{
    const char* p = "\r\n";
    
    std::ofstream f1("d:\\1.a");           
    f1.write(p,strlen(p));
    f1.close(); 
    
    std::ofstream f2("d:\\2.a",std::ios::binary);           
    f2.write(p,strlen(p));
    f2.close();
   }

开发环境：Win10+VC6

用UE打开 1.a三个字节\r\r\n 2.a两个字节\r\n