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Hi, I was just wondering if there was a way to add classes to an ArrayList and access the subs/functions within the class from the ArrayList?
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GBH_Badger wrote: I was just wondering if there was a way to add classes to an ArrayList and access the subs/functions within the class from the ArrayList?
I don't really understand your question. Do you mean you want to derive a new class from ArrayList? That is certainly possible.
My: Blog | Photos
"Man who stand on hill with mouth open will wait long time for roast duck to drop in." -- Confucius
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The following code will not work, but you see what im trying to accomplish.
Puplic Class Test
Public Sub RunTest
‘Do Stuff
End Sub
End Class
Public Class Main
‘This can be done.
Dim AL as New ArrayList
AL.Add (Test)
‘This dosent work as the sub is not exposed.
AL.Item(0).RunTest
End Class
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Oooops, missed a sub there  Still wont work though!
Puplic Class Test
Public Sub RunTest
‘Do Stuff
End Sub
End Class
Public Class Main
Public Sub RunMain
‘This can be done.
Dim AL as New ArrayList
AL.Add (Test)
‘This dosent work as the sub is not exposed.
AL.Item(0).RunTest
End Sub
End Class
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Like Colin said, you first need to cast the item:
DirectCast(AL.Item(0), Test).RunTest
Dean
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The sub is exposed, but you have to cast the return value of AL.Item(0) to get at it.
You can also make a strongly typed collection. See this article[^] for details and an example of how to do that in VB.NET. (Note that in .NET 2.0 this will no longer be necessary because the language supports generics)
My: Blog | Photos
"Man who stand on hill with mouth open will wait long time for roast duck to drop in." -- Confucius
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OK, here is a very basic version on the code im using. Basically im using projects and need to be able to run them randomly. I started using project files (Stored in an ArrayList) and sent the project to a class which was then placed into another array and run. I then decided that I would need to pass back to much information to the project ArrayList and the GUI everytime the project was updated. I need a way for the projects to run (ie not creating project files, creating new instances of classes and saving them to disk using Serializable formatters). My actual code will need lots of events and it is a net based application and involves downloading, etc.
Still cant get the following code to work correctly. If anyone else has a better way of doing this I would be happy to dicuss it. (also im only really a hobby coder. this would be my first real application )
Public Class TestMe
Dim TestCls As Test
Dim AL As New ArrayList
Public Sub Init()
TestCls = New Test
AddHandler TestCls.onDone, AddressOf _onDone
AL.Add(TestCls)
DirectCast(AL.Item(0), Test).lngValue = 1000000000
DirectCast(AL.Item(0), Test).strName = "Test One"
AL.Add(TestCls)
DirectCast(AL.Item(1), Test).lngValue = 10000000
DirectCast(AL.Item(1), Test).strName = "Test Two"
End Sub
Public Sub RunTest(ByVal intValue As Integer)
DirectCast(AL.Item(intValue), Test).RunTest()
End Sub
Private Sub _onDone(ByVal StrName As String)
MsgBox("Done " & StrName)
End Sub
End Class
Public Class Test
Public strName As String
Public lngValue As Long
Public Event onDone(ByVal StrName As String)
Public Sub RunTest()
Dim intCounter As Long = 0
Dim X As Long = 0
'Do Long Process.
For intCounter = 0 To lngValue
X = X + 1
Next
RaiseEvent onDone(Me.strName)
End Sub
End Class
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Excepción del tipo 'System.InvalidOperationException' en system.windows.forms.dll
Información adicional: No se pudo cargar ImageList.
Excepción del tipo 'System.Reflection.TargetInvocationException' en mscorlib.dll
Información adicional: Se inició una excepción en el destino de la invocación.
<br />
Me.iconImg.ImageSize = New System.Drawing.Size(16, 16)<br />
Me.iconImg.ImageStream = CType(resources.GetObject("iconImg.ImageStream"), System.Windows.Forms.ImageListStreamer)<br />
Me.iconImg.TransparentColor = System.Drawing.Color.Transparent<br />
I need aid I cannot do nothing, thanks of before hand.
nothing software
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I have tried to pass a variable from User Control to others windows form. I used a textbox in windows form to show the variable. However, the User Control seems like not passing anything...
Can anyone help me to solve this?
Thanks a lot
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The principle is exactly the same as passing between forms as a form is just a particular type of object. Form also derives from Control, as does User Control.
Here's the article: Passing Values between Forms[^]
My: Blog | Photos
"Man who stand on hill with mouth open will wait long time for roast duck to drop in." -- Confucius
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I'm appending to Colin's post. Yes, UserControls can pass data just like form to form, but, you're violating encapsulation rules. A UserControl should not know anything about the form that it's sitting on. It should not care about any other controls on the form that it's sitting on.
Expose the data as a property of your control and let the form code grab the data and update other controls on the form for your control. This allows your UserControl to be reused on other forms without you knowing that you have to have certain other controls on those forms that are required by your control.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Thanks for help... i solved my problem..
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sir,
i have configured vss server ans clients and database also created but iam unable to connect from client to server database what should i do to connect
the error is unable to connect database log files , otherwise how to create log files in log files in data files
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Hi, does anyone know how to get folder permission in vb.net? For example i have a folder c:\myfolder and to use vb.net to get an information of what kind of permission that user have access on it.
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Only .NET 2.0 has the permissions stuff encapsulated in the Framework. .NET 1.0 and 1.1 don't. But, there are 3rd party libraries that do encapsultate this stuff for you. Check out this[^] article for a couple of them.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Dave, thank you very much for your comment. But the code is written in visual studio .net. Is it possible to work in VBA in Ms. Access application. Because i need to export some query data into backup file and export other other safe place, so I need to check the permission of the target folder whether i could create the file or not. That is why i need to check the target permission with the current user log on. Any idea?
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How about just trying to create the file and catching the UnauthorizedAccessException when it fails?
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Yeah, this is a good solution too. I will try to do it on that way. Thank you very much dave.
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No prob, but I'm not Dave...
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Oh, I'm sorry ROBERT, because the post is a little bit quick so I didn't look at your name correctly. Thank you again ROBERT.
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You should have specified you were using VBA for Access in your post. There are a few VB6 examples that exist for playing with ACL's on files and folders.
But Robert is correct. In your case, this is a grossly convoluted method for checking to see if you can write a file to a folder. All you need to do is try to create it. If the user running the app doesn't have the permissions, it'll error out and you just trap the error with On Error Goto label or On Error Resume Next code.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Dave Kreskowiak wrote: You should have specified you were using VBA for Access in your post
I'm sorry that i forget to tell about this information.
Dave Kreskowiak wrote: There are a few VB6 examples that exist for playing with ACL's on files and folders.
Do you know its website? I need to read about it and test on my system. I already use google to search for it but there is no result.
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Hey All,
I stuck with very little but (big for me) Problem
I want to add the status bar panels in right to left direction
Means My 1st panel at the rightmostside of status bar then 2nd & 3rd so on.
By default the panels add at the left side
How to make that at right side aligned.
Thanks in advance
Hema Chaudhry
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How can I make an .EXE file ? for example, I creat a vb.net program that allow to type custom message on its text box. Then after click a "Make an EXE" button, a new .EXE file will be compiled and created. Of course, that new .EXE file will have the code : msgbox(Custom Message)
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I don't understand what you want. You ask a question then provide the answer.
My: Blog | Photos
"Man who stand on hill with mouth open will wait long time for roast duck to drop in." -- Confucius
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