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Member 7815124 wrote: a Windows service ... it gives a message "System DateTime has been changed".
A Windows service cannot interact with the desktop, so it's not going to be able to display a message to the user. There might not even be a user logged in when the system time changes.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Thank you for your quick answer.
So what am I to do ? Creating a windows process that runs in background ? What should be the code ?
I have written something please check it.....
Public Class Form1
Dim iDate As DateTime = DateTime.Now
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Timer1.Interval = 1000
Timer1.Enabled = True
End Sub
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
Dim iDateNow As DateTime = DateTime.Now
If iDateNow <> iDate Then
MsgBox("Date Time Change Detected.")
End If
End Sub
End Class
Is the above code OK ? How should I run it like a process ?
modified 9-Jul-13 7:53am.
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That code is going to pop up a message every second. If you leave it running, it will fill your screen with messages, and eventually exhaust all system resources.
What are you actually trying to achieve?
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Ok, First I should tell you that I am not getting any message running this code(I do not know why? is it that I am not using a loop?).
Secondly and most important thing is I am trying to create something that detects System Date Time change and give a message to the user. This program will be connected to my main program i.e. if this program/process is closed then the main program will be closed automatically.
My main program contains a piece of code that writes install date, License period and last use date in the registry. If the user try to manipulate the system date and time my main program will not open (Although the idea or the code is not fullproof)
So I want to warn user through the detection of dateTime change that, to get back the last date time otherwise the program will not run.
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There is no reliable way to do this without using an external clock source, such as one on the Internet.
The only place I know of to get that the system time changed would be from the System Event Log. Still, even the event log can be cleared out without your code ever seeing the event.
Monitoring for it and watching the time contantly isn't going to do you any good. What if the system time changes when Windows isn't running??
The only way to do it would be to compare the current system time to an external reference and make a note of the offset. Every once in a while (while your code is running) you'll have to compare the current time to the external source again and see if the time is current, again, considering the offset you noted before, plus or minus a variance. PC clocks don't run at exactly the same speed and will drift over time.
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Simple to reroute using the host-file 
Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
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Even if you use the IP address?
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Thank you all for your quick answers. But I should inform you that I am not so much educated in vb.net like you all. Therefore believe me your answers are just like a Tangent for me.
Ok, let me state you my idea which i would like to implement
1. My process starts with windows (continuously checking the system date and time and matching.)
2. User starts main program (checks if the process is running.)
Somehow user understood and find that the process is responsible for date time checking. So he close the process from windows task manager.
3. My process close my main program before closing.
4. User wants to start main program. (Main program checks and found process is not running)
5. Main program will not run.
I tried to create the process and tried to close Microsoft Word with that but failed......
Imports System
Imports System.Diagnostics
Public Class Form1
Dim iDate As DateTime = DateTime.Now
Dim MyProcess() As Process = System.Diagnostics.Process.GetProcessesByName("winword")
Sub New()
InitializeComponent()
Timer1.Interval = 1000
Timer1.Enabled = True
Application.Run()
End Sub
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
Dim iDateNow As DateTime = DateTime.Now
If iDateNow < iDate Then
For Each p As Process In MyProcess
p.Kill()
Next
End If
End Sub
End Class
While I tried to close the process, Microsoft word was not closing.
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Biplob Singha Shee wrote: While I tried to close the process, Microsoft word was not closing.
You've not added any code to kill the process when your application exits. You'd need to do that from the Closing event of your form.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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I wrote the code to kill the process
For Each p As Process In MyProcess
p.Kill()
Next
and before that I declare the variable
Dim MyProcess() As Process = System.Diagnostics.Process.GetProcessesByName("winword")
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But in the code you posted, there is nothing which will run when the form is closed. The only time your p.Kill() code will execute is if the system time is changed to be earlier than the start time of your program.
The only time that will normally happen is when the computer transitions out of Daylight Saving Time, when the clocks go back by one hour. (Since that's not the issue you're trying to address, you should be using DateTime.UtcNow instead.)
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Sir, could you please help me on closing an application from another application.
I need some code idea.
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You just need to add the code to a handler for the Closing event of your form:
Private Sub FormClosing(ByVal sender As Object, ByVal e As FormClosingEventArgs) Handles MyBase.FormClosing
Dim MyProcess() As Process = Process.GetProcessesByName("winword")
For Each p As Process In MyProcess
p.Kill()
Next
End Sub
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Thank you very much. But I tried with this code. It is not closing Microsoft Word.
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The name of the process is "winword.exe", not "winword".
Oh! And your code is making the rather LARGE assumption that there will only be one instance of Word running, created by your application. That is simplly not going to be the case and you should NOT be blindly killing off every instance of Word you find.
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Your entire concept is flawed. You cannot reliably check to see if the time has been altered without using an external (on the Internet) time source.
And you really don't need two processes for this...
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I know my code is "FLAWED" but my concept is not wrong as because in my area everybody does not have internet connection or Internet connection is not available for everybody as everybody can not bear the cost of internet connection.
So I have to do it without internet connection (External resource of DateTime checking).
I again say my code is FLAWED and that is why I am asking a help from you people. I know you all are exparts.
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Again, there is NO WAY to check to see if the Date/Time has changed without an external time source. You can NOT do what you want without one.
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Thank you sir for your reply.
But I know one thing. THERE IS NOTHING IMPOSSIBLE IN THIS WORLD. I do not want to invent anything but I have to discover the solution of my problem.
But the problem is I DO NOT HAVE MORE KNOWLEDGE IN VB.NET.
Thank you again for your quick and kind reply.
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Biplob Singha Shee wrote: THERE IS NOTHING IMPOSSIBLE IN THIS WORLD
One, you're one THOSE. OK Mr. Smarty Pants. Lay flat on the ground and have a 6 ton African elephant stand directly on your chest for 10 minutes. Live to tell us about how it felt.
Biplob Singha Shee wrote: I have to discover the solution of my problem.
For the last time... Without a connection to an external time source, be it on the internet or a physically and properly secured server machine on the network that your client machine is connected to THERE IS NO WAY TO DETECT IF THE SYSTEM CLOCK IS NOT CORRECT.
Have a nice life.
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Ha ha ha ha 
Do you want to give me solution or wanna kill me ?? 
Actually I do not want to argue with you or this forum is not for the ARGUMENT. I just want to eat an apple but you are preventing me for cutting the apple tree. Oh boss why should I cut the tree ??? I can get it from the tree or if I cannot, I can easily get it from the market no ???
Important thing is how and which way a person implements his/her idea or concept. It is not that he/she should stroke his/her head with a hammer to get the real way.
I again say I do not want to argue with you as you are an expert and I am just a novice and I accept that. and NOTHING IS IMPOSSIBLE in terms of implementing the code.
If you have solution then please give me. If not I am requesting you please do not try to use abusive language. Please try to respect everybody as they are not actually hurting you... as YOU ARE AN EXPERT I am accepting..... and everybody will accept also, but that does not mean the others are less.
modified 9-Jul-13 13:48pm.
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Biplob Singha Shee wrote: NOTHING IS IMPOSSIBLE in terms of implementing the code.
Really? Outside of the code itself, just how are you going to RELIABLY determine if the clock has been rolled back without an external time source?
I guarantee that every method you come acrossed, that doesn't use an external time source, can be easily defeated.
You're looking for a solution that doesn't exist!
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Somewhere somebody told this type of negetive answer before human reaches moon.
Dave Kreskowiak wrote: I guarantee that every method you come acrossed, that doesn't use an external time source, can be easily defeated.
I know it can be defeated but not
Dave Kreskowiak wrote: easily
It is not that easy for everybody to defeat others.
I am confident because I have already implemented my concept (not windows process) of clock manipulation in visual basic 6.0 (without any external resource of DateTime) and I somewhat succeeded. Yes SOMEWHAT as I know (as I have already told some time ago) my code is not full-proof but my concept is not wrong. What is the wrong in it if I want to try At least ?
Dave Kreskowiak wrote: You're looking for a solution that doesn't exist!
One thing I would like to ask you.....
DO YOU KNOW EVERY PROCEDURE/SOLUTION ???
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Biplob Singha Shee wrote: One thing I would like to ask you.....
DO YOU KNOW EVERY <br />
PROCEDURE/SOLUTION ???
To this problem?? Yes.
And, yes, EASILY defeated. The ONLY methods to combat clock tampering that have any security at all all involve using an external time source.
The whole point behind doing this is protecting your application from people who "try" but never "buy". There are various levels of people who will steal your software. The "script kiddies" being at the bottom of the list and all-out "hackers" at the top. What you propose will stop the know-nothing "script kiddies" and that's about it. Get someone who know anything about what you're doing watching the clock and your code starts to fall very easily.
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