.net - Error Exposing Event Through Interface?
May 19, 2010I have this interface
Interface IProDataSource
Delegate Sub DstartingHandler(ByVal sender As Object, ByVal e As EventArgs)
Event starting_Sinc As DstartingHandler
[Code].....
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RE Exposing COM Interface To .NET?
Jun 29, 2010Is it possible to create a VB6 interface that can be implemented in a .NET class? I have the need to call a method in an existing VB6 class that behind the scenes will call either a VB6 or .NET class that utilize the same interface.
MyObject.Type = "clsVB6"
MyObject.DoSomething(intID)
would behind the scenes be utilizing a VB6 class that implemented a 'DoSomething' VB6
[code]....
C# - Exposing Property As Variant In .NET For Interop?
Feb 28, 2012I am creating a wrapper class in .NET (VB.NET as it happens but is equally related to C#) that is exposed to COM and one of the properties I am trying to wrap is a Variant. I thought I would just be able to use an Object, but I get an error: Public Property FieldValue([vFieldID As Object = -1]) As Object cannot be exposed to COM as a property 'Let'. You will not be able to assign non-object values (such as numbers or strings) to this property from Visual Basic 6.0 using a 'Let' statement.*
My property declaration looks like this:
Public Property FieldValue(Optional ByVal vFieldID As Object = -1) As Object
Get
[code].....
Exposing A Supporting Class From A Usercontrol
Apr 8, 2010I have a supporting GridColumn Class that resides in the same class library project as my GridBox usercontrol.It is used in a list of GridColumns as a property.[code]In the Load event of my form I would like to use the .Add method of the List(Of GridColumn) to add columns to the usercontrol.[code]It will not work though because it cannot find the GridColumn class.If I use: "Imports <My Class Library Name>" it works, but I would like it to work without having to do so.Standard controls do this all the time.Am I putting the supporting class in the wrong place?Is there a modifier I that will expose the class when the usercontrol is dropped on a form?As a work around I created a method that adds a column but I would like to know in any case.
View 9 RepliesExposing An Enumeration Through COM That's Declared In A Different Module?
Mar 15, 2011I have a .NET library that needed a COM wrapper around it so it could be called from VB6ish programs, in this case specifically Microsoft Access XP I have a type that's declared in one of the classes that went into the .NET library. I thought since its public, it would be seen, but it didn't show up in Access. And yes, we made the TLB file and registered the COM interface. I had to move the type declaration into the COM module, which I really didnt want to do. Is there a way to export a type/enum through COM without actually declaring it in the COM interface Scott Berger McCormick Systems
View 3 RepliesConvert An Interface's Event To C#
Mar 24, 2010I'm struggling to convert the below code to C#.
Class Class1
Implements IMyInterface
Public Event MyEvent(ByVal sender As Object, ByVal e As MyEventArgs) Implements IMyInterface.MyEvent
[Code]....
I'm sure I can find out what to replace the NotImplementedException parts with but VS is still telling me that the definition is not implemented anyway.
VS 2010 : Exposing An Instance Property As Shared?
May 24, 2010Suppose I have a class of objects called Porky with a property called IsHuge:
Public Class Porky
Public Property IsHuge As Boolean
End Class
Now I want to make a special kind of Porky -- let's call it UberPorky -- for which I want to change ALL instances to either IsHuge or not IsHuge. What I'd like to do is this:
Public Class UberPorky
Inherits Porky
Public Overrides Shared Property IsHuge As Boolean
[code]....
The trouble is, I can't do that. I'm not allowed to reference MyBase or Me in a Shared property.
VS 2010 Exposing Picture Box Drawing Surface?
Dec 27, 2010studying GDI+ for drawing, there are many suggestions to expose the graphic surface for the paintbox control or a form using e.graphics in the paint event. Can graphics be exposed outside the paint for the picture box control?
In my old vb6 project that I am converting to vb.net 2010, I have several large routines located in a code module that draw lines, circles, etc on a picture box and it is desirable to keep these outside the paint event of the picture box so the same routines can be used to draw on more than one picture box.
In experimenting, I found I can create e.graphics from the picture box paint event and pass it by reference to a drawing routine and the drawing routine seems to work ok on initial experiments but it requires visiting the picture box paint event to get the drawing surface in the external sub.Is this apprach good programming practice or is there a better way to create the graphics surface of a picture box or form in subroutines outside the paint event?
Asp.net - Define Event Handlers In An Interface?
Nov 12, 2010I am making an interface that has a number of events defined in it. When I implement the interface in a class the events will show up. I want to force a class that implements my interface to also have to make the event handlers too. I don't care where the class raises the event, but I want them to have to define what happens once the event is raised. Is this possible and if so, how do I do it?
View 1 RepliesEvent Logic And Phidget Interface?
May 7, 2010I have a Phidget Interface board that has 16 digital inputs. When I trigger an input it fires an event. The problem is that the event fires twice because it fires when the input goes high AND when the input goes back low. I just need it to trigger once per input state change (Input to high and input back to low = 1 button press There are 10 types of people in the world: those who understand binary, and those who don't.
View 5 RepliesHow To Raise Event In Mocked Interface
Jan 31, 2012I'm trying to raise an event in a mocked interface. I can get this in C#, but for some pain-in-the-butt reason can't get it working in VB.Net. Hopefully I haven't missed the boat conceptually and all I'm missing is some syntax. This is similar to the code I'm working with:
Public Interface ISendable
Event SendMessage(message As String)
End Interface
''**********
Public Interface IPrintable
Sub PrintAnnouncement(announcement As String)
[Code] .....
How to complete or correct the line in my test class that begins "sendable.Raise..."? Maybe there is more setup I need to do, but the Moq site didn't seem to indicate this is the case.
Implement An Event Defined In An Interface?
Jul 13, 2010I defined the following interface:
Interface INewFileDetector
...
roperty PollIntervalMsec As Integer
[code].....
Implement An Event Interface Defined In A COM App?
Sep 21, 2011I need to implement an event interface defined in a COM app so I can get events. I want to use System.Runtime.InteropServices.ComTypes.IConnectionPointContainer. In Adam Nathan's ".NET and COM", Adam shows some C# code that connects to an IE event set. There he does this:
[Code]...
Compiling And Running Code Dynamically / Exposing Objects From App
Jul 19, 2011I am trying to add some scripting to my VB.NET 2010 Windows Forms Application.I have figured out how to compile and execute VB.NET code stored in an external script file from within my app using Microsoft.VisualBasic.VBCodeProvider.CompileAssemblyFromSource and InvokeMember. I can also pass and return parameters to the code in the script file.In VB6 using the VBScript Host control, I could expose instances of objects in my app to the code in the VBScript.How do I do this in VB.NET?I'd like to expose a form object (the main form for my Windows Forms Application) to my VB.NET script.I don't want to pass the form as a parameter via InvokeMember.[code]
View 3 RepliesInterface And Graphics :: Calling The Paint Event?
Mar 22, 2012This is a working example which draws a rectangle on different location every timer_tick and I fully understand now how it's working:
Code:
Dim i, timercount As Integer
Private Sub PictureBox1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles PictureBox1.Paint
[code]....
Now I'm looking for a way to draw this rectangles without refreshing them every single tick. I've just started using Visual Basic and I really don't know how to call/raise PictureBox1_Paint event every timer_tick or how to store drawing data in member variables?
Interface And Graphics :: ToolStripMenuItem Event Handler?
Sep 3, 2011In my Main class I have this event which as you can see simply closes the form. It is triggered from a ToolStripMenuItem called miExit.
Code:
Public Sub miExit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles miExit.Click
[code].....
Why Can't A Sub Implement An Interface And Handle Event At Same Time
Apr 12, 2011Why can't a sub implement an interface and handle event at the same time? The following gives my a syntax error:[code]I know I could handle this kind of logic with another method, but that is not the point. I just want to understand the reasoning behind this.
View 2 RepliesWCF Service Generated Proxy Class Exposing Function As ByRef Sub
May 23, 2011I have a WCF Service exposing a single contract and operation:
<ServiceContract(Namespace:="ImageSystem")> _
Public Interface IUploadService
<OperationContract()> _
[Code].....
This subsequently leads to stream casting issues, because the generated function allows me to pass a memory stream as an input (which works correctly when passed through to the service), but instead of passing me back a new stream for the response, it attempts to cast the MessageBodyStream received from the service into my memory stream.
This is, in some ways similar to other posts but as you can see, there are no enums involved in my contracts - presence of Enums caused strange proxy class generation is marked as the answer in the similar post.
Is there anywhere I configure the proxy behaviour to use the contracts I've specified? Clearly I'm within a dev/test environment currently, but when this eventually goes to production it will be memory and file streams passed to the service, and the returned stream can be in any format to be honest, I intend to treat it as the abstract stream class. The only way round this I can see right now is to change my in stream to be the same as the anticipated out stream, but surely there is a better way?
.net - Conversion To C# - Interface Event Declaration For Non-EventHandler Events
Nov 24, 2009Ran into this while converting a VB.NET interface to C#; the VB version defines an event which doesn't conform to the typical (object sender, EventArgs e) signature:
[Code]...
Call An Event On An Object That Originated In An Interface From Another Location
May 23, 2011How can I raise an event from another class which implements an interface that contains an event?
Public Interface IMyEvent
Event MyEvent()
End Interface
[Code].....
Note the comment - that code doesn't work. How can I raise an event like this, if it's contained within another class through an interface?
Interface And Graphics :: Add A Click Event To A Graphic Line?
Jul 29, 2009In a application i'm working on i need to be able to select a graphic (a line to be specific) and then i need to change or move it but i cant find how to add a click event to the line when a draw it. Basicly i want to click on the line to select it (make it fatter or an other color) and then be able to alter it in position and size (lenght). Is there any way or what is the correct way to do this?
View 6 RepliesInterface And Graphics :: Looping A Paint Event Run On A Timer
Nov 20, 2009I've got this code which draws a line and it moves down to a point then two curves are drawn coming off of it. I need to get it to repeat itself after a short period, so there's a constant flow of lines moving down then becoming curves.[code]
View 3 RepliesInterface And Graphics :: MouseLeave Event Detect Left Leave?
Oct 8, 2009Is it possible to detect a mouse leave to the left. For example: I have a label and when I hover over it the text changes to "Hovering", and when I leave the label from the left I want the text to change to "Exit left" or if I leave the label from the right that text changes to "Exit right".
View 1 RepliesInterface And Graphics :: Resize Event Not Fired When Form Loads?
Nov 4, 2009Back in the VB6 days, I could count on frmWhatever_Resize() to be fired when a form is loaded. That doesn't still seem to be the case. Since my resize event is filled with all the code I want that adjusts the size and placement of things, I decided to just call it from the end of the form's load event. That has no affect. I'm guessing that the form isn't actually shown until form_load is finished?
is there some other event that is fired when a form is shown, so I can call my resize code there?
AccessViolationException Error When Trying To Interface With Third Party Dll?
Dec 28, 2011The error message that I've been getting for the past few months when trying to access functions of a specific third-party .dll using vb.net is this: "An unhandled exception of type 'System.AccessViolationException' occurred in test.exe Additional information: Attempted to read or write protected memory. This is often an indication that other memory is corrupt."
I've been researching this error message, and I have come to know that it is likely due to either attempting to access memory that isn't available or due to "enhanced" security features.I am trying to access a third party .dll. The functions in that .dll all deal in one way or another with Handle types (either returning them or accepting them as parameters). I understand that handle's can be essentially pointers to pointers (pointing to an entry in a memory table, which is itself a pointer), and I also understand that handle's don't, strictly speaking, exist in the .NET framework, but I do understand that through some combination of IntPtr's and possibly the Marshal class, they can be dealt with.
I don't believe vb.net's lack of a Handle type is the problem, because the dll function that I am calling, which on success returns a handle, returns a number <= 0 if the ip address it is searching for is not found, and the ip I specified doesn't exist. Also, the error really only occurs when executing the code from within the the Visual Studio environment. I compiled the executable and ran it 77 times(literally), and I only got the error on the 77th try.
I'm trying to find out all I can about this error. I would like to completely eliminate it. Could the error come as a result of something happening within the dll itself? The function asks for an ip address, and the ip address I have specified doesn't currently exist on the network, but as far as I know, the function handles that by returning a number less than or equal to zero. I am very confused as to what the problem could be. I have successfully interfaced with .dll's before. I've read about the hotfix for .NET 2.0 regarding this error message,but I'm a little skeptical. I've tried everything else I can think of, though, so I may give that a shot.I'm 100% certain that:
-I am calling the correct function within the .dll
-I am using a signature that matches the signature of the function
-The error has nothing to do with User Account Control.
The code is very simple to try to isolate the issue:
Imports System.Runtime.InteropServices
Module test
<DllImport("3rdparty.dll", EntryPoint:="#12")>[code]......
Error Message: No Such Interface Supported
Apr 14, 2010A client used to work on a desktop application which i have developed a while ago. Recently, his computer got 're-imaged' by the IT department. After that, the application starts crashing at line [Code] giving an error message "No such interface supported". i am using vb.net 2003 and access database. also there is a password on the database file.
View 5 RepliesGet Error 80004002 - No Such Interface Supported
Mar 14, 2011On a client's computer I get error 80004002 - No such interface supported.
I am using Vb.Net 2010 to open an Access 2007 database. On my computer the connection works perfectly so it cannot be my coding or it would not work at all. On the client's computer I unstalled a version of my program that was working and installed the latest version of and the error started.
Word 10 Interface Error 'that Method Is Not Available On That Object'
Jun 28, 2011Does anybody know why I get the error 'that method is not available on that object' when I try to interface with Word 10? Our software works fine with Word 7 and previous
View 1 RepliesInterface And Graphics :: Listbox Event - Scrollbar That Comes With ListBox Is Too Small For Touch Screens
Jan 6, 2011The scrollbar that comes with the ListBox is too small for touch screens, so I use my own scrollbar instead. But when you do this on various forms you end up repeating a lot of code. So my solution was to create a custom scollbar that has a property I can set to the control I want it to be a scrollbar for. In vb6, I can use the withevents keyword to get access to the control's events so that all the scrollbar related code can be in the custom scrollbar object I created, except...I had to create a refresh method for the consuming code to use to let the scrollbar know when the number of items changes. The scrollbar doesn't need to be told how many items there are because it has access to the control, but for a listbox there is no event to tie into when an item is added/removed so not 100% of the scrollbar related code could be encapsulated.
View 2 RepliesError: Interface 'System.Web.Mvc.IValueProvider' Cannot Be Indexed Because It Has No Default Property
Nov 19, 2009This used to work.
<AcceptVerbs(HttpVerbs.Post)> _
Function Widget(ByVal collection As FormCollection) As ActionResult
...
If ... Then
[code]....
I upgraded to ASP.NET MVC 2 Beta and ASP.NET MVC 2 Futures Assembly for Beta and now ToValueProvider() fails with this compile-time error: Interface 'System.Web.Mvc.IValueProvider' cannot be indexed because it has no default property How do I use ModelState.SetModelValue() if not with collection.ToValueProvider()?