Using Win32 functions in Visual FoxPro Image Gallery
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How to ping a remote site using ICMP API calls

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Before you begin:
The Ping class presents several API functions -- IcmpCreateFile, IcmpCloseHandle, IcmpSendEcho and others -- that used to send an ICMP Echo request and get a reply (RTT, round-trip time).

This is interesting, the same set of ICMP functions may exist in two libraries, ICMP.DLL and IPHLPAPI.DLL, on WinXP/2K computer.

See also:
  • How to ping a remote site using IP Helper API calls
  • How to retrieve adapter information for the local computer (including MAC address)
  • Obtaining addresses for the adapters on the local computer (Win XP/2003/Vista)
  • Using NetWkstaTransportEnum to obtain MAC Address of remote server

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    4122 bytes  
    Created: 2005-04-12 11:53:00  
    Modified: 2011-12-10 09:20:22  
    Visits in 7 days: 56  
    Listed functions:
    gethostbyname
    GlobalSize
    IcmpCloseHandle
    IcmpCreateFile
    IcmpSendEcho
    inet_ntoa
    WSACleanup
    WSAStartup
    Printer friendly API declarations
    My comment:
    The ICMP, Internet Control Message Protocol, an extension to the Internet Protocol that is generally used by PING utilities. This protocol is handy for generation of error messages, test packets, and informational messages related to IP.

    It is different from TCP and UDP protocols by both the purpose and implementation. RFC792 defines the ICMP.
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    User Contributed Notes:
    JimW | 2010-12-13 15:59:56
    I think there is a small error in the ToString() method.

    For the first line of the method, rather than:

    IF .errorcode=0

    I think it should be:

    IF this.errorcode=0

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