WinRT string conversion

gistfile1.cpp

std::wstring StringConverter::StringToWideString(const std::string& s) {
	int len = MultiByteToWideChar(CP_UTF8, 0, s.c_str(), s.length(), NULL, 0);
	std::wstring ws(L"", len);
	wchar_t* pWSBuf = const_cast<wchar_t*>(ws.c_str());
	MultiByteToWideChar(CP_UTF8, 0, s.c_str(), -1, pWSBuf, len);
	return ws;
}

std::string StringConverter::WideStringToString(const std::wstring& ws) {
	int len = WideCharToMultiByte(CP_UTF8, 0, ws.c_str(), ws.length(), 0, 0, NULL, NULL);
	std::string r("", len);
	char* pRBuf = const_cast<char*>(r.c_str());
	WideCharToMultiByte(CP_UTF8, 0, ws.c_str(), ws.length(), pRBuf, len, NULL, NULL);
	return r;
}

Platform::String^ StringConverter::LPSTRToPlatformString(const char* lpstr) {
	if (lpstr == nullptr || strlen(lpstr) == 0)
		return ref new Platform::String();

	int len = MultiByteToWideChar(CP_UTF8, 0, lpstr, strlen(lpstr), NULL, 0);
	auto ps = ref new Platform::String(L"", len);
	wchar_t* pPSBuf = const_cast<wchar_t*>(ps->Data());
	MultiByteToWideChar(CP_UTF8, 0, lpstr, -1, pPSBuf, len);
	return ps;
}

Platform::String^ StringConverter::StringToPlatformString(const std::string& s) {
	if (s.empty())
		return ref new Platform::String();

	int len = MultiByteToWideChar(CP_UTF8, 0, s.c_str(), s.length(), NULL, 0);
	auto ps = ref new Platform::String(L"", len);
	wchar_t* pPSBuf = const_cast<wchar_t*>(ps->Data());
	MultiByteToWideChar(CP_UTF8, 0, s.c_str(), -1, pPSBuf, len);
	return ps;
}

std::string StringConverter::PlatformStringToString(Platform::String^ ps) {
	int len = WideCharToMultiByte(CP_UTF8, 0, ps->Data(), ps->Length(), 0, 0, NULL, NULL);
	std::string r("", len);
	char* pRBuf = const_cast<char*>(r.c_str());
	WideCharToMultiByte(CP_UTF8, 0, ps->Data(), ps->Length(), pRBuf, len, NULL, NULL);
	return r;
}