C++ 文件内容的读写

 在C++的各种库中，基本都有对文件的读写操作的类。然而windows的基本库中对文件的操作应该是最快捷和简单的了。

 

1.查看文件是否存在，需要引入<stdio.h>  

 

#include <windows.h>                                           
#include <stdio.h>                                                 
#include <iostream>                                             

                                                                                                           

int main(int argc, char* argv[])                              

{                                                                               

  FILE* pf = fopen(fileName, "r");                         
                                                                                
  if (!pf)                                                                    
  {                                                                             
    cerr<<"There is no file:" << fileName << endl;
    return false;
  }                                                                              

  fclose(pf);                                                             

  return 0；                                                               

}

 

2.文件的写入，再来看看另一个库<fstream>

 

#include <windows.h>                                                
#include <stdio.h>                                                      
#include <iostream>                                                  
#include <fstream>                                                    

int main(int argc, char* argv[])                                   

{                                                                                    

  ofstream ofile;                                                            
  ofile.open("images_compare_result.txt", ios::out);
  ofile << endl << endl;                                                
  ofile << "It' over！" << endl;                                     

   ofile.close();                                                              

}                                                                                                                  

它的用法与cin，cout一致，是不是很简单，还很快哟！ 啊哈哈哈哈！