iconvをC++で使う例(C++17必要)

sample_iconv.cpp

bool conv_iconv(const std::vector<uint8_t> *src,std::string &dest,const char* fromcode,const char* tocode)
{
	iconv_t ic = iconv_open(tocode,fromcode);
	char *pin = (char*) src->data();
	size_t ilen = src->size();
	size_t blen = ilen*3+10;
	size_t olen = blen;
	size_t ret;

	dest.resize(olen);

	char *pou = (char*)dest.data();
	ret = iconv(ic,&pin,&ilen,&pou,&olen);
	if(ret == (size_t)-1){
		// error
		dest.clear();
		return false;
	}
	*pou = '\0';
	dest.resize(blen - olen);
	iconv_close(ic);
	return true;
}