先 #include "cputicker.h" 後
就可使用
CCPUTicker()
operator=()
Measure()
GetTickCountAsSeconds()
GetTickCount()
GetCPUFrequency()
IsAvailable()
AssertValid()
Dump()
這些cputicker類別函式
Q:我的程式時間?
A:是指程式運行花費時間? 還是??
可以先用 CCPUTicker::IsAvailable 來看是否能使用這些函式 (RDTSC 高精度計數器)
接著用...
個人是用 VB 用過類似 API
PHP 語法:
'GetTickCount()
'Windows NT 3.5 及更高版本，精度為 10ms
'Windows NT 3.1 及更高版本，精度為 16ms
'Windows 95 及更高版本，精度為 55ms
'timeGetTime()
'精度約1ms , 此式適用於大多數應用場合
'1s = 1000ms = 1000000μs = 1000000000ns
'它傳回Windows啟動後到目前為止所經過的時間，傳回值以微秒為單位。
Public Declare Function GetTickCount Lib "kernel32" () As Long
Public Declare Function timeGetTime Lib "winmm.dll" () As Long
Public Type LARGE_INTEGER
lowpart As Long
highpart As Long
End Type
'得到處理器使用的主機板內部計時器的時鐘頻率
Private Declare Function QueryPerformanceFrequency Lib "kernel32" ( _
lpFrequency As Currency) As Long 'LARGE_INTEGER
Private Declare Function QueryPerformanceCounter Lib "kernel32" ( _
lpPerformanceCount As Currency) As Long 'LARGE_INTEGER
Public Function GetTickCount_MicroSec(Optional ByRef blnCountStart As Boolean)
Static TickCount1 As Currency
Dim TickCount2 As Currency
Dim Freq As Currency
If QueryPerformanceFrequency(Freq) Then
If blnCountStart Then
QueryPerformanceCounter TickCount1
GetTickCount_MicroSec = True
Else
QueryPerformanceCounter TickCount2
GetTickCount_MicroSec = (Abs(TickCount2 - TickCount1) / Freq) * 1000000 '10^6
End If
Else
'MsgBox "不支持高精度計數器!"
GetTickCount_MicroSec = False
End If
End Function
'**測試花費幾秒**
GetTickCount_MicroSec (True)
'我的運算式
Me.Caption = GetTickCount_MicroSec |
