Interface In A Function Or Similar Verification For An Object?
Sep 6, 2010Lets say I have function returns an object and that object has 10 properties. for example
myStudent.ID
myStudent.Name
myStudent.Surname
[code].....
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Mid Function In Java - Similar To VB?
Feb 2, 2012In Visual Basic I used to use the Mid function to loop through a string and examine each character, i.e. like this:
[Code]...
Question is, how would I go about doing something similar using Java?
Use A Function In Vb Similar To Vlookup In Excel?
Jun 22, 2012een using excel extensively. In excel I use vlookup function to connect and retrieve data from other workbooks. I want to know how I can do it in VB. So far I have created a form.The form has say three text boxes viz (i) A unique Number (ii) Name (iii) Address. I want that when I write the unique number in the text box for unique number the other two text boxes i.e. of Name and of Address should be auto populated. I have also established and tested the connection with the access database file using ADO.NET. I do not know whether I need to write an SQL or LINQ query for this purpose or I should write some codes. What should i do it and how should i do it?
View 5 RepliesInterface And Graphics :: Link A Class / Object To An Interface?
Apr 21, 2010I'm trying to make a .dll that contains a lot of basic functionality that a program can use. Currently i am trying to use interfaces to make a lot of this functionallity independend of the program using it but i hit a snag. The Basic idea is that a programmer will create his own object using the interface discribed in my .DLL file. Then implements those functions as he likes. He can then instanciate a controller (found in the same DLL) and sends his custom object implementing the interface to that Controller. The controller can then be started and will take over all the work. I do not know what type of object is send to the controller and idealy i want to program it in such a fashion that i shouldn't care as long as the object send implements that interface.In code I am trying to achieve the following: (quite simplyfied)
.Dll:
Code:
Public Interface MyInterface '<----Decleration of the interfaceFunction GetData() As Integer
Function SetData(Data As Integer)
end interface
[code]....
this propperly. I know that the second i set the interface adaptor in the Controller VS comes nagging that it can not be converted to a "MyInterface" Class. Obviously i am doing something wrong. I can change the datatype that the controller expects to the "MyController" type but that would completely ruin the whole idea of flexibillity. I am hoping someone sees what i am trying to do and can point out where i made the thinking error.
Make A DataGridView Similar To An Excel Function?
Jul 2, 2010I am trying to essentially convert an Excel spreadsheet into a Windows Form. On the first worksheet I have setup an IF statement to work as a search function =IF(C10="","",VLOOKUP(C10,'Price List'!$A$2:$D$40008,2,FALSE)) to read a price list on a separate worksheet. It works by taking a partnumber then puts the description in the next column (description column) and then the price in the "price each" column then finally totalling the row based of the quantity selected (see below).[code]...
View 11 RepliesTest To See If One Object Is Similar To Another Without Testing Each Property?
Jun 9, 2011Object.Equals I can understand but has anyone got or written an Object.Similar function? I want to test every property and value of two objects to see if they are similar or not,I can understand we can have say two red Ferrari cars but they can not occupy the same space in the same universe!!However they could look similar / identical in every other aspect. I know two cars don't make one object so they are NOT equal.In a similar fashion at run time we could put two Button1 buttons on a Form but they could have separate locations. I want to test two objects that only have the PROPERTY of color or a set of other similar simple properties.How can I test to see if one object is similar to another without testing each property,[code].....
View 15 RepliesVS 2008 : Make An Encryption Similar To PHP's Crypt() Function?
Feb 8, 2010If I'm not mistaken PHP crypt() function use DES-based encryption algorithm. So I've search DES Encryption code and all that I found is code that similar to the one in this post http://www.vbforums.com/showthread.php?t=471798
But with those codes I must enter 8 character lenght salt. Less then that the code wouldn't succeed. In the other hand. The PHP crypt() function only could use 2 character length salt. If you enter more than that, it seems it only use the first 2 character..[URL]
In .net, If A Function Returns An Object, Is It Wrong To Just Use The Function, _as_ An Object
Apr 30, 2009I've got a f(x) that returns a collection of user controls. .Net lets me just treat the f(x) name as the collection.
ex)
Private Function GetCcB() As Collection(Of Reports_ucColumn)
Dim cc As New Collection(Of Reports_ucColumn)
cc.Add(Me.ucColumn0)
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C# - Function Or Interface Marked As Restricted Or The Function Uses An Automation Type Not Supported In Visual Basic?
Oct 19, 2010What does this error mean in VB6? Function or interface marked as restricted, or the function uses an Automation type not supported in Visual Basic.
I keep getting it when i call a particular method of a dll that comes with windows xp and beyond (in system32 called upnp.dll)
Manage A Large Number Of Similar Controls In A User Interface (such As Button Or TextBox Controls)
Aug 23, 2011There is newer code in a follow up post. I suggest using the code in the later post rather than the code in this one. You can still read this post though. When designing a user interface, one should be conscious of how many individual controls are required to implement the functionality. In some cases an initial design may begin with many buttons or textboxes (for example) but then further review of
the actual required functionality allows for a reduction in the number of unique controls.
But other times, there isn't a better way (which will still make sense to the user of the application) then to have a series of many repeated controls. So in the cases where one can be certain that the best UI implementation for an application will require the use of multiple copies of a given control, then it often becomes necessary to maintain some method of managing all of those controls at various points
throughout the application. Doing so typically requires that one build up some collection of controls which can then be accessed by index in order to work with any given control; but this can lead to a lot of clutter in the code file which handles these control's events. For instance there will be some kind of collection declaration, some recursive routine to find all of the controls of interest, and then any number of event handler methods with long lists of Handles clauses, or additional code loops to wire up the event handling for each control.
Purpose Since most of this functionality could be considered a requirement regardless of the type of control being managed, or its required functionality, it may make sense to wrap all of the control management functionality into a single class. And since our first requirement is a collection of controls, then a base collection class could be the perfect starting point for our control manager. There are a number of existing thread around this topic, with some recent (at the time of this writing) ones being:[URL]..In this, and related, threads I have posted examples of a simple TextBoxManager and ButtonManager control. But again, with so much similar functionality required regardless of the control being managed, it would be technically possible to create a generic ControlManager(Of T As Control) class which can manage any type of control.
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So in summary, one can facilitate managing a large number of user interface controls by building a "control manager" class which both encapsulates the list of control instances, and deals with adding and removing defined event handlers for every control it manages. The generic control manager class itself can be inherited and extended into a more specific class on a per-application basis in order to provide more application-specific functionality. Reed Kimble - "When you do things right, people won't be sure you've done anything at all"
Whiteboard/Chat App - Make A Desktop App That Will Be Similar To The Doodle Function In Yahoo Messenger?
Jul 28, 2009Im looking to make a desktop app that will be similar to the doodle function in yahoo messenger but with a loaded background image to draw on. I was thinking of using a P2P/IP chat on the side.Im just starting with vb most of my coding has come from actionscript
View 3 Replies.net - Interface Variables (ie Dim X As Iinterface = Object?) And Also If Object Is A Form?
Mar 10, 2010I've got 3 forms that have exactly the same functions, so I decided to create an interface.
public Interface IExample
public sub Add()
Public sub Edit()
[code]....
At this point, objfrmExample is now instantiated, even though I've not done a "objfrmExpample = new [what-goes-here?] " and I'm curious as to why.I could possibly guess that because you cannot instantiate an interface variable, then vb.net automatically creates an instance. But thats just a guess. The question is , what is meant by declaring a variable of type Interface, and how does it work?
Return An Array Of Object Interface's Rather Than An Object?
Mar 4, 2009I have an interface that describes an specialized list in my application...
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Is there a way to make an interface serializable, or am I going to have to convert each of my objects into a concrete class implementing the interface, and then return that class?
Can A Generic List Of T Be Passed To Function Similar To Way An Array Is Passed?
Mar 23, 2012I want to pass a List of T where T is an object I've created that has about ten properties (strings, dates and integers).The lst passes to the function successfully. I am also passing an New T of the Object (itm as T).I can see all the values (see image below), but because it's generic I cannot seem to retrieve the property values and I cannot figure out how to iterate through the properties of each itm as they are retrieved in the For Each.[code]
View 10 RepliesFunction - Pass Object Versus Reference Object In Parent?
Dec 1, 2011I am working on a application that has quite a few functions involved and have been thinking of the following: If I have a function that has a few paramaters, is it more efficient to pass the objects to the function(Example 1) or reference the objects in the parent(Example 2)? Does it matter if the objects are large or not?
Example:
Class mainform
Public myGenericList As New List(Of String)
Public myDatarowArray() As DataRow
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Object Reference Not Set To An Instance Of An Object When Calling A Function
Jun 13, 2012I call the function GetDataTable and when it gets to the return line, I get the error message: Object reference not set to an instance of an object.
Dim DB As New DBConn
Dim gd As New DataAccess.GetData
Dim DT As New DataTable
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Updated. I'll see if I can update with the DataAccess.GetData code. I didn't originally put it in there because our shop use it all the time and have no issues with it.
Use In .net A Function And An Interface Created In C#?
Oct 1, 2011I'm trying to use in vb.net a function and an interface created in c#. The function is RegisterDragDrop and the interface is IDropTarget:
Public Shared Function RegisterDragDrop(ByVal hwnd As System.IntPtr, ByVal pDropTarget As GongSolutions.Shell.Interop.IDropTarget) As Integer the second parameter points to an IDropTarget interface.
I'm implementing this interface in vb.net as follows:
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Interface Function That Returns Plurality Of Self?
Dec 5, 2010I have just received some documentation for an Interface and a class implementation, and I had a question about the return type defined in the interface. here is the function from my interface (I have abbreviated the parameter list in the SearchAddress function).my concern is the SearchAddress function.
Public Interface IAddress
Property AddressID As Long
Property AddressTypeID As Long
[code].....
Casting An Object Through An Interface (.NET 3.5)?
May 14, 2010I have an object that inherits from an interface. I can create and return the following:
Dim o As IRequest
o = New Request
Return o
This works fine. Now I want to return a List(Of Requests), so I try the following:
Dim o As List(Of IRequest)
o = New List(Of Request)
Return o
The error below is being given on o = New List(Of Request)
System.Collections.Generic.List(Of MyObjects.Request)' cannot be converted to System.Collections.Generic.List(Of MyInterfaces.IRequest)'.Consider using 'System.Collections.Generic.IEnumerable(Of MyInterfaces.IRequest)'
Cast A List Of Object To List Of Interface That Object Implements?
May 19, 2009I am working in VB.net and have a Class, Foo, that implements an interface, IBar.I have a List of Foo's, but I need to pass a list of IBar's into a function, but I keep getting casting errors, even when I use DirectCast.My code is [code]MainWorks works, but it would be really annoying and inefficient to have to do that everywhere I want to call this function.
View 4 RepliesC# - Implementing An Interface Then Calling The Initialize() Function?
Sep 30, 2011this wont be easy to explain clearly but here goes..i have something that works fine in VB but not in C#.i have 2 classes, each class implements a different interface. each interface exposes an Initialize() function that should get called automatically when the plugin loads. since each class has an Initialize() function, i can watch both functions get called in the log. this works fine in VB.
when i do this same thing in C#, only the Initialize() in the first class gets called. anyone have a clue as to why this might be happening?
[Code]...
as you can see the code is identical in both languages. why does it work in VB and not in C#?
Pass A Generic Type Not Having A Interface To A Of T Function?
Jun 8, 2009I have a following code which works fine
MsgBox(AddSomething(Of String)("Hello", "World"))
Public Function AddSomething(Of T)(ByVal FirstValue As T, ByVal SecondValue As T) As String
Return FirstValue.ToString + SecondValue.ToString
[code].....
Telling A Generic Function That It Will Use An Interface With A Constructor?
Jan 2, 2011i've been trying to toy around with generics in vb.net in an example project. At the moment, it looks like this:
I have an interface called IRow (and a class that implements it as a Datarow).
A second interface is ICanGetByRow, which looks like this:
Public Interface ICanGetByRow(Of T)
Function GetByRow(ByVal Row As IRow) As T
End Interface
The function simply takes an IRow and converts it to T. Thats easy enough. Now, for easier access, i want to implement a function in the IRow interface which takes the row and converts it into said ICanGetByRow.
My interface was enhanced by the following function
Function GetObj(Of T As ICanGetByRow(Of T))() As T
You can probably see the problem. If i implemented it like this:
Public Function GetObj(Of T As ICanGetByRow(Of T))() As T Implements IRow.GetObj
Dim foo As New T
foo.GetByRow(Me)
Return foo
End Function
i wouldn't be allowed to construct a new T, and when i tried to make it work by telling the generic function that my interface has a constructor, he wouldn't let me invoke GetByRow anymore.
Public Function GetObj(Of T As New, ICanGetByRow)() As T Implements IRow.GetObj
Dim foo As New T
foo.GetByRow(Me)
Return foo
End Function
how to tell a generic function that it will get a ICanGetByRow(of T) which has a constructor
Interfaces - Is ISomething An Interface Or An Object Or Both
Oct 13, 2011I'm working on learning VB.Net after having programmed in VB6, VBA, and VBScript for several years. I'm assuming that something that begins with the letter I is an interface. However, a lot of places I see people/documentation referring to what appears to be class objects that begin with I. I guess I'm under the impression that Interfaces are contracts that class objects can agree to.
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Test If An Object Implements An Interface?
Sep 1, 2009I have an object parameter and I need to check if the object implements a specified interface in vb.net. How to test this?
View 2 RepliesInterface And Graphics :: Display Form As Part Of A Function?
Jul 24, 2008I have only recently started using VB.NET after having a little experience in VB6. I am trying hard to force myself into this OOP mindset. I want to know if a certain thing is possible.
I want to be able to call a function in the beginning of my main form's startup sub. The function call would look something like this.
Code:
Private Sub frmMain_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim Username, Password, NewPassword as String
[Code].....
Interface And Graphics :: Z Position On Joystick Function Winmm.dll
Dec 24, 2011I wanna ask about Z position on joystick fung
Code:
Imports System.Runtime.InteropServices
Imports System.ComponentModel
Public Class Joystick
[Code]....
this code is work for X and Y axis but i dont know how to use Z axis using this code,also how to called the button if it pressed or not?
C# - Naming Convention For Interface Implementator's Object?
Sep 16, 2010What is the most commonly used convention (in C# and VB) to name object, when I want to emphesize that it is an instance of class that implements some interface. Like here:
//is iDisp correct name?
protected void Dispose(IDisposable iDisp)
{
iDisp.Dispose();
Console.WriteLine("Disposed");
}
Declaring A Variable Of Type Interface And Object
Oct 19, 2010what is the difference between declaring a variable in this way
ByVal
List As IEnumerable as
a parametre in a function
Dim
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Drag Drop If Object Implements Interface
Sep 2, 2010I have an interface, for the sake of argument called MyInterface.I Have a Control Class, lets name it "Parent" that implements MyInterface.I have another Control Class that inherits Parent, called "Child".I have a final Control Class lets call it "Container", that accepts dragging the parent onto it.[code]I want to modify this not to only accept Parent, but to accept ANYthing that implements MyInterface. I can't figure out how the heck to get it to work. Even more confusing, if I drag the child onto Container, with the code as it is above(checking to see if a Parent was dropped), GetDataPresent always returns false. I would figure it would work, since Child inherited parent.[code]But it bombs and GetDataPresent returns false whether I dragged a Parent or a Child. I'm being an idiot somewhere..
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