Sleep API From Kernel32 / Threads
Nov 10, 2010
I have a multi-threaded report engine application. I know that if I want to pause a thread for an interval I can use Thread.Sleep. What I need however, is to be able to suspend the entire process including all threads for a set period of time. In the past, I've used the Sleep API from kernel32.
It appears though that it's only "sleeping" my current thread and not the entire process which is not what I expected (now that I've read the documentation I realize that Thread.Sleep is probably the managed implementation of this API which is why it behaves as it does). So, my question, how do I force the entire application (and all of its threads) to pause the for the interval and not just the thread calling it? Private Declare Sub Sleep Lib "kernel32" (ByVal dwMilliseconds As Int32)
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May 25, 2010
Currently I'm using System.Threading.Thread.Sleep(5000) to let my app pause/sleep for some time. This works great but I can't open my app anymore when it's sleeping and it uses about 25% of my CPU. I guess there must be a better way to do this. I also tried using a timer but that didn't work out to well for me..
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Nov 7, 2010
coming from VB6 I've been using the windows API for many years. Now I'd lke to do the same on .NetMy question is, what would happen if I build for 'AnyCPU' and the application calls Kernel32 while running on a 64bit machine ?
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Jul 23, 2009
I want to migrate vb.net project onto linux platform using mono, but I am getting one problem system.dllnotfound exception: kernel32.I like to ask ,when does visual basic add this kernel32 dll. can I remove this kernel32 dll from my project?
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Oct 13, 2010
Looking at Microsoft's page on Wow64DisableWow64FsRedirection, I see some C code. What if you want to call this function and it's revert from VB.net? So far I have done this:
<Runtime.InteropServices.DllImport("KERNEL32.DLL", EntryPoint:="Wow64DisableWow64FsRedirection")> _
Public Shared Function DisableWow64Redirection() As Boolean
End Function
And I do likewise for the Revert brother function.This seems to work, as the shell command I call after actually finds its exe in system32, but I am not sure about the Revert, does it need a parameter? This Revert page seems to want me to take the output from disable and plug it into the revert call. Does that sound right? How do I change my DLLimport to take in a boolean and actually use it in the Kernal32.DLL function?
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Apr 28, 2012
This is the code I am working with...
[Code]...
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Oct 22, 2009
I get this during debug Unable to find an entry point named 'CloseHandleA' in DLL 'kernel32'.I get no compiling errors, I just get this Debug error :/
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Oct 19, 2011
I just had a new, last-minute idea on to take on a task, so I am running to StackExchange for quick help.
What I want to do is execute a series of methods right in a row, each in their own threads. I want the application to wait until all of these threads are completed, after which the program will resume. It also has to use managed threading (thread pool).
What quick examples could you provide to help me along the way? If it's too complex, what things should I know about so that I can Google it on my own?
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Dec 30, 2009
I have a main thread which is designed to be a batch processor - it spawns a series of 'child' threads from a loop (which can vary in terms of the no of items) - see below
[Code]...
However, each of the 'child' threads could take anywhere from milliseconds to about a minute to process - depending on the complexity of each calculation. There may also be a large number of child threads - e.g 100s. Creating large numbers of child threads is not efficient. I therefore want some way to effectively queue each child thread (and cancel if the process is taking too long to complete). Autoevents seems like one way of doing this, but the only examples I can find seem to assume there are two different processes on seperate threads, not one process being repeated.
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Nov 27, 2009
is there anyway to sleep a thread for a "tick". i.e. the tick in StopWatch.ElapsedTick. right now the best i could achieve is this thread.sleep(1). i need it faster
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Jul 11, 2010
I currently trying to write a simple visual basic 2008 code referring to:
[URL]
However, I getting an Error on: Dim wup As New WakeUPTimer.WakeUP
Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.Data
[Code].....
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Jul 27, 2009
i want to check if the computer is in sleep mode or not...Suppose my project is in normal state..I change the state to sleep mode,I want that now when the computer wakes from sleep mode,I want that my project is in minimized state..How to check dat?
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Jul 27, 2009
I want to check if the computer is in sleep mode or not...Suppose my project is in normal state..I change the state to sleep mode,I want that now when the computer wakes from sleep mode,I want that my project is in minimized state.[code]....
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Jul 29, 2009
I wanna sleep a second thread of BackgroundWorker. I tried to use Me.Dispatcher.Thread.Sleep(500) in DoWork event, but it fails.
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Aug 20, 2009
Is there a sleep method in vb.net(2003).
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Feb 8, 2010
I wish to prevent windows from going to sleep while my program is running.
I did allot of searching and found in MSDN the "SetThreadExecutionState" but could not find a way to make it work.
example code for preventing the sleep?
I am using windows 7 and vb 2008.
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Aug 22, 2011
Im having a problem with putting a thread to sleep...
othread.sleep(system.threading.timeout.indefinite)
The error is :"Access of shared member, constant member or enum member or nested type through an instance, qualifying expression will not be evaluated"
The code is:
Code:
Imports System.IO
Imports System.Threading
Public Class In_Process
[code].....
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May 20, 2009
I know there is always better ways of doing things. Normally when you create a thread and I want it to pause/sleep for a set amount of time I use the <Object>.Sleep(1000) but this is frowned upon in .Net2+.
[Code]...
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Jan 23, 2010
How can i wake up pc from sleep? i found this project [URL] in c# but i can not convert it, i tried but it has error, can someone conver this code in vb.net?
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Nov 1, 2011
I have a For..Each loop which loops trough all grid's rectangles and changes the fill of them randomly. I change the fill with a color animation. Here's my code:
Dim rand as new random
Dim changeColor As New Animation.ColorAnimation
changeColor.Duration = TimeSpan.FromSeconds(0.5)
[code]....
The problem is that the loop doesn't sleep. I want to trigger the animation, then wait until the rectangle fill is changed and then continue with the rest, but it seems that all of the rectangles fill are changed in the same time.
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Dec 20, 2009
Is there is way to delay loops without using (Sleep or timer) in VB
Because on java you cant do something like this
For(i = 0; i< 100; i++) {
Event.Wait(3000)
Animate(i);
}
I dont want to use sleep because your control is dead while is at sleep And using timer waste memory and process timer plus more coding is needed!
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Feb 18, 2011
I have an application that detects a Power mode change using.
SystemEvents.PowerModeChanged
if there is a way to detect if the system is going to sleep or hibernate?
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Sep 12, 2011
To start off with, I will say that I have tried ENDLESS attempts to surpress/capture/stop the actual sleep keystroke.
The code cannot require administrator privilege's. .
I tried:
Private Overrides Sub ProcessCmdKey, and Return true when the sleep key is pressed - did not disable sleep key LowLevelKeyboard - One that can disable the windows logo key - did not disable sleep key And many other keyhandling events, etc.
The code cannot create registry keys because that requires admin privilege's.
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May 5, 2012
[code]I send the Thread via Thread.Sleep to sleep mode when nothing happens here. Does this affect the TCPListener in his work somehow and what happens to an incomming connection while the Thread is in sleep-mode?
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Mar 31, 2011
I have a frm_Main, which starts a thread. The thread then goes and calls a module, which has a thread.sleep() in it. This causes the mouse to freeze up while it sleeps, despite being called by the child thread. I thought this would have be on the thread time-slice? However it is causing my form to freeze for the sleep duration.
[Code]...
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Apr 5, 2011
Ok so I have been playing with VB.net and brainstorming ways to accomplish launching a thread reliably every 60 seconds reguardless of how long the prior thread took to do it's work. Here is my question. Given the following code:
[Code]...
My assumption for this output would be that the time between each line would have to be exactly 5000 milliseconds plus the time it takes to execute the rest of the loop which could vary given that there could be an unknown delay due to disk IO. My problem is that looking at lines 10 and 11 and subtracting gives me a difference of 4,958 milliseconds. So my question is what the heck is going on there? How is it possible to get a difference of less than 5000 milliseconds when I have told the thread to sleep for 5000 milliseconds before completing the process. What am I missing?
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Mar 10, 2012
Is there a VB.NET code that I can use to make the computer sleep, restart, logoff, and maybe switch user too?
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Apr 26, 2009
I am trying to learn how to use Thread.Sleep properly as the main problem I am facing when using it is the fact that the window/form on run time would not move until after the sleep time has elapsed. Did I miss something? Below is a short example of what I want to achieve.
[Code]...
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Jan 4, 2011
"'I'm having an issue sorting out why my code isnt working. When I "step into" it line by line i can get it all to work exactly how I want, however when I actually run the macro i get an subscript error 9. The code basicly sets a .CSV url to a variable "CurrentURL". The code then launches this url which opens a .csv window called table.csv. I want to copy 2 columns off this window and paste it to another document called "MPT_CAPM_v1", then close table.csv. Here is my code the red line is where I believe I'm running into my error.'This macro opens a URL, copies and pastes the price data into the sheet
[Code]...
I think the error may be caused by the fact it takes about 4-5 seconds to open table.csv in excel, and my line of code is trying to select a window that isnt currently open. After I get the error message, table.csv opens up. I've tried Loops & Sleep functions to try to input a delay, but regardless it seems that table.csv will not open until the end of said loop or delay.
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May 31, 2011
Is there a simple sleep function in Visual Basic that doens't involve thread.
Something similiar like there exists in: C: sleep(1);
We also tried this code:Declare Sub Sleep Lib "kernel32" (ByVal milliseconds As Long)' pause for 5 seconds
Sleep 5000 but it didn't work. It gave me this error: PInvokeStackImbalance was detected
[Code]...
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