One-second timer implementation using Open C++
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Contents |
Overview
This code snippet shows how to create a simple one-second timer class using Open C++. This implementation is based on the time() and difftime() functions which are declared in the time.h header file. The ExampleTimer class has methods to start, stop, and reset the timer. The timer class offers getter methods for time and state as well.
Note: In order to use this code, you need to install the Open C/C++ plug-in.
This snippet can be self-signed.
MMP file
The following libraries are required:
LIBRARY libstdcpp.lib
LIBRARY libc.lib
LIBRARY euser.lib
Header file
#ifndef EXAMPLETIMER_H_
#define EXAMPLETIMER_H_
// INCLUDES
#include <time.h>
// CLASS DECLARATION
class ExampleTimer
{
public:
ExampleTimer();
void Start();
void Stop();
void Reset(bool restart);
int GetTime();
bool IsRunning() { return m_isrunning; }
bool IsReset() { return m_isreset; }
private:
time_t m_starttime;
time_t m_stoptime;
bool m_isreset;
bool m_isrunning;
};
#endif // EXAMPLETIMER_H_
Source file
#include "ExampleTimer.h"
ExampleTimer::ExampleTimer(): m_starttime(0),
m_stoptime(0),
m_isreset(false),
m_isrunning(false)
{
}
void ExampleTimer::Start()
{
if(!m_isrunning)
{
if(m_isreset)
{
time(&m_starttime);
}
else
{
time_t now = time(&now);
time_t tmp = (time_t)difftime(m_stoptime, now);
m_starttime = (time_t)difftime(m_starttime, tmp);
}
m_isrunning = true;
m_isreset = false;
}
}
void ExampleTimer::Stop()
{
if(m_isrunning)
{
m_isrunning = false;
time(&m_stoptime);
}
}
void ExampleTimer::Reset(bool restart)
{
Stop();
m_isreset = true;
m_starttime = m_stoptime;
if(restart)
{
Start();
}
}
int ExampleTimer::GetTime()
{
if(m_isrunning)
{
time_t now = time(&now);
return (int)difftime(now, m_starttime);
}
else
{
return (int)difftime(m_stoptime, m_starttime);
}
}
Example class usage
A simple example application demonstrating the ExampleTimer class usage:
#include <stdio.h> //atoi()
#include <string> //string, getline()
#include <iostream> //cout, cin
#include "ExampleTimer.h"
using namespace std;
void ShowMenu()
{
cout << " 1 = Start/Stop Timer" << endl;
cout << " 2 = Reset Timer" << endl;
cout << " 3 = Reset Timer and Restart" << endl;
cout << " 4 = Show Timer State" << endl;
cout << " 5 = Show Timer Time" << endl;
cout << " 0 = Quit Test Program" << endl;
cout << endl;
cout << ">";
}
int main()
{
int choice = -1;
string selection;
bool exit = false;
ExampleTimer timer;
while(!exit)
{
ShowMenu();
getline(cin, selection);
// NOTE: atoi will convert also values e.g. "xyz" and "\n" to '0'
choice = atoi(selection.c_str());
switch(choice)
{
case 1: //Start/Stop
if(timer.IsRunning())
{
timer.Stop();
cout << "[timer stopped]" << endl;
}
else
{
timer.Start();
cout << "[timer started]" << endl;
}
break;
case 2: //Reset
timer.Reset(false);
cout << "[timer reset]" << endl;
break;
case 3: //Reset and Restart
timer.Reset(true);
cout << "[timer reset and restart]" << endl;
break;
case 4: //Show State
cout << "[timer state]" << endl;
cout << "Running:" << timer.IsRunning() << endl;
cout << "Reset:" << timer.IsReset() << endl;
break;
case 5: //Show Time
cout << "[timer time]:" << timer.GetTime() << " sec" << endl;
break;
case 0: //Quit
exit = true;
break;
default:
cout << "Please, enter only numeric values between 0 and 5!" << endl;
}
return 0;
}
Postconditions
The example application prompts the user to enter menu selections between 0 and 5. Based on the selections, the example timer is started, stopped, or asked to show the current state until 0 is entered and the program exits.
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