Checking The Return Code Set By A Task / Thread / Process / Program?
Apr 16, 2010
A long time ago, on a PC far, far away from Windows, one MS-DOS program (the father) could run / execute / spawn another MS-DOS program (the son). When the son terminated, it could set a return code which could certainly be interrogated by an MS-DOS batch program or, I think, by any father program that invoked it (depending on the language in which that program was written). I have a small utilility which I want to invoke from my application, and, since that utility sets a return code, I would like to interrogate it in my application when the utility terminates. I've looked through the MSDN Library but could not find anything that seemed to cover this situation. Is there a way to do this in Visual Basic 2008 Express
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Sep 21, 2010
I wrote code for checking whether a particular process (Outlook.exe, in my case) is running or not. It is working fine when the Outlook window is open or minimized. But, when the Outlook is minimized to tray (which on the right side of taskbar), my code is not identifying the process.Could anyone please suggest me a way to get the process of Outlook (or any other program) that is minimized to tray?
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Jul 7, 2011
Is it possible to run a external program/process example notepad in thread of you vb application?
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Sep 2, 2010
My understanding is that thread.join will suspend the execution of code on the calling thread until the spawned thread finishes or is aborted...
With that in mind, I tried this:
For i = 1 to 50
threads = New Thread(AddressOf test)
threads.IsBackground = True
threads.SetApartmentState(ApartmentState.STA)
[CODE]...
However, the rest of the code runs when the loop finishes, not waiting for all the spawned threads to finish. Since the rest of the code needs the threads to finish (otherwise the rest will error).
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Feb 20, 2011
I'm using webclient to download a webpage but obviously since it's on the UI thread it freezes.How can i change my class to be multi threaded using DownloadStringAsync? i can do this normally but since i am needing to return the information back to the UI thread i am a bit stuck
Public Class RequestExecutableInformation
Public Function FileReport(ByVal executable As String, ByVal ParameterStart As String, ByVal ParameterFinish As String) As String
Dim Source As String = String.Empty[code]...
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Nov 9, 2011
in my Winforms application, there is a main thread. It is not the UI thread but it starts the UI thread. In the main thread, I'm using a Mutex to prevent the application from being started twice. That's why I'm making an exception from the rule not to use a Thread's Join method. In this case, the main thread does call UIThread.Join before releasing the Mutex. That works well.
The strange problem is: Whenever an exception occurs in the UI thread, the default Windows error dialog pops (send report, debug, close). If I select "close", the application does not quit. Instead, the main window (created in the UI thread) stays visible, but it is inoperatable. It looks as if the UI thread still does not quit, and consequently the main thread's call to UIThread.Join doesn't return either.
Though, if I debug the application at that point, the "threads" window does not show the UI thread anymore. I've given it the name "UI Thread" (surprisingly).So, why does the Join method not return even if the thread has died? Why is a window of a died thread visible?The following screenshot shows the Threads window below and the window above shows the callstack of the main thread ("Hauptthread").
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Dec 28, 2010
I'm making a Visual Basic GUI application to display whether a number of my ports are open for people to know whether things like my website and my Minecraft server are open.My problem is I have absolutely no idea how to do this in Visual Basic.Basically, I'm asking for something which sends a signal to an IP with a specific port, if it is open then return true, if it's closed, return false. Similar to: http:[url]....
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Mar 23, 2011
I have an application that displays real time data. Queries are made to a MySQL database on another PC over the internet every 10 seconds to gather the most recent data.Originally I did the query within a BackgroundWorker so that the GUI is still responsive while the query is answered. However, I found that I need a timeout on the database query (as sometimes it hangs without generating an error) and couldn't do this within the background worker.
So now I'm trying to do it with threads. I have managed to run a thread to get the data.I need to understand how to run a task on the main thread when the GetDataThread is complete. If I do this using Events as shown below then Sub GetDataComplete is running as part of the GetDataThread not the Main Thread. I want to run a sub like backgroundWorker1_RunWorkerCompleted (this seems to run on the main thread).
My Main thread is called MainThread
VB
Imports System.Threading
Imports System.ComponentModel
[code]....
How can I run a task on the main thread when the GetDataThread is complete.
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Nov 6, 2010
How would i know when a thread is completed running it's task? I mean in background worker it has a completed event, but can i make something similar to that?
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May 27, 2009
i have use VB.Net 2005 for creating a application for Open new windows explorer by code and close this windows explorer when I close my application. I Open windows Explorer by this code.
[Code]...
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Feb 27, 2011
I want to get the name (image name on task manager) of the process that is active (foreground) and only when this process is foreground do something.
get the name of the foreground proces?
I already have this code
Dim procList() As Diagnostics.Process = Diagnostics.Process.GetProcesses()
Dim i As Integer
For i = 0 To 20 - 1 Step i + 1
[Code].....
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Aug 27, 2009
how do i check in vb if a file is already open / in use? and is it possible to hide a process from task manager?
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Feb 3, 2010
[code].....
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Nov 14, 2011
ve a simple vb code similar to the below,
Function getvalue (ByVal Val as double) As string
Dim Num as Integer
Dim Prd as double
[code].....
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Jun 13, 2012
What i want to achieve is run a exe installed in computer with changed name and also want to change process name as shown in task manager.
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Apr 22, 2009
How would I Make a program that would detect running process in the taskmanger:
Info on my program
+Like I want it to load the process name's in a Rich textbox or label or textbox (if that's possible XD).
+ And I will Have a Button that once I see all the process and then the button1 will kill the processes I Pick.
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Sep 23, 2008
I want to hide a game exe in task manager (win vista). I don't know how to do it,
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Jul 27, 2009
I want to hide my application process in task manager using C# how it possible.
my code is
[/b][code]
Imports System.Runtime.InteropServices
Imports System.Diagnostics
[Code]....
But when i click the button to hide the process it gives an[b] IndexOutOfRange Exception for the call
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Mar 22, 2012
I have a list of strings that I need to pass to a process in a different class. What I want to know which of the two ideas would be a better approach to use in terms of speed,efficiency and parallel processing. The list contains +- 10000 strings and I want to limit the threads appropriately to have only about 5threads running at one time:
For i as integer = 0 to searchPages.Count - 1
Parallel.For(0,10,Sub(x)
ps.processPage(searchPages.Item(i))
[code].....
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Jan 17, 2010
I just wonder if it is possible to simply check if the objectdatasource.select() returns any rows?e.g.
If ObjectDataSourceM.Select().GetEnumerator Is Nothing Then
'..
End If
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Apr 22, 2012
I'm having trouble checking the completion of multiple threads before executing more code.As an example, I started two threads:
**************************
Dim Thread1 As New System.Threading.Thread(AddressOf wordpress_checker_thread)
Thread1.Start()
[code].....
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Nov 1, 2010
In the code below, I open excel file, when I try to enter some values into excel cells, and close it afterwards. For some reasons excel process is still active in task manager. I am releasing objects, quiting application like for other excel files in my program, but in this specific example can't do this. The code below is written in Visual Studio 2010, windows 7.
Imports Microsoft.Office.Interop
Public Class Form1
Public MainPath As String = System.IO.Directory.GetCurrentDirectory()
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[Code] .....
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Jun 7, 2011
how do i get the full path of running process in task manager.
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Feb 15, 2012
When I go to Debug my program (F5), the program will load, until I click on the form with the main part of code in it, and then the program freezes, although it doesn't lock up because as soon as I press stop debugging/ task manager end process, it closes fine.
I will attach the zip of the program here. The form that it freezes on is "Black Ops". Edit Due to the forum not accepting my .Zip file (Invalid file type), I will upload it to MediaFire. Download link (445kb): Click Here
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Apr 14, 2009
gv1 is a grid !!
gv1.DataSource = minfo.Invoke(Activator.CreateInstance(classtype), inputParameterStore)gv1.DataBind()
What i get from minfo.invoke i am binding to the grid gv1 !!! But unfortunately its not working for all minfo !!!! Few errors are like :
return type is not IListSource ,IEnumerable or IDataSource !!!!
Hence i need to check if :
minfo.Invoke(Activator.CreateInstance(classtype), inputParameterStore)
returns IEnumerable or IData Source or IListSource !how to do that ?Also if return type is none of these i should display the result in a Textfield by Serializing the data and displaying it as an XML?How to do that too?
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Aug 27, 2009
I just need to check whether a process is running. But I have absolutely no idea where to start!
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Jun 27, 2010
I need to create a program that checks to see if a certain process is running, but I need to check it at a predetermined interval, such as every 10 seconds. I also need it to relaunch the program if it disappears/crashes. I have no idea where to start, I'm assuming I'd have to use a timer and write a method that checks for this process and then another method to simply launch it.
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Jul 24, 2010
I have an external (3rd party) EXE which I start from my app, which reads data from the user and creates a corresponding registry key with the information, then exits. I then need to read those registry values from my main application.
I start the app with:
Process.Start(My.Computer.FileSystem.SpecialDirectories.Temp & "GatherInfo.exe")
I need to read those registry values AFTER that EXE has quit - so I know they've been created. At the moment I'm just making my main app sleep after that process has been started:
System.Threading.Thread.Sleep(1000)
And then checking for the reg values. I'm worried this won't work for different users however, as the speed of the computer will determine how long the process takes to start and exit.
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Jun 8, 2011
i dont no much about vb.net ..i am php developer i have just developed a mini application in vb.net i wanted to know how to hide our application from appearing in task manager...
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Jun 23, 2011
When multithreading in VB, if you close the form while different threads are running, the process itself will not end. Is there a way I can force all threads to end, or end the process like in the Task Manager, when the form is closed?
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