Retrieving Information Using GetIpStatistics

The GetIpStatistics function fills a pointer to an MIB_IPSTATS structure with information about the current IP statistics associated with the system.

To use GetIpStatistics

1. Declare some variables that are needed.

   Declare a DWORD variable dwRetval that will be using for error checking function calls. Declare a pointer to an MIB_IPSTATS variable called pStats, and allocate memory for the structure. Check that memory could be allocated.

   MIB_IPSTATS  *pStats;
   DWORD        dwRetVal = 0;
   
   pStats = (MIB_IPSTATS*) malloc(sizeof(MIB_IPSTATS));
   
   if (pStats == NULL) {
       printf("Unable to allocate memory for MIB_IPSTATS\n");
   }
   

2. Call the GetIpStatistics function with the pStats parameter to retrieve IP statistics for the local computer. Check for errors and return the error value in the DWORD variable dwRetval. If an error occurs, the dwRetval variable can be used for more extensive error checking and reporting.

   dwRetVal = GetIpStatistics(pStats);
   if (dwRetVal != NO_ERROR) {
       printf("GetIpStatistics call failed with %d\n", dwRetVal);
   }
   

3. If the call to GetIpStatistics was successful, print out some of the data in the MIB_IPSTATS structure pointed to by the pStats parameter.

   printf("Number of interfaces:   %ld\n", pStats->dwNumIf);
   printf("Number of IP addresses: %ld\n", pStats->dwNumAddr);
   printf("Number of received datagrams:  %ld\n", pStats->dwInReceives);
   printf("NUmber of outgoing datagrams requested to transmit:  %ld\n", pStats->dwOutRequests);
   

4. Free the memory allocated for the MIB_IPSTATS structure pointed to by the pStats parameter. This should be done once the application no longer needs the data returned by the pStats parameter.

   if (pStats)
       free(pStats);
   

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