How to ping an IP address with Visual Basic by using ICMP


This step-by-step article describes how to ping a remote Internet Protocol (IP) address by using Visual Basic 6.0 and the Icmp.dll file.

Use ICMP to ping in Visual Basic

  1. Start Microsoft Visual Basic 6.0.
  2. In the New Project dialog box, click Standard EXE, and then click Open. The Visual Basic Design Editor opens, and Form1 is loaded.
  3. To add a new module to this project, right-click Project1.vbp in Project Explorer, point to Add, and then click Module.
  4. In the Add Module dialog box, click Open. The Module1.bas module is added to the project and opens in the Code Editor window.
  5. At the top of the Code Editor window of Module1, add the following constants and function declaration:
    Option Explicit

    'Icmp constants converted from

    Private Const ICMP_SUCCESS As Long = 0
    Private Const ICMP_STATUS_BUFFER_TO_SMALL = 11001 'Buffer Too Small
    Private Const ICMP_STATUS_DESTINATION_NET_UNREACH = 11002 'Destination Net Unreachable
    Private Const ICMP_STATUS_DESTINATION_HOST_UNREACH = 11003 'Destination Host Unreachable
    Private Const ICMP_STATUS_DESTINATION_PROTOCOL_UNREACH = 11004 'Destination Protocol Unreachable
    Private Const ICMP_STATUS_DESTINATION_PORT_UNREACH = 11005 'Destination Port Unreachable
    Private Const ICMP_STATUS_NO_RESOURCE = 11006 'No Resources
    Private Const ICMP_STATUS_BAD_OPTION = 11007 'Bad Option
    Private Const ICMP_STATUS_HARDWARE_ERROR = 11008 'Hardware Error
    Private Const ICMP_STATUS_LARGE_PACKET = 11009 'Packet Too Big
    Private Const ICMP_STATUS_REQUEST_TIMED_OUT = 11010 'Request Timed Out
    Private Const ICMP_STATUS_BAD_REQUEST = 11011 'Bad Request
    Private Const ICMP_STATUS_BAD_ROUTE = 11012 'Bad Route
    Private Const ICMP_STATUS_TTL_EXPIRED_TRANSIT = 11013 'TimeToLive Expired Transit
    Private Const ICMP_STATUS_TTL_EXPIRED_REASSEMBLY = 11014 'TimeToLive Expired Reassembly
    Private Const ICMP_STATUS_PARAMETER = 11015 'Parameter Problem
    Private Const ICMP_STATUS_SOURCE_QUENCH = 11016 'Source Quench
    Private Const ICMP_STATUS_OPTION_TOO_BIG = 11017 'Option Too Big
    Private Const ICMP_STATUS_BAD_DESTINATION = 11018 'Bad Destination
    Private Const ICMP_STATUS_NEGOTIATING_IPSEC = 11032 'Negotiating IPSEC
    Private Const ICMP_STATUS_GENERAL_FAILURE = 11050 'General Failure

    Public Const WINSOCK_ERROR = "Windows Sockets not responding correctly."
    Public Const INADDR_NONE As Long = &HFFFFFFFF
    Public Const WSA_SUCCESS = 0
    Public Const WS_VERSION_REQD As Long = &H101

    'Clean up sockets.

    Private Declare Function WSACleanup Lib "WSOCK32.DLL" () As Long

    'Open the socket connection.
    Private Declare Function WSAStartup Lib "WSOCK32.DLL" (ByVal wVersionRequired As Long, lpWSADATA As WSADATA) As Long

    'Create a handle on which Internet Control Message Protocol (ICMP) requests can be issued.
    Private Declare Function IcmpCreateFile Lib "icmp.dll" () As Long

    'Convert a string that contains an (Ipv4) Internet Protocol dotted address into a correct address.
    Private Declare Function inet_addr Lib "WSOCK32.DLL" (ByVal cp As String) As Long

    'Close an Internet Control Message Protocol (ICMP) handle that IcmpCreateFile opens.

    Private Declare Function IcmpCloseHandle Lib "icmp.dll" (ByVal IcmpHandle As Long) As Long

    'Information about the Windows Sockets implementation
    Private Type WSADATA
    wVersion As Integer
    wHighVersion As Integer
    szDescription(0 To 256) As Byte
    szSystemStatus(0 To 128) As Byte
    iMaxSockets As Long
    iMaxUDPDG As Long
    lpVendorInfo As Long
    End Type

    'Send an Internet Control Message Protocol (ICMP) echo request, and then return one or more replies.
    Private Declare Function IcmpSendEcho Lib "icmp.dll" _
    (ByVal IcmpHandle As Long, _
    ByVal DestinationAddress As Long, _
    ByVal RequestData As String, _
    ByVal RequestSize As Long, _
    ByVal RequestOptions As Long, _
    ReplyBuffer As ICMP_ECHO_REPLY, _
    ByVal ReplySize As Long, _
    ByVal Timeout As Long) As Long

    'This structure describes the options that will be included in the header of an IP packet.
    Ttl As Byte
    Tos As Byte
    Flags As Byte
    OptionsSize As Byte
    OptionsData As Long
    End Type

    'This structure describes the data that is returned in response to an echo request.
    Public Type ICMP_ECHO_REPLY
    address As Long
    Status As Long
    RoundTripTime As Long
    DataSize As Long
    Reserved As Integer
    ptrData As Long
    Data As String * 250
    End Type

    '-- Ping a string representation of an IP address.
    ' -- Return a reply.
    ' -- Return long code.
    Public Function ping(sAddress As String, Reply As ICMP_ECHO_REPLY) As Long

    Dim hIcmp As Long
    Dim lAddress As Long
    Dim lTimeOut As Long
    Dim StringToSend As String

    'Short string of data to send
    StringToSend = "hello"

    'ICMP (ping) timeout
    lTimeOut = 1000 'ms

    'Convert string address to a long representation.
    lAddress = inet_addr(sAddress)

    If (lAddress <> -1) And (lAddress <> 0) Then

    'Create the handle for ICMP requests.
    hIcmp = IcmpCreateFile()

    If hIcmp Then
    'Ping the destination IP address.
    Call IcmpSendEcho(hIcmp, lAddress, StringToSend, Len(StringToSend), 0, Reply, Len(Reply), lTimeOut)

    'Reply status
    ping = Reply.Status

    'Close the Icmp handle.
    IcmpCloseHandle hIcmp
    Debug.Print "failure opening icmp handle."
    ping = -1
    End If
    ping = -1
    End If

    End Function

    'Clean up the sockets.
    Public Sub SocketsCleanup()


    End Sub

    'Get the sockets ready.
    Public Function SocketsInitialize() As Boolean


    SocketsInitialize = WSAStartup(WS_VERSION_REQD, WSAD) = ICMP_SUCCESS

    End Function

    'Convert the ping response to a message that you can read easily from constants.
    'For more information about these constants, visit the following Microsoft Web site:

    Public Function EvaluatePingResponse(PingResponse As Long) As String

    Select Case PingResponse

    Case ICMP_SUCCESS: EvaluatePingResponse = "Success!"

    'Some error occurred
    Case ICMP_STATUS_BUFFER_TO_SMALL: EvaluatePingResponse = "Buffer Too Small"
    Case ICMP_STATUS_DESTINATION_NET_UNREACH: EvaluatePingResponse = "Destination Net Unreachable"
    Case ICMP_STATUS_DESTINATION_HOST_UNREACH: EvaluatePingResponse = "Destination Host Unreachable"
    Case ICMP_STATUS_DESTINATION_PROTOCOL_UNREACH: EvaluatePingResponse = "Destination Protocol Unreachable"
    Case ICMP_STATUS_DESTINATION_PORT_UNREACH: EvaluatePingResponse = "Destination Port Unreachable"
    Case ICMP_STATUS_NO_RESOURCE: EvaluatePingResponse = "No Resources"
    Case ICMP_STATUS_BAD_OPTION: EvaluatePingResponse = "Bad Option"
    Case ICMP_STATUS_HARDWARE_ERROR: EvaluatePingResponse = "Hardware Error"
    Case ICMP_STATUS_LARGE_PACKET: EvaluatePingResponse = "Packet Too Big"
    Case ICMP_STATUS_REQUEST_TIMED_OUT: EvaluatePingResponse = "Request Timed Out"
    Case ICMP_STATUS_BAD_REQUEST: EvaluatePingResponse = "Bad Request"
    Case ICMP_STATUS_BAD_ROUTE: EvaluatePingResponse = "Bad Route"
    Case ICMP_STATUS_TTL_EXPIRED_TRANSIT: EvaluatePingResponse = "TimeToLive Expired Transit"
    Case ICMP_STATUS_TTL_EXPIRED_REASSEMBLY: EvaluatePingResponse = "TimeToLive Expired Reassembly"
    Case ICMP_STATUS_PARAMETER: EvaluatePingResponse = "Parameter Problem"
    Case ICMP_STATUS_SOURCE_QUENCH: EvaluatePingResponse = "Source Quench"
    Case ICMP_STATUS_OPTION_TOO_BIG: EvaluatePingResponse = "Option Too Big"
    Case ICMP_STATUS_BAD_DESTINATION: EvaluatePingResponse = "Bad Destination"
    Case ICMP_STATUS_NEGOTIATING_IPSEC: EvaluatePingResponse = "Negotiating IPSEC"
    Case ICMP_STATUS_GENERAL_FAILURE: EvaluatePingResponse = "General Failure"

    'Unknown error occurred
    Case Else: EvaluatePingResponse = "Unknown Response"

    End Select

    End Function
    Note Watch for line wrapping when you copy this code into your project. This code provides the functions to access the Icmp.dll file. See the inline comments for a description of the constants, the declarations, and the function calls.
  6. In Project Explorer, right-click Form1, and then click View Object. Form1 loads in the Designer window.
  7. Double-click the Form1 body. The Code Editor window opens with the following code:
    Private Sub Form_Load()

    End Sub
  8. Replace the code in the Form_Load method with the following code:
    Private Sub Form_Load()

    Dim Reply As ICMP_ECHO_REPLY
    Dim lngSuccess As Long
    Dim strIPAddress As String

    'Get the sockets ready.
    If SocketsInitialize() Then

    'Address to ping
    strIPAddress = ""

    'Ping the IP that is passing the address and get a reply.
    lngSuccess = ping(strIPAddress, Reply)

    'Display the results.
    Debug.Print "Address to Ping: " & strIPAddress
    Debug.Print "Raw ICMP code: " & lngSuccess
    Debug.Print "Ping Response Message : " & EvaluatePingResponse(lngSuccess)
    Debug.Print "Time : " & Reply.RoundTripTime & " ms"

    'Clean up the sockets.


    'Winsock error failure, initializing the sockets.
    Debug.Print WINSOCK_ERROR

    End If

    End Sub
  9. Locate the following lines of code:
        'Address to ping
    strIPAddress = ""
    Change the strIPAddress to an IP address you want to ping.
  10. To save the project and the files that are associated with the project, click Save Project on the File menu.
  11. Notice that the results of the code are written to the Immediate window. To verify that the Immediate window is open, click Immediate Window on the View menu.
  12. To test this code, press F5. The results are displayed in the Immediate window. The results are similar to the following results:

    Address to Ping:
    Raw ICMP code: 0
    Ping Response Message : Success!
    Time : 10 ms
Note To ping a domain name, you must first translate the domain name to an address.

For more information, click the following article number to view the article in the Microsoft Knowledge Base:

154512 SAMPLE: Winsock.exe getting HostAddress by using Windows Sockets


For more information, click the following article numbers to view the articles in the Microsoft Knowledge Base:

160215 How to obtain the host IP address by using Windows Sockets

154512 SAMPLE: Winsock.exe getting HostAddress by using Windows Sockets


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