在搜索蓝牙设备时，初始化蓝牙枚举结构

DWORD dwWsaqsLen = sizeof(WSAQUERYSET);

LPWSAQUERYSET lpWsaqs = (LPWSAQUERYSET)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, dwWsaqsLen);
lpWsaqs->dwSize = sizeof(WSAQUERYSET);
lpWsaqs->dwNameSpace = NS_BTH;
请大神帮我解析下这段代码，初学者，急急急，拜托啦

根据结构体大小，分配空间，然后给对应的两个变量赋值