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Код: Выделить всё

wchar_t * utf8_to_unicode(char *utf8_string)
{
	int err;
	wchar_t * res;
	int res_len = MultiByteToWideChar(
		CP_UTF8,			// Code page
		0,					// No flags
		utf8_string,		// Multibyte characters string
		-1,					// The string is NULL terminated
		NULL,				// No buffer yet, allocate it later
		0					// No buffer
		);
	if (res_len == 0) 
	{
		printf("Failed to obtain utf8 string length\n");
		return NULL;
	}
	res = (wchar_t *)calloc(sizeof(wchar_t), res_len);
	if (res == NULL) 
	{
		printf("Failed to allocate unicode string\n");
		return NULL;
	}
	err = MultiByteToWideChar(
		CP_UTF8,			// Code page
		0,					// No flags
		utf8_string,		// Multibyte characters string
		-1,					// The string is NULL terminated
		res,				// Output buffer
		res_len				// buffer size
		);
	if (err == 0)
	{
		printf("Failed to convert to unicode\n");
		free(res);
		return NULL;
	}
	return res;
}

Код: Выделить всё

std::wstring_convert<std::codecvt_utf8<wchar_t> > conv;

std::wstring utf8_to_unicode(const std::string& utf8_string)
{
   return conv.from_bytes(utf8_string);
}