a Problem about MAC address

You can use the Iphlpapi (GetAdaptersInfo/GetAdaptersAddresses):

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/iphlp/iphlp/ip_helper_functions.asp

As far as validation there is no API call that I know of that checks against known vendor blocks. I am sure though if you google you can find a DB listing all the Vendor addresses and the blocks assigned to them. I am also sure there are web sites that will allow you to plug in an address to determine the vendor of the MAC.

use SendArp( .. ) from iphlpapi. BUT you will see that there are no such headers (or functions ) in VC++ 6.0!
o, you might need this attachment (iphlpapi):

Hi

Here is some sample code, hope this helps with your understanding.

void GetMacAddress()
{
// Ensure buffer size is big enough to hold the address
TCHAR szBuffer[18];
DWORD dwSize = 18;

NCB ncb;
LANA_ENUM lenum;
UCHAR uMACAddress[6];
int i;
int iLEnumCnt = 1;
UCHAR uRASAdapterAddress[6] = { 0x44, 0x45, 0x53, 0x54, 0x0, 0x0 }; // DEST

::ZeroMemory(&ncb, sizeof(NCB));
::ZeroMemory(&lenum, sizeof(lenum));

// Helper function using GetVersionEx()
if(IsOSPlatformNT())
{
// NT or better supports adapter enumeration
ncb.ncb_command = NCBENUM;
ncb.ncb_buffer = (UCHAR *)&lenum;
ncb.ncb_length = sizeof(lenum);

UCHAR uRet = Netbios(&ncb);

if(uRet == NRC_GOODRET)
{
iLEnumCnt = (int)lenum.length;
}
}
else
{
// Can't do enumeration, so we'll pretend and query the first adapter only
lenum.length = (UCHAR)iLEnumCnt;

for(i=0; i<iLEnumCnt; ++i)
lenum.lana[i] = (UCHAR)i;
}

for(i = 0; i < iLEnumCnt; ++i)
{
if(ResetAdapter(lenum.lana[i]))
{
if (GetAdapterStatus(lenum.lana[i], uMACAddress))
{
// ignore RAS adapter address, we want MAC
if (memcmp(uMACAddress, uRASAdapterAddress, 6) != 0)
{
wsprintf(szBuffer, "%02X:%02X:%02X:%02X:%02X:%02X", (int)uMACAddress[0], (int)uMACAddress[1], (int)uMACAddress[2], (int)uMACAddress[3], (int)uMACAddress[4], (int)uMACAddress[5]);

}
}
}
}
}

tarantulaman, please accept my late thanks! :blush:
Until NOW,I found a new poster in my thread! :o
I run it at once,but some error happens:

error C2065: 'lNAME_SIZE' : undeclared identifier
error C2057: expected constant expression
error C2466: cannot allocate an array of constant size 0
error C2133: 'buffer' : unknown size
error C2065: 'IsOSPlatformNT' : undeclared identifier

so, lNAME_SIZE = ?
and, need I add some file to my project,so that it can find the "IsOSPlatformNT" function? :confused:
Thanks again! :)

Hello ILikeOrange,

Sorry about that, I should really have tested what I posted. :blush:

Anyway here goes, the missing bits are:

// ALSO Link to - netapi32.lib

const long lNAME_SIZE = 1024;

bool IsOSPlatformNT(void)
{
bool bWindowsMinNT = false;

DWORD dwMajorVersion;
DWORD dwMinorVersion;
DWORD dwPlatformID;

GetOSVersion(&dwPlatformID, &dwMajorVersion, &dwMinorVersion);

switch (dwPlatformID)
{
// Win 98/ME
case VER_PLATFORM_WIN32_WINDOWS:
{
bWindowsMinNT = false;
}
break;

// NT or better
case VER_PLATFORM_WIN32_NT:
{
bWindowsMinNT = true;
}
break;
}

return bWindowsMinNT;
}

bool GetOSVersion(LPDWORD dwPlatformID, LPDWORD dwMajorVersion, LPDWORD dwMinorVersion)
{
// Try calling GetVersionEx using the OSVERSIONINFOEX structure.
// If that fails, try using the OSVERSIONINFO structure.
OSVERSIONINFOEX osvi;
ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);

if(!GetVersionEx((OSVERSIONINFO*) &osvi))
{
// If OSVERSIONINFOEX doesn't work, try OSVERSIONINFO.
osvi.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);

if(!GetVersionEx((OSVERSIONINFO *)&osvi))
return false;
}

// Set the values
*dwMajorVersion = osvi.dwMajorVersion;
*dwMinorVersion = osvi.dwMinorVersion;
*dwPlatformID = osvi.dwPlatformId;

return true;
}


Hope this works now. ( I have now tested it and it seems to work, let me know if there are any more problems)

Dave