Specifically Load Or Unload A DLL?
Feb 26, 2010
I am calling a Fortran DLL from Vb.Net. I am declaring this in the class and then I am calling the DLL. I made this Fortran DLL from a Fortran Exe code. If I just use the exe code of the Fortran program I get different values than if I use Fortran DLL. First I thought may be there is a delay, so I used Sleep() before the end of the loop. But this does not change the values I am getting. I don;t understand why the results are different in exe and DLL, since I made DLL using the same exe code. I am not sure if the DLL is completely exited before it called again. Below is the code (partial).
Declare Sub abbb Lib "C:Documents and Settingssanjida.tamannaMy DocumentsVisual Studio 2005ProjectsDll53Dll53DebugDll53.dll" Alias "aaa" (ByRef TOL1 As Single, ByRef tt1 As Single, ByRef TEND1 As Single, ByRef t_exposure2 As Single)
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Mar 14, 2009
My question is: how to delete a specifically cell in sql datarow from a specifically datatble to insert i have the folowing
Dim AgendaData As New AgendaData AgendaData.TijdDagWeekJaar = TijdDagWeekJaar.Text AgendaData.WeekJaar = WeekJaar.Text AgendaData.JaarMaand = JaarMaand.Text AgendaData.Jaar = Jaar.Text AgendaData.textbox2 = onderwerp1.Text AgendaData.textbox3 = Onderwerp2.Text AgendaData.textbox4 = Onderwerp3.Text AgendaData.textbox5 = Onderwerp4.Text AgendaData.textbox6 = Onderwerp5.Text
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Dec 1, 2011
I am working on a project where I have to load assemblies (lets call them tasks) at runtime, run the task and then be able to kill off the whole assembly so that the dll can be replaced without interrupting the main application.There are many of these tasks running within the main application,some run sequentially and some run in parallel.Occasionally one or to of these tasks need to be updated and then re-added to the queue. Currently we are stopping the entire application and interrupting the other tasks at whatever stage they are at, which is not ideal.I have figured out that I will have to load each assembly into a separate AppDomain, but loading the assemblies in those domains is proving difficult, especially when I need to actually run the tasks and receive events from them.I have been looking into this problem for a couple of days and have still not managed to get a working proof-of-concept.
I have an Interface for the tasks which includes a 'run' and 'kill' method (subs) and a 'taskstep','complete' and 'killed' event.'taskstep' returns an object to be cached later, 'complete' fires when the whole task is done and 'killed' fires when it is ready to be unloaded.There should also be a timeout on the whole process of two hours and a timeout of 2 minutes on the killed event in case it gets stuck, at which point I would like to be able to unload it, forcing any threads to terminate (which is what 'kill' should do anyway).Each assembly may contain several tasks, all of which should loadable be unloadable.I have no problems loading these tasks as 'plugins' but am lost when trying to both use them and unload them. If I have to create some elaborate wrapper then so be it but is what I need even possible? I have tried inheriting from MarshalByRefObject but I do not even know the assembly fullname unless I load it first, which then locks the file. I have tried loading from a byte array of the assembly. This means that the file is not locked but a copy of it remains in the current appdomain. This will become problematic over the following months / years![code]
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Jun 23, 2010
Followup to a previous post: It's been determined that Windows Device Drivers cannot be written in VB.NET; that's being dealt with separately.
What I'm interested to know here is if there's a DotNET Framework facility for adding/removing/managing device drivers; for example, can I build a VB.NET application to list loaded drivers, or drivers attached to a specific device, then load or unload those drivers as needed? It never hurts to try. In a worst case scenario, you'll learn from it.
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Oct 9, 2009
load and unload form just like vb6 in vs 2005 using vb.net. I'm trying this code.
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
Me.Close()
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but when i click the button, nothing happened..
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May 6, 2012
I have an application in which i need to load a specific keyboard layout only when application is running and a text box (Textbox1) is under focus. I don't have an idea to load a specific keyboarded in VB.NET via programming.
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May 29, 2009
I am using MDI form and nearly more than 10 child forms.. Here, When i load or unload some forms, it flickers very much.. It is not as much good.. So i need to avoid this.. How to avoid form flickering?
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Apr 23, 2012
Not sure if this is the correct place for this postWhat I am trying to do is update dll's in my application.Using VB with dotnet 2 (Visual Studio 2010)The Project has a number of Dll's one of each department i.e. Sales is sales.dll... Development is development.dll etc....Each dll has classes/User controls which is used and dispose depending on the section within the application.Once work has been completed with a dll, it put in the deployment area, currently another is program launching checks the file verison and updates as required, before the main application lauches, this works. The exe hasn't needed updated for a long time as all the changes are in the dlls.
What i have been looking at is update method for the dll's dymanically, when not in use, when the dll called into use or disposed of.I have looking at LoadLibrary/FreeLibrary and application.domain. I have been reading loads and tried out some of the examples, with a modified to suit. I am just not getting it.
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Jun 27, 2009
I'm just wondering, what is the best way to load and unload forms with visual studio 2005. In VB6, I used to use the following at a button click, for example.
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Dec 29, 2011
I'm in the process of trying to create a new appdomain to load plugin dll's, then unload the new appdomain so I can update the plugin dll's without having to exit the main application. There are many, many examples out there and it looks like it should be fairly straightforward, however I'm having a problem where the main application is loading the plugin dll's along with the new appdomain. Of course this is a problem because I cannot overwrite the plugin dll's if they live in the main appdomain. Based on the examples I've seen the code below should only load the plugin dll into the new appdomain, however for some reason it also loads into the main appdomain.
Dim oDomain As AppDomain = Nothing
Dim oSetup As New System.AppDomainSetup()
With oSetup
[code]....
The IDPAPlugin interface is in a seperate project that both the plugin dll and the main application reference.
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Jan 15, 2007
Our company has an app that load their components by System.Reflection.Load (By the way, an awesome technique )But, we start to monitorate the application and detect a extrange grow up of memory (actually when our application still all day on air, their allocate memory on task manager is 200 MB plus memory) And all of our components (60 plus DLLs) is load by this technique.My doubt is how to deallocate this assemblies or how the best way to deallocate any assemblies loaded by the System.Reflection.Assemblie.Load method?
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Jun 16, 2010
VB 6.0
Private Sub Form_Unload(Cancel As Integer)
VB.NET 2008
VB 6.0
Private Sub Form_QueryUnload(Cancel As Integer, UnloadMode As Integer)
VB.NET 2008
is VB.Net supported this two events ?
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Apr 13, 2011
I have a bunch of old VB.NET code, written originally on VS2005, and now I no longer have the license. I downloaded VS2010 free edition, and I just want to apply a relatively minor patch to an assembly/DLL. This particular DLL is being used by an existing Windows service (also written in VB.NET), and it's the server side implementation of a TCP remoting implementation.
So I need my patched code to be compatible with it all of this. When I naively tried to just build under VS2010, drop the DLL in place, and restart the service, it bails with some error about bad magic number or something. (I'm assuming because it's .NET 3.0 and the .NET 2.0 runtime has no idea how to deal with that).
Sorry for the long lead up, but I'm hoping there's some way in VS to say, 'build this as a .NET 2.0 assembly'. If this isn't possible, what are my options?
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Feb 29, 2012
I'm currently stuck on how to sort/organize the results from an Oracle database, here's my issue. While Not rs.EOF
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Is there a way to manually sort the results so I can get the index to start at 4 instead of 7?
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Sep 20, 2010
I have a question specifically about getting the current cookies set to a particular visitor on an ASP.NET webpage. I understand you need to use Request.Cookies - and by default it returns a collection of all cookies set, as an HTTPCookieCollection. However, the MSDN documentation states that you do: Request.Cookies("Username") as an example, in order to fetch an individual cookie and then compare whether it is set, etc. All fine and dandy but why adding parentheses and a string does the type suddenly change to
HTTPCookie.
I understand HTTPCookie is for dealing with individual cookies and HTTPCookieCollection is for dealing with multiple cookies at a time for like iteration purposes, etc., but I don't understand when on the MSDN documentation it explicitly states that the Request.Cookies property (the Cookies property) is of type HTTPCookieCollection, and if you do what I explained it changes the type (I can see this from IntelliSense) and it does not state this happens in the MSDN documentation. I'm not asking about the MSDN documentation lol, but why this happens when adding the parentheses and a string denoting the cookie name. I'm still pretty new to Visual Basic. By the way, I'm doing this all in Visual Web Developer although using VB as the language of choice.
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Mar 15, 2012
I am using 3 unbound DataGridView controls to display certain information. To load the information into those DGVs, I am pulling the information from an encrypted file, decrypting it, parsing the information, then trying to fill the DGVs with that information. The loading from the file is called by the menu item click. Here is what I have so far:
Private Sub miCLoad_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
Handles miCLoad.Click
Dim FilePath As String = "C:FListCList.clt"
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Jan 4, 2011
I am trying to retrieve the Attributes of a class's property specifically. So for example. Let's say I have a class called "Employee", and a custom attribute called CustomLabelAttribute with a string value. What would I need to do to retrieve the value of CustomLabelAttribute for Employee.FirstName specifically? I assume I will need to use reflection, but it's kind of new to me, and I've just recently started using it on any level.
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May 17, 2012
I was able to create programs way back year 2006 specifically using VB6, however, the line of work that I've been to and currently in to is not related to programming at all. I was not able to constantly hone my programming skills and I wasn't able to adjust in today's latest updates. Now, step by step I am trying to rebuild myself. I would like to ask the guidance of all those experienced members here, if you may.
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Oct 17, 2011
So basically, i have 2 int variables, x and y i am using to create a grid of pictureboxes.This is all fluid and built on runtime.I am trying to specifically change the picturebox on click if mine = 2.I cannot specifically change one, when i click any, it changes all of them.
Heres my code:
Public Class Form1
Inherits System.Windows.Forms.Form
Dim images(8) As Image 'declares image array
[code].....
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Jan 6, 2010
Are there any tools available for automatically formatting vb.net code - specifically for adding line breaks at a predefined line length? I'm working with a lot of code with long lines (thousands of lines), and manually reformatting it is quite time consuming. I've seen a number of tools for rearranging code into regions etc., but haven't found any that reformat with line breaks.
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Mar 20, 2012
Are there any built in base number conversion functions in .Net specifically decimal to hex?
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Jan 30, 2010
I want to run a subroutine to clear some things up when the user exits the application. I tried looking for a Form_Unload event or anything similar, is there a way to do this?I open a database connection on Form_Load, and would like to close it when the user exits the app.
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Apr 22, 2010
I like to know how to unload a single form in vb.net.I tired form.showdialog() and form=nothing,but this is not working.
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Sep 23, 2009
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Me.Close() End Sub
after the program was executed, warning is come out like this "object Disposed Exception was unhandled"
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Nov 4, 2011
I am new to regular expressions and I am trying to implement the metaphone algorithm in vb.net. [URL] The algorithm has lots of steps to replace characters depending on certain conditions. (ex. replace w unless followed by a vowel). Is there a way to handle branching logic using regular expressions?
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Sep 15, 2009
I am trying to extract a url from a html page that is located specifically between the <h2 </h2> header. For example the following header is in the html page;
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Dec 2, 2010
I have an ApDomain that is running a Main Routine, for example:
Public Sub Main() Implements Interfaces.IScript.Main
For a as Integer=1 to 99999
[Code]...
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Sep 25, 2006
I have a form that I use to get the user to input such as a username and password in order to make a network connection. This connection can be disconnected and reconnected as many times as neccessary whilst the application continues to run.
I obviously, therefore, need the form's text boxes, combo boxes etc to reset to their blank versions every time that the form is shown.
In VB6 this was easy; you just unload the form which completely removed the form from memory and thus the next time you showed it it was reset to it's blank state. In VB 2005, however, there is no unload so we have to use Close. I have done this and assumed that it would function in the same was that unload did in VB6.
The problem is that when I close the form using the form.close event handler the form disappears perfectly but when the form.show/showdialog is used the old form data still remains telling me that the form hasn't actually been unloaded but rather appears to have just been hidden.
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Feb 15, 2010
I have single form in VB.net and I want to close or unload this application in Form1()event only once it get sussessful. I have some code to execute in form1 and after successfule execution I want it to unload. For this I have written below lines but it throws an error.public Form1()
[Code]...
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Nov 30, 2010
I have a button that I am trying to only allow specific people to see. So I need to unload it or hide it if they aren't the correct person or have the requirements. When I try to use btnUpdate.hide() in my else it will first allow someone to click on the button and use it then it will hide it. It's not hiding the button right away. Thats what lead me to think that maybe i am suppose to unload it some how if its not the correct user or users.
How do i unload a button if its not the correct users.
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