string 转换为 LPCWSTR

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	LPCWSTR stringToLPCWSTR(std::string orig)
	{
		size_t origsize = orig.length() + 1;
		size_t convertedChars = 0;
		wchar_t *wcstring = (wchar_t *)malloc(sizeof(wchar_t)*(orig.length()-1));
		mbstowcs_s(&convertedChars, wcstring, origsize, orig.c_str(), _TRUNCATE);

		return wcstring;
	}