用c ++编写文本/二进制文件最优雅的方法是什么？ [英] What is the most elegant way to write a text/binary file with c++?

问题描述

我在阅读时发现了一些很好的结果，例如：用迭代器和预分配读取txt 或读入容器。所以我想知道如何写一个最优雅的std ::字符串到一个文件？

编辑：当阅读我可以预先分配空间的字符串通过seek和tellg，因为我知道字符串的大小，我怎么能告诉文件系统我要写多少？

解决方案

这里有一个小例子关于如何输出一个 std :: string ，但你应该阅读 fstream

  #include< iostream> 
 #include< fstream> 
 #include< string> 
 $ b int main（int argc，char * argv []）
 {
 
 std :: string s（writemeout）; 
 std :: ofstream outfile（output.txt）; 
 if（！outfile.is_open（））{
 std :: cerr<< 无法打开'output.txt'<<的std :: ENDL; 
返回-1; 
} 
 
 outfile<< s<的std :: ENDL; 
 outfile.close（）; 
返回0; 
} 
  

I found some good results on reading e.g.: Read txt with iterators and preallocation, or read into containers. So I wondered how would I write most elegant a std::string into a file?

Edit: When reading I can preallocate space for the string via seek and tellg, since I know the size of the string, how could I tell the filesystem how much I want to write?

解决方案

Here's a tiny example on how to output a std::string, but you should really read up on fstream

#include <iostream>
#include <fstream>
#include <string>

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

  std::string s("writemeout");
  std::ofstream outfile("output.txt");
  if(!outfile.is_open()) {
    std::cerr << "Couldn't open 'output.txt'" << std::endl;
    return -1;
  }

  outfile << s << std::endl;
  outfile.close();
  return 0;
}

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