c - ONVIF WS-Discover 1.0 - 客户端和事件处理程序

Question

在我的 onvif 客户端应用程序中，我希望使用 gsoap 和 wsddapi.c 实现 WS-Discovery，但处理程序存在问题。我可以使用soap_wsdd_probe(wsddapi.c)通过UDP发送多播消息，我已经实现了soap_bind、listen和wsdd_event_probematches，但我没有收到来自服务的消息。

<小时/>

/*MY CLIENT*/

#include "wsdd.nsmap"
#include "soapH.h"
#include "wsddapi.h"

int main () {
    struct soap* soap=soap_new();
    struct soap* serv=soap_new(); //for the listner and the event handler
    int time=100, port=53881;

    if (!soap_valid_socket(soap_bind(soap, NULL, port, 100)))
    { soap_print_fault(soap, stderr);
      exit(0);
    }

    soap->connect_flags=SO_BROADCAST;

    const char * msg_uuid = NULL;
    msg_uuid=soap_wsa_rand_uuid(soap);
    soap_wsdd_Probe(soap, SOAP_WSDD_ADHOC, SOAP_WSDD_TO_TS,"soap.udp://239.255.255.250:3702",msg_uuid, NULL,"dp0:NetworkVideoTransmitter","", NULL);

    soap_wsdd_listen(serv, 2); // listen for messages

    soap_destroy(soap);
    soap_end(soap);
    soap_done(soap);
    return 0;
}

wsddapi.c 中的事件处理程序我已经实现了 wsdd_event_probematches()

void wsdd_event_ProbeMatches(struct soap *soap, unsigned int InstanceId, const char *SequenceId, unsigned int MessageNumber, const char *MessageID, const char *RelatesTo, struct wsdd__ProbeMatchesType *matches){
    printf("MessageID:%s",MessageID);
    printf("%s",matches->ProbeMatch->XAddrs);
}

Answer 1

为了接收UDP，需要使用soap_new1(SOAP_IO_UDP)创建soap实例

gSOAP 的文档对于 WS-Discovery 插件相当晦涩，我对用于发送请求的肥皂实例和用于收集答案的肥皂实例感到困惑。
为了接收多播请求的单播答案，需要使用相同的肥皂实例:

int main(int argc, char** argv)
{
        struct soap* serv = soap_new1(SOAP_IO_UDP);
        if (!soap_valid_socket(soap_bind(serv, NULL, 0, 1000)))
        {
                soap_print_fault(serv, stderr);
                exit(1);
        }
        int res = soap_wsdd_Probe(serv, 
                                  SOAP_WSDD_ADHOC, 
                                  SOAP_WSDD_TO_TS,
                                  "soap.udp://239.255.255.250:3702",
                                  soap_wsa_rand_uuid(serv), 
                                  NULL, 
                                  NULL, 
                                  NULL, 
                                  "");
        if (res != SOAP_OK)
        {
                soap_print_fault(serv, stderr);
                exit(1);
        }
        soap_wsdd_listen(serv, 1);
        soap_destroy(serv);
        soap_end(serv);
        soap_done(serv);
        return 0;
}