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vb中获取系统当前的时间用函数 now() 就可以。另外还有相关的时间 date() time()
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now()获取系统当前日期和时间,如:2015-12-12 22:23:34
time()获取系统的时间,如:22:23:34不显示当前日期
date()获得系统的日期,如:2015-12-12
Private Sub Command1_Click()
MsgBox Now()
MsgBox Time()
MsgBox Date
End Sub
不需要控件就可以,用多线程的方式实现,在窗体上放一个Label和一个button按钮,代码如下:
Imports System.Threading
Public Class Form1
Dim Start As Double
Dim td As Thread
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Label1.Text = "00:00:00 000"
Button1.Text = "开始"
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
If Button1.Text = "开始" Then
Button1.Text = "结束"
Start = DateAndTime.Timer
td = New Thread(AddressOf fun1)
td.Start()
Else
Button1.Text = "开始"
td.Abort()
End If
End Sub
'定义一个线程
Private Sub fun1()
Dim elapsed As TimeSpan
Dim Dg_txt As New Dg(AddressOf txt)
Do
elapsed = TimeSpan.FromMilliseconds((DateAndTime.Timer - Start) * 1000)
Me.Invoke(Dg_txt, elapsed.ToString, Label1)
Thread.Sleep(100)
Loop
End Sub
'定义一个委托
Delegate Sub Dg(ByVal s As String, ByVal obj As Label)
Sub txt(ByVal s As String, ByVal obj As Label)
obj.Text = s
End Sub
End Class
定时器中处理
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Timer1.Interval = 10 '10毫秒刷新一次
Timer1.Start() '开启定时器
End Sub
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
Label1.Text = Now
End Sub
Dim b As Boolean = My.Computer.Network.Ping("192.168.1.1", 1000) '返回ping结果,true表示通,false表示不通,1000表示1000毫秒内返回结果
If b = True Then '指定时间内ping通
Shell("cmd /c ping 192.168.1.1 C:\time.txt") '在C盘time.txt文件中保存ping的结果
Else '超时
MsgBox("999") '弹出999提示
End If
dim a1 as timespan = dtEndTime -dtStartTime
dim a2 as integer = a1.TotalMilliseconds