vb.net取网络时间的简单介绍
Vb.net 2008 如何获取网络时间
你是指Internet上的国际标准时间吗。
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先加入控件 AxWinsock1 在.Com中Microsoft.Winsock
Public Class Form1
Private Declare Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As Integer)
Dim NoSrv As Boolean
Dim TimeFromNet As String
Dim OldTime As Date
Dim NewTime As Date
Dim MyDate As Date
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
If AxWinsock1.CtlState MSWinsockLib.StateConstants.sckClosed Then AxWinsock1.Close()
AxWinsock1.Protocol = MSWinsockLib.ProtocolConstants.sckTCPProtocol
NetTime("") '首先取中科院国家授时中心时间
If NoSrv Or TimeFromNet = "" Then
NetTime("time.nist.gov") '取美国标准技时院时间
If NoSrv Or TimeFromNet = "" Then
MsgBox("检测不到网络标准时间服务器time.nist.gov！")
Else
NetTime("time.nist.gov")
If TimeFromNet = "" Then
MsgBox("网络标准时间服务器time.nist.gov超时！")
Else
MyDate = Mid(TimeFromNet, 8, 8)
OldTime = Mid(TimeFromNet, 17, 8)
NewTime = TimeSerial((Hour(OldTime) + 8) Mod 24, Minute(OldTime), Second(OldTime))
Dim MyTime As DateTime = MyDate Space(1) NewTime
MsgBox(MyTime)
'SetWindowsClock(MyTime)
End If
End If
Else
'使网络误差时间小，第2次再中科院国家授时中心时间
NetTime("")
If TimeFromNet = "" Then
MsgBox("网络标准时间服务器超时！")
Else
MyDate = Mid(TimeFromNet, 8, 8)
NewTime = Mid(TimeFromNet, 17, 8)
Dim MyTime As DateTime = MyDate Space(1) NewTime
MsgBox(MyTime)
'SetWindowsClock(MyTime)
End If
End If
End Sub
Private Sub NetTime(ByVal TimeSrv As String)
NoSrv = False
TimeFromNet = ""
If AxWinsock1.CtlState MSWinsockLib.StateConstants.sckClosed Then AxWinsock1.Close()
AxWinsock1.RemoteHost = TimeSrv ' "" 或 "time.nist.gov"
AxWinsock1.RemotePort = 13
AxWinsock1.LocalPort = 0
AxWinsock1.Connect()
Do While TimeFromNet = ""
If NoSrv Then Exit Do
Sleep(55)
System.Windows.Forms.Application.DoEvents()
Loop
If AxWinsock1.CtlState MSWinsockLib.StateConstants.sckClosed Then AxWinsock1.Close()
End Sub
Private Sub AxAxWinsock1_CloseEvent(ByVal sender As Object, ByVal e As System.EventArgs) Handles AxWinsock1.CloseEvent
AxWinsock1.Close()
End Sub
Private Sub AxAxWinsock1_DataArrival(ByVal sender As Object, ByVal e As AxMSWinsockLib.DMSWinsockControlEvents_DataArrivalEvent) Handles AxWinsock1.DataArrival
AxWinsock1.GetData(TimeFromNet)
End Sub
Private Sub AxAxWinsock1_Error(ByVal sender As Object, ByVal e As AxMSWinsockLib.DMSWinsockControlEvents_ErrorEvent) Handles AxWinsock1.Error
NoSrv = True
End Sub
End Class
vb。net怎么获取网络上的时间 坐等
Dim obj,OBJStatus As Object,url As String,GetText As String,i As Integer
Dim Retrieval
url=""
'判断网络是否连接
If url""Then
Retrieval=GetObject("winmgmts:\\.\root\cimv2")
obj=Retrieval.ExecQuery("Select*FromWin32_PingStatusWhereAddress='"Mid(url,8)"'")
For Each OBJStatus In obj
If IsNothing(OBJStatus.StatusCode) Or OBJStatus.StatusCode0 Then
Exit Sub
Else
Exit For'已连接则继续
End If
Next
End If
'通过下载网页头信息获取网络时间
Retrieval=CreateObject("Microsoft.XMLHTTP")
With Retrieval
.Open ( "Get",url,False,"","")
.setRequestHeader ("If-Modified-Since","0")
.setRequestHeader ("Cache-Control","no-cache")
.setRequestHeader ("Connection","close")
.Send()
If.Readystate4 Then Exit Sub
GetText=.getAllResponseHeaders()
i=InStr(1,GetText,"date:",vbTextCompare)
If i0 Then'网页下载成功
i=InStr(i,GetText,",",vbTextCompare)
GetText= Trim(Mid(GetText,i+1))
i=InStr(1,GetText,"GMT",vbTextCompare)
GetText=GetText.Substring(0,i-1)' Left(GetText,i-1)
MsgBox ("网络时间:"GetText)
End If
End With
Retrieval=Nothing
OBJStatus=Nothing
obj=Nothing
vb.net获取网络时间失败
是不是另一台电脑是vista 及以上版本的系统 ？
用管理员模式。试试
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