.Net CF下精确的计时器怎么使用

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.Net CF下精确的计时器

用法：

Dim t as New AtomicCF.Timert.start()....'Some functions hereDim TimeLapsed as Long = t.stop()

代码：

Imports System.Runtime.InteropServicesNamespace AtomicCFPublic Class Timer _Public Shared Function QueryPerformanceCounter(ByRef perfCounter As Long) As IntegerEnd Function _Public Shared Function QueryPerformanceFrequency(ByRef frequency As Long) As IntegerEnd FunctionPrivate m_frequency As Int64Private m_start As Int64Public Sub New()If QueryPerformanceFrequency(m_frequency) = 0 ThenThrow New ApplicationExceptionEnd If'Convert to ms.m_frequency = CLng(m_frequency / 1000)End SubPublic Sub Start()If QueryPerformanceCounter(m_start) = 0 ThenThrow New ApplicationExceptionEnd IfEnd 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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