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c++中ifstream一次读取整个文件

c++中一次读取整个文件的内容的方法:

  1. 读取至char*的情况
std::ifstream t;  int length;  t.open("file.txt");      // open input file  t.seekg(0, std::ios::end);    // go to the end  length = t.tellg();           // report location (this is the length)  t.seekg(0, std::ios::beg);    // go back to the beginning  buffer = new char[length];    // allocate memory for a buffer of appropriate dimension  t.read(buffer, length);       // read the whole file into the buffer  t.close();                    // close file handle    // ... do stuff with buffer here ...  
  1. 读取至std::string的情况:

第一种方法:

#include <string>  #include <fstream>  #include <streambuf>    std::ifstream t("file.txt");  std::string str((std::istreambuf_iterator<char>(t)),                   std::istreambuf_iterator<char>()); 

第二种方法:

#include <string>  #include <fstream>  #include <sstream>  std::ifstream t("file.txt");  std::stringstream buffer;  buffer << t.rdbuf();  std::string contents(buffer.str());

reference

http://stackoverflow.com/questions/2602013/read-whole-ascii-file-into-c-stdstring

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c++中ifstream一次读取整个文件