Timer Every Second Monitoring Windows Application Titles
Jul 1, 2011
I have a VB.NET desktop application that I'm using to monitor events in another windows application running on my system.I need to respond to certain events in a matter of seconds.One of the events I'm monitoring instantly changes the window title of a child window within the main process (I'm not changing it, the application I'm monitoring causes the change in it's own child window title).I have a function that uses windows API's to iterate through the title text of all the process's child windows, and I'm checking for certain values in the titles.Is it a bad idea to be running this timer/title check once every second? Are there performance issues associated with running a timer in windows every second 24/7? Is it also bad for performance to be calling the API's which retrieve the titles of all the application's child windows? Could I eventually cause that application to crash by sending requests to it so often?
I have a windows service application that runs a timer. When this timer ticks it starts another application that runs a process.The application is started but it does nothing. On the other hand if i run the application manually it works fine.
I need an accurate timer to interface a Windows application to a piece of lab equipment.I used System.Timers.Timer() to create a timer that ticks every 10 msec, but this clock runs slow. For example 1000 ticks with an interval of 10 msec should take 10 wall-clock seconds, but it actually takes more like 20 wall-clock sec (on my PC). I am guessing this is because System.Timers.Timer() is an interval timer that is reset every time it elapses. Since it will always take some time between when the timer elapses and when it is reset (to another 10msec) the clock will run slow. This probably fine if the interval is large (seconds or minutes) but unacceptable for very short intervals.Is there a function on Windows that will trigger a procedure every time the system clock crosses a 10 msec (or whatever) boundary?
UPDATE: System.Timers.Timer() is extremely inaccurate for small intervals.I wrote a simple program that counted 10 seconds several ways:
Interval=1, Count=10000, Run time = 160 sec, msec per interval=16 Interval=10, Count=1000, Run time = 16 sec, msec per interval=15 Interval=100, Count=100, Run time = 11 sec, msec per interval=110 Interval=1000, Count=10, Run time = 10 sec, msec per interval=1000
It seems like System.Timers.Timer() cannot tick faster that about 15 msec, regardless of the interval setting.Note that none of these tests seemed to use any measurable CPU time, so the limit is not the CPU, just a .net limitation (bug?)For now I think I can live with an inaccurate timer that triggers a routine every 15 msec or so and the routine gets an accurate system time. Kinda strange, but...I also found a shareware product ZylTimer.NET that claims to be a much more accurate .net timer (resolution of 1-2 msec). This may be what I need. If there is one product there are likely others.
I am looking for a bit of inspiration here, a client has requested me to build a simple remote process monitoring application with capability for smtp notification, when monitored processes go down or come back on-line. Can anyone point me in the direction of some sample code to get me started. I have briefly looked at .net remoting as a potential development path, from my understanding of how this works, the remoting architecture would require both a client and remote server component, (though I am not a 100% sure on this one), however if this is the case, then it will not fit the bill, as one of the fundamental requirements is that no additional software can be deployed on the servers which are to be monitored
I would to create an application that will allow me to monitoring in real-time the screen on a remote computer, I dont want to keylog, or control mouse,ot keyboard, just watch what they do at real-time.
I'm working on a web application called AssetCenter. I have 2 projects, one of them is the application (ACWEBNET) and the other is the web service (IMACWEBSVCS) that contains service related information.
I have written one application which communicate with one data logger unit (temperature monitoring unit) and download records after some interval. Unit continuously send current temperature which I have to show on screen and after each one hour I have to download log (all records saved inside unit at max 1024) from unit.
Now problem is after downloading log, application get hang or what we called working in background and resume after some time. If I pause debugger in visual studio 2008 it show control at application start (sub main) with message as "application will resume here after completing execution of current function". There is nothing in output window. So how can i trace is there any events got spool or what actually application doing in background.
I need to add a title to a graph? The code I run to create the graph is <strong>Dim strConn As String = connectionstring Dim conn As New SqlConnection(strConn) Dim sqlProducts As String = "SELECT * from VW_OEEBrakeDowns_ByYear where Year ='" & Me.lbyear.Text & "' and LineNumber =" & Me.lbline.Text & "" Dim da As New SqlDataAdapter(sqlProducts, conn [Code] .....
I have a .csv file which has data but not the column headers. I can able to create new .csv file with oldcsv file's content. But I need to add column headers in first row and from second row the existing data should appear.
Here is the code I have written: Dim ioFile As New System.IO.StreamReader("C:sample.csv") Dim ioLine As String Dim ioLines As String ioLine = ioFile.ReadLine ioLines = ioLine [Code] .....
Now I need to add column headers in new.csv as "ID","Name","Number","Amount".
I have created a Windows service in VS 2005 that monitors a folder for XML files, reads some data elements from the XML using XmlDocument, then copies the files to another location. I find that when I drop 2 or more XML files into the folder simultaneously, it processes them with no problems, but when I drop the same files into the folder one at a time, I will get an error on the second file: "The process cannot access the file <my file> because it is being used by another process." If I stop my service, restart it, and drop the second file into the folder again, it works the second time. I am confident that no other program is accessing this file at the same time as my service. My impression is that the processing of file # 1 is somehow not releasing all of the resources, leading to the processing of file # 2 mistakenly thinking that it can't access that second file.
Dim FileWatcher As New FileSystemWatcher() It points the watcher to my folder, sets up an event handler, then enables the watching: FileWatcher.Path = InputFolderPath
I have a datagrid, with two columns and two rows. The first row is the title of thecolumns, the second is the values. I want to compare the title of the row to a string value, and if it is the same subtract one from the second row value. If it is not the same, compare to the next column title...
Public Sub tickets_left() Night = "Hoodoo" For mm = 1 To 2 'ds.Tables("AddressBook").Columns.Count - 1
I am trying to get song titles from a pages source. There is no specific tag for these song titles, They are all nested like below
<h3><a href="/monosurround/all-night-long-monosurrounds-enfant-terrible-mix">All Night Long (Monosurround's "Enfant Terrible" Mix)</a></h3>
Now there are other <h3> tags so i need to do 2 loops so far.
First loop
<h3><a href="/monosurround/all-night-long-monosurrounds-enfant-terrible-mix">All Night Long (Monosurround's "Enfant Terrible" Mix)</a></h3> <h3><a href="/monosurround/monosurround-we">We</a></h3>
I want to use VB2010 make a timer to shutdown window.The shutdown command is [code]It worked properly if I am using Windows. But when I leaved for a while and Windows goes to the "screen saver". My program cannot shutdown the window. It seem the screen saver has more priority than my program.
Ok so im new to the forums and welcome any advice :)I am currently encoding my media library using handbrake and find that it places the encode number followed by a "-" before each title..I would like to remove the number and dash using VB..[code]
I want a list of folder names, i want a list of the names so i can remeber what projects i have on the go. so example,lets say i have 3 folders in my on my desktop and the names are A, B and C i want get a list of theose names so i remeber what projects i have created.
If you don't understand ill try to re word it more specific
I have been writing visual basic and vb .net applications for years and have come across this problem with the timer component under Windows 7 32bit on dual core Intel processors. This problem only occurs with Windows 7 running on a dual core processor, single core and under the virtual pc on any processor works.
I have attached a test program to show this problem. The program uses 2 timers to count down to 0. It does not matter what type of timer component I use system.timer.timer or system.windows.forms.timer. I read the system.timer.timer may fix this problem so I changed the program to use it but it did the exact same thing. Left it in anyway.
The program: Timer1 is set to a number of ms for a given amount of time say 150000 for 150 seconds and started. The timer will expire correctly. At the same time a second timer Timer2 is set to 1000 ms for a count down display to 0. Timer2 fires and the count is updated. This happens and everything looks fine. When Timer1 fires I disable timer2 so it will stop counting down. Timer2's countdown is at 2 instead of 0. It is firing slow. If I increase the value of timer1 to say 500 seconds timer2 is behind by 6 seconds. These amounts are the same for the 2 very different computers I ran this on but both are dual processor systems running Windows 7. The exact code works correctly on Windows Xp on the same processors and works under Windows 7 on a Pentium 4 system.
I have a timer running like a scoreboard countdown timer. Is there a way that I can display that same timer into two windows forms (winforms) without resorting to properties?
Right now I have a windows service which only task is to gather data from a database with a specific DSN and then send out an email if the data is valid. The service contains a timer which ticks every 5 minuts and performs the tasks above.Now I need to re-write the windows service to be able to run on more than 1 DSN.I was thinking of making several threads inside the windows service and then again have a seperat timer inside each thread.Is this a good idea and how can this be done? I want to avoid having a windows service for each DSN.[code]
Whatever project I'm making, I always encounter a problem with a Windows Forms Timer control, I guess I just make a little mistake somewhere... So I thought I'd post it here and hopefully someone here can explain what I'm doing wrong.
I'm trying to create a search textbox that will bring up titles as I type them. For instance, when I start typing D..all titles that begin with "D" will appear in drop down menu. I found a code that I believe does this but I'm getting error messages. The error message I am getting is: "cmbMovies not declared" and "CONN_STRING not declared". I created a DataSource named cmbMovies and it did not solve the problem. Am I looking at this correctly? Here is the
Imports System Imports System.Configuration Imports System.Data.SqlClient Public Class Form1
i'm relatively new to vb. I'm trying to make a relatively simple program to get all open window titles in a ListBox. I'm kinda borrowing off some tutorial's/sample code so I might have some declarations I don't need but this is what I have:
Code:Imports VB = Microsoft.VisualBasic Public Class Form1 Declare Function GetWindowTextLength Lib "user32" Alias "GetWindowTextLengthA" (ByVal hwnd As Integer) As Integer
I have a static HTML page, where im looking for a button that has a title of "Search" but i dont see an option to get the title of the current element during my loop
Dim theDivElementCollection2 As HtmlElementCollection = WebBrowser1.Document.GetElementsByTagName("button") For Each curElement2 As HtmlElement In theDivElementCollection2
In my Windows Form's application, I enable and start a Windows Form's Timer for a state machine which interacts with various User Controls. In one part of the state machine where an external device is being rebooted, I need to disable the User Interface (a User Control's UI) for the time it takes the device to reboot. The problem exists in that once I use System.Threading.Sleep, the timer that fires the State Machine stops and never restarts. I even re-enabled the Timer and re-started it after the Sleep command but to no avail. Is this expected operation or should a Windows Form's Timer be able to restart after a Sleep?
Snippet of code from a step in the state machine below: Cursor.Current = Cursors.WaitCursor MainForm.Enabled = False System.Threading.Thread.Sleep(8000) MainForm.Enabled = True Cursor.Current = Cursors.Default MainForm.t1.Enabled = True MainForm.t1.Start()
I'm writing a windows service and initially tried just using a regular System.Windows.Forms.Timer, but never saw it's tick event get fired in my debugger. From doing some research, it appeared that I needed to use the S ystem.Timers.Timer control instead. In order to make debugging easy, I set my timer interval to a really short value 1000 ms. I'm seeing some rather strange behavior, though. It appears that my timer control is creating multiple threads within my application, or is this just a bug in my debugger? I have an event handler for the Elapsed event like so:
[code]...
When I step through my code like this, it now appears to work as expected. Has anyone else run into this?
Wish you all are doing fine at the start of a new year
I am a beginner developer. I am developing a website. I have few divs which made up dragable boxes enhanced by jquery portlets. see the codes below.(html).
<div class="portlet"> <div class="portlet-header"> Category A </div> <div class="portlet-content">
[Code]....
I also have a stored procedure from the database developer that return the list of categories. Depending on the user selection, the list of categories can vary. So i have to dynamically create those Boxes. Each categories returned by the SP should replace Category A, Category B, and so on. As i can't know the number of categories returned by the SP i just hard coded those divs. My question is simply how ? How can i achieve this?
I have to be using VB.net in VS 2010. The database is in SQL server 2008.
