[英]Stack throws memory access violation
因此,我正在尝试创建一个简单的扑克游戏,以使自己重新熟悉C ++,因为我已经离开了一段时间,并且想重新使用C ++。
我在STL中遇到堆栈问题(适当的,不是吗?)。 我似乎无法获得允许我向堆栈中添加任何内容的功能。 每次我在堆栈对象上调用push函数时,都会引发内存访问冲突……我什至尝试创建一个整数堆栈,并将这些整数添加到堆栈中,但是仍然会引发内存访问冲突错误。 这很奇怪。
当前将对象添加到堆栈的代码是:
//shuffles the deck
void Deck::shuffle()
{
int index;
for(int i = 0; i < DECK_SIZE; i++)
{
index = (rand() % 52);
if(deck[index].drawn == false)
{
shuffledDeck.push(deck[index]); //throws the error
deck[index].drawn = true;
}
else
{
i--;
}
}
}
我设置了一个断点,然后将其跟踪到兔子洞中,发现它在此处引发了异常:
void push_back(const value_type& _Val)
{ // insert element at end
this->_Orphan_all();
_PUSH_BACK_BEGIN; //EXCEPTION!
this->_Getal().construct(
this->_Map[_Block] + _Newoff % _DEQUESIZ, _Val);
_PUSH_BACK_END;
}
哪个位于deque.cpp ...这很奇怪。
作为参考,以下是我认为可能需要的其余代码:
Deck.cpp
#include "stdafx.h"
#include "Deck.h"
#include <time.h>
using namespace std;
using namespace CardDeck;
const int DECK_SIZE = 52;
CARD deck[DECK_SIZE];
std::stack<CARD> shuffledDeck;
Deck::Deck()
{
srand((unsigned int)time(NULL));
loadCards();
}
Deck::~Deck()
{
}
//Draws a card from the deck
CARD Deck::drawCard()
{
CARD card = shuffledDeck.front();
shuffledDeck.pop();
return card;
}
//shuffles the deck
void Deck::shuffle()
{
int index;
for(int i = 0; i < DECK_SIZE; i++)
{
index = (rand() % 52);
if(deck[index].drawn == false)
{
shuffledDeck.push(deck[index]);
deck[index].drawn = true;
}
else
{
i--;
}
}
}
void Deck::loadCards()
{
//create input file stream
ifstream cardList;
//open the list of cards
cardList.open("card.txt", ios::in);
//if the file has opened successfully
if(cardList.is_open())
{
int index = 0;
//and while the cardlist has data left
while(cardList.good())
{
char * context = NULL;
CARD card = CARD();
//read the cards
string line;
getline(cardList, line);
char * s = strtok_s(&line[0], ", ", &context);
card.value = *s;
s = strtok_s(NULL, ", ", &context);
card.suit = s;
card.drawn = false;
deck[index] = card;
index++;
}
}
}
Deck.h(包含CARD结构)
#pragma once
#include <string>
#include <stack>
#include <fstream>
#include <sstream>
#include <iostream>
#include <string>
namespace CardDeck
{
struct CARD
{
public:
std::string suit;
char value;
bool drawn;
CARD(){}
CARD(const CARD& card)
{
suit = card.suit;
value = card.value;
drawn = card.drawn;
}
CARD& operator= (const CARD& card)
{
suit = card.suit;
value = card.value;
drawn = card.drawn;
return *this;
}
};
class Deck
{
public:
Deck();
~Deck();
Deck(const Deck& deck);
CARD drawCard();
void shuffle();
private:
void loadCards();
};
}
您可能正在通过loadCards()
中的deck
数组的末尾写loadCards()
,从而破坏了内存。
即使你有数据的确切52行, cardlist.good()
将返回true
,直到后 EOF
指示。
您可能想尝试以下循环(未经测试):
string line;
while(getline(cardList, line) && (index < 52))
{
char * context = NULL;
CARD card = CARD();
char * s = strtok_s(&line[0], ", ", &context);
card.value = *s;
s = strtok_s(NULL, ", ", &context);
card.suit = s;
card.drawn = false;
deck[index] = card;
index++;
}
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