iconv_practice.cpp

#include <stdio.h>
#include <iconv.h>
#include <string.h>
#include <errno.h>
#include <stdint.h>

int conv_utf8_to_ucs2(const char* src, size_t len)
{
    iconv_t cb = iconv_open("UTF-16", "UTF-8");
    if (cb == (iconv_t)(-1))
        return 0;

    uint16_t* outBuff = new uint16_t[len + 1];
    char* pout = (char*) outBuff;
    size_t inRemains = len;
    size_t outRemains = len * sizeof(uint16_t);

    printf("inRemains:%d outRemains:%d\n", (int)inRemains, (int)outRemains);

    size_t cvtlen = iconv(cb, (char**)&src, (size_t*)&inRemains, (char**)&pout, (size_t*)&outRemains);
    if (cvtlen == (size_t) - 1) {
        printf("error:%s, %d\n", strerror(errno), errno);
        goto out;
    }
    *pout = 0;

    printf("inRemains:%d outRemains:%d cvtlen:%d\n", (int)inRemains, (int)outRemains, (int)cvtlen);

    for (int i = 0; (i < len) && outBuff[i] ; i++)
        printf("0x%04x\n", outBuff[i]);

out:
    if(outBuff)
        delete[] outBuff;
    iconv_close(cb);

    return 0;
}

int main(int argc, char** argv)
{
    char utf8_str[] = "안녕 세상아?";
    int len = strlen(utf8_str);

    conv_utf8_to_ucs2(utf8_str, len);

    return 0;
}