MFC Convert CString encoding between UTF-8 and UTF-16

CStringCodeConverter.cpp

static CStringA UTF16_UTF8(const CStringW& utf16)
{
	if (utf16.IsEmpty()) return "";
	CStringA utf8;
	int cc = 0;

	if ((cc = WideCharToMultiByte(CP_UTF8, 0, utf16, -1, NULL, 0, 0, 0) - 1) > 0)
	{
		char * buf = utf8.GetBuffer(cc);
		if (buf) WideCharToMultiByte(CP_UTF8, 0, utf16, -1, buf, cc, 0, 0);
		utf8.ReleaseBuffer();
	}
	return utf8;
}

static CStringW UTF8_UTF16(const CStringA& utf8)
{
	if (utf8.IsEmpty()) return L"";
	CStringW utf16;
	int cc = 0;
	
	if ((cc = MultiByteToWideChar(CP_UTF8, 0, utf8, -1, NULL, 0) - 1) > 0)
	{
		wchar_t *buf = utf16.GetBuffer(cc);
		if (buf) MultiByteToWideChar(CP_UTF8, 0, utf8, -1, buf, cc);
		utf16.ReleaseBuffer();
	}
	return utf16;
}

There is no need to do encoding conversion, because CString uses UNICODE to represent strings internally

Thanks you! This helped me toconvert libmaxminddb's utf8 std::string to proper CString.