Multithreading - Understanding The Way Application.Run() Works?
Nov 4, 2010
As far as I understand from the docs, it seems that Application.Run() starts a message loop on the current thread, which in turns enables it to process user input (Is that right?).The overloaded version Application.Run(Form) basically does the same, only it exists when the form closes, and it shows the form by default.timer ticks after 20mns, and has to execute say approx. 15 tasks one by one, every time creating an instance of a progress dialog, initially hidden in the taskbar.
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Aug 31, 2011
I have some functions in a web application that do a lot of calculations and as a result have high CPU usage which affects the rest of the application when other users are accessing it. I have tried background-worker to no avail , the only thing that seems to work in using another thread and setting the priority to low, can the UI be updated from a worker thread? specifically I am trying to bind a grid to a dataset processed in the worker thread
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May 4, 2011
I have a console application that is built in VB.Net. Now I have a timer in that application. All I want to do is at a particyualr time i will call another exe (which is built in VB 6.0) and again get the control back to this console application. Now what is happening is that I am being able to call the second exe from the console application, but then the control is not returning back to the same console application.
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Jun 8, 2011
I am a final year computer science student and i was confronted with this topic: Design, development and implementation of an efficient Bandwidth management system. i code with Vb.net and microsoft SQL 2008 as my database engine. honestly i've not written such application before, so i need a guide how the application can be built(especially the interface).please am not asking for the source code(if there is any), i only need a detailed flow on how the application works.
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Jul 20, 2010
We have an application(.exe), longtime back some developer wrote the code and now he is not with the company. I happend to be support this application. I have to do some modifications in the code.I have a .vb file and .Config file with me. The .VB file is calling a SSIS pkg and doing some dataload and creates some files and it formate the file names what it generates and it send emails to large group of ppl.I have opend the code in Visaulstudio but i do not have any option to debug or do some breakpoints.How can I use this config file?Do I have to add both of them in the project? To debug I need SSIS pkg as well so do I have to add all these 3 of them into my solution?I know where to change the code, after changing the code how can I create a application EXE file?
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Mar 29, 2011
I have had afew people test my application and all of the 32-bit users are telling me it is not working.
Problem signature: Problem Event Name:
CLR20r3 Problem Signature 02: 1.0.0.0
Problem Signature 03: 4d9235a5 Problem
[code]....
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Mar 8, 2010
I have an application developed in VS2008 VB.net. It is a numberpad with buttons for 0 - 9.When published and installed on my local PC, everything works as expected. I open a browser window, and am able to click a number-button and have the corrosponding number sent to the active window location. When installed on other PC's, the numbers sent to the active window location are repeated many many times. If you click the "3" button, then anywhere from 10 to 50 "3"s are sent to the screen.All PC's have Windows XP Professional, Version 2002, Service Pack 3.The only differences I can detect are the many many .NET frameworks installed on my computer and not on others.[code]
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Oct 27, 2009
Can I make an application that works on other OS's (e.g. Mac OS X, Linux)?
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Nov 23, 2011
i got the following regex, which is working on some regex testers out there flawlessly.I want 1 item with "500", 1 with "600" and 1 with "-100".
Dim matches As MatchCollection
Dim regex As New Regex("(d+)s/s(d+)s((-?d+))")
matches = regex.Matches("500 / 600 (-100)")
My matches.count is one, with the complete string. Nothing else.
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Jun 8, 2012
I am totally confused about the way SQL server Express works with my application, it seems like it is a hit and miss whether it works or not.In my Server Explorer if I show data, I see data in my tables.
[Code]...
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Jul 2, 2010
I seem to have a problem with an application i made. I hope you can help me with this as it has puzzled me for awhile now.
[Code]...
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Jun 23, 2010
I have VB.Net application that has worked fine for years on XP and Windows 7. For some reason the last update I put out does not run even the simplest VB commands.Simple Environ() fails.I have tried putting simple VB commands onto a MsgBox on the start of the app and everything raises an error. I have no idea what is going on! The exact same app runs fine on Windows 7 clients. All the XP machines including a fresh XP virtual machine with the .Net 3.5 framework even gives the errors. No VB commands are working. I thought maybe something happened to my vbproj files, so I copied an older one from a couple weeks ago when things worked fine and it still does not work.
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Mar 14, 2010
I have a client/server chat application which I made . My question is how do I make the application work not only Locally but On any other network. I tried putting my IP in the part of creation of the client socket .
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Jun 15, 2011
I'm developing an application in vb.net. You drag any type of file onto the exe, and a window pops up with some options for the file, then it saves the file to a different location, works some SQL magic, etc. It works great for the most part. The only issue I've found is that if the path of the file contains any spaces, the application will crash immediately with the error window:[URl]..I'm using: Private filename as String = Command$ This is located right inside my form's class declaration, not within a sub/function.Without this line, my program runs fine (although useless, without accessing the file).I've also tried (I think this was it, I don't have the code with me at the moment): Private filename as String = Environment.CommandLine So, in vb.net, is there a way to drag a file onto an exe and use that path name, even if there are spaces in the path name?
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Apr 29, 2011
I am writing an application that has to read and interpret data stored in some PDF files. The reading part is done but I am only able to get a dump of all the words on a page and not the format of the words. What I mean is that if I have to extract a table, I am getting the numbers in the table but not the markup which defines the table.
Further, there is some formatting used which displays a few of these numbers within parentheses (meaning that those numbers are negative) but the parentheses themselves are not part of the text. Hence, I am not able to distinguish between positive and negative numbers present in the PDF table!
How do you get the PDF markup along with the text? Is a PDF similar in structure to an XML with tags used to markup tables etc.? If not, then, is there a resource which describes the salient features of the PDF DOM? I am using VBA and the Acrobat library (AcroExch etc.)
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May 14, 2010
The fact is I'm making an application, which users can install by using a Setup file...once installed the data in the database can be updated by a centralized server. To do this, they can insert a DVD/CD-ROM and export the necessary data towards it. I need to do it that way, because some of the users who really need this data will be using stand alone computers.The application gets it's data from a mdb-file and the connection remains open as long a person works with the application (maybe not the best way to do, but I know :-) )...when the user uses the application, he can perform an export...this exports the .ini-file and pictures (which works fine), but he also needs to export the mdb behind the application...I already tried connection.close() before and connection.open() after the System.IO.File.Copy...but that doesn't seems to work.
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Jun 3, 2011
So I wrote a VB.net project in Visual studio.I have a scheduled task that is set to run the program every morning at 10AM. If I use windows explorer and double click the application, it runs fine.If I open task scheduler, open the task properties, and browse to the application, then choose run, the program fails, due to Runtime exceptions.I know I have the path entered correctly, since I can debug the instance when it crashes from the task scheduler. VS2010 pulls up my source code.The exception is System.IO.FileNotFoundException, remember, it works fine when I double click the app. If attach a debugger to the process after it is executed from the task scheduler, I can then restart the debugger, and Voila!, The application runs fine.
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Dec 7, 2009
I am trying to use my first predicate and I generate the error:Method 'Public Function FindIndex(list As MyProgram.HTMLFiles) As Boolean' does not have the same signature as delegate 'Delegate Function Predicate(Of T)(obj As String) As Boolean'.[code]
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Mar 15, 2010
I have this RichTextbox in my vb.net form and I would like to when a user click a button, for example to embold the selected text, how would I do this.Also, I do NOT want to use the standard vb.net expressions such as RichTextBox1.SelectedText.Font.Bold = true. I want to do something like RichTextbox1.SelectedRTF="[bold]" & RichTextBox1.SelectedRTF & "[/bold]" or whatever RTF looks like.Can I just add the RTF options random places or can a RichTextBox return an error if the text is in wrong format. I'm mostly looking for info on how to work with RTF without using the standard vb expressions.
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Jun 16, 2010
My goal is to read a data streaming from a machine the streaming is divided in tre main parts,the first is a 10 byte array that declare the length of the second and third part.The second one, the header, is a 22 DWORD (*32bit) ( 88 byte ) structured of mixed data types.I can easly read the value inside this header when the DWORD contains just one information using something like: [code] My problem starts because some of these DWORD contains several indipendent informations, for example DWORD #4 [ channel 2 peaks 31..16] [channel 1 peaks 15..0].For what I understood the first 16 bits ( so 2 bytes) are used to store the information of the first channel , while the second 16 bits are used for the second channel, I tryed converting the first 2 byte with System.BitConverter.ToUInt16()but without success.Can someone explain me what to do and how these numbers are supposed to be stored?
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Dec 14, 2010
so i have a class called FOOTBALL,then another 3 classes/forms that inherit FOOTBALL, they control score (SCOREBOX), possession (POSSBOX), and quarter (QUARTERBOX).the FOOTBALL class has 4 variables, "score" (array of 2 ints), "teams" (array of 2 strings), "possession" (boolean), and "quarter" (int)after that i have another form called MAINBOX, which creates new instances of the 3 classes (SCOREBOX, POSSBOX, and QUARTERBOX) (like this: private scoring = new SCOREBOX)... however they all technically create their own FOOTBALL classes, so I cannot connect them.
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May 29, 2009
I started out with VB.NET but now mostly do C#. I never really got to grips with events in VB. I'm trying to translate an old VB.NET program (from 2002) into C#. I've dealt with everything apart from statements such as these:
Public Event UpgradeProgress(ByVal strProgressString As String, _
ByVal strCurrentFile As String, ByVal intProgressPercent As Integer, _
ByVal lngTimeRemaining As Long, ByRef blnCancel As Boolean)
[code]....
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Feb 27, 2010
It is my understanding that in .Net 4.0, VB will have an in-memory compiler.
I have to admit I don't know a lot about the compilers so I'm trying to understand the advantage of this as compared to what we had before this. Also, will C# be coming out with the same type of compiler?
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May 25, 2012
I'm confused on the results of this code. The results extracts the tag "div" but why isn't the results containing the word "Yoga"? Shouldn't the result have only one element because it should exit the for loop after finding the first element? The results show hundreds of elements
Dim ElementCollection2 As HtmlElementCollection = WebBrowser1.Document.GetElementsByTagName("div")
For Each curElement As HtmlElement In ElementCollection2
[code].....
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Dec 1, 2011
I wanted to know what the main areas are and what the array is actually doing in the code. I know that dim is declaring the variables, but how do i exactly explain this code line by line.
PS: the areas in red are the main areas im trying to understand annotate.
Public Class Form1
Private Sub Label1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Label1.Click
End Sub
[code]....
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Dec 28, 2011
If i have a class called A and a class called B, if B inherits A that means A is the super class and B is the subclass. I have been asked to describe why class A is not an abstract class but as i see it class A is an abstract class A, as it has been created for Class B to use in the future, is it something to do with Class B not being able to access the fields in Class A as although they are private by default?
[Code]...
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Oct 5, 2011
Looking at the following code snippet in VS2008 (this is from the SBS book)
Dim HumanAge As Integer = 0
If HumanAge <> 0 And 7 / HumanAge <= 1 Then
MsgBox("1 dog year or older")[code]....
I expect to get a runtime error, because And evaluates both conditions, which is why in this case AndAlso should be the better operator to use. When I try this code there is no difference in behavior between 'And' & 'AndAlso'. In neither case I get a
runtime error, not even when I flip the conditions around. Is this by design, a lucky accident, or do I just not get it?
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Jun 14, 2010
UPDATE: See the bottom of this question for what I did to solve the problem.I'm trying to understand how the ItemsSource and DataContext properties work in a Silverlight Toolkit DataGrid. I'm currently working with dummy data and trying to get the data in the DataGrid to update when the value of a combo box changes.
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Aug 24, 2010
I have a situation in a program I'm writing where I'm not sure of the best way of coding a couple of objects and was hoping for a few pointers.I am using VB.NET 2003, so F/wrk v1.1. My business is horticultural in nature and I'm trying to help streamline the business with a new order fulfillment app.In my program, I have products. Some products don't have any component parts, but others are made up of a selection of plants.For example: we sell a trowel, which obviously doesn't have any component parts. But we also sell a large vegetable garden, which is made up of, say, 20 rocket plants, 30 salad plants, 5 spring onions, etc.[code]I believe the ProductContents table is technically referred to as a 'join table'?
I have written the classes in VB.NET which load, save, edit the Products and the Plants. I also have Manager classes which store collections of these objects (ProductMgr, PlantMgr).I have dealt with situations before with join tables where there are only two columns which are both FKs and both make up a composite PK (ie - to express a one-to-many relationship). This is pretty straightforward (using my product/plant tables as an example) because when I load an individual Product from the database, I also run a second SELECT query which returns any PlantIDs associated with that PlantID from ProductContents. I store that in an array of integers within the Product object. I can then load Plants from the PlantMgr object based on the PlantIDs stored in this array. I kind-of do the reverse when I save the Product to the database, I run a second INSERT query which updates the ProductContents table with the Plants associated with the Product.Where I'm getting stuck is with the inclusion of the extra 'Quantity' column. I can no longer store the PlantIDs in an array of Integers because I also need to store the Quantity associated with that Plant. I also can't use the PlantMgr object any more (to express which Plants are in each Product) because it also doesn't include any information about Quantity.I was just wondering if there is a standard way of handling this kind of situation, where I have a 'join table' which also includes extra columns as well as the two columns that identify the join.
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Apr 3, 2012
I'm trying to figure out why the following VB.Net code seems unable to upload a file to my ISP's FTP server, since it doesn't report any error but I'm not getting the notification e-mail I'm supposed to receive once a file has been uploaded.So I launched the free Fiddler proxy on 127.0.0.1:7777, but it doesn't report any activity, even with its "Capture FTP Requests" option checked:[code]Is there a way to watch the FTP session to understand why the file seems to be uploaded successfully but I'm getting no success notification?
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