VB如何去判断某个IP是否能ping通？

VB如何去判断某个IP是否能ping通？然后返回一个结果能？不能？

用winsock
protocol=udp
port=7
用timer控件设置反应时间

'模块 public const ip_status_base = 11000 public const ip_success = 0 public const ip_buf_too_small = (11000 + 1) public const ip_dest_net_unreachable = (11000 + 2) public const ip_dest_host_unreachable = (11000 + 3) public const ip_dest_prot_unreachable = (11000 + 4) public const ip_dest_port_unreachable = (11000 + 5) public const ip_no_resources = (11000 + 6) public const ip_bad_option = (11000 + 7) public const ip_hw_error = (11000 + 8) public const ip_packet_too_big = (11000 + 9) public const ip_req_timed_out = (11000 + 10) public const ip_bad_req = (11000 + 11) public const ip_bad_route = (11000 + 12) public const ip_ttl_expired_transit = (11000 + 13) public const ip_ttl_expired_reassem = (11000 + 14) public const ip_param_problem = (11000 + 15) public const ip_source_quench = (11000 + 16) public const ip_option_too_big = (11000 + 17) public const ip_bad_destination = (11000 + 18) public const ip_addr_deleted = (11000 + 19) public const ip_spec_mtu_change = (11000 + 20) public const ip_mtu_change = (11000 + 21) public const ip_unload = (11000 + 22) public const ip_addr_added = (11000 + 23) public const ip_general_failure = (11000 + 50) public const max_ip_status = 11000 + 50 public const ip_pending = (11000 + 255) public const ping_timeout = 200 public const ws_version_reqd = &h101 public const ws_version_major = ws_version_reqd \ &h100 and &hff& public const ws_version_minor = ws_version_reqd and &hff& public const min_sockets_reqd = 1 public const socket_error = -1 public const max_wsadescription = 256 public const max_wsasysstatus = 128 public type icmp_options ttl as byte tos as byte flags as byte optionssize as byte optionsdata as long end type dim icmpopt as icmp_options public type icmp_echo_reply address as long status as long roundtriptime as long datasize as integer reserved as integer datapointer as long options as icmp_options data as string * 250 end type public type hostent hname as long haliases as long haddrtype as integer hlen as integer haddrlist as long end type public type wsadata wversion as integer whighversion as integer szdescription(0 to max_wsadescription) as byte szsystemstatus(0 to max_wsasysstatus) as byte wmaxsockets as integer wmaxudpdg as integer dwvendorinfo as long end type public declare function icmpcreatefile lib "icmp.dll" () as long public declare function icmpclosehandle lib "icmp.dll" (byval icmphandle as long) as long public declare function icmpsendecho lib "icmp.dll" (byval icmphandle as long, byval destinationaddress as long, byval requestdata as string, byval requestsize as integer, byval requestoptions as long, replybuffer as icmp_echo_reply, byval replysize as long, byval timeout as long) as long public declare function wsagetlasterror lib "wsock32.dll" () as long public declare function wsastartup lib "wsock32.dll" (byval wversionrequired as long, lpwsadata as wsadata) as long public declare function wsacleanup lib "wsock32.dll" () as long public declare function gethostname lib "wsock32.dll" (byval szhost as string, byval dwhostlen as long) as long public declare function gethostbyname lib "wsock32.dll" (byval szhost as string) as long public declare sub rtlmovememory lib "kernel32" (hpvdest as any, byval hpvsource as long, byval cbcopy as long) public function getstatuscode(status as long) as string dim msg as string select case status case ip_success: msg = "ip success" case ip_buf_too_small: msg = "ip buf too_small" case ip_dest_net_unreachable: msg = "ip dest net unreachable" case ip_dest_host_unreachable: msg = "ip dest host unreachable" case ip_dest_prot_unreachable: msg = "ip dest prot unreachable" case ip_dest_port_unreachable: msg = "ip dest port unreachable" case ip_no_resources: msg = "ip no resources" case ip_bad_option: msg = "ip bad option" case ip_hw_error: msg = "ip hw_error" case ip_packet_too_big: msg = "ip packet too_big" case ip_req_timed_out: msg = "ip req timed out" case ip_bad_req: msg = "ip bad req" case ip_bad_route: msg = "ip bad route" case ip_ttl_expired_transit: msg = "ip ttl expired transit" case ip_ttl_expired_reassem: msg = "ip ttl expired reassem" case ip_param_problem: msg = "ip param_problem" case ip_source_quench: msg = "ip source quench" case ip_option_too_big: msg = "ip option too_big" case ip_bad_destination: msg = "ip bad destination" case ip_addr_deleted: msg = "ip addr deleted" case ip_spec_mtu_change: msg = "ip spec mtu change" case ip_mtu_change: msg = "ip mtu_change" case ip_unload: msg = "ip unload" case ip_addr_added: msg = "ip addr added" case ip_general_failure: msg = "ip general failure" case ip_pending: msg = "ip pending" case ping_timeout: msg = "ping timeout" case else: msg = "unknown msg returned" end select getstatuscode = cstr(status) & " [ " & msg & " ]" end function public function hibyte(byval wparam as integer) hibyte = wparam \ &h1 and &hff& end function public function lobyte(byval wparam as integer) lobyte = wparam and &hff& end function public function ping(szaddress as string, echo as icmp_echo_reply) as long dim hport as long dim dwaddress as long dim sdatatosend as string dim iopt as long sdatatosend = "echo this" dwaddress = addressstringtolong(szaddress) hport = icmpcreatefile() if icmpsendecho(hport, dwaddress, sdatatosend, len(sdatatosend), 0, echo, len(echo), ping_timeout) then 'the ping succeeded, '.status will be 0 '.roundtriptime is the time in ms for the ping to complete, '.data is the data returned (null terminated) '.address is the ip address that actually replied '.datasize is the size of the string in .data ping = echo.roundtriptime else ping = echo.status * -1 end if call icmpclosehandle(hport) end function function addressstringtolong(byval tmp as string) as long dim i as integer dim parts(1 to 4) as string i = 0 'we have to extract each part of the '123.456.789.123 string, delimited by 'a period while instr(tmp, ".") > 0 i = i + 1 parts(i) = mid(tmp, 1, instr(tmp, ".") - 1) tmp = mid(tmp, instr(tmp, ".") + 1) wend i = i + 1 parts(i) = tmp if i <> 4 then addressstringtolong = 0 exit function end if 'build the long value out of the 'hex of the extracted strings addressstringtolong = val("&h" & right("00" & hex(parts(4)), 2) & _ right("00" & hex(parts(3)), 2) & _ right("00" & hex(parts(2)), 2) & _ right("00" & hex(parts(1)), 2)) end function public function socketscleanup() as boolean dim x as long x = wsacleanup() if x <> 0 then msgbox "windows sockets error " & trim$(str$(x)) & " occurred in cleanup.", vbexclamation socketscleanup = false else socketscleanup = true end if end function public function socketsinitialize() as boolean dim wsad as wsadata dim x as integer dim szlobyte as string, szhibyte as string, szbuf as string x = wsastartup(ws_version_reqd, wsad) if x <> 0 then msgbox "windows sockets for 32 bit windows " & "environments is not successfully responding." socketsinitialize = false exit function end if if lobyte(wsad.wversion) < ws_version_major or (lobyte(wsad.wversion) = ws_version_major and hibyte(wsad.wversion) < ws_version_minor) then szhibyte = trim$(str$(hibyte(wsad.wversion))) szlobyte = trim$(str$(lobyte(wsad.wversion))) szbuf = "windows sockets version " & szlobyte & "." & szhibyte szbuf = szbuf & " is not supported by windows " & "sockets for 32 bit windows environments." msgbox szbuf, vbexclamation socketsinitialize = false exit function end if if wsad.wmaxsockets < min_sockets_reqd then szbuf = "this application requires a minimum of " & trim$(str$(min_sockets_reqd)) & " supported sockets." msgbox szbuf, vbexclamation socketsinitialize = false exit function end if socketsinitialize = true end function '窗体 private sub command1_click() dim echo as icmp_echo_reply dim pos as integer call ping(text2.text, echo) text1(0) = getstatuscode(echo.status) text1(1) = echo.address text1(2) = echo.roundtriptime & " ms" text1(3) = echo.datasize & " bytes" if left$(echo.data, 1) <> chr$(0) then pos = instr(echo.data, chr$(0)) text1(4) = left$(echo.data, pos - 1) end if text1(5) = echo.datapointer end sub