在连续 mDNS 查询中，收到一个响应并不一定意味着不会有更多相关响应，并且查询操作将继续进行，直到不再需要响应为止。一次性查询是默认设置，因此需要进行额外设置才能使用连续查询。但是，由于 sl_NetAppDnsGetHostByService() 一次只返回一台发现的主机，请使用 sl_NetAppGetServiceList() 获取完整的服务列表。下面是一个返回列表格式为 SlNetAppGetFullServiceWithTextIpv4List_t 的示例：

#define LISTEN_SERVICE_NAME     "_workstation._tcp.local"
#define SERVICE_GET_COUNT_MAX   3   // Specify the max number of services to discover
void mDNS_Query_Continuous()
{
    _u32 pAddr;
    _u32 usPort;
    _u16 ulTextLen;
    _i8  cText[200];
    _i32 iretvalmDNS = -1;
    _i32 i;
    
    // The structure to be used for retrieving the list
    SlNetAppGetFullServiceWithTextIpv4List_t serviceList[SERVICE_GET_COUNT_MAX];
    
    // Set to perform Continuous mDNS query
    iretvalmDNS = sl_NetAppSet(SL_NET_APP_MDNS_ID, NETAPP_SET_GET_MDNS_CONT_QUERY_OPT, 0, 0);
    Report("sl_NetAppSet() return: %d\n\r", iretvalmDNS);
    
    // Set an infinite loop until getting a response
    iretvalmDNS = 1;
    while(iretvalmDNS)
    {
        ulTextLen = 200;
        iretvalmDNS = sl_NetAppDnsGetHostByService(LISTEN_SERVICE_NAME,
                     (unsigned char) strlen(LISTEN_SERVICE_NAME), SL_AF_INET,
                     (_u32 *)&pAddr, &usPort,&ulTextLen,&cText[0]);
    }
    if(iretvalmDNS == 0)
    {
        // Prints the first response, but we want more later on
        cText[ulTextLen] = '\0'; 
        Report("First Response: Addr: %d.%d.%d.%d, Port: %d, Text: %s, TextLength: %d\n\r",
             SL_IPV4_BYTE(pAddr, 3), SL_IPV4_BYTE(pAddr, 2),
             SL_IPV4_BYTE(pAddr, 1), SL_IPV4_BYTE(pAddr, 0),
             usPort, cText, ulTextLen);
    }
    
    // Get a list of discovered services
    iretvalmDNS = sl_NetAppGetServiceList(0,
                  SERVICE_GET_COUNT_MAX,
                  SL_NET_APP_FULL_SERVICE_WITH_TEXT_IPV4_TYPE,
                  (_i8*) &serviceList[0],
                  1479);
    // 1479 is the maximum number of characters to return
    
    // The function returns the total number of discovered services
    // This number will never exceed the SERVICE_GET_COUNT_MAX parameter we passed into the 
    // function
    Report("sl_NetAppSet() return: %d\n\r", iretvalmDNS);
    if(iretvalmDNS > 0)
    {
        // Now just prints all the services
        Report("Complete List:\n\r");
        for(i=0; i<iretvalmDNS; i++)
        {
            Report("Host %d: %s, IP: %d.%d.%d.%d, Name: %s Port: %d, Text: %s\n\r",
                   i,
                   serviceList[i].service_host,
                   SL_IPV4_BYTE(serviceList[i].service_ipv4, 3),
                   SL_IPV4_BYTE(serviceList[i].service_ipv4, 2),
                   SL_IPV4_BYTE(serviceList[i].service_ipv4, 1),
                   SL_IPV4_BYTE(serviceList[i].service_ipv4, 0),
                   serviceList[i].service_name,
                   serviceList[i].service_port,
                   serviceList[i].service_text);
        }
    }
}