帮忙看看这段代码错到哪了

[tianfu1]

昨天研究了一晚上文件操作，今天写了段代码，编译时没错误，运行时却提示：某段内存不能读。我用的是vc++6.0

代码如下：
//main.cpp

#include<iostream>
#include<fstream>
#include"File1.h"

using namespace std;

//---------------------------------------------------------------------------

int main(int argc, char* argv[])
{
Account a("111", "as", "123", 12.3), b("222", "sa", "321", 32.1);
fstream file;
file.open("c:\\a.txt", ios::in|ios::out|ios::binary|ios::app);
char* c;
file.write((char*)&a, sizeof(Account));
file.write((char*)&b, sizeof(Account));
if (!file.is_open())
{
cerr<<"can't open the file";
return 0;
}

while (!file.eof())
{
file.read(c, sizeof(Account));
cout<<c;
}

return 0;
}

//File1.cpp

#include<string>

using namespace std;

class Account
{
string name;
string id;
string password;
double money;

public:
Account(string n, string i, string p, double m=0)
{
name = n;
id = i;
password = p;
money = m;
}
};


各位帮忙看一看

[chlaws]

char* c;
没有分配内存 不能往里写数据
c=new char[10];

[三文鱼也会飞]

[Quote=引用 1 楼 chlaws 的回复:]
char* c;
没有分配内存 不能往里写数据
c=new char[10];
[/Quote]

正解

[devil_zuiai]

把自定义对象写入文件和读出文件
需要序列化和反序列化吧？？

[jia_xiaoxin]

//我感觉楼主最好这样写：

#include <iostream> 
#include <fstream> 
#include <string> 
using namespace std; 

class Account 
{ 
    friend ostream & operator<< (ostream& os, const Account & person);
	friend istream & operator>> (istream& in, Account & person);
	string name; 
	string id; 
	string password; 
	double money; 
	
public: 
	Account(){};
	Account(string n, string i, string p, double m=0) 
	{ 
		name = n; 
		id = i; 
		password = p; 
		money = m; 
	} 
}; 

ostream& operator << (ostream& os, const Account & person)   
{   
      os<<person.name<<endl;   
      os<<person.id<<endl;   
	  os<<person.password<<endl;  
	  os<<person.money<<endl;  
      return   os;   //返回...   
}   

istream& operator >> (istream& in, Account & person)   
{   
      in >> person.name;   
      in >> person.id;   
	  in >> person.password;  
	  in >> person.money;  
      return   in;   //返回...   
}   

//--------------------------------------------------------------------------- 

int main(int argc, char* argv[]) 
{ 
	Account a("111", "as", "123", 12.3), b("222", "sa", "321", 32.1); 

	fstream fout; 
	fout.open("c:\\a.txt", ios::out|ios::binary|ios::app); 
	
	//char * c;

	//file.write((char*)&a, sizeof(Account)); 
	//file.write((char*)&b, sizeof(Account)); 
	if (!fout.is_open()) 
	{ 
		cerr <<"can't open the file"; 
		return 0; 
	} 
	fout << a;
	fout << b;
	fout.close();

	fstream fin; 
	fin.open("c:\\a.txt", ios::in|ios::binary); 

	while (!fin.eof()) 
	{ 
		Account c; 
		//file.read(c, sizeof(Account)); 
		fin >> c;
		//cout << c;
		cout << c; 
	} 
	fin.close();

	return 0; 
} 

[双子东宝]

路过，看见已经有回答了

[tianfu1]

虽然可以了，但输出的却是一大堆乱码，但毕竟这个问题解决啦