※ 引述《kenit (很閒的人)》之銘言：
: 小弟最近剛開始學用.NET 2003寫vb程式
: 一方面是興趣一方面是公事上的需要
: 我需要寫一個用ping的方式來確定公司的電腦
: 是不是有開機的程式
: 程式寫完之後很簡單
: 只用到了網路上的一個叫做pivo ping的元件
: 還有dataset和DataAdapter來讀取和更新資料庫
: 然後用while和thread.sleep()來讓它在固定的相隔時間
: 重複執行
: 程式碼全部加起來不到50行
: 可是執行的時候
: 卻需要花到30mb左右的記憶體
: 這還只是它在sleep的時候佔用的大小
: 似乎太誇張了點
: 於是小弟參考了網路上的建議
: 把沒必要的變數都捨去不用
: 在程式sleep的時候
: 把不用保留的變數和dataset的資源都釋放掉
: 可是執行時還是需要25mb左右的大小..orz
: 小弟想問一下
: .net的程式是不是都特別耗記憶體
: 小弟看我那開了五 六個分頁的firefox
: 不也才使用了30幾mb的記憶體
: 雖然現在記憶體動輒就是giga起跳的
: 可是這樣浪費記憶體也不是個辦法
: 希望各位前輩給小弟一些建議
: 感激不儘~
我只有VB6的範例,不知能否幫到你
'==========================================================================
Dim ECHO As ICMP_ECHO_REPLY
Dim pos As Long
Dim success As Long
If SocketsInitialize() Then
'ping the ip passing the address, text
'to send, and the ECHO structure.
success = Ping(("168.95.1.1"), ("1234567890123456"), ECHO)
'display the results
MSGBOX "網路反應時間：" & ECHO.RoundTripTime & " ms"
SocketsCleanup
Else
MsgBox "Windows Sockets for 32 bit Windows " & _
"environments is not successfully responding."
End IF
'以下程式在模組
Private Const IP_SUCCESS As Long = 0
Private Const IP_STATUS_BASE As Long = 11000
Private Const IP_BUF_TOO_SMALL As Long = (11000 + 1)
Private Const IP_DEST_NET_UNREACHABLE As Long = (11000 + 2)
Private Const IP_DEST_HOST_UNREACHABLE As Long = (11000 + 3)
Private Const IP_DEST_PROT_UNREACHABLE As Long = (11000 + 4)
Private Const IP_DEST_PORT_UNREACHABLE As Long = (11000 + 5)
Private Const IP_NO_RESOURCES As Long = (11000 + 6)
Private Const IP_BAD_OPTION As Long = (11000 + 7)
Private Const IP_HW_ERROR As Long = (11000 + 8)
Private Const IP_PACKET_TOO_BIG As Long = (11000 + 9)
Private Const IP_REQ_TIMED_OUT As Long = (11000 + 10)
Private Const IP_BAD_REQ As Long = (11000 + 11)
Private Const IP_BAD_ROUTE As Long = (11000 + 12)
Private Const IP_TTL_EXPIRED_TRANSIT As Long = (11000 + 13)
Private Const IP_TTL_EXPIRED_REASSEM As Long = (11000 + 14)
Private Const IP_PARAM_PROBLEM As Long = (11000 + 15)
Private Const IP_SOURCE_QUENCH As Long = (11000 + 16)
Private Const IP_OPTION_TOO_BIG As Long = (11000 + 17)
Private Const IP_BAD_DESTINATION As Long = (11000 + 18)
Private Const IP_ADDR_DELETED As Long = (11000 + 19)
Private Const IP_SPEC_MTU_CHANGE As Long = (11000 + 20)
Private Const IP_MTU_CHANGE As Long = (11000 + 21)
Private Const IP_UNLOAD As Long = (11000 + 22)
Private Const IP_ADDR_ADDED As Long = (11000 + 23)
Private Const IP_GENERAL_FAILURE As Long = (11000 + 50)
Private Const MAX_IP_STATUS As Long = (11000 + 50)
Private Const IP_PENDING As Long = (11000 + 255)
Private Const PING_TIMEOUT As Long = 500
Private Const WS_VERSION_REQD As Long = &H101
Private Const MIN_SOCKETS_REQD As Long = 1
Private Const SOCKET_ERROR As Long = -1
Private Const INADDR_NONE As Long = &HFFFFFFFF
Private Const MAX_WSADescription As Long = 256
Private Const MAX_WSASYSStatus As Long = 128
Private Type ICMP_OPTIONS
Ttl As Byte
Tos As Byte
Flags As Byte
OptionsSize As Byte
OptionsData As Long
End Type
Public Type ICMP_ECHO_REPLY
Address As Long 'Contains the replying IP address.
status As Long 'Contains the reply IP_STATUS
RoundTripTime As Long 'RTT in milliseconds.
DataSize As Long 'Contains the reply data size in bytes
Reserved As Integer 'Reserved for system use
DataPointer As Long 'Contains a pointer to the reply data
Options As ICMP_OPTIONS 'String containing reply options
Data As String * 250
End Type
Private Type WSADATA
wVersion As Integer
wHighVersion As Integer
szDescription(0 To MAX_WSADescription) As Byte
szSystemStatus(0 To MAX_WSASYSStatus) As Byte
wMaxSockets As Long
wMaxUDPDG As Long
dwVendorInfo As Long
End Type
Private Declare Function IcmpCreateFile Lib "icmp.dll" () As Long
Private Declare Function IcmpCloseHandle Lib "icmp.dll" _
(ByVal IcmpHandle As Long) As Long
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
Private Declare Function WSAGetLastError Lib "WSOCK32.DLL" () As Long
Private Declare Function WSAStartup Lib "WSOCK32.DLL" _
(ByVal wVersionRequired As Long, _
lpWSADATA As WSADATA) As Long
Private Declare Function WSACleanup Lib "WSOCK32.DLL" () As Long
Private Declare Function gethostname Lib "WSOCK32.DLL" _
(ByVal szHost As String, _
ByVal dwHostLen As Long) As Long
Private Declare Function gethostbyname Lib "WSOCK32.DLL" _
(ByVal szHost As String) As Long
Private Declare Sub CopyMemory Lib "kernel32" _
Alias "RtlMoveMemory" _
(xDest As Any, _
xSource As Any, _
ByVal nbytes As Long)
Private Declare Function inet_addr Lib "WSOCK32.DLL" _
(ByVal s As String) As Long
Public Function GetStatusCode(status As Long) As String
Dim msg As String
Select Case status
Case IP_SUCCESS: msg = "ip success"
Case INADDR_NONE: msg = "inet_addr: bad IP format"
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 Ping(sAddress As String, sDataToSend As String, ECHO As ICMP_ECHO_REPLY) As Long
'If Ping succeeds :
'.RoundTripTime = 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
'.Status will be 0
'
'If Ping fails .Status will be the error code
Dim hPort As Long
Dim dwAddress As Long
'convert the address into a long representation
dwAddress = inet_addr(sAddress)
'if a valid address..
If dwAddress <> INADDR_NONE Then
'open a port
hPort = IcmpCreateFile()
'and if successful,
If hPort Then
'ping it.
Call IcmpSendEcho(hPort, _
dwAddress, _
sDataToSend, _
Len(sDataToSend), _
0, _
ECHO, _
Len(ECHO), _
PING_TIMEOUT)
'return the status as ping succes and close
Ping = ECHO.status
Call IcmpCloseHandle(hPort)
End If
Else
'the address format was probably invalid
Ping = INADDR_NONE
End If
End Function
Public Sub SocketsCleanup()
If WSACleanup() <> 0 Then
MsgBox "Windows Sockets error occurred in Cleanup.", vbExclamation
End If
End Sub
Public Function SocketsInitialize() As Boolean
Dim WSAD As WSADATA
SocketsInitialize = WSAStartup(WS_VERSION_REQD, WSAD) = IP_SUCCESS
End Function
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