Create A Class That Is COM Accessible?
Sep 12, 2009
I am trying to create a Class that is COM accessible.The problem I am having is that I cannot have any arguments in the class constructor Sub New.If I do than I get the error:"MSB3214 does not contain any types that can be registered for COM Interop"I can however afterwards use regasm ComDotNet.dll /tlb to create the tlb file.
However when I try to use the class in VB (after adding the reference) withDim test As ComDotNet.HelloDotNetSet test = New ComDotNet.HelloDotNet("Hello")I get an error.
If I remove the argument from Sub New() everything works fine.
Here is the code:
Code:Imports SystemImports System.Runtime.InteropServices
Public Interface IHelloDotNet Function GetAge() As Integer Sub SayHello()End Interface
[Code].......
View 2 Replies
ADVERTISEMENT
Feb 28, 2010
I can't understand it..let me show you what i have first :
CODE:
and
CODE:
in ReportsOfficesEntities.vb:
CODE:
in BaseController.vb:
CODE:
And of course i added the references for both projects...
the error in BaseController.vb:
CODE:
I checked the whole code ..wondering if i am missing something ... nothing!
searched -->
1: maybe it is different a littel... i don't know
2:i am not sure if it is the same issue .. and it looks complicated to me..
note: i copy (Convert) that from C#.net project and it is working just fine in (C#.net)....!
View 1 Replies
Jul 7, 2011
I'll try to explain this the simplest way I can, and I'll be happy to provide more elaboration as needed.
I've created a class, class playership, as part of a little strategy game for my own practice.
I've created the instance of a playership object in my main form using the following [code]...
I'm a little confused about this because I thought a public object or variable could be accessed from anywhere within a project.
View 4 Replies
Nov 26, 2010
I have an issue with FxCop and the warning: Abstract types should not have constructors.This is being displayed for a number of abstract classes (possibly all, I haven't checked). When I look most of them have no new method so I assume it's the complier adding a default one. So to remove it I add a private default constuctor (Private Sub New()), this then means all the inherting classes fail to build with the error: Class 'InheritingClass' has no accessible 'Sub New' and cannot be inherited.This seems odd as FxCop requests no public constructor, but when I remove it the build fails.
View 1 Replies
Jun 24, 2009
In general, according to the OOP paradigm, my understanding of encapsulation basically says:
-If a member is private, it can only be accessed by the class.
-If a member is protected, it can only be accessed by the base class and any derived classes.
-If a member is public, it can be accessed by anyone.
If I have a nested class, can I declare a property to be accessible only to that class and the parent class it's nested within? For example:[code]In the example, I cannot directly access myNestedObject.myInt or myNestedObject.myDbl from an instance of ContainerClass if those members are Private or Protected. But suppose I don't want to make them Public,because then they are TOO exposed: they can be altered from anywhere, not just within a Container Class object. Declaring them Friend would still be too weak as that would allow them to be altered from anywhere within the application.
View 2 Replies
Apr 19, 2011
I added a serial port com1 to my vb.net form. I created a new class and wrote a method to open the com1 and created its object in the main form and called the method and its opening.THen i created another class wrote a method to write data to the com and same way created an object and called it but i am getting the error as port is closed. What am i doing wrong.
View 1 Replies
Feb 18, 2010
Hi
I've got a pretty general question about the best practice in passing an object reference to a Form in VB.NET. My form is a dialog and I've created an overload ShowDialog method, where I pass an Object into it ByRef.
The trouble is, I want to be able to refer to that Object throughout my dialog Class and not just in the ShowDialog method. For instance, some of my Events for controls on the form, need to reference that object.
I know I could create a local Private variable in the Class and assign it to the passed value, and then use that value. However I'm thinking this isn't very efficient because it would (I believe) create a new copy of the Object (which is a complex, large class in itself).
View 8 Replies
Mar 22, 2011
I want to create an IMAGELIST in a main form and add to it then have it accessible within a child form. I found several MS examples on database shared access but this is NOT the concept I am after. Straight forward:
Child_Form.<function_to_execute_in_child_form>(The_Passed_Imagelist)
So, within the child form it want to do whatever I like to the IMAGELIST! I have tried passing the object by reference and anything I could think of.
View 3 Replies
Oct 1, 2008
I've been creating short test apps repeatedly to try to understand some of the concepts in VB.NET.For the most part it has been illuminating.I read Bucky's .NET knowlegebase tutorial on passing objects as parameters to newly created forms. He shows how to create a new class that inherits from the base form class and define a New() method with parameters Extending the concept I thought about doing the same thing with a form that was created at design-time (In this case Form2).
[Code]...
View 6 Replies
Apr 27, 2011
I want to read a number of items from a file and then associate each of those items with a new button at run-time, so that when the user clicks one of the buttons I can display some information about that item.Can I use a LIST to manage these buttons and items? Can I create a new class and have each list item of that class, such as 'btnID', 'btnText', etc... ?
View 2 Replies
Feb 23, 2011
Can we create objects of a C# class from a VB.NET class and vice versa?
View 2 Replies
Jun 11, 2012
I want to create a class that will "search" for something. Basically I load up the "search item" when the class is created and inside the class is logic to do the "search". The result of this logic will be more "searches" that I want to start. How can I have the logic in the class create another instance of the class itself?
View 3 Replies
Nov 28, 2010
I want to create a class is it where I can do...
[code]...
How do I do this? Do i create a class and create a instance of CarData? but how do I add Color and Year etc to it?
View 3 Replies
Sep 10, 2008
I'm in the process of trying to create a class that will allow me to create windows shortcut; Im using the following PDF file that gives me the shortcut file structure.
Ive been able to successfully load a shortcut file and parse its Lnk File Structure but now Im on the Shell Item ID List structure but I cannot find the Structure of the ITEMIDLIST anywhere
Furthermore I know I could use the Windows script object, but this is a dependency Im trying to avoid if I can, hence writing my own Shortcut class.
View 2 Replies
Feb 27, 2011
I'm try to create a class has been create by main class only by protect sub New but how do I create it ?
Public MustInherit Class Rune
Protected MustOverride Function Create() As Rune
Public Shared Function Factory(Of T As Rune)() As T
'I can't use "T As {Rune, New}" because Sub New isn't Public
'Return (New T).Create
End Function
End Class
[Code]...
View 2 Replies
Jan 31, 2011
I want to create a custom class that has inside an array of another custom class (see my code below) but when the programm runs is crashes. Why? What is the right expression???? Plz help I'm a newbie in VB.net.....
Public Class ctrarray
Public nameclass As String
Public ctrlindex(glvar_spaces) As ctrlindexclass
End Class
[code]....
View 6 Replies
Jul 27, 2010
I have a class library written in .Net that I would like to make available to VB6/VBA. What I tried did not work (obviously as I am asking this question). Here is what I did:
I Created a Class Library Project in Visual Studio 2010 Express and put the code in a Class Module.I opened the project properties and went to "Assembly Information" and checked "Make COM Visible". I went to "Advanced Compile" options and targeted .Net 2.0 (it's very simple code).I then removed all references expect for "System".I built the project (no warnings or errors) and copied the DLL out of the Bin folder into C:WindowsSystem32 I ran RegSvr32 to register the DLL and got the error: The module "MyDll.dll" was loaded but the entry-point DLLRegisterServer was not found. Make sure that "MyDll.dll is a valid DLL or OCX file and then try again.
View 3 Replies
Jun 28, 2011
Is it possible to have method have methods that are only callable externally and never callable internally?
Public Class Foo
Public Sub New()
Bar ' Should fail to compile as Bar is only accessible externally.'
End Class
Public External Sub Bar()
End Sub
End Class
View 5 Replies
Mar 12, 2010
Can i make my files to be unaccessible ? Its in my project but no one should be access or view it.
I mean like this, when i include a picture on my project MS.Net will make a new folder and name it My Resources, however if im going to make it a installer i need to include the my resources folder and when its installed in a computer a locate the folder location the user can see the pictures. Or in other sample i put a shockwave files in my project and thesame make my installer i need to include it and when its installed the user can play that shockwave file.
Is there a way where i can includeall the files that i wanted to include but make it unaccessible ?
View 16 Replies
Jan 13, 2012
I want to create a helper class(.dll) but I 'm not sure how to create and when to create, what's its use and so on.
View 3 Replies
Sep 15, 2011
I want to share this tutorial for others so that we also an idea what they are suggest. This simple line of codes and Screenshot determines the invalid type required in textbox. I created my own class to control the invalid typing of data required in textbox. Example, the textbox required only a data that accepts all string input and if the user's prompt to input the numeric value, invalid message display that the field required only text input. Here is the site, just click
View 9 Replies
Sep 24, 2009
I used to do my coding without classes until the last few months and my best friends was my functions now when i started working with the .NET language I can understand how important it is to use classes, I can appreciate its values and and its many pluses.BUT I'm still not sure when it's time to create class for a certain task or start creating bunch of functions to handle my target.
View 5 Replies
Apr 22, 2010
I have a .exe program which has an embedded webservice running on port 800.I can access it locally via 127.0.0.1:800 just fine once the program is executed.I need to be able to send the service commands such as: * 127.0.0.1:800/dev * will get a list of devices attached to the program.
To my knowledge i need to forward port 800 on my router and then access my internet IP externally and I should be able to view/access this web service? am i correct?I am then wanting to create a PHP site which will send the desired commands back to the web-service running on my home pc.
View 1 Replies
Oct 23, 2010
As a learning experience I decided to try and implement the Shunting Yard Algorithm(string calculator) using OOP. It was successful for as far as I took it, but it had one flaw. In order to get the stack to be accessible from the operators I had to declare it as shared, which meant that all versions of the calculator shared one stack. This very short piece of code illustrates what I came up with and the "flaw". [code] How can I maintain the functionality of anOP.add1 without declaring "something" as shared?
View 9 Replies
Aug 12, 2009
I am doing a form (in vb.net) to store patients details. I have created that one is before 2 months. But right now when am trying to access the keyevents of textboxes and finds its not working. I have type a message in txtboxe's keydown, keypress and keyup but nothing is happening.
View 4 Replies
Jul 22, 2009
So what does this mean and how do I fix it? This message occurs if I place the New keyword in the line(s) below. If I remove it, i get an error at runtime saying I need to use New. What am I doing wrong? Code:
View 4 Replies
Jun 5, 2012
I've created a Http Server in VB.net.I've used the same "template", I guess you could say, for every project requiring an Http Server (quite a few recently).The problem is, this one I'm working with now requires that the computers on the LAN be able to connect to it. I can access the server directly from my computer though using: [code]Now I get an error every time when it tries to apply the prefixes: I've checked all the ports that are listening and 8002 is still open...
View 2 Replies
Mar 19, 2012
I want to create a class in vb.net that make the connection to database.Also I need the way to use this class inside forms. I need a code example of both the class and the form call
View 1 Replies
Feb 28, 2012
I have recently been working with creating a GridView from codebehind to make it more flexible so that I can eventually have it created based on user specifications.Now I'm exploring classes, and I thought it would be cool to create a GridView class so that whenever I need to make a GridView I can just pass the class my specifications instead of having the same code re-written on each page's codebehind.Here's how I'm currently making my GridView with codebehind. Any idea how I can change this to create the GridView with a class?
.aspx page:
<asp:GridView ID="GridView1" runat="server" AllowSorting="True" AutoGenerateColumns="False"
EmptyDataText="There are no data records to display." AllowPaging="True"
CssClass="GridViewStyle" GridLines="None" Width="100%">
[code]...
View 1 Replies
Feb 18, 2012
I have this code which i got from another forum.[code]...
View 2 Replies
