SendARP - Visual FoxPro : Using Win32 (WinAPI) Functions


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	SendARP


	Code examples:

	Obtaining MAC address through Address Resolution Protocol (ARP) request

SendARP
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Sends an ARP request to obtain the physical address that corresponds to the specified destination IP address.

Code examples:


	Obtaining MAC address through Address Resolution Protocol (ARP) request

Declaration:

 
DWORD SendARP(
  IPAddr DestIP,
  IPAddr SrcIP,
  PULONG pMacAddr,
  PULONG PhyAddrLen
);

FoxPro declaration:

 
DECLARE INTEGER SendARP IN iphlpapi;
    INTEGER destIP,;
    INTEGER sourceIP,;
    STRING @pMacAddr,;
    INTEGER @PhyAddrLen

Parameters:

DestIP
[in] Destination IP address, in the form of an IPAddr structure.

SrcIP
[in] IP address of the sender, in the form of an IPAddr structure.

pMacAddr
[out] Pointer to an array of ULONG variables.

PhyAddrLen
[in, out] On input, specifies the maximum buffer size the user has set aside at pMacAddr to receive the MAC address, in bytes. On output, specifies the number of bytes written to pMacAddr.

Return value:

If the function succeeds, the return value is NO_ERROR (0).

My comment:

The ARP (Address Resolution Protocol) request attempts to obtain the physical address (MAC address) that corresponds to this IP address.

* * *
Dynamic Host Configuration Protocol (DHCP) FAQ

Christian Ehlscheid offered this code on UniversalThread as a solution for obtaining physical address for a given ip address:

? IpToMacAddress("192.168.1.0")

FUNCTION IpToMacAddress(lcIP)
        DECLARE INTEGER inet_addr IN ws2_32.dll STRING cIP
        DECLARE INTEGER SendARP IN iphlpapi.dll;
                INTEGER destIP, INTEGER sourceIP,;
                STRING @ pMacAddr, INTEGER @ PhyAddrLen
        LOCAL lnHr, lnIpAddr, lcMacAddr, lnLen
        lnIpAddr = inet_addr(lcIp)
        lcMacAddr = REPLICATE(CHR(0),6)
        lnLen = 6
        lnHr = SendARP(lnIpAddr,0,@lcMacAddr,@lnLen)
        RETURN BinaryToMac(lcMacAddr,lnLen)
ENDFUNC

FUNCTION BinaryToMac(lcMacAddr, lnLen)
        LOCAL lcMac, xj
        lcMac = ""
        FOR xj = 1 TO lnLen - 1
                lcMac = lcMac + RIGHT(TRANSFORM(ASC(;
                        SUBSTR(lcMacAddr,xj,1)),"@0"),2) + ":"
        ENDFOR
        lcMac = lcMac + RIGHT(TRANSFORM(ASC(;
                SUBSTR(lcMacAddr,lnLen,1)),"@0"),2)
        RETURN lcMac
ENDFUNC

The Address Resolution Protocol (ARP) is a protocol used by the Internet Protocol (IP) [RFC826], specifically IPv4, to map IP network addresses to the hardware addresses used by a data link protocol.

Word Index links for the SendARP :

Dynamic Host Configuration Protocol

hardware address

Address Resolution Protocol

destination IP address

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Created:	2006-02-24 08:38:52
Modified:	2006-07-07 09:52:37

Visited in last 7 days: 18


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