C++ PLT_ActionReference::SetArgumentValue方法代码示例

/*----------------------------------------------------------------------
|   PLT_MediaController::SetAVTransportURI
+---------------------------------------------------------------------*/
NPT_Result 
PLT_MediaController::SetAVTransportURI(PLT_DeviceDataReference& device, 
                                       NPT_UInt32               instance_id, 
                                       const char*              uri,
                                       const char*              metadata,
                                       void*                    userdata)
{
    PLT_ActionReference action;
    NPT_CHECK_SEVERE(m_CtrlPoint->CreateAction(
        device, 
        "urn:schemas-upnp-org:service:AVTransport:1", 
        "SetAVTransportURI", 
        action));

    // set the uri
    if (NPT_FAILED(action->SetArgumentValue("CurrentURI", uri))) {
        return NPT_ERROR_INVALID_PARAMETERS;
    }

    // set the uri metadata
    if (NPT_FAILED(action->SetArgumentValue("CurrentURIMetaData", metadata))) {
        return NPT_ERROR_INVALID_PARAMETERS;
    }

    return InvokeActionWithInstance(action, instance_id, userdata);
}

/*----------------------------------------------------------------------
|   PLT_MediaController::SetVolume
+---------------------------------------------------------------------*/
NPT_Result PLT_MediaController::SetVolume(PLT_DeviceDataReference&  device,
										  NPT_UInt32				instance_id, 
										  const char*               channel,
										  int						volume, 
										  void*						userdata) 
{

    PLT_ActionReference action;
    NPT_CHECK_SEVERE(m_CtrlPoint->CreateAction(
        device, 
        "urn:schemas-upnp-org:service:RenderingControl:1", 
        "SetVolume", 
        action));

	    // set the channel
    if (NPT_FAILED(action->SetArgumentValue("Channel", channel))) {
        return NPT_ERROR_INVALID_PARAMETERS;
    }

	if (NPT_FAILED(action->SetArgumentValue("DesiredVolume",  
											NPT_String::FromInteger(volume)))) {
		return NPT_ERROR_INVALID_PARAMETERS;
	}

    return InvokeActionWithInstance(action, instance_id, userdata);
}

    bool InvokeUpdateObject(const char* id, const char* curr_value, const char* new_value)
    {
        CURL url(id);
        PLT_DeviceDataReference device;
        PLT_Service* cds;
        PLT_ActionReference action;

        CLog::Log(LOGDEBUG, "UPNP: attempting to invoke UpdateObject for %s", id);

        // check this server supports UpdateObject action
        NPT_CHECK_LABEL(FindServer(url.GetHostName().c_str(), device),failed);
        NPT_CHECK_LABEL(device->FindServiceById("urn:upnp-org:serviceId:ContentDirectory", cds),failed);

        NPT_CHECK_LABEL(m_CtrlPoint->CreateAction(
            device,
            "urn:schemas-upnp-org:service:ContentDirectory:1",
            "UpdateObject",
            action), failed);

        NPT_CHECK_LABEL(action->SetArgumentValue("ObjectID", url.GetFileName().c_str()), failed);
        NPT_CHECK_LABEL(action->SetArgumentValue("CurrentTagValue", curr_value), failed);
        NPT_CHECK_LABEL(action->SetArgumentValue("NewTagValue", new_value), failed);

        NPT_CHECK_LABEL(m_CtrlPoint->InvokeAction(action, NULL),failed);

        CLog::Log(LOGDEBUG, "UPNP: invoked UpdateObject successfully");
        return true;

    failed:
        CLog::Log(LOGINFO, "UPNP: invoking UpdateObject failed");
        return false;
    }

/*----------------------------------------------------------------------
|   PLT_MediaController::GetCurrentConnectionInfo
+---------------------------------------------------------------------*/
NPT_Result 
PLT_MediaController::GetCurrentConnectionInfo(PLT_DeviceDataReference& device, 
                                              NPT_UInt32               connection_id,
                                              void*                    userdata)
{
    PLT_ActionReference action;
    NPT_CHECK_SEVERE(m_CtrlPoint->CreateAction(
        device, 
        "urn:schemas-upnp-org:service:ConnectionManager:1", 
        "GetCurrentConnectionInfo", 
        action));

    // set the New PlayMode
    if (NPT_FAILED(action->SetArgumentValue("ConnectionID", 
                                            NPT_String::FromInteger(connection_id)))) {
        return NPT_ERROR_INVALID_PARAMETERS;
    }

    // set the arguments on the action, this will check the argument values
    if (NPT_FAILED(m_CtrlPoint->InvokeAction(action, userdata))) {
        return NPT_ERROR_INVALID_PARAMETERS;
    }

    return NPT_SUCCESS;
}

/*----------------------------------------------------------------------
|   PLT_LightSampleDevice::OnAction
+---------------------------------------------------------------------*/
NPT_Result
PLT_LightSampleDevice::OnAction(PLT_ActionReference& action, NPT_SocketInfo* /* info */)
{
    /* parse the action name */
    NPT_String name = action->GetActionDesc()->GetName();
    if (name.Compare("SetTarget") == 0) {
        NPT_String value;
        action->GetArgumentValue("newTargetValue", value);

        PLT_StateVariable* variable = action->GetActionDesc()->GetService()->FindStateVariable("Status");
        if (NPT_FAILED(variable->SetValue(value))) {
            action->SetError(402, "Invalid Args");
            return NPT_FAILURE;
        }
        return NPT_SUCCESS;
    } else if (name.Compare("GetStatus") == 0) {
        PLT_StateVariable* variable = action->GetActionDesc()->GetService()->FindStateVariable("Status");
        if (variable) {
            action->SetArgumentValue("ResultStatus", variable->GetValue());
            return NPT_SUCCESS;
        }
    }
    
    action->SetError(501, "Action Failed");
    return NPT_FAILURE;
}

/*----------------------------------------------------------------------
|   PLT_MediaServer::OnGetCurrentConnectionInfo
+---------------------------------------------------------------------*/
NPT_Result
PLT_MediaServer::OnGetCurrentConnectionInfo(PLT_ActionReference&          action, 
                                            const PLT_HttpRequestContext& context)
{
    NPT_COMPILER_UNUSED(context);

    if (NPT_FAILED(action->VerifyArgumentValue("ConnectionID", "0"))) {
        action->SetError(706,"No Such Connection.");
        return NPT_FAILURE;
    }

    if (NPT_FAILED(action->SetArgumentValue("RcsID", "-1"))){
        return NPT_FAILURE;
    }
    if (NPT_FAILED(action->SetArgumentValue("AVTransportID", "-1"))) {
        return NPT_FAILURE;
    }
    if (NPT_FAILED(action->SetArgumentValue("ProtocolInfo", "http-get:*:*:*"))) {
        return NPT_FAILURE;
    }
    if (NPT_FAILED(action->SetArgumentValue("PeerConnectionManager", "/"))) {
        return NPT_FAILURE;
    }
    if (NPT_FAILED(action->SetArgumentValue("PeerConnectionID", "-1"))) {
        return NPT_FAILURE;
    }
    if (NPT_FAILED(action->SetArgumentValue("Direction", "Output"))) {
        return NPT_FAILURE;
    }
    if (NPT_FAILED(action->SetArgumentValue("Status", "Unknown"))) {
        return NPT_FAILURE;
    }

    return NPT_SUCCESS;
}

/*----------------------------------------------------------------------
|   PLT_MediaRenderer::OnGetCurrentConnectionInfo
+---------------------------------------------------------------------*/
NPT_Result
PLT_MediaRenderer::OnGetCurrentConnectionInfo(PLT_ActionReference& action)
{
    if (NPT_FAILED(action->VerifyArgumentValue("ConnectionID", "0"))) {
        action->SetError(706,"No Such Connection.");
        return NPT_FAILURE;
    }

    if (NPT_FAILED(action->SetArgumentValue("RcsID", "0"))){
        return NPT_FAILURE;
    }
    if (NPT_FAILED(action->SetArgumentValue("AVTransportID", "0"))) {
        return NPT_FAILURE;
    }
    if (NPT_FAILED(action->SetArgumentValue("ProtocolInfo", "http-get:*:*:*"))) {
        return NPT_FAILURE;
    }
    if (NPT_FAILED(action->SetArgumentValue("PeerConnectionManager", "/"))) {
        return NPT_FAILURE;
    }
    if (NPT_FAILED(action->SetArgumentValue("PeerConnectionID", "-1"))) {
        return NPT_FAILURE;
    }
    if (NPT_FAILED(action->SetArgumentValue("Direction", "Input"))) {
        return NPT_FAILURE;
    }
    if (NPT_FAILED(action->SetArgumentValue("Status", "Unknown"))) {
        return NPT_FAILURE;
    }

    return NPT_SUCCESS;
}

/*----------------------------------------------------------------------
|       PLT_MediaConnect::OnRegisterDevice
+---------------------------------------------------------------------*/
NPT_Result
PLT_MediaConnect::OnRegisterDevice(PLT_ActionReference&  action)
{
    NPT_String reqMsgBase64;
    NPT_CHECK_WARNING(action->GetArgumentValue("RegistrationReqMsg", reqMsgBase64));

    NPT_String respMsgBase64;
    NPT_CHECK_WARNING(action->SetArgumentValue("RegistrationRespMsg", respMsgBase64));
    return NPT_SUCCESS;
}

/*----------------------------------------------------------------------
|   PLT_MediaBrowser::Browse
+---------------------------------------------------------------------*/
NPT_Result 
PLT_MediaBrowser::Browse(PLT_DeviceDataReference& device, 
                         const char*              obj_id,
                         NPT_UInt32               start_index,
                         NPT_UInt32               count,
                         bool                     browse_metadata,
                         const char*              filter,
                         const char*              sort_criteria,
                         void*                    userdata)
{
    // verify device still in our list
    PLT_DeviceDataReference device_data;
    NPT_CHECK_WARNING(FindServer(device->GetUUID(), device_data));

    // create action
    PLT_ActionReference action;
    NPT_CHECK_SEVERE(m_CtrlPoint->CreateAction(
        device, 
        "urn:schemas-upnp-org:service:ContentDirectory:1",
        "Browse",
        action));

    // Set the object id
    PLT_Arguments args;
    if (NPT_FAILED(action->SetArgumentValue("ObjectID", obj_id))) {
        return NPT_ERROR_INVALID_PARAMETERS;
    }

    // set the browse_flag
    if (NPT_FAILED(action->SetArgumentValue("BrowseFlag", browse_metadata?"BrowseMetadata":"BrowseDirectChildren"))) {
        return NPT_ERROR_INVALID_PARAMETERS;
    }
 
    // set the Filter
    if (NPT_FAILED(action->SetArgumentValue("Filter", filter))) {
        return NPT_ERROR_INVALID_PARAMETERS;
    }

    // set the Starting Index
    if (NPT_FAILED(action->SetArgumentValue("StartingIndex", NPT_String::FromInteger(start_index)))) {
        return NPT_ERROR_INVALID_PARAMETERS;
    }

    // set the Requested Count
    if (NPT_FAILED(action->SetArgumentValue("RequestedCount", NPT_String::FromInteger(count)))) {
        return NPT_ERROR_INVALID_PARAMETERS;
    }

    // set the Requested Count
    if (NPT_FAILED(action->SetArgumentValue("SortCriteria", sort_criteria))) {
        return NPT_ERROR_INVALID_PARAMETERS;
    }

    // invoke the action
    if (NPT_FAILED(m_CtrlPoint->InvokeAction(action, userdata))) {
        return NPT_ERROR_INVALID_PARAMETERS;
    }

    return NPT_SUCCESS;
}

/*----------------------------------------------------------------------
|   PLT_MediaController::Mute
+---------------------------------------------------------------------*/
NPT_Result 
PLT_MediaController::Mute(PLT_DeviceDataReference& device, 
                          NPT_UInt32               instance_id,
                          void*                    userdata)
{
    static int mute=0;
    PLT_ActionReference action;
    NPT_CHECK_SEVERE(CreateAction(device, 
        "urn:schemas-upnp-org:service:RenderingControl:1", 
        "SetMute", 
        action));
    mute = 1-mute;
    
    // Set the speed
    if (NPT_FAILED(action->SetArgumentValue("DesiredMute", mute==1?"1":"0"))) {
        return NPT_ERROR_INVALID_PARAMETERS;
    }
    
    return CallAVTransportAction(action, instance_id, userdata);
}

/*----------------------------------------------------------------------
|   PLT_FileMediaServer::OnBrowseDirectChildren
+---------------------------------------------------------------------*/
NPT_Result
PLT_FileMediaServer::OnBrowseDirectChildren(PLT_ActionReference& action, 
                                            const char*          object_id, 
                                            NPT_SocketInfo*      info /* = NULL */)
{
    /* locate the file from the object ID */
    NPT_String dir;
    if (NPT_FAILED(GetFilePath(object_id, dir))) {
        /* error */
        NPT_LOG_WARNING("PLT_FileMediaServer::OnBrowse - ObjectID not found.");
        action->SetError(701, "No Such Object.");
        return NPT_FAILURE;
    }

    /* retrieve the item type */
    NPT_DirectoryEntryInfo entry_info;
    NPT_Result res = NPT_DirectoryEntry::GetInfo(dir, entry_info);
    if (NPT_FAILED(res)) {
        /* Object does not exist */
        action->SetError(800, "Can't retrieve info " + dir);
        return NPT_FAILURE;
    }

    if (entry_info.type != NPT_DIRECTORY_TYPE) {
        /* error */
        NPT_LOG_WARNING("PLT_FileMediaServer::OnBrowse - BROWSEDIRECTCHILDREN not allowed on an item.");
        action->SetError(710, "item is not a container.");
        return NPT_FAILURE;
    }

    NPT_String filter;
    NPT_String startingInd;
    NPT_String reqCount;

    NPT_CHECK_SEVERE(action->GetArgumentValue("Filter", filter));
    NPT_CHECK_SEVERE(action->GetArgumentValue("StartingIndex", startingInd));
    NPT_CHECK_SEVERE(action->GetArgumentValue("RequestedCount", reqCount));   

    unsigned long start_index, req_count;
    if (NPT_FAILED(startingInd.ToInteger(start_index)) ||
        NPT_FAILED(reqCount.ToInteger(req_count))) {
        return NPT_FAILURE;
    }

    NPT_String path = dir;
    if (!path.EndsWith(m_DirDelimiter)) {
        path += m_DirDelimiter;
    }

    /* start iterating through the directory */
    NPT_Directory directory(path);
    NPT_String    entryName;
    res = directory.GetNextEntry(entryName);
    if (NPT_FAILED(res)) {
        NPT_LOG_WARNING_1("PLT_FileMediaServer::OnBrowseDirectChildren - failed to open dir %s", (const char*) path);
        return res;
    }

    unsigned long cur_index = 0;
    unsigned long num_returned = 0;
    unsigned long total_matches = 0;
    //unsigned long update_id = 0;
    NPT_String didl = didl_header;
    PLT_MediaObjectReference item;
    do {
        item = BuildFromFilePath(path + entryName, true, info);
        if (!item.IsNull()) {
            if ((cur_index >= start_index) && ((num_returned < req_count) || (req_count == 0))) {
                NPT_String tmp;
                NPT_CHECK_SEVERE(PLT_Didl::ToDidl(*item.AsPointer(), filter, tmp));

                didl += tmp;
                num_returned++;
            }
            cur_index++;
            total_matches++;        
        }
        res = directory.GetNextEntry(entryName);
    } while (NPT_SUCCEEDED(res));

    didl += didl_footer;

    NPT_CHECK_SEVERE(action->SetArgumentValue("Result", didl));

    NPT_CHECK_SEVERE(action->SetArgumentValue("NumberReturned", NPT_String::FromInteger(num_returned)));

    NPT_CHECK_SEVERE(action->SetArgumentValue("TotalMatches", NPT_String::FromInteger(total_matches)));

    NPT_CHECK_SEVERE(action->SetArgumentValue("UpdateId", "1"));

    return NPT_SUCCESS;
}

static JSBool SMJS_FUNCTION(upnp_service_call_action)
{
	GPAC_ActionUDTA *act_udta = NULL;
	char *action_name = NULL;
	SMJS_OBJ
	SMJS_ARGS
	GPAC_ServiceItem *service = (GPAC_ServiceItem *)SMJS_GET_PRIVATE(c, obj);
	if (!service || !argc || !JSVAL_IS_STRING(argv[0]) ) return JS_FALSE;

	action_name = SMJS_CHARS(c, argv[0]);
	PLT_ActionDesc* action_desc = service->m_service->FindActionDesc(action_name);
	SMJS_FREE(c, action_name);

	if (action_desc == NULL) return JS_FALSE;
	PLT_ActionReference action;

	NPT_CHECK_SEVERE(
	    service->m_device->m_pUPnP->m_pGenericController->m_CtrlPoint->CreateAction(
	        service->m_device->m_device,
	        service->m_service->GetServiceType(),
	        action_name,
	        action)
	);


	if ((argc>=2) && JSVAL_IS_OBJECT(argv[1])) {
		JSObject *list = JSVAL_TO_OBJECT(argv[1]);
		u32 i, count;
		JS_GetArrayLength(c, list, (jsuint*) &count);

		GF_LOG(GF_LOG_INFO, GF_LOG_NETWORK, ("[UPnP] Calling %s(", action_name));
		i=0;
		while (i+2<=count) {
			NPT_Result res;
			jsval an_arg;
			char *param_val, *_param_val = NULL;
			char szParamVal[1024];
			JS_GetElement(c, list, (jsint) i, &an_arg);
			char *param_name = SMJS_CHARS(c, an_arg);

			JS_GetElement(c, list, (jsint) i+1, &an_arg);

			param_val = (char*)"";
			if (JSVAL_IS_STRING(an_arg)) {
				param_val = _param_val = SMJS_CHARS(c, an_arg);
			} else if (JSVAL_IS_BOOLEAN(an_arg)) {
				param_val = (char *) ((JSVAL_TO_BOOLEAN(an_arg) == JS_TRUE) ? "true" : "false");
			}
			else if (JSVAL_IS_INT(argv[1])) {
				sprintf(szParamVal, "%d",  JSVAL_TO_INT(an_arg));
				param_val = szParamVal;
			}
			else if (JSVAL_IS_NUMBER(an_arg)) {
				jsdouble v;
				JS_ValueToNumber(c, an_arg, &v);
				sprintf(szParamVal, "%g", v);
				param_val = szParamVal;
			}

			if (!param_name || !param_val) res = NPT_FAILURE;
			else {
				GF_LOG(GF_LOG_INFO, GF_LOG_NETWORK, (" %s(%s)", param_name, param_val));
				res = action->SetArgumentValue(param_name, param_val);
			}
			SMJS_FREE(c, param_name);
			SMJS_FREE(c, _param_val);

			if (res != NPT_SUCCESS) return JS_FALSE;

			i+=2;
		}
		GF_LOG(GF_LOG_INFO, GF_LOG_NETWORK, (" )\n"));
	}

	if ((argc==3) && JSVAL_IS_OBJECT(argv[2])) {
		act_udta = new 	GPAC_ActionUDTA();
		act_udta->udta = argv[2];
		gf_js_add_root(c, &act_udta->udta, GF_JSGC_VAL);
	}
	service->m_device->m_pUPnP->m_pGenericController->m_CtrlPoint->InvokeAction(action, act_udta);
	return JS_TRUE;
}

/*----------------------------------------------------------------------
|   CMediaCrawler::OnBrowseRoot
+---------------------------------------------------------------------*/
NPT_Result
CMediaCrawler::OnBrowseRoot(PLT_ActionReference& action)
{
    NPT_String browseFlagValue;
    if (NPT_FAILED(action->GetArgumentValue("BrowseFlag", browseFlagValue))) {
        NPT_LOG_WARNING("PLT_FileMediaServer::OnBrowse - invalid arguments.");
        return NPT_FAILURE;
    }

    /* extract browseFlag */
    BrowseFlags browseFlag;
    if (NPT_FAILED(GetBrowseFlag(browseFlagValue, browseFlag))) {
        /* error */
        NPT_LOG_WARNING("PLT_FileMediaServer::OnBrowseRoot - BrowseFlag value not allowed.");
        action->SetError(402,"Invalid BrowseFlag arg.");
        return NPT_FAILURE;
    }

    if (browseFlag == BROWSEMETADATA) {
        PLT_MediaContainer item;
        item.m_Title = "Root";
        item.m_ParentID = "-1";
        item.m_ObjectID = "0";
        item.m_ChildrenCount = GetMediaServers().GetItemCount();
        item.m_ObjectClass.type = "object.container";

        /* convert item to didl */
        NPT_String filter;
        action->GetArgumentValue("Filter", filter);
        NPT_String tmp;
        NPT_CHECK_SEVERE(PLT_Didl::ToDidl(item, filter, tmp));

        /* add didl header and footer */
        NPT_String didl = didl_header + tmp + didl_footer;

        action->SetArgumentValue("Result", didl);
        action->SetArgumentValue("NumberReturned", "1");
        action->SetArgumentValue("TotalMatches", "1");

        // update ID may be wrong here, it should be the one of the container?
        action->SetArgumentValue("UpdateId", "1");
        // TODO: We need to keep track of the overall updateID of the CDS
    } else {
        NPT_String startingInd;
        NPT_String reqCount;
        NPT_String filter;

        NPT_CHECK_SEVERE(action->GetArgumentValue("StartingIndex", startingInd));
        NPT_CHECK_SEVERE(action->GetArgumentValue("RequestedCount", reqCount));   
        NPT_CHECK_SEVERE(action->GetArgumentValue("Filter", filter));

        unsigned long start_index, req_count;
        if (NPT_FAILED(startingInd.ToInteger(start_index)) ||
            NPT_FAILED(reqCount.ToInteger(req_count))) {
            return NPT_FAILURE;
        }   
                    
        unsigned long cur_index = 0;
        unsigned long num_returned = 0;
        unsigned long total_matches = 0;
        //unsigned long update_id = 0;
        PLT_MediaContainer item;
        NPT_String tmp;
        NPT_String didl = didl_header;

        // populate a list of containers (one container per known servers)
        const NPT_Lock<PLT_DeviceDataReferenceList>& devices = GetMediaServers();
        NPT_Lock<PLT_DeviceDataReferenceList>::Iterator entry = devices.GetFirstItem();
        while (entry) {
            PLT_DeviceDataReference device = (*entry);
            item.m_Title = device->GetFriendlyName();
            item.m_ObjectID = FormatObjectId(device->GetUUID(), "0");
            item.m_ParentID = "0";
            item.m_ObjectClass.type = "object.container";

            if ((cur_index >= start_index) && ((num_returned < req_count) || (req_count == 0))) {
                NPT_CHECK_SEVERE(PLT_Didl::ToDidl(item, filter, tmp));

                didl += tmp;
                num_returned++;
            }
            cur_index++;
            total_matches++;  

            ++entry;
        }

        didl += didl_footer;

        action->SetArgumentValue("Result", didl);
        action->SetArgumentValue("NumberReturned", NPT_String::FromInteger(num_returned));
        action->SetArgumentValue("TotalMatches", NPT_String::FromInteger(total_matches));
        action->SetArgumentValue("UpdateId", "1");
    }

    return NPT_SUCCESS;
}

/*----------------------------------------------------------------------
|   CMediaCrawler::OnBrowseDevice
+---------------------------------------------------------------------*/
NPT_Result
CMediaCrawler::OnBrowseDevice(PLT_ActionReference& action, 
                              const char*          server_uuid, 
                              const char*          server_object_id, 
                              NPT_SocketInfo*      info /* = NULL */)
{
    NPT_Result res;
    PLT_DeviceDataReference device;

    {
        // look for device first
        const NPT_Lock<PLT_DeviceDataReferenceList>& devices = GetMediaServers();
        //NPT_AutoLock lock(devices);

        if (NPT_FAILED(NPT_ContainerFind(devices, PLT_DeviceDataFinder(server_uuid), device))) {
            /* error */
            NPT_LOG_WARNING("CMediaCrawler::OnBrowseDevice - device not found.");
            action->SetError(701, "No Such Object.");
            return NPT_FAILURE;
        } 
    }

    // look for args and convert them
    NPT_String browseFlagValue;
    NPT_String startingInd;
    NPT_String reqCount;
    NPT_String filter;
    NPT_String sort;

    NPT_CHECK_SEVERE(action->GetArgumentValue("BrowseFlag", browseFlagValue));
    NPT_CHECK_SEVERE(action->GetArgumentValue("StartingIndex", startingInd));
    NPT_CHECK_SEVERE(action->GetArgumentValue("RequestedCount", reqCount));   
    NPT_CHECK_SEVERE(action->GetArgumentValue("Filter", filter));
    NPT_CHECK_SEVERE(action->GetArgumentValue("SortCriteria", sort));

    unsigned long start_index, req_count;
    if (NPT_FAILED(startingInd.ToInteger(start_index)) ||
        NPT_FAILED(reqCount.ToInteger(req_count))) {
        return NPT_FAILURE;
    } 

    // create a container for our result
    // this will be filled in by OnBrowseResponse
    CMediaCrawlerBrowseInfoReference browse_info(new CMediaCrawlerBrowseInfo());
    browse_info->shared_var.SetValue(0);

    // send off the browse packet.  Note that this will
    // not block.  The shared variable is used to block
    // until the response has been received.
    res = Browse(device,
        server_object_id,
        start_index,
        req_count,
        (browseFlagValue == "BrowseMetadata")?1:0,
        filter,
        sort,
        new CMediaCrawlerBrowseInfoReference(browse_info));		
    NPT_CHECK_SEVERE(res);

    // wait 30 secs for response
    res = browse_info->shared_var.WaitUntilEquals(1, 30000);
    NPT_CHECK_SEVERE(res);

    // did the browse fail?
    if (NPT_FAILED(browse_info->res)) {
        action->SetError(browse_info->code, "");
        return NPT_FAILURE;
    }    
   
    action->SetArgumentValue("Result", UpdateDidl(server_uuid, browse_info->didl, info));
    action->SetArgumentValue("NumberReturned", browse_info->nr);
    action->SetArgumentValue("TotalMatches", browse_info->tm);
    action->SetArgumentValue("UpdateId", browse_info->uid);
    action->SetArgumentValue("ObjectID", FormatObjectId(server_uuid, browse_info->object_id));
    
    return NPT_SUCCESS;
}