更精確的計時 VB
一般使用Timer物件，沒有辦法精確的算到微秒，(每秒目更新18.2次)，若要算到微秒，則使用GetTickCount ，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。
Private Declare Function GetTickCount Lib "kernel32" Alias _
"GetTickCount" () As Long
Private CanContinue as Boolean
Private Sub Command1_click()
Dim i as Long
Dim j as Long
i = GetTickCount()
CanContinue = True
Do While CanContinue
j = GetTickCount()
if j - i > 50 Then
Debug.Print "已過50微秒"
i = j
End If
DoEvents
Loop
End Sub
Private Sub Command2_Click()
CanContinue = False
End Sub
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