VS 2008 : Work Properly With The Reflection To Create A Module/plugin-based Application?
Sep 24, 2009
I have found a lot of articles about Reflection and know how to create a class. I'm practicing how to work properly with the reflection to create a module/plugin-based application.So I found a simple example which is working great, but it isn't dynamic enough, 'cause it is hard-coded. I need to read all the .dll's from the application.startuppath & "modules" & *.dll and get there names (without the .dll).Code is was testing for practice returns the form (I know that this is not the correct way to call the dll dynamically):
vb.net
Imports System.Reflection Public Class Form1 Private Sub cmdOK_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdOK.Click Dim assemblylink As [Assembly] assemblylink = [Assembly].LoadFrom(Application.StartupPath & "/" & "LoginAssembly.dll") Dim LoginFrm As Form LoginFrm = assemblylink.CreateInstance("LoginAssembly.Login") LoginFrm.Show() End Sub
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May 14, 2009
i want to implement in a program. I'm not asking for code just some advice and maybe a link or 3 to useful pages on the internet.I want to create a plugin system for an application that i want to make. The idea for the plugin system is based on the following...
1-Some graphics editing programs have what i think is called a filter/effects chain. its where you make a list of filters and settings that the program runs to edit the image.
2-In yahoo pipes you take small parts and use them to complete tasks for you mashup (like pulling all the images returned in a search and displaying them).
The system i want advice on is basically a plugin chain system modeled after these 2 idea's where the user selects plugin's and forms a chain out of them.for instance if i wanted to display a picture then i would form a chain of plugins like this
legend:[(inputs)what it does(outputs)]
[show open dialog plugin(output filepath)] -> [(filepath input)open picture plugin(output bitmap object)]->[(input bitmap object)Display a picture plugin(make a form for display)]
The code for the task's will of course be in the plugin's.The problem is i have never done any plugin system before. the hardest part i need help with is getting the plugin's loaded and sending the output's to each other. Also another problem i think is that the plugin's could be for anything (parsing text, displaying a picture, opening a url, downloading a file, etc, etc)Again I'm not asking for code just advice and some useful links to information.
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Nov 16, 2009
I have various projects that use reflection to access and invoke private or internal members in some of the framework classes. These projects all work fine on my machine (running visual basic express 2008), but are they guaranteed to work on another machine, or, say, over a network? I've had a look at Reflection-Permission, but I'm not sure if I need that granting to me or if I grant it to my project!
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Jun 11, 2009
I have had several occasions recently to access a specific class several times over a relatively small time frame.So I've been storing the value of the class in Session and trying to access it on page load, if it's not available creating a new instance and storing that in session.
So instead of constantly replicating the same code for different classes on different pages I'm trying to create an extension method to do this for me.
[Code]...
I'm stuck on what to do when I make my new instance of my class (it would have to have a New() sub)
I'm not sure where to go from here... or even if this is the best way to do it.
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Oct 26, 2011
I'm trying to find the public delegates contained within a bas module in an assembly. I can identify the bas module, find nested types, methods, etc. but there seems to be no way to get nested delegates.
Note: 'GetNestedTypes' does not return delegates for bas modules.
Convert between VB, C#, C++, & Java [URL]
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May 21, 2012
How do I set a field value in a VB.NET module using Reflection?
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May 27, 2009
how to create a uninstall command for a Windows-based application in the Application Folder when creating a new setup project in visual studio 2008.
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Aug 2, 2010
how to create windows installer that will include my application and merge module? I'm using VB .net Visual Studio 2005. I can create a windows installer for merge module and public my application, but I can not have both of them in one setup file.
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Feb 25, 2009
how to create window based application in vb.net
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Jan 19, 2010
I am working on a migration project to convert a Visual Basic 6 system to a new platform. To make life easier for the programmers I would like to develop some plug-ins for the Microsoft Visual Basic 6 IDE. But until now I've found only information about using vb6 to write plug-ins for other programs. how to create a plug-in for the Microsoft Visual Basic 6 IDE (SP6)?
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Oct 19, 2009
sometimes my application will remain running after I close it. If I check the task manager, the process is still running. Is there anything specific that could cause this, or any way I can make sure to close the program completely?
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Jul 6, 2011
I'm feeling frustrated. I have spent hours looking for a good piece of code to capture the keypress events in any windows no matter if my application is focused or not. I need to create an application to work in the background to capture the F5 key. Does anyone have any code?
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Jan 21, 2011
I am trying to create a accept User Name in textbox and as additional feature i want to show suggestion to user automatically. For example if user press "J" he names starting with "J" (present in name table ) should be displayed as drop-down.
Can i do it with TEXTBOX or is there any other simple way?
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May 5, 2012
I am trying to create a small windows forms application that demonstrates how a user can use pen-based input(ona Lenovo X220 tablet PC) to enter text (rather than typing on a keyboard) I am using Visual Basic in Visual Studio 2010.I think the control I want to add to my Visual Basic Project is the Microsoft InkEdit ControlThe instructions I see on other parts of microsoft websites refer to a .net framework componed called InkEdit. The instructions I found so far is to right-mouse click on the tool box, click 'choose items' and then select the Inkedit Control from the .NET Framework components.
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Apr 19, 2011
Have been running this application on 8 PCs since January.My application uses variations of this
Dim Artist4_TBD As New DataView(Me.SSPE_InterCOMM1DataSet.SSPE_ArtScheduler)
[Code]...
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Dec 21, 2008
I am trying to create a plugin system where plugins can be dynamicly loaded (we don't know how many there are, what their classes are called, ...)This is sample code for a plugin:
Code:
Public Interface IPlugin
Sub bla()
Function bla3() As String
End Interface
[code]....
This code SHOULD msgbox("yay") when it finds a type that implements my IPlugin interface. Yet it never finds one. I can't find what I did wrong. It gets to the debug.print("2"), but never gets past the "If GetType(IPlugin).IsAssignableFrom(t) Then".
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Mar 8, 2012
My VB app will not work properly on a Windows 7 64 bit PC.When I launched it on the Win7 PC it will open up OK but when I open a crystal report, the form page comes up ok but the report is missing.Then I get a pop up window asking me for a user name an PW:
[Code]...
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Dec 12, 2010
But I am facing problem Incase of vb .net .I am not able to add Ocx Control what should I do,
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Nov 9, 2008
I am using a backgroundworker to start ffmpeg and trying to use a progressbar.ProgressBar1.Value = e.ProgressPercentage does not seem to work probably because the way ffmpeg uses standard error to report progress. I think i could use the output text to do the trick. the output.Seems stream 0 codec frame rate differs from container frame rate: 1000.00 (1000/1) -> 29.92 (359/12) [code]
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May 17, 2010
I need to check if a label starts with a certain text, but it wont work!Here is the code I have:
Dim str1 As String = Label1.Text
Dim value As String = "abc123"
If str1.StartsWith(value) Then
'do something
end if
May I also add that the label i'm checking (the text inside it) has no spaces, i don't know if that makes any difference.
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Aug 17, 2009
I tried so many times to convert this to DO UNTIL LOOP unfortunately it does not work properly can you help me?
Heres: the code
CODE:
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Oct 31, 2009
i've got a problem here whereby my ctype doesn't work.firstly, to replicate my case briefly, i've created an extension of control class
[code]...
father.getheight 'compiler writes: Panel class doesn't support getheight, but I've already converted it to a Control with CType!end sub of course if i dim father as Control it works perfectly, but in my case father may be other objects as well that aren't controls so I had to dim father as a general object, is there a fix so i could properly convert father into a Control object?
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Dec 2, 2009
I'm using the IsBusy property to determine when a backgroundworker has completed. In the RunWorkerCompleted event I assing the result of the RunWorkerCompletedEventArgs to a public variable within the module where the backgroundworker events reside. The trouble is, the IsBusy property occasionally becomes true before the public variable gets assigned the value of the RunWorkerCompletedEventArgs. I experimented with putting a Threading.Thread.Sleep(10) after the IsBusy property becomes true and it seems to fix the problem. But it really doesn't seem right that I should have to do this. What is wrong here? I have placed the backgroundworker events in a component that is instantiated from the windows form, instead of placing the background worker events within the code of the form itself.
Here is my code;
Function SendAndWait(ByVal IntegerArray() As Integer) As String
Component.BackgroundWorker.CancelAsync()
Do While Component.BackgroundWorker.IsBusy
[code]....
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Aug 19, 2009
I'm working through a programming project, which should be quite easy but im stuck right at the start (relatively new to VB). I have a textbox (named textbox1) and a checkbox next to it. I want the checkbox to be ticked (.checked) when ever the value in the textbox is between 1 and 100, the checkbox to not be ticked when theres nothing in there, and for it not to be ticked when the value is < 1 and > 100. Figured a case statement would be the easiest. (this piece of code is just a validation check, basically in the real thing the user would have to enter in a value between 1 and a given number, and need to tell the user if that value is valid).
Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged
Select Case TextBox1.Text
Case Is = ""
[code]....
But what happens is, if I enter in the value 1 in the textbox, the checkbox becomes ticked, as it should. It tick with any values between 2 and 99 (any number not starting with 1) but the checkbox becomes ticked again when the value is 100. For any other range, say 1 to 70, the checkbox would be ticked if the value in the textbox is 1 to 7, or any number starting with 1 or 7, but not 8 or 9, or any number starting with 8 or 9.
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Feb 23, 2012
I found a class that saves column order and column width for a list view but i cant get it to work properly.
Public Class cListviewHelper
Private Declare Function ListViewiColumnOrder Lib "user32" Alias "SendMessageA" (ByVal hwnd As Integer, ByVal Msg As Integer, ByVal wParam As Integer, ByRef lParam As Integer) As Integer[code].....
It saves the right number of columns but not in the order they are.It always saves them like this in the registry "0,1,2,3,4,5,6"
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Aug 3, 2010
My project requires that a windows service checks up a table on a sql database(MDF) and if product existence is 0 then sends an email to some mail address and keep checking every 24 hrs.Now Im able to send mail messages but what Im not able is to make the service itself to work or at least make sure that is working.I do the following(correct me if I do something wrong or missing a step):
1. create a new project and choose windows service
2. add a timer and set to 4000 ms just to test not wait the 24 hrs lol
3. then open its event timer_elapsed and put some code on it, like a msgbox that would keep spamming every 4 secs just to test
4. at the event onstart I enable the timer by: timer1.enabled=true
5. at the event onstop I disable the timer by: timer1.enabled=false
6. right click then choose add installer
7. in the newer installed with the two objects:
a. serviceinstaller1 set its properties to: displayname: myservice and servicename: myservice
b. serviceprocessinstaller1 set account property to LocalSystem
8. build the project and install it by opening the VS console and type: "installutil c:path blah blahservice.exe" then hit enter
9. all successfull installed open the pc manager and run the service from the list and this should be the deal
Now my real problem is that by following those steps my service is sucessfully builded, installed, and started but after the 4 seconds no msg pops up so this leads me to think that is not doing anything or I did something wrong in the steps above. Is there another way to test if this service is working else than the msgbox or the log entry? Plus, Im working on my home pc which is a xp OS. I tried the same at college pcs wich are win7 and when I did install by the console it returned an error weird but in my home pc it doesnt(and I have to present my project at college at college and tomorrow
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Feb 18, 2012
i just want to know how i can make this program run proberly. if you import a file in the listbox and you wanne start it whit the process.start methode it won't work. here is my code:
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
OpenFileDialog1.ShowDialog()
[code]....
My question is how can i make the process.start work properly and will the program start the file?
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Jan 30, 2012
I wrote a program which is editing data from database. I used few tutorials (I`m beginer) and everything is working fine(I can make changes in datagrid). but when I`m trying to save changes made in dataset(e.g. save added record) I can not to that (there are no changes in my access database, but inly in datagrid)what is interesting when I delete record - changes are saved and record is deleted from db. where is my mistake? what is wrong? maybe some tips what can I improve in this small program?
[Code]...
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Dec 16, 2011
i add this values to listbox
6
7
15
6
[code]....
but in button function when i press the key is shows me this:
15
5
6
6
[code]....
code:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
ListBox1.Sorted = True
End Sub
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Dec 8, 2010
i am still new to using session state, i want to convert page name into and integer according to a database table a function then compares "X" and "Y" to check if a user have the right to view this page..i know this is not the best way of managing website security, but it is like "training on how to use the session".[code]
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