UI-threading An Easy Way To Fix It?
Jan 23, 2012
I am communicating with a USB-HID device. It will successfully complete hundreds of send-receive requests but occasionally get a Null Exception error.
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at the rxData.dataPacket(i) = element I will get a NullReference error every now and then. I could enclose it in a try/catch statement, but I'd like to fix the root problem if possible.This device is communicating to microcontrollers, and it is possible that they won't always give a value... but my feeling is this is some sort of UI threading issue. When debugging, even though there is a null exception, many times there actually does seem to be data in dataReceived.data.ToList(). Is there an easy way to place the whole data processing routine on a thread separate from the UI?Edit: Changed code to match answer and give more info on where it is used. Still get NullReferenceExceptions after about 1,000 completed send/receive requests to the HID device.
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Sep 19, 2010
I have always wondered about this and seen this among lots of programmers. Why is a VB programmer or VB code easily dismissed as too noobish and easy while the same does not apply to Python or Python code? After all, isn't Python as easy as VB is? And it does provide drag-n-drop GUI application building also. So why is it that VB is flamed and yet Python is not?
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Apr 15, 2012
I've been trying to play with DirectShow but it's getting on top of me and my question on here didn't answered so I'm thinking maybe I should go with a different approach. (DirectShow VB.net can't change recording format). <- Where as that 'works' I can't get it in the format I want it, and I don't really understand it so I'd obviousl like to go down the route of something I can get my head around.
I've googled till my fingers are raw trying to come up with an easy way to record video in my vb.net application, it doesn't have to be fancy, just a preview with a start record, stop record button, that's it.
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Feb 14, 2010
iam very keen to learn vb.net 2008 so please suggest me how to access world most and best free of cost reading material available on net for reference.and free best book available for vb.net 2008 on the net. there is any complete source code available for consideration.
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Jun 25, 2009
Lets say I have 30 text fields in a Frame on my form, and I want to set them all to disable (so users can't edit them).Is there an easy way to walk through those fields without having to create an array of text fields?
I.E., in ... VB 6, with an array of text fields, I can do something like this:
For i = 0 to 10
txtfield(x).enabled = true.
Next i
Is there something in VB.NET where I won't have to use an array of controls, something like this (assuming all txt fields are in a frame):
[Code]...
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Sep 27, 2011
I'm running stored procedure from asp.net front-end but it's quite long. What is the easy way on running that thing in the background? I mean if I close the browser, I still want my stored procedure to complete not just die. Also, I would like to perform other actions on the front-end while my procedure is running.
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May 22, 2009
Is there an easy way to encrypt things? Here is some code I got:
[code]...
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Nov 17, 2010
I have 2 datetime components in my application. [code] How do I do it? How do I get it so my 2 datetime controls display the current 24 hour time?
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May 2, 2012
Dim energybar As New Rectangle(9, 154, energy, 21)That is my new rectangle, now when I draw it e.Graphics.FillRectangle(Brushes.Blue, energybar)It says there is no width but the integer energy is = to 100...now, how do I fix this? It but be somewhat simple.
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Apr 20, 2009
I have been using what I think is a simplistic and easy way of reading and writing to/from the registry but whenever I look at code I keep seeing links to DLL's and constant decorations and lines and lines of code.[code]
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Oct 28, 2009
I saw another forum which discussed how to detect whether a LAN was connected, but I need to know whether my Internet connection from my ISP is up or not (I'm writing a program for day trading, so knowing if my internet connection is down is critical). I know I can simply open a browser in VB and browse to a site and see if it doesn't come back "page not found", but that involves a fair amount of overhead, and if the internet is down, it often takes many seconds to a minute to come back with "page not found". Is there some simple command that will quickly tell me that my internet connection is working? I'm using VB in VS 2008, and currently using XP although I plan to convert to Windows 7 in the next couple months.
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Jul 30, 2009
I want to have a one second pause after some code has run. During that pause, if a certain key is pressed, I want to do some action. Otherwise, I want the code to continue as normal. What would I use to replace the comments in the following code?
myTestCode()
' Wait one second and see if a given key was pressed.
' If specific key is pressed, then show messagebox (or whatever) asking user if we should cancel (whatever)
NextMethodToRun()
Yes, I know there are a number of ways, which is why I am looking for something that is fast and simple to use. I do not want a console window, some other form, etc. to appear. Just want to check if a key was pressed. The key (if pressed) should be pulled off the keyboard buffer.
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Aug 22, 2010
Dim lines As String = System.IO.File.ReadAllText("C:12345.txt")
Debug.Print(GetLineWithText(lines, "swf"))
[code].....
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Jun 8, 2011
After we finished make a project , we need to make setup file right ? is the setup file contain all the component we use in our vb.net ? like Crystal Report component
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Feb 8, 2012
My app currently uses Interop.ADODB.dll to retrieve data from an access database.My compiled setup file has to include a Interop.ADODB.dll file for the software to work.What would i have to do in order to convert my app to drop the interop file by using Ado.net instead?Would it simply be a matter of changing the references and connection strings or does it involve alot more than that?
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Feb 19, 2011
I want to create a document, nice and easy like a word , or a rapport in access and .just it is easy to layout and so on.
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Dec 24, 2009
Ran across a snippet a while back but can't seem to find it again. Was very short and simple and detected all versions using version major and minor.
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Mar 30, 2011
I use this code given by .paul
Dim ms As New IO.MemoryStream
PIS.PictureBox3.Image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg)
dsNewRow.Item("picture") = ms.ToArray
[code]......
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Dec 21, 2009
I am brand new to VB2008 from VB6.I am trying to connect to my remote mySQL db and simply display a record into a label.Here's what I have on Form Load.[code]
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Dec 8, 2010
I have founfd numerous ones on the net, but they all only do these complicated RegEx for zip codes, html, address, credit card numbers, etc etc,All I want to accomplish is when the user searches for "commend", they get only every occurence of the word "commend". NOT commendeth, or commends, or some other variation.[code]
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Nov 11, 2011
I have an error while using a collection that has been stumping me for years.I wrote a class to allow users to write equations in a txt file using RPN (stack based notation).The class runs through a select statement while reading the equation and then ends up with a final number as the answer. I have a collection to place these objects in for easy reference. For whatever reason I get random object reference not set to an instance of an object errors when there is nothing in the program that would remove objects from the collection, kill objects, or change the collection in any way. It is possible for one thread to call the calculate function while another thread calls the CurrentValue property. I'm not sure if this could be causing the error, but once it happens I get an error every time the program enters that code until I run out of memory.
[Code]...
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Aug 24, 2009
I need to develop a simple radio message logging app for use on a small military exercise.Now, the app is quite simple in itself, it needs to let me easily submit a new message report simply containing "from", "to", "message", "category" (and timedate, etc). Now the problem is that I have no experience with programming anything up against a database. I know basic SQL but I just dont know how to work with databases programatically. What kind of local SQL database solution works best with vb.net and Visual studio? Maybe I should use an Access database instead?When I click submit (on a new message report) how can I make an entry in a local SQL database of some sort? How can I load up a list of the message log entries already made in a listview or something?
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Jul 26, 2011
I'm trying to find a simple and easy encryption/decryption method for strings. The strings will contain spaces, special characters, numbers, and letters. I just need to be able to encrypt/decrypt them.
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Jul 2, 2009
I have a VB.NET web app that is about 2000 lines of code, contains about 20 different subroutines, and about 50 different functions.Is there an easy way to "rewrite" this to take advantage of classes and objects?
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Aug 2, 2011
I have a variable defined as follows:Dim iRows As List(Of String())I've also been converting that to a list of lists just to make it easier to work with.Dim iRows As List(Of IList(Of String))I would like to bind that list to a GridView using the contents of the nested array/list to dynamically define the columns. I don't know ahead of time how many columns there will be, but I do know that they are all the same throughout the list.
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Nov 1, 2009
I need to create a application that will allow me to connect to remote computers and find out the os like w2k or xp so i can run the right scripts for that os.be able to input add an ip or computer name and pass it all scripts like bat, vba and psexec.
I would like to be able to put all util files and scripts in a single dir and have the selected from 2 or 3 differant dropboxs ie... bat's in one droplist and vba's in an other dropbox ect...
have preselected buttons to perform basic function:
1. who is logged on
2. what OS and service pack info
3. connect with netmeeting or remote desk top
4. run a remote command on remote desktop IE.. open with my user account a CMD, Control Panel, Explorer, Explore Network Connections.
have the app ping the pc first to verify connectivity, then execute the script or bat.
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Jun 8, 2010
I've got an ASP.net file, and I'm trying to include dynamic code which was easy in classic ASP. Here is what I have tried so far:
[Code]...
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Feb 2, 2010
I just created an idle lockout screen for my software (it's financial software, so if the program is inactive for 5 minutes, the login screen appears again).My question is... is there an easy way to hide all the other windows in my program that may be open? So let's say they are in frmData, and they have the dlgOptions screen open, with the dlgOptions_SelectItems dialog open from dlgOptions. There are 2 dialogs open on top of frmData. And, they are all opened with .ShowDialog().So, let's say they have that many windows open, and then leave there computer for 10 minutes. After 5 minutes, the login screen appears. But all that other stuff is in the background.Is there an easy way to "hide" all the other open windows, and just show the login screen, and then once login returns DialogResult.Yes, then show the forms/dialogs again? I could do this by delcaring instances of each form in a main module and doing it this way. But that sounds like a pain in the butt. Also, I don't know If I could hide frmMain while a dialog is open from it.
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Oct 5, 2011
I have an application which is strictly numeric input only, for everything in the main form, call it X in this post.
I want every single control that can handle input in X to only accept numeric entries, I have a way of doing this but it requires me to put a tonne of arguments for the handle, I tried to change this to handle any .KeyPress event on MyBase or Me (X) but it won't work.
Code that works but requires 1 000 arguments:
Private Sub numeric_keys_only(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles msTEXT.KeyPress, ssText.KeyPress etc...
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I have tinkered with the latter, specifying things like all the controls in a certain group box and it doesn't work.
I know the sub header has to be changed - I have changed it in my tests, that is just the example code. When I change everything it runs, just doesn't do anything.
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May 24, 2011
I have a question about which technology is more efficient and easy to use oracle forms or .net . The database we use is oracle now we have to develope a new project insurance software (application) . I just want your opinion if .net would be more better to use for these kind of projects and if it has the same performance with oracle database as the oracle forms?
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