Need help with Struct tm passing!

[JammyGeeza]

Hi there,

I'm trying to pass a Struct tm as a variable in a function to another class, to get it to print the time.

This is my current code for each of the functions:

void Game::Run()
{
	initialise();
	time_t rawtime;
	struct tm * timeinfo;
	time(&rawtime);
	timeinfo = localtime(&rawtime);
	//cout << "Updated at: " << asctime(timeinfo) << endl;
	components[0]->Update(timeinfo);
	terminate();
}

And the function in the other class I am passing it to:

void GameComponent::Update(const tm* eventTime)
{
	cout << "ID: " << id << "/tUpdated at: " << asctime(eventTime) << endl;
}

When I run this, it comes up with the "Break or Continue" error due to an unhandled exception, and an access violation.

However, when I run this code (in just the Game::Run function)

void Game::Run()
{
	initialise();
	time_t rawtime;
	struct tm * timeinfo;
	time(&rawtime);
	timeinfo = localtime(&rawtime);
	cout << "current time is: " << asctime(timeinfo) << endl;
	//components[0]->Update(timeinfo);
	terminate();
}

It prints the date and time perfectly fine. I thought it was as easy as just passing timeinfo as a parameter to the Update function, but it just doesn't like it.

Please can anyone tell me where I'm going wrong?

Thanks!

[Peter87]

Does components[0] exist and is it pointing to a valid object?

[JammyGeeza]

Yes, although I've just figured out the problem..

The error was actually because of the "id" variable in the GameComponent::Update function.
Which is NOW what I need help with!

The "id" variable here in the .cpp file for GameComponent class:

void GameComponent::Update(const tm* eventTime)
{
	cout << "ID: " << id << "/tUpdated at: " << asctime(eventTime) << endl;
}

Is apparently an unhandled exception and an access violation of the variable that has been put in the .h file for the same GameComponent class here:

#pragma once
#include <ctime>
#include <stdlib.h>
#include <iostream>

using namespace std;

class GameComponent
{
public:
	GameComponent();
	void Update(const tm* eventTime);
private:
	int id = 0;
	int instances = 0;
};

Any ideas why it would be throwing up an error? I tried also putting int id = 0; as public, but still no luck!

[JLBorges]

Add these two lines, and then try debugging it.

void GameComponent::Update(const tm* eventTime)
{
        std::cout << "this points to object at address: " << this << '\n' << std::flush; // *** added
        std::cout << "this->instances == " << this->instances << '\n' << std::flush; // *** added
	cout << "ID: " << id << "/tUpdated at: " << asctime(eventTime) << endl;
}

[JammyGeeza]

Thanks for the reply, however it didn't work! :( Just came up with the same error!

If it helps, here's the whole code for the .h and the .cpp file:

.h:

#pragma once
#include <ctime>
#include <stdlib.h>
#include <iostream>

using namespace std;

class GameComponent
{
private:
	int id;
	int instances;
public:
	GameComponent();
	void Update(const tm* eventTime);
};

.cpp:

#include "stdafx.h"
#include "GameComponent.h"


GameComponent::GameComponent()
{
}

void GameComponent::Update(const tm* eventTime)
{
	//std::cout << "this points to object at address: " << this << '\n' << std::flush;
	//std::cout << "this->instances == " << this->instances << '\n' << std::flush;
	cout << "ID: " << id << "Updated at: " << eventTime->tm_hour << ":" << eventTime->tm_min << ":" << eventTime->tm_sec << endl;
}

The error that I'm getting is:

Unhandled exception at 0x00CD6DAB in CourseW1.exe: 0xC0000005: Access violation reading location 0xCDCDCDD1.