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    <p>The <code>GetAdaptersInfo</code> function only returns the addresses of the adapters attached to the local computer. You should take a look to <a href="http://msdn.microsoft.com/es-es/library/windows/desktop/aa366358%28v=vs.85%29.aspx" rel="nofollow">SendARP</a>.</p> <p>EDIT: Try this:</p> <pre><code>void CmfcServerDlg::PrintMACFromIP(const CString &amp;selected_ip_adr) { DWORD dwRetVal; IPAddr DestIp = 0; IPAddr SrcIp = 0; /* default for src ip */ ULONG MacAddr[2]; /* for 6-byte hardware addresses */ ULONG PhysAddrLen = 6; /* default to length of six bytes */ char *SrcIpString = NULL; BYTE *bPhysAddr; DestIp = inet_addr(CT2A(selected_ip_adr)); memset(&amp;MacAddr, 0xff, sizeof (MacAddr)); dwRetVal = SendARP(DestIp, SrcIp, &amp;MacAddr, &amp;PhysAddrLen); if (dwRetVal == NO_ERROR) { bPhysAddr = (BYTE *) &amp; MacAddr; if (PhysAddrLen) { CString theMac; theMac.Format(_T("%.2X-%.2X-%.2X-%.2X-%.2X-%.2X"), (int) bPhysAddr[0], (int) bPhysAddr[1],(int) bPhysAddr[2],(int) bPhysAddr[3],(int) bPhysAddr[4], (int) bPhysAddr[5]); PrintMACaddress(theMac); } else printf ("Warning: SendArp completed successfully, but returned length=0\n"); } else { printf("Error: SendArp failed with error: %d", dwRetVal); switch (dwRetVal) { case ERROR_GEN_FAILURE: printf(" (ERROR_GEN_FAILURE)\n"); break; case ERROR_INVALID_PARAMETER: printf(" (ERROR_INVALID_PARAMETER)\n"); break; case ERROR_INVALID_USER_BUFFER: printf(" (ERROR_INVALID_USER_BUFFER)\n"); break; case ERROR_BAD_NET_NAME: printf(" (ERROR_GEN_FAILURE)\n"); break; case ERROR_BUFFER_OVERFLOW: printf(" (ERROR_BUFFER_OVERFLOW)\n"); break; case ERROR_NOT_FOUND: printf(" (ERROR_NOT_FOUND)\n"); break; default: printf("\n"); break; } } } void CmfcServerDlg::PrintMACaddress(CString&amp; strText) { m_ClientIdList.AddString(strText); } </code></pre>
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    1. POhow to find the MAC address of another computer (client server)?
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    1. POhow to find the MAC address of another computer (client server)?
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    1. COok so i replaced the GetAdaptersInfo with the SendARP function. is there anything else i need to change in my code? because nothing is happening right now when i click the ip address (the MAC address should appear in the 2nd listbox)
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      1. USLisa Collins
    2. COYou should check the value that `SendARP`returns. If it is `NO_ERROR`, you have to pass the value in the `pMacAddr`parameter that you passed to the `SendARP`function, to your `PrintMACAddress`function.
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    3. COsorry i'm kind of lost.. what do i need to change in the code i posted above?
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