Using Sockets: App Crashing When Close Called After BeginRead?
Sep 16, 2010
I've made a small application which has a Form (Form1) and a Class (SocketClass). The Class holds the very basic kind of coding to connect to a server and download data. All communications are done through Sockets based on asynchronous methods.What I do is that when my application starts and I click the Connect button my form, it creates a new class (SocketClass) and creates a new socket and connects to server asynchronously. After a connection is made, it starts a loop that keeps monitoring for incoming data. I do that by calling BeginRead.
My application works perfectly. But there is one problem. When I try to disconnect the socket, it crashes my application. I've played around a lot with the code now, it appears that it crashes when a BeginRead is in progress. As per MSDN, I have to call ShutDown or Close to cancel a BeginRead and disconnect the connection. But even if I do that, it crashes my application.
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Dec 9, 2010
I'm working on an application that will send an email at a certian point.I'm using System.Net.Mail and it works fine when I do a "Debug - Start Debugging". But when I build the application, and run it, it crashes the whole thing when it gets to the client.Send(message) part.[code]
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Apr 1, 2011
I am wanting to perform certain processes before the program closes. I can get them through the File > Exit part of my menu, but I can not find the VB6 form_unload equivalent in VB2010. I have tried Form_QueryUnload but it never gets called when I close by using the RED "X".
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Aug 17, 2010
how to close projects or forms than called by ((shell)) function in vb6?
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Jul 2, 2010
Even though there are many examples of Invoke operations, I can't find something that works for me. (I'm using VS 2008, and working in VB)Here is what i have:
A main module with functions (thread 1) that starts a BeginRead for a TCPClient. When the callback function executes (on thread 3), I want to call a function from the main module, in the main thread. All I get even with Invokes is calling functions that always run in thread 3, not the parent thread.
I call:MsgBox("Function name: " & Thread.CurrentThread.ManagedThreadId)
in each of my functions do determine on what thread it is executed. At some point, from the infinite read callback function I will have to get a function to show a form, but that function gets caught in the callback thread and freezes, instead of running in the main thread.PS: the callback that I pass to the BeginRead of the TCPClient is a function, not a class, so I can't use raise events.All I need is to call a function to run in the main thread (main module) from another thread.
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Feb 9, 2011
i was wondering if it possible to have a condition where lets say you have a column in the datatable called amount and a textbox acting as the filter called say maxamount to set it so the rowfilter when filtering the table will sum the number in the amount column until the number in maxamount is met, then stop and only return the rows where the total sum of the amount column is equal or less than the maxamount value, so i guess if the next row takes us over the maxamount it discards this row and returns the rows previous to it. is this possible using datagridview rowfilter or should i be loooking elsewhere to achieve this?
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Jun 5, 2011
I have an sql table called Stock with two fields called StockID and StockCode. I want the user to select the stockcode from a combo which in turn populates the stockid for that item into a lable on my form. I have already populated the stockcode into the combo but dont know how to compelte the rest.
Imports System.Data.SqlClient
Public Class cbo2
Private Sub cbo2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
[CODE]...
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Aug 11, 2009
I have a form called FrmPracDetails which is built up with a List view called LvwColProc. Therefore when you click a field on the LvwColProc it takes you to another form called FrmColProcessing, here you can make changes to certain fields which are also present on FrmPracDetails. What I want to do is when you make changes on FrmColProcesing and Click the Save Button (which calls the Save function)the changes appear instantly on FrmPracDetails. Please note, FrmColProcessing will always be open next to FrmPracDetails. I have tried to put this code in the Save function present in FrmCol Processing as shown below, but it doesnt Refresh FrmPracDetails form. [code]
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Apr 2, 2012
I have the following line of code in my program:
JCL_History.Enqueue(JCL_History(I))
This JCL_History object is basically a Generic.List encapsulated in a wrapper and has the following method:
Public Sub Enqueue(ByRef value As String)
If Members.Contains(value) Then
Me.RemoveAt(Members.IndexOf(value))
[Code].....
In my testing I have 2 items in this JCL_History list. When I call that first line of code I posted (the one that invokes Enqueue) with I = 1 I expect the first item to be shuffled to the bottom and the second item to be shuffled to the top.
After the thread returns from Enqueue I notice that this is exactly what happens to my list, HOWEVER if I hit the "step_in" button after the execution of Enqueue I go into the Default Property's set method where Index = 1 and value = and it screws everything up, because the item that got shuffled to the end (index 1) gets overwritten by the item value shuffled to the top.
So basically the set method on the default property is getting called at what I think to be a completely ridiculous time. What gives? By the way I'm running VS2005 on XP.
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Jan 16, 2009
I'm currently in the process of building a text editor type program, and have run into a brick wall. I haven't done VB in years, so I may just need a little reminder on some things. I have coded everything so far as far as opening files, saving them, changing fonts, colors, etc. However, I'm looking to add a Close button to my menu strip that will just close the currently opened file, and not the entire program, while also ask the user if he/she would like to save before closing the file, and then if they select yes, it will show the save dialog, and if not, it will go ahead and close the currently opened item.
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Apr 11, 2012
Can you look at my coding and let me know what I'm missing or doing wrong?I have a SSRS report that is called from a ReportViewer control and the ProcessingMode for this control is Remote. The report also has 1 parameter in it's DataSet.In the code I placed a MsgBox to make sure the code is finding the parameter and returning the parameter name. I am trying to stick the value of 10 into the parameter for playerID 10. Data for this player does exist.
I believe I need to add some more code to make this work but I'm not sure what else to add.
When the code executes the report is displayed but no data is shown in the report.
[Code]...
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May 13, 2010
I recently found an awesome tool called "Freemind" that is called a 'mind mapping' program. It's similar to MS Visio but way cooler and more automated.I reeeallly would like to integrate this into a VB.net Form, but how?
Has anyone seen or heard of mind mapping inside VB.net before? Are there programs out there already that work with VB.net or anyone have an example they have seen / built that works?
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Dec 9, 2011
I have a dll that someone made me in C++. I needed to use this dll in VB, in order to do that I had to make another dll in C++ that has functions I can call in VB.
The C++ dll I made has 4 functions. 2 callback functions that retrieve information from the original C++. And 2 functions that I can call from VB to send that information.
I know the original dll works fine as Ive tested it endlessly in a console app.
However when I use it with my dll and VB.. I get random crashes.
There is almost no code in my VB app as its just for testing. It just outputs the information so theres no problem there.
I believe the problem is in the C++ dll I made. I am pretty new with C++.I think maybe a variable gets accessed in 2spots at the same time (is this possible?) and causes it to crash?[code]...
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Sep 5, 2011
My app wont start up on any 32bit PCs. It brings an error. Ive tried all the solutions mentioned like going into Compile and changing the Platform, and other things. I have come to the conclusion it Might just be something faulty with my coding. Here is the only place in my code that could be doing it.
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Jan 28, 2009
im creating a project on vb and every time i get quite far into it, it seems to stop taking in commands. For example i have form 1 with loads of buttons and wen i add another one and start debugging the new button (or whatever) wont be their, this has now happend three times and im getting very annoyed.
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Nov 16, 2010
An application working fine on Microsoft Small Business Server 2003 (Windows 2003) 32 bit when installed on Microsoft Small Business Server 2008 (Windows 2008) 64 bit crashed with the following trace;SUB: MyApplication_UnhandledExceptionException Type: System.TypeInitializationExceptionMessage: The type initializer for 'IV.modMain' threw an excep
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Aug 5, 2011
I developed a .net application which uses bonjour to chat with other instances of the app on LAN. The application works fine on 5 pcs(4 with xp sp3 and 1 with windows 7) out of 6. On one computer (with windows 7 installed) the app crashes as soon as i try to register into bonjour service.
After digging deep into the problem i noticed that too many svchost.exe processes are running on the pc on which app crashes. After carefully terminating the svchost.exe's i came to know that by terminating one svchost.exe which consumes around 50Mb Ram, the app works absolutely fine.
The process path "C:\Windows\System32\svchost.exe"
Process Command Line "C:\Windows\System32\svchost.exe -k LocalSystemNetworkRestricted"
When i terminate the process, app starts working fine.
PS : Even after terminating the process restarts itself and app works fine.
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Mar 17, 2011
I'm trying to get threading to work in ASP.NET but for some reason it keeps crashing my local server, and simply does not work at all when uploaded online. Here's the code:
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Jun 1, 2009
but it's strange. I have a few combo boxes on a form that are fed via select query. They each are populated by their own table. Each of the tables feeding them have a codeassociated with a name, function etc... the code is what is stored in the form's table. I have another select query that converts the code to the name or whatever so that the user does not see the code, but the name associated with it when the form loads.What is happening is: The form loads and if i don't touch any of these combo boxes every thing is fine if i update them, I can't tab off the combo box or move the cursor anywhere, or even close the form. I have one of these boxes with the same code and it works fine.. I don't understand what is going on... I have an after update function that is the same on all of them and it is indeed updating correctly....
Public Shared Function LoadCallSource() As String
Dim sConnectionString As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:Documents
and Settingsdiw07My DocumentsDaily Backupsphone memo backend.mdb"
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Jan 30, 2012
this just makes no sense at all right now...the last time that I was debugging my game, this worked fine, now it crashes my game every time I try to load... ok, I have the users chosen font saved to the my.settings file of the game, and now, every single time that I go to launch the game, it crashes upon trying to load this chunk of the my.settings file...
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May 11, 2012
for our culminating activity we must make a program that uses a bunch of things etc.
i decided to go the extra mile and make sudoku.
The problem lies in generating the puzzle, the program always crashes, but there is never an error. im sure there are easy ways to make the generator, but from what we've learned this is the only way i know how to do it.
Private Sub FirstBlock()
Randomize()
intNumber(0, 0) = Int(9 * Rnd() + 1)
[Code]....
i made a function for each 3x3 square, and what happens is the block its currently on, checks for interferences horizontally, vertically, and within each 3x3 square, because computers process in order, i set it so that it only checks for previous block interferences, since this is the first 3x3 quadrant, there are no previous horizontal/verticals to check.
The code works fine, the problem is when i run it, it says its running but no form appears, i learned to use a progressbar to try and separate each 3x3 block to generate individually, to try and split the processes up 1 second at a time. the problem is, it does run, but it only generates a certain amount before it crashes, and every time its different, sometimes it generates half the puzzle, sometimes 1/3rd, sometimes only the first quadrant.
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Feb 20, 2011
In a program I have written I have FileSystemWatcher pointed two directories. When there is a change it keys up and using a listbox rewrites the files in the folder to the listbox. This all works just dandy.. however..
I wanted to change the listbox out for a TreeView. When I first initialize the TreeView on program start, no problems, but when the FileSystemWatcher kicks in the program crashes. I have tried running the debug but it crashes without any error, just the windows error that the program has stopped working.
I am running Dual XEON Quads with 8Gb RAM and Win7 Pro up to date on all patches so there shouldn't be a problem there.
Here is the code for the listbox:
'Setup Filewatcher for Scan Folder List
Public scanfolder1 As FileSystemWatcher
Public scanfolder2 As FileSystemWatcher
[Code].....
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Sep 18, 2011
I am really pulling my hair out on a problem with my VB Windows Forms app, which appears to be overwriting memory and causing everything on my system to start crashing - have to Logoff or Restart to get a stable system back. I have reported this problem on Connect [URL].. but no response as yet. I am hoping that someone can help me understand what I am doing wrong or how I can work around the problem.
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Apr 15, 2010
Is there a way how i can see why my application keeps randomly crashing?
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Jun 4, 2010
I am writing an application to compare each item on listbox1 to all items on listbox2. If the item is found, then remove it from both lists. The goal is to only have the items that were not found remain on both lists.
The problem is, the application just hangs and I never get any results. I looked at my code several times and I cannot figure out what's going on (programming noob I know.
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May 17, 2010
I need to check and see if I can access a file(the file is in use) So When I try to access it the application crashes. When I can access the file without the application crashing I would like a msgbox to pop up.
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May 30, 2011
it only fills the first element of the array catches on the second run through
Private Sub fillArrayFromFile()
Try
FileOpen(5, "Data.dat", OpenMode.Input)
While Not EOF(5)
[code].....
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Jan 12, 2012
This is an annoying issue that started less than a week ago and couldn't come at a worse time, as I have a major project deadline to meet. At least once every TEN minutes, the program crashes with the error "Microsoft Visual Studio has stopped working" -- it only occurs when I am writing/editing code while execution is paused (Edit and Continue), which I do all the time since I am stepping through rather complex subroutines line-by-line. I literally have trained myself to save after each line of code I write, delete, or change, so thankfully I never lose much, if anything, when I restart, but it is irritating and time-consuming having to set up everything in the program and get to the place in the code that I was before. I have installed VS 2010 SP1, tried deleting the .suo file, and a few other supposed fixes that I came across online, to no avail.[code]...
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Feb 27, 2009
I want to add a picture in my picturebox. I can do this with a normal link to my directory, but I want it relatively.I also have another problem with this picturebox. For some rows in my database, there isn't a filename in the Picture column. And when I select this row in my program. The program crashes because the program can't find a filename.What can I do to make sure that my program keeps working and that there is just no picture in my picturebox?This is the code I have now
Private Sub ShowPictureTonen()
Dim dtrPicture As dtsMuziekcollectie.tblDVDInhoudRow
Dim strLinkPicture As String
[code].....
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Aug 10, 2011
I am loading 25000 records into my gridview with 70 Columns and it is crashing.
Why is it crashing?
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