I am working to a VB.NET windows forms projet in .NET 1.1. And I have this type of architecture, very simplified.[code]...
Depending of the type of test I am doing I create an instance of a specific test derived from BaseTestLogic. But I found that after hundreds of object creations I can have StackOverflow exception.
I checked my code and saw that I forgot to remove the handler to Timer Tick. The question is, where and when is it correct to remove hadler?
Do I need to implement the IDisposable interface in the base class and RemoveHandler in Dispose?
If I always need to call RemoveHandler after using AddHandler, where is the best place to do so? I have searched several similar questions as follows, but I do not quite understand.When and where to call the RemoveHandler in VB.NET? AddHandler/RemoveHandler Not Disposing Correctly..I thought garbage collection in c# or vb.net will take care of unused objects. Also, in vb.net designer, it automatically generates Dispose Sub. So I did not pay attention to programally releasing resource at all. Will I have any memory leak problems? Please kindly provide me some links/documents for me to start learning.[code]
To streamline code, I increasingly rely on lambda expressions. But I may have hit against the wall in the attempt of removing an event handler set by a lambda expression. This really eludes me. The code below shows two samples: Alt1 uses a plain lambda expression as delegate and works fine: the object size increases as the numeric control varies. However, the drawback is that the handler cannot be removed:
RemoveHandler Me.upDnScale.ValueChanged, Sub(sender As Object, e As Object) ScaleObject1(sender, e, objTgt) According to this MSDN article, a variable should be used to set/remove lambda based handlers. Alt2 shows a couple of attempts, but none works.
Using VB2008 Express I'm getting the following warning on a RemoveHandler statement and subsequent issues since the event is still hooked. Warning 1 The 'AddressOf' expression has no effect in this context because the method argument to 'AddressOf' requires a relaxed conversion to the delegate type of the event. Assign the 'AddressOf' expression to a variable, and use the variable to add or remove the method as the handler.
I'm getting a bit more fluent in VB.Net, but am still a bit green around the edges in certain aspects. I'm creating custom controls, and am starting to rely heavily on AddHandlers to manage them.Until recently, I didn't realize that you can add multiple event handlers for the same control and same address
[code]...
The above code would create 10,000 copies of the same event, and if I would click on combobutton1, the event would fire 10,000 times. I only need to fire the event once, but sometimes my code is a bit circular, and there may be an instance where two or more addhandlers are designated for a given control and address. Is there a way to have a loop on my custom dispose event where it would look something like:
[code]...
Or better yet, remove all events from a control(On a side note, is there any way in the debug mode to see all the active events attached to a control?)
I have attempted to understand the behind-the-scenes stuff for Events several times. I must have read at least a dozen articles but there is still some ambiguity in my head.
I'm trying to call other EXE's from my program I'm writing. Inside my project I have a folder called progs with exe's inside it. How can I call these from button clicks?
How can I get my program to take a number from an Access Database and by using the internet call the persons number. I will have a pre-recorded message that I want the program to use when it makes the call, but my main problem is I can't find anyway of getting the program to make the call using the internet.
I have written a set of functions in VB 9 that I want to be able to call from several different programs (also VB 9). I compiled the functions into a dll and I am attempting to call the functions but to no avail. Within the dll project, the class is Public as are the Functions.Within the exe project, I have declared the dll functions using Declare statements of the following form:Public Declare Auto Function FunctionName Lib "DllName.dll" ( ) As String.I thought that this was all that is required. It builds fine but when I attempt to call the dll functions, no entry point is found.
I am the author of the MAPM arbitrary precision math library. This is a library which allows the user to make any calculation to any desired precision level. The library is written in straight ANSI C.
On many occasions, I get an email on how to use the library from a VB.NET / Visual Basic application. I have very little basic experience, and I don't know what to tell them. I would really like to tell them how to proceed to call MAPM from a basic application.
Let's assume they can compile the library with a C compiler and create a DLL.
I have created two forms in vb.net. From the first form when i click the "delete" button the form2 has to get displayed. I tried new form statement. But it is showing a blank form. I want to display the second form which i have created.[code]...
My name is malky, a programming student currently learning visual basic 2010. I mostly know basic level of programmming (such as playing around with textboxes and such) and for my next project, I need to be able to call an executable file (the On Screen Keyboard to be exact) as my program first loads.
I was wondering if someone could tell me the best way to call a Visual Basic program from Java. I have a few VB applications that I want to run from a Java application that I'm building.
I have an existing program, and it uses DLL files to do things I wish to implement a DLL in VB.NET the DLL's are not COM, they are standard call the method or function type DLL's
How would I implement the following in a VB.NET DLL extern "C" void __Export_TYPE HelloWorld(char *path)
I want to create a vb.net program to install a .exe package which requires selection. A user must choose a group name from the list . The list should have id number i.e. 1 to 100. Instead of copying the value name it should take the id number and insert into the below line in the Groupid part.[code...]
i have created the form and the listbox .I have played with Processstart to call that SSetup but i can't get it to work.
I build two programs, 1 - bootstrap and 1 - mainprogram
now, mainprogram has 2 constructors, the default and the one which i defined and it accepts an integer the default constructor checks the variable named iscalled a type of integer to have a value of 1 or zero, if its zero then it should shows a message saying "Improper initialization" then exits..
What I mean here is, mainprogram should only run if its called by the bootstrap program.
I am struggling with this program which uses emgucv(an opencv wrapper for .net) for about 2 weeks. The problem is unfortunately not programming, but setting up emgucv in such a way that it works. I didn't manage to do so for vb.net so I tried doing it for ironpython(because I know python too). Emgucv seems to work perfectly when using ironpython, so I created a function that takes an image as an argument and analyses it in the way I want, returning another image with the results in it. The problem is I want to call this function, giving it the image argument(it could be a string containing the path) from within VB.net and become another string containing the result image as return. I later plan to package that project in a setup so I can redistribute it.
I'm looking for a more elegant way to work around a problem I have
Code: Private Sub MnuCheckForUpdates_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MnuCheckForUpdates.Click Dim startInfo As New ProcessStartInfo(mStartUpPath & "" & "Updater.exe") Process.Start(startInfo) End Sub
As you can see I�m calling my updater program, but I want some code to run only after the Updater has closed.My work around was to:
A - Initially load the updater. B � Start a time C � Check if the updater is still running. D � If its not call the routine in the timer event.
But this is not elegant is there another way around this, I can call events in the updater but I don�t think I can join them in someway to ProcessStartInfo Class .
In one of my vb.net 2008 application i have called a java class file through batch process which creates txt file and jar file and put in app path folder.[code]...
I have java script in my page and i want to call it from vb.net code behind from function AND didn't want to call it (onload or onclick or any similar event) but i want to call it from function doing looping.so it will be run more one time
