关于文件读写

只看该作者 · 2012-4-13 18:17

#include <iostream>#include <fstream>
#include <vector>
#include <string>
#include <iostream>
using
namespace std;
class CPeople
{
public:
void showinformation();
CPeople(string name,int age);
void getinformation();
private:
int m_age;
string m_name;
};

void CPeople::getinformation()
{
cout <<"enter name: ";
cin >>m_name;
cout <<"enter age: ";
cin >>m_age;
}

CPeople::CPeople(string name, int age)
{
m_name = name;
m_age = age;
}

void CPeople::showinformation(){ cout <<"name: "
<<m_name;
cout <<" age: "
<<m_age <<endl;
}

int main()
{
ifstream infile;
ofstream outfile;
string choice;
vector<CPeople> vpeople;
CPeople peo("zhangsan",20);
//    outfile.open("people.txt",ios_base::out|ios_base::binary);
//    do
//    {
//       peo.getinformation();
//       vpeople.push_back(peo);
//       outfile.write(reinterpret_cast<char *>(&peo),sizeof(peo));
//       cout <<"continue?[yes/no]: ";
//       cin >>choice;
//       cin.sync();
//    } while (choice[0] != 'n');
//    outfile.close();
//    for (vector<CPeople>::size_type ix = 0; ix < vpeople.size(); ++ix)
//    {
//       vpeople[ix].showinformation();
//    }
//不注释以上代码程序可以正确执行  当注释时  在文件中读时就出错了
infile.open("people.txt",ios_base::in|ios_base::binary);
while (infile.peek()!=EOF)
{
      infile.read(reinterpret_cast<char
*>(&peo),sizeof(peo));
      peo.showinformation();
}
infile.close();
return
0;
}

只看该作者 · 2012-4-13 18:35

infile.open("people.txt",ios_base::in|ios_base::binary);
  if (infile.eof())//在这儿加个判断就好了
  {
cout << "file is empty."<<endl;
return 0;
  }
  while (infile.peek()!=EOF)

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