iconv_open、iconv和iconv_close函数使用示例

1. bool isUtf8(const char* str)
   
2. {
   
3.     return ((0xEF == (unsigned char)(str[0]))
   
4.          && (0xBB == (unsigned char)(str[1]))
   
5.          && (0xBF == (unsigned char)(str[2])));
   
6. }
   
7. 
   
8. int code_convert(char *from_charset,char *to_charset, char *inbuf, size_t inlen, char *outbuf, size_t outlen)
   
9. {
   
10.     iconv_t cd;
    
11.     char **pin = &inbuf;
    
12.     char **pout = &outbuf;
    
13.     
    
14.     cd = iconv_open(to_charset, from_charset);
    
15.     if (0 == cd) return -1;
    
16.     if (-1 == iconv(cd, pin, &inlen, pout, &outlen))
17.     {
    
18.         int old_errno = errno;
    
19.         iconv_close(cd);
    
20.         errno = old_errno;
    
21.         return -1;
    
22.     }
    
23. 
    
24.     iconv_close(cd);
    
25.     return 0;
    
26. }
    
27. 
    
28. int toUtf8(char *inbuf, size_t inlen, char *outbuf, size_t outlen)
    
29. {
    
30.     return code_convert("gb2312", "utf-8", inbuf, inlen, outbuf, outlen);
    
31. }
    
32. 
    
33. int toGB2312(char *inbuf, size_t inlen, char *outbuf, size_t outlen)
    
34. {
    
35.     return code_convert("utf-8", "gb2312", inbuf, inlen, outbuf, outlen);
    
36. }