C++ 文件读写操作分析文本文件与二进制文件

#include <fstream>
void test01(){  ofstream ofs;  ofs.open("test.txt", ios::out);
  ofs << "姓名：张三" << endl;  ofs << "性别：男" << endl;  ofs << "年龄：18" << endl;
  ofs.close();}
int main() {
  test01();
  system("pause");
  return 0;}

#include <fstream>#include <string>void test01(){  ifstream ifs;  ifs.open("test.txt", ios::in);
  if (!ifs.is_open())//is_open()返回类型为布尔  {    cout << "文件打开失败" << endl;    return;  }
  //第一种方式  //char buf[1024] = { 0 };  //while (ifs >> buf)  //{  //  cout << buf << endl;  //}
  //第二种  //char buf[1024] = { 0 };  //while (ifs.getline(buf,sizeof(buf)))  //{  //  cout << buf << endl;  //}
  //第三种  //string buf;  //while (getline(ifs, buf))  //{  //  cout << buf << endl;  //}
  char c;  while ((c = ifs.get()) != EOF)//EOF end of file效率低，一个字符一个字符读取  {    cout << c;  }
  ifs.close();//勿忘关闭

}
int main() {
  test01();
  system("pause");
  return 0;}

#include <fstream>#include <string>
class Person{public:  char m_Name[64];  int m_Age;};
//二进制文件  写文件void test01(){  //1、包含头文件
  //2、创建输出流对象  ofstream ofs("person.txt", ios::out | ios::binary);    //3、打开文件  //ofs.open("person.txt", ios::out | ios::binary);
  Person p = {"张三"  , 18};
  //4、写文件  ofs.write((const char *)&p, sizeof(p));
  //5、关闭文件  ofs.close();}
int main() {
  test01();
  system("pause");
  return 0;}

#include <fstream>#include <string>
class Person{public:  char m_Name[64];  int m_Age;};
void test01(){  ifstream ifs("person.txt", ios::in | ios::binary);  if (!ifs.is_open())  {    cout << "文件打开失败" << endl;  }
  Person p;  ifs.read((char *)&p, sizeof(p));
  cout << "姓名： " << p.m_Name << " 年龄： " << p.m_Age << endl;}
int main() {
  test01();
  system("pause");
  return 0;}