这篇文章主要讲解了“.Net CF下精确的计时器怎么使用”,文中的讲解内容简单清晰,易于学习与理解,下面请大家跟着小编的思路慢慢深入,一起来研究和学习“.Net CF下精确的计时器怎么使用”吧!
.Net CF下精确的计时器
用法:
Dim t as New AtomicCF.Timer t.start() ....'Some functions here Dim TimeLapsed as Long = t.stop()
代码:
Imports System.Runtime.InteropServices Namespace AtomicCF Public Class Timer <DllImport("coredll.dll", EntryPoint:="QueryPerformanceCounter")> _ Public Shared Function QueryPerformanceCounter(ByRef perfCounter As Long) As Integer End Function <DllImport("coredll.dll", EntryPoint:="QueryPerformanceFrequency")> _ Public Shared Function QueryPerformanceFrequency(ByRef frequency As Long) As Integer End Function Private m_frequency As Int64 Private m_start As Int64 Public Sub New() If QueryPerformanceFrequency(m_frequency) = 0 Then Throw New ApplicationException End If 'Convert to ms. m_frequency = CLng(m_frequency / 1000) End Sub Public Sub Start() If QueryPerformanceCounter(m_start) = 0 Then Throw New ApplicationException End If End Sub Public Function [Stop]() As Int64 Dim lStop As Int64 = 0 If QueryPerformanceCounter(lStop) = 0 Then Throw New ApplicationException End If Return CLng((lStop - m_start) / m_frequency) End Function End Class End Namespace
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