Register For Change Notification

The following sample code shows how to register for change notifications in the routing table. The topic "Use the Event Notification Callback" demonstrates how to utilize those change notifications.


#include <windows.h>
#include <stdio.h>
#include "Rtmv2.h"
#include "nldef.h"
#include <tchar.h>

// The following #defines are from routprot.h in the Platform Software Development Kit (SDK)
#define PROTO_TYPE_UCAST        0
#define PROTOCOL_ID(Type, VendorId, ProtocolId) (((Type & 0x03)<<30)|((VendorId & 0x3FFF)<<16)|(ProtocolId & 0xFFFF))
#define PROTO_VENDOR_ID        0xFFFF

// This is a simple callback method used by the new client registering for change notifications
void WINAPI Method(RTM_ENTITY_HANDLE CallerHandle, RTM_ENTITY_HANDLE CalleeHandle, RTM_ENTITY_METHOD_INPUT *Input, RTM_ENTITY_METHOD_OUTPUT *Output){
   
    UNREFERENCED_PARAMETER(CallerHandle);
    UNREFERENCED_PARAMETER(CalleeHandle);
    UNREFERENCED_PARAMETER(Input);
    UNREFERENCED_PARAMETER(Output);
 
    wprintf(L"Hello World!");
    return;
}

int __cdecl main(){

    RTM_ENTITY_HANDLE ThisClientHandle, OtherClientHandle;
    RTM_ENTITY_INFO EntityInfo;
    RTM_REGN_PROFILE RegnProfile;
    UINT NumMethods = 0;
    DWORD dwRet = ERROR_SUCCESS;
    RTM_ENTITY_EXPORT_METHODS Methods;
    PRTM_NOTIFY_HANDLE NotifyHandle = NULL;

    //------------------------------------------------------
    // Register a new client with an export method (callback)
    //------------------------------------------------------
    
    // Set the callback Method() as the exported client function
    Methods.NumMethods = 1;
    Methods.Methods[0] = (RTM_ENTITY_EXPORT_METHOD) Method;
    
    // Set the new client's properties
    EntityInfo.RtmInstanceId = 0;
    EntityInfo.AddressFamily = AF_INET;
    EntityInfo.EntityId.EntityProtocolId = PROTO_IP_RIP;
    EntityInfo.EntityId.EntityInstanceId = PROTOCOL_ID(PROTO_TYPE_UCAST, PROTO_VENDOR_ID, PROTO_IP_RIP);

    // Register the new client in the routing table manager
    dwRet = RtmRegisterEntity(&EntityInfo, &Methods, NULL, FALSE, &RegnProfile, &ThisClientHandle);
    if (dwRet != ERROR_SUCCESS){
        // RtmRegisterEntity failed
        // Do something here
        // clean-up
        return 0;
    }
    
    //------------------------------------------------------
    //  Register the new client for change notifications
    //------------------------------------------------------

    // Register for change notifications to the best routes to all destinations in the unicast view of the routing table.
    // For simplicity in this example, set the caller client handle to be the same as the callee client handle
    OtherClientHandle = ThisClientHandle;
    NotifyHandle = (PRTM_NOTIFY_HANDLE) HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(RTM_NOTIFY_HANDLE));
    dwRet = RtmRegisterForChangeNotification(ThisClientHandle, RTM_VIEW_MASK_UCAST, RTM_CHANGE_TYPE_BEST, OtherClientHandle, NotifyHandle);
    
    if (dwRet != ERROR_SUCCESS){
        // RtmRegisterForChangeNotification failed
        // Do something here
        // clean-up
        return 0;
    }

    // Clean-up: Deregister the new entity and free heap memory
    dwRet = RtmDeregisterFromChangeNotification(ThisClientHandle, *NotifyHandle);
    dwRet |= RtmDeregisterEntity(ThisClientHandle);
    if (dwRet != ERROR_SUCCESS){
        // Deregistration failed
        // Do something here
    }
    HeapFree(GetProcessHeap(), 0, NotifyHandle);

    return 0;
}


 

 

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