this has nothing to do with Qt itself: just you, the C++ language and compiler.

Do you know what ui is? How do you access members of the ui object? What members are there?