C语言-字符编码转换：UTF与GB2312

依赖库libiconv，libiconv库的交叉编译不做描述，网上很多

 #include <stdio.h>
 #include <stdlib.h>
 #include <stdint.h>
 #include "iconv.h"
 #include "eventlist.h"
 
 static int ChangeCode( const char* pFromCode, const char* pToCode, const char* pInBuf,
                  size_t* piInLen,  char* pOutBuf,  size_t* piOutLen )
 {
     int iRet;
     char **pin = &pInBuf;
     char **pout = &pOutBuf;
     iconv_t hIconv;
 
     //printf("%s: outlen=%d, inlen=%d\n", __FUNCTION__, *piOutLen, *piInLen);
 
     //打开字符集转换
     hIconv = iconv_open( pToCode, pFromCode );
     if ( - == (int)hIconv )
     {
         perror("iconv_open");
         return -;
     }
     //开始转换
     printf("%s: 1 outlen=%d\n", __FUNCTION__, *piOutLen);
     iRet = iconv( hIconv, pin, piInLen, pout, piOutLen );
     if ( - == iRet )
     {
         perror("iconv");
         return -;
     }
     printf("%s: 2 outlen=%d\n", __FUNCTION__, *piOutLen);
 
     //关闭字符集转换
     iconv_close( hIconv );
 
     **pout = '\0';
     return iRet;
 }
 
 static int MAIN_UTFToGb2312(char  * pcFrom, char * pcTo, int iMaxToLen)
 {
     char * psInBuf = NULL;
     char * psOutBuf = NULL;
     unsigned int iInLen = ;
     unsigned int iOutLen = ;
     int iRet;
 
     iInLen = strlen(pcFrom)+;
     psInBuf = (char *)malloc(iInLen);
     if ( NULL == psInBuf )
     {
         return ;
     }
     memset(psInBuf, 0x0, iInLen);
     memcpy(psInBuf, pcFrom, iInLen);
 
     iOutLen = iMaxToLen;
     psOutBuf = (char *)malloc(iOutLen);
     if ( NULL == psOutBuf )
     {
         free(psInBuf);
         psInBuf = NULL;
         return ;
     }
     memset(psOutBuf, 0x0, iOutLen);
 
     iRet = ChangeCode( "utf-8", "gb2312",  psInBuf, &iInLen, psOutBuf, &iOutLen );
     //iRet = u2g(psInBuf, iInLen, psOutBuf, iOutLen);
     if (  != iRet )
     {
         printf("ChangeCode: Error\n");
         //return 0;
     }
     memcpy(pcTo, psOutBuf, iOutLen);
     printf("%s: iOutLen = %d\n", __FUNCTION__, iOutLen);
 
     free(psInBuf);
     psInBuf = NULL;
     free(psOutBuf);
     psOutBuf = NULL;
 
     return iOutLen;
 
 }
 
 static int MAIN_GB2312ToUTF(char  * pcFrom, char * pcTo, int iMaxToLen)
 {
     char * psInBuf = NULL;
     char * psOutBuf = NULL;
     unsigned int iInLen = ;
     unsigned int iOutLen = ;
     int iRet;
 
     iInLen = strlen(pcFrom)+;
     psInBuf = (char *)malloc(iInLen);
     if ( NULL == psInBuf )
     {
         return ;
     }
     memset(psInBuf, 0x0, iInLen);
     memcpy(psInBuf, pcFrom, iInLen);
 
     iOutLen = iMaxToLen;
     psOutBuf = (char *)malloc(iOutLen);
     if ( NULL == psOutBuf )
     {
         free(psInBuf);
         psInBuf = NULL;
         return ;
     }
     memset(psOutBuf, 0x0, iOutLen);
 
     iRet = ChangeCode( "gb2312", "utf-8",  psInBuf, &iInLen, psOutBuf, &iOutLen );
     //iRet = u2g(psInBuf, iInLen, psOutBuf, iOutLen);
     if (  != iRet )
     {
         printf("ChangeCode: Error\n");
         //return 0;
     }
     memcpy(pcTo, psOutBuf, iOutLen);
     printf("%s: iOutLen = %d\n", __FUNCTION__, iOutLen);
 
     free(psInBuf);
     psInBuf = NULL;
     free(psOutBuf);
     psOutBuf = NULL;
 
     return iOutLen;
 
 }
 
 int main()
 {
     char strUTF[]={
                      0xE5, 0xBC, 0x80, 0xE8,0xBD, 0xA6, 0xE4, 0xBA, 0x8B, 0xE4, 0xBB, 0xB6, 0xE5, 0xBC, 0x80, 0xE8,0xBD, 0xA6, 0xE4, 0xBA, 0x8B, 0xE4, 0xBB, 0xB6,
                      0xE5, 0xBC, 0x80, 0xE8,0xBD, 0xA6, 0xE4, 0xBA, 0x8B, 0xE4, 0xBB, 0xB6, 0xE5, 0xBC, 0x80, 0xE8,0xBD, 0xA6, 0xE4, 0xBA, 0x8B, 0xE4, 0xBB, 0xB6,
                      0xE5, 0xBC, 0x80, 0xE8,0xBD, 0xA6, 0xE4, 0xBA, 0x8B, 0xE4, 0xBB, 0xB6, 0xE5, 0xBC, 0x80, 0xE8,0xBD, 0xA6, 0xE4, 0xBA, 0x8B, 0xE4, 0xBB, 0xB6,
                      0xE5, 0xBC, 0x80, 0xE8,0xBD, 0xA6, 0xE4, 0xBA, 0x8B, 0xE4, 0xBB, 0xB6, 0xE5, 0xBC, 0x80, 0xE8,0xBD, 0xA6, 0xE4, 0xBA, 0x8B, 0xE4, 0xBB, 0xB6,
                      0xE5, 0xBC, 0x80, 0xE8,0xBD, 0xA6, 0xE4, 0xBA, 0x8B, 0xE4, 0xBB, 0xB6, 0xE5, 0xBC, 0x80, 0xE8,0xBD, 0xA6, 0xE4, 0xBA, 0x8B, 0xE4, 0xBB, 0xB6,
                      0xE5, 0xBC, 0x80, 0xE8,0xBD, 0xA6, 0xE4, 0xBA, 0x8B, 0xE4, 0xBB, 0xB6, 0xE5, 0xBC, 0x80, 0xE8,0xBD, 0xA6, 0xE4, 0xBA, 0x8B, 0xE4, 0xBB, 0xB6,
                      0x00, 0x00, 0x00
                   };
     char chTmpStr[];
     int len = ;
 
     memset(chTmpStr, 0x0, );
     MAIN_UTF2Gb2312(strUTF, chTmpStr, );
     printf("Main: change=%s\n", chTmpStr);
 
     return ;
 }