iconv_open、iconv和iconv_close函数使用示例

 bool isUtf8(const char* str)
  
 {
 
 			    return ((0xEF == (unsigned char)(str[0])) 
 
 && (0xBB == (unsigned char)(str[1])) 
 
 && (0xBF == (unsigned char)(str[2])));
 
 }
 
 
 
 int code_convert(char *from_charset,char *to_charset, char *inbuf, size_t inlen, char *outbuf, size_t outlen)
 
 {
 
 			    iconv_t cd; 
 
 			    char **pin = &inbuf;
 
 			    char **pout = &outbuf;
 
 
 
 			    cd = iconv_open(to_charset, from_charset);
 
 if (0 == cd) return -1;
 
 if (-1 == iconv(cd, pin, &inlen, pout, &outlen)) 
 {
 
 int old_errno = errno;
 
 			        iconv_close(cd);
 
 			        errno = old_errno;
 
 			        return -1;
 
 }
 
 
 
 			    iconv_close(cd);
 
 			    return 0;
 
 }
 
 
 
 int toUtf8(char *inbuf, size_t inlen, char *outbuf, size_t outlen)
 
 {
 
 			    return code_convert("gb2312", "utf-8", inbuf, inlen, outbuf, outlen);
 
 }
 
 
 
 int toGB2312(char *inbuf, size_t inlen, char *outbuf, size_t outlen)
 
 {
 
 			    return code_convert("utf-8", "gb2312", inbuf, inlen, outbuf, outlen);
 
 }