Solved

Why would having a delay in the Timer1 code block greater then the Timer1 Interval case the Sendkeys to type slowly?

Posted on 2010-08-12
4
306 Views
Last Modified: 2012-05-10
I added a Timer from Toolbox with an Interval property of 1000.  

The code sends keystrokes to notepad.  If i place a sleep of less then 1000 it instantly prints the whole word out.

If increase the delay past 1000 it slowly types out one later at a time.

Private Sub Timer2_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer2.Tick
        System.Threading.Thread.Sleep(1250)
        Dim ps() As Process = Process.GetProcessesByName("notepad")
        If ps.Length > 0 Then

            Dim p As Process = ps(0)
            Dim hWnd As IntPtr = p.MainWindowHandle

            SetForegroundWindow(hWnd)
            System.Windows.Forms.SendKeys.SendWait("Experts Exchange")
            System.Windows.Forms.SendKeys.SendWait("{Enter}")
        End If
    End Sub

Open in new window


I guess I expected with the delay being greater then the timer interval it would print Experts Exchange once every 1250 milliseconds.

Not the output of the keys being printed in slow motion.
0
Comment
Question by:vaultworld
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
4 Comments
 
LVL 55

Assisted Solution

by:Huseyin KAHRAMAN
Huseyin KAHRAMAN earned 500 total points
ID: 33422835
on event, disable the timer
and enable at the end
Private Sub Timer2_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer2.Tick
  Timer2.enabled=false
  ...
  Timer2.enabled=true
End Sub

Open in new window

0
 
LVL 55

Accepted Solution

by:
Huseyin KAHRAMAN earned 500 total points
ID: 33422867
you are doing something wrong ;)
that timer triggers that code every second
and in the code you have some sleeps and some codes
after a while there will be multiple codes running at the same time making you confuse ;)
so, disable the timer, do your job, enable again

is this a one time job? if yes, then just disable at the beginning, so it will not run again...
0
 
LVL 1

Author Comment

by:vaultworld
ID: 33422935
I agree that is a viable solution.  But why the behavior?
0
 
LVL 86

Expert Comment

by:Mike Tomlinson
ID: 33423199
It's SendWait() vs. Send() that causes some of the funny behavior.

Try this:

    Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
        Debug.Print("Entered Tick()")
        System.Threading.Thread.Sleep(5000)
        Dim ps() As Process = Process.GetProcessesByName("notepad")
        If ps.Length > 0 Then

            Dim p As Process = ps(0)
            AppActivate(p.Id)

            Debug.Print("Sending EE")
            System.Windows.Forms.SendKeys.SendWait("Experts Exchange")
            Debug.Print("Sending Enter")
            System.Windows.Forms.SendKeys.SendWait("{Enter}")
        End If
    End Sub

Note that it NEVER gets to "Sending Enter".

Now change the two SendWait() calls to Send() and see what happens....
0

Featured Post

Online Training Solution

Drastically shorten your training time with WalkMe's advanced online training solution that Guides your trainees to action. Forget about retraining and skyrocket knowledge retention rates.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Article by: jpaulino
XML Literals are a great way to handle XML files and the community doesn’t use it as much as it should.  An XML Literal is like a String (http://msdn.microsoft.com/en-us/library/system.string.aspx) Literal, only instead of starting and ending with w…
A while ago, I was working on a Windows Forms application and I needed a special label control with reflection (glass) effect to show some titles in a stylish way. I've always enjoyed working with graphics, but it's never too clever to re-invent …
If you're a developer or IT admin, you’re probably tasked with managing multiple websites, servers, applications, and levels of security on a daily basis. While this can be extremely time consuming, it can also be frustrating when systems aren't wor…
In this video we outline the Physical Segments view of NetCrunch network monitor. By following this brief how-to video, you will be able to learn how NetCrunch visualizes your network, how granular is the information collected, as well as where to f…

717 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question