利用 libiconv 实现汉字编码 utf-8 格式 和 gbk格式的相互转换

参考文章:http://jimmee.iteye.com/blog/2174693

关于windows上编译libiconv的库,请参见:http://www.cnblogs.com/tangxin-blog/p/5608751.html

 #include <stdio.h>
 #include <string.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include "iconv.h"

 #define MAX_BUF_SIZE 1024

 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 (cd == )
         return -;
     memset(outbuf, , outlen);
     if (iconv(cd, pin, &inlen, pout, &outlen) == -)
         return -;
     iconv_close(cd);
     *pout = '\0';

     return ;
 }

 int utf8_to_gbk(char *inbuf, size_t inlen, char *outbuf, size_t outlen) {
     return code_convert("utf-8", "gbk", inbuf, inlen, outbuf, outlen);
 }

 int gbk_to_utf8(char *inbuf, size_t inlen, char *outbuf, size_t outlen) {
     return code_convert("gbk", "utf-8", inbuf, inlen, outbuf, outlen);
 }

 void read_file(char buf[], const int32_t max_buf_size, const char *file_name)
 {
     FILE * pFile;
     long lSize;
     size_t result;
     fopen_s(&pFile, file_name, "rb");
     if (pFile == NULL) { fputs("File error\n", stderr); exit(); }
     // obtain file size:
     fseek(pFile, , SEEK_END);
     lSize = ftell(pFile);
     rewind(pFile);
     if (lSize >= max_buf_size){ fputs("file too large\n", stderr); exit(); }
     result = fread(buf, , lSize, pFile);
     if (result != lSize) { fputs("Reading error\n", stderr); exit(); }
     fclose(pFile);
 }

 //将gbk编码的str分隔成一个一个的字符，并判断是否是汉字，并输出编码，包括简体和繁体
 void GetToken(const char *str)
 {
     int32_t i = ;
     int32_t len = strlen(str);
     short high, low;
     uint32_t code;
     char cstr[];
     for (; i < len; ++i)
     {
         if (str[i] >=  || i == len - )
         {
             printf("%c >> no\n", str[i]);   //ASCII字符
         }
         else
         {
             // 计算编码
             high = (short)str[i] + ;
             low = (short)str[i + ] + ;
             code = high *  + low;

             //获取字符
             cstr[] = str[i];
             cstr[] = str[i + ];
             cstr[] = ;
             i++;

             printf("%s >> 0x%x", cstr, code);
             if ((code >= 0xB0A1 && code <= 0xF7FE) || (code >= 0x8140 && code <= 0xA0FE) || (code >= 0xAA40 && code <= 0xFEA0))
             {
                 printf(" yes\n");
             }
             else
             {
                 printf(" no\n");
             }
         }
     }
 }

 int main(int argc, char *argv[])
 {
     char in_buf[MAX_BUF_SIZE] = {  }, out_buf[MAX_BUF_SIZE] = {  };
     read_file(in_buf, MAX_BUF_SIZE, "chinese_gbk.txt");
     printf("%s\n", in_buf);
     GetToken(in_buf);
     read_file(in_buf, MAX_BUF_SIZE, "chinese_utf8.txt");
     printf("%s\n", in_buf);
     GetToken(in_buf);
     utf8_to_gbk(in_buf, strlen(in_buf), out_buf, MAX_BUF_SIZE);
     printf("%s\n", out_buf);
     GetToken(out_buf);
     getchar();
     return ;
 }

完整工程demo:http://download.csdn.net/detail/tangxin19930330/9557218