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Capture sub second response times in VB

I am writing a utility to use for performance testing. Does anyone know of a VB function I can invoke to capture sub second response times or a way that I can create my own. The standard now() function only returns the value of the system clock which does not break down the time futher than a second. Likewise the date functions do not support sub second time intervals either.

ASKER CERTIFIED SOLUTION

Anthony Perkins

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Toad224

Use Timer ... it gives it in times accurate lessa than a second by returning a single... ie. 82390.95

Good Luck.

Ryan Chong

I'm with Anthony, you can write you codes to test the time bypassed like this:

Private Declare Function GetTickCount Lib "kernel32" () As Long

Private Sub Command1_Click()
Dim strTime As Long, stpTime As Long
strTime = GetTickCount

'Do the process here
For i = 1 To 1000
DoEvents
Debug.Print i
Next i

'strTime returns time in miliseconds (1000 = 1 second)
strTime = GetTickCount - strTime

'Convert it to 2 decimal format
MsgBox Format$(strTime / 1000, "#.00")
End Sub

mcoop

I thought ticks are approx 18mS resolution... ? (i.e. backward compatible with the old DOS clock...)

Does anyone know the correct answer ??

Sorry ryancs - I just want to make sure for my own knowledge as well !

Toad224

Yea... but Timer is basically the VB way of doing it... like you would use MsgBox rather than the MessageBox Win API or like you would do text1.text = "" rather than SendDlgItemMessage or SendMessage w/ WM_SETTEXT Both ways work great, though

Good luck!

Crin

Hi,
When I developed profiler application for myself I used this:

Private Type SYSTEMTIME
wYear As Integer
wMonth As Integer
wDayOfWeek As Integer" & ProfSpecLine
wDay As Integer" & ProfSpecLine
wHour As Integer" & ProfSpecLine
wMinute As Integer" & ProfSpecLine
wSecond As Integer" & ProfSpecLine
wMilliseconds As Integer" & ProfSpecLine
End Type

Private Declare Sub GetSystemTime Lib ""kernel32"" (ByRef lpSystemTime As SYSTEMTIME)

After that you can do

Dim A as SYSTEMTIME
GetSystemTime A

and access A.wYear ... A.wMilliseconds.

Sincerely,
Crin

mkeysaer

ASKER

A lot of good answers. Thanks for the input everyone!