I have a class that wraps up a few methods (e.g. OpenPort, SendMessage etc.). Some of the methods accept a number of parameters and return a value (e.g. SendMessage accepts port and a string that is the message to be sent and returns true or false depending on whether the mesage was sent successfully or not). I create an instance of my class when my form loads and I call the various methods throughout the lifetime of the app.In my SendMessage method there is actually a few steps that involves a delay as I send commands to an instrument and wait for a response. I'm using the AutoResetEvent class to synchronize things. Whilst this works ok I've noted that the UI is unresponsive during the wait period.
Public Class MyClass
Private _receiveNow As AutoResetEvent
Public Function OpenPort(ByVal portName As String, _
If NewEntryName.Text = "" And OpenFileDialog1.FileName = Nothing Then MsgBox("Please choose a name for your game.", vbExclamation) MsgBox("Please find your game.", vbExclamation) Else Button1.Text = NewEntryName.Text
Is it possible to have code running in the background and still be able to use other parts of the program (i.e. firing other events).For example I have a instant messaging chat in my program and when the user has a new message then the display flashes from green to red as seen below
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But I still want to be able to continue using the other functions in my program despite having this code running in the background (which highlights to the user that he has a new instant message by changing the display background colour)How can I overcome this?
Is it possible to run my application in the background so there is no minimised window on the bottom bar and, if possible, so an icon appears in the taskbar? If so, how would I do it?
I have an application where some data is stored automatically to Excel. However during the storage of data, the Excel spreadsheet is visible to the user. I need to know if there is any way to make the Excel run at the background.
I am trying to write up a program that has a few forms that you interact with and do various things with but I also need to have a TCP/IP client/server running in the background to handle a automated connection to a PLC. Is there anyway to have the TCP connection open and receiving/sending in the background even when the operator is doing something else?
I am working on a project and i have come to designing my splash screen... i dont want a useless one what just shows a loading bar what does nothing, im trying to make it useful and show while the main form is loading however this is proving to be a pain in the backside.. i can make the splash screen load when the exe is executed then close when the form is ready but i want to add an animation to the form (just a moving logo) this is just done by me running an timer what changes the location at each tick.. i can get it to work well on its own but when i add frmMain.show() to the code to load the program the animation will not work... i only get this when i ask the program to load the main form..
I m developing an application in vb 2008, and using background worker to copy file(s). I have my own designed form which plays an animationon on the top of the form along with copy. For playing animation i m using "AxMSComCtl2.AxAnimation", on execution i get
"ActiveX control '' cannot be instantiated because the current thread is not in a single-threaded apartment." On search i found a link :Forum Link
But still in this link Firstly i dont understand where to insert this snippet and secondly how to implement the idea on background worker.
the user of my application is able to run a diagnostic tool which is part of my application. This diagnostic tool searches every file on the computer, logs the names, and if the my program is able to then the file will be read.
My program has other uses as well. If the user wants to do something else in my program then i want the diagnostic code to run in the background. I don't want this code to prevent users from using other features of my application since the diagnostic search does take time.
How do i do this? Threading? A background worker? If the anwser is Threading which i am pretty sure it is, how do i set up a thread? My computer has 4 GB of RAM - 2GB & 2GB so i know i am able to do this smoothly.
Is it possible to start an application not being visible? This application is a batch application and my application would look way better if I could hide this batch.
What I'm trying to do is show a form while a background process is running. Similar to a progress bar but not a progress bar. We have a form that has an animated gif (customer request) and that's it. no other controls. They want this form to show while the processing in the background is running.
I have an app that runs from a network share/UNC path.i.e.\\networkserver\inventory\_application\systeminventory.exe.inside the app I call a 3rd party tool and run it from a subdirectory of the app. \\networkserver\inventory\_application\3rdparty\tool\tool.exe hide the window, and pull the output to a Text field.When I run the application local it runs great, it even calls the 3rd party tool from the UNC path and functions.But when I run the application from the UNC path and try to use the 3rd party tool it fails.I'm figuring it's cause the CMD prompt tries to kick off from the UNC path, and UNC paths are not supported as current paths. i.e. you can't do a "CD \\networkserver\inventory\". [code]
i've the need to close an ffmpeg conversion started in background with the vb.net process.start.I've seen that an ffmpeg could be closed by hitting the key 'q'.How can i send the 'q' key to the running ffmpeg process?
i intercept the process with this code:
Dim pProcess() As Process = Process.GetProcesses For Each p As Process In pProcess If p.ProcessName = "ffmpeg" Then
So I have this in my coding: vb file = My.Computer.FileSystem.OpenTextFileWriter("c:command.bat", False) file.WriteLine("@echo off") file.WriteLine("cd " & TextBox2.Text) file.WriteLine("adb shell dumpsys meminfo " & TextBox1.Text & " > C:Sample.txt") file.Close() Shell("C:command.bat")
What I want it to do is to run the batch file without it opening if that makes sense. Right now this runs on a loop for 10 minutes and on every 2 second tick it opens and then closes the .bat. Which is really annoying to see a .bat open and close every two seconds. Is there anyway to get this process to run silently in the background so the user doesnt even know that it is running?
I created a background thread that get's data and returns it to the main thread; this works. Now I want to be able to stop the SQL request from the main thread (probably on a button click). This is my test code for creating the thread (working):
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How can I access the background thread to stop the query on demand? Do I need to set a flag on the main thread telling the background thread to stop running then have the background thread poll the main thread at intervals? I was trying to look for an example but I wasn't able to find a good one.
I think it's because I have a background image. For example when I maximize the program it lags. I mean big software companies have programs that have more pixel images and are much more colorful then my program is but never lag why. AVG has nice look but the program never lag. But the code runs fine so that is a good thing. How can I stop the lag with background image?
Is it possible to make a program, that can set passwords on folders if it is running in the background? If now I open I my schoolprojectfolder, there will come a box, where you must type in a username and password. If the username or password is wrong, det folder wont open?
I have a per-call WCF service that serves a number of clients. I'm looking to speed up the services by running some background processes so they don't block or slow down the main function of the services.
One example is that the main function needs to return a set of data, while the background thread needs to record some statistics based on the parameter(s).
Code:
Public Function GetAccountDetails(id As Integer) As AccountDetails Dim retVal As New AccountDetails Dim a As New Accounts
[Code]....
If I use this background thread to record the statistic it doesn't block the main thread from returning the data to the client.
It's been working well in test scenarios, but my question is, are there any dangers with leaving this thread to execute without Joining it before returning the data to the client? Could there potentially be any loss of statistic data? Could there be potential memory problems on the server side?
I have a Class called SocketSvr which handles an asynchronous socket server. It is called via the BackgroundWorker from my main form. Basically, I just want it to display my socket data information inside a textbox in the main form, and have a server start/stop button available on the main form to do those things.
Here is the code from Form1.vb:
Public Class Form1 Dim WithEvents Socketsvr As New SocketSvr Private Sub ToggleServerButton_Click(ByVal sender As System.Object, _
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I am uncertain how to properly shut down requests from the client when the StopServer() function is run. In the code above, I place a cancellation queue for the background process. The funny thing is that once StopServer() is run, it will accept one more connection, then stop accepting thereafter.If I remove the following line from the code above:
-- it crashes when I attempt to start the server a second time (complaining that I cannot reuse the socket, obviously) My guess is that I need to add something to the bw.CancellationPending call on the background worker?
By using the code below i was able to open the folder and highlight the file that I wanted.The only problem is that I had multiple Explorer.exe's in my task manager.o my question is How can I open a folder and select the file within without Running a new explorer process? or Highlight a file in a folder that is already been opened previously
I have a spreadsheet that contains details of change requests; one row per request. This information needs to be copied into a Word form for sending off to our customer who then completes the response section. To speed up this process I have written some code that utilises the mail merge feature of Word and merges the relevant info from the spreadsheet into a Word form. This runs from Excel when a button is pressed.The problem comes when I go to save the workbook and exit Excel; it stays running in the background as a process in task manager.
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I'm fairly sure it has something to do with the merge code itself but my knowledge of VB is enough to grasp what is happening but not why it is happening. If I open the Word doc that has the merge fields in it, then open the spreadsheet that houses the info Excel says the workbook is already open.
I know the propertys transparency key and opacity. It isnt what I am looking for. I need to have my form to have the same Glass Effect the as win7 does while runing under win7 plataform. Like, if i have glass effect in the top I should have it in the background.
I am using query from a SQLite database as the AutocompleteCustomSource for a ComboBox. Also, I want to load data in separate thread. My LoadData method works fine when called directly, but it fails when it is called from the BackgroundWorker thread. When it is called from the background thread, it throws a Specified cast is not valid exception on the csearch.AutoCompleteCustomSource.Add(hh("Taj")) line. Below is my code:
Sub LoadData() Dim connetionString As String Dim cnn As SQLiteConnection
