利用c++的stream類

標頭檔案：#include <fstream>

1.讀檔案

string strRes；

string strPath = “/opt/test/test.txt”;

if (access(strPath .c_str(), 0) == 0)  //如果路徑存在

{

     ifstream ifFile(strPath .c_str());

      ifFile >> strRes;

      ifFile.close();

}

2.寫檔案

string strVal = “hello world”;

string strPath = “/opt/test/test.txt”;

ofstream write_file(strPath .c_str());

write_file << strVal;

write_file.close();