...
IP_ADAPTER_INFO* pAdptInfo = NULL;
ULONG            ulLen     = 0;
time_t           t1;
time_t           t2;
CWinErr          err;

err = GetAdaptersInfo(NULL, &ulLen); // call with NULL to get size required

// At this point ulLen==640 but the IP_ADAPTER_INFO I compiled is 648 bytes because
// the two time_t members, IP_ADAPTER_INFO::LeaseObtained and IP_ADAPTER_INFO::LeaseExpires
// are 8-byte each.

if (err == ERROR_BUFFER_OVERFLOW)
{
  // Adding the following assert helped us locate a problem
    // ASSERT(ulLen >= sizeof(IP_ADAPTER_INFO));

  pAdptInfo = (IP_ADAPTER_INFO*)malloc(ulLen);

  err = GetAdaptersInfo(pAdptInfo, &ulLen); // Iphlpapi.dll on 32 bit machine uses 4-byte time_t   
}

if (pAdptInfo && err == ERROR_SUCCESS)
{
  t1 = pAdptInfo->LeaseObtained;
  t2 = pAdptInfo->LeaseExpires;  // Craps out with access violation here because this
                                   // member is actually the last 8 bytes of the struct
                                   // which I haven't allocated in with my malloc call.
}
...

Labels: conversion, time, time_t

# posted by Daniel Rivera @ 4:10 p.m.