关于编码转换iconv_open("UTF-8", "GBK")失败

PassionUranus

问题解决了，我是看了头文件里的解释， 再配合各位的分析解决的。
/* We would like to #include any system header file which could define
   iconv_t, 1. in order to eliminate the risk that the user gets compilation
   errors because some other system header file includes /usr/include/iconv.h
   which defines iconv_t or declares iconv after this file, 2. when compiling
   for LIBICONV_PLUG, we need the proper iconv_t type in order to produce
   binary compatible code.
   But gcc's #include_next is not portable. Thus, once libiconv's iconv.h
   has been installed in /usr/local/include, there is no way any more to
   include the original /usr/include/iconv.h. We simply have to get away
   without it.
   Ad 1. The risk that a system header file does
   #include "iconv.h"  or  #include_next "iconv.h"
   is small. They all do #include <iconv.h>.
   Ad 2. The iconv_t type is a pointer type in all cases I have seen. (It
   has to be a scalar type because (iconv_t)(-1) is a possible return value
   from iconv_open().) */

/* Define iconv_t ourselves. */
#undef iconv_t

PassionUranus

我就属于Ad2的情况，我编译的时候指向了系统自带的库，呵呵

xiangshifu

他发的代码有问题，如果转换失败之后，就没有释放指针。正常的代码应该如下：

    int ConvertEnc( const char *lpszFrom, const char *lpszTo, const char* lpszSrc, int nSrcLen, char* lpszDest, int* lpnDestLen)
    {
        iconv_t cv;

        if ((cv = iconv_open(lpszTo, lpszFrom)) == (iconv_t)-1)
        {
            return -1;
        }
        iconv(cv, NULL, NULL, NULL, NULL);

        char* lpszSrc1 = (char*)lpszSrc;
        int ret = iconv(cv, &lpszSrc1, (size_t *)&nSrcLen, &lpszDest, (size_t *)lpnDestLen);
        if (ret == -1)
        {
            iconv_close(cv);
            return -1;
        }
        iconv_close(cv);

        return 0;
    }

wwdwwd

iconv(cv, NULL, NULL, NULL, NULL);的意思是把iconv描述符的状态置为初始状态，这里没必要用吧？

linuxlixk

{:3_190:}