unicode file

#include <stdlib.h> 
#include <stdio.h> 
#include <locale.h> 
#include <wchar.h> 

int main() 
{ 
// " Unicode " Unicode  
FILE *file = fopen("test.txt","wb"); 
wchar_t wstr[] = L" Unicode "; 
wchar_t strSign = 0xfeff; 
int len = wcslen(wstr); 
fwrite(&strSign,1,2,file); 
fwrite(wstr,1,len*2,file); 
fclose(file); 

// ，  
file = fopen("test.txt","rb"); 
int nFileLen; 
wchar_t buffer[100] = {0}; // ， 99  
if(file) 
{ 
fseek(file,0,SEEK_END); 
nFileLen = ftell(file); 
fseek(file,0,SEEK_SET); 
fread(buffer,1,nFileLen,file); 
} 
else 
{ 
printf("file does not exists.
"); 
getchar(); 
return 0; 
} 
if(buffer[0] == 0xfeff) 
{ 
printf("it's a Unicode file
");//is unicode 
char strBuffer[200]={0}; 
if (!setlocale(LC_ALL, "chs")) 
{ 
perror("chs"); 
getchar(); 
return 0; 
} 
wcstombs(strBuffer,&buffer[1] , 200); 
printf("%s",strBuffer); 
} 
else 
printf("it's not a Unicode file
");//not unicode 
fclose(file); 
getchar(); 
return 0; 
}