C++中string的运用如何把文件里string读给对象里的string

 /* fread example: read an entire file */ 
#include <stdio.h> 
#include <stdlib.h> 
int main () { 
FILE * pFile; 
long lSize; 
char * buffer; 
size_t result; 
pFile = fopen ( "myfile.bin" , "rb" ); 
if (pFile==NULL) {fputs ("File error",stderr); exit (1);} 
// obtain file size: 
fseek (pFile , 0 , SEEK_END); 
lSize = ftell (pFile); 
rewind (pFile); 
// allocate memory to contain the whole file: 
buffer = (char*) malloc (sizeof(char)*lSize); 
if (buffer == NULL) {fputs ("Memory error",stderr); exit (2);} 
// copy the file into the buffer: 
result = fread (buffer,1,lSize,pFile); 
if (result != lSize) {fputs ("Reading error",stderr); exit (3);} 
/* the whole file is now loaded in the memory buffer. */ 
// terminate 
fclose (pFile); 
free (buffer); 
return 0; 
}

构建函数建一个string 对象，把 char * buffer 内容存入 程序部分，请自己补充:
#include <windows.h>
#include<iostream>
#include <string>
using namespace std;
#include <stdio.h>
// 插入上面程序 .....
// 补充
string sss;
sss.assign(buffer,result);
cout << sss << endl;