ByRef Not Carrying Through IN Program
Oct 20, 2011The one calls form 2 as a dialog, and passed by ref a "pointer" to the base class(abstract).[code]...
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Get Array Data Passed Using ByRef From A .COM Program Written In C++?
Oct 5, 2010VS 2008 VB/I've implemented an interface to a .com program written in c++. I'm trying to access a data structure array(uNewValues) of type PLCCOMMLib.ANALOG_CONTIN. uNewValues should be a datastructure array of several elements (iSigIDCount). My problem is I only get the first array element of the datastructure.I've tried several methods and looked into marshalling but don't understand how to implement marshalling if that is the correct option.
Code below:
Public Sub AnalogContinUpdate(ByVal iSigIDCount
As Integer,
ByRef puTimeDateStampGMT As PLCCOMMLib._FILETIME,
ByRef uNewValues As PLCCOMMLib.ANALOG_CONTIN)
[code]....
ByRef & ByVal Code - Program To Execute Properly - Can't Get Them To Add Up And Display The Quantity And Price
Apr 7, 2010I started this tutorial on sub procedures and am having trouble trying to get this program to execute properly. The problem lies with the total. I am trying to figure out the math part of it. When I hit F5 I can see this
Item Quantity Price.
Pizza Slices
Fries
Soft Drinks
Total
But I can't get them to add up and display the quantity and price. I tried the ByVal and ByRef code but am not sure if I did it right
Here is the code that I have so far:
Public Class Form1
Private Sub btnCompute_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCompute.Click
Dim pizza, fries, drinks, total As Double
[CODE]...
Forms :: Carrying A Variable To Another Form?
Sep 3, 2010I have the following form: Imports System.Data.SqlClient Public Class Form1 Dim ReturnValue As Object = Nothing
[Code]...
Have Two Forms With The Output Display Carrying On To The Next
Apr 8, 2011I have several forms, the first one the user chooses the pizza type, size and topping, the second they choose the side orders such as chip, garlic bread etc and the third, the user choose the drinks, the last form is the summary form which i want it to display everything the user chose and the overall total.
So for this i want on each form the thing they chose and the price. For example form 1, user chooses 8" Maryland with onions, then they click subtotal button, this adds it up, then they click next to go to the next form and when the user clicks the button for chip it is displayed with the pizza that was displayed on previous form and is added to that subtotal etc. At the mo I can get on each form the the output being displayed but i do not know how to get the output from the previous to already be in the second form. so really for ever form i want the output boxes to be linked.
ps. I have attached a very quick print screen of what my program looks like for each form to give a better understanding.
Carrying Names To Display In Form Label
May 14, 2011In form 1 a user enters there name and if they enter =>3 letters then form 2 shows up. I want it so when form2 shows up, I want the name that was entered to display in a label in this form.
lblname.label = username
Take Two Integers From Two Text Boxes And Put Them Into Two Separate Integer Arrays Then Add Them Right To Left Carrying If Over 10
Dec 17, 2009 i need to take two integers from two text boxes and put them into two separate integer arrays then add them right to left carrying if over 10. here is what i have so far but just looking for the addition i think i can figure out the rest if i get the addition working...
' Project Name: Big Integer Project
' Project Purpose: User enters two integers up to 30 digits each then performs operation.
Option Explicit On
[code]....
Byref New Object - Top Pass New Object As "byref"?
Sep 7, 2009Below I tried to do an Example:
[Code]...
Below is the called method: Friend Sub SplitOU2(ByVal inDN As String, ByRef OUDN As Object, ByRef Organisation As Object, ByRef VerksamhetTyp As Object) By doing this I can skip to declare the in this example "useless" variable Dim VerksamhetTyp as Object = "".
When To Use ByVal And ByRef
Nov 17, 2011I am a student and i get confused when i see a lot of ByRef and ByVal arguments in a sub procedure. Can someone make it simple for me to understand when it should be used?
View 9 Replies.net - ByRef Vs ByVal Clarification?
Dec 8, 2010I've read a lot on this, but am having a hard time thinking through this tonight. (Maybe it's the hydrocodone... just had a root canal. i'm just starting on a class to handle client connections to a TCP server. Here is the code I've written thus far:
[Code]...
Now, on my Socket property, when setting the value, it is required to be ByVal. It is my understanding that the instance in memory is copied, and this new instance is passed to value, and my code sets _Socket to reference this instance in memory. Yes?
If this is true, then I can't see why I would want to use properties for anything but native types. I'd imagine there can be quite a performance hit if copying class instances with lots of members. Also, for this code in particular, I'd imagine a copied socket instance wouldn't really work, but I haven't tested it yet.
.net - Using NMock With ByRef Parameters?
Apr 29, 2009I have to work with an API that uses a lot of by-reference parameters. I'm just beginning to use NMock, and I'm having trouble seeing how to make NMock actually modify one of those by-ref parameters to a specific value. Am I missing something, or does it just not do that? Is there a better way, short of wrapping this API?
View 1 RepliesAsp.net - .Net, EventArgs, ByRef And ByVal?
Dec 15, 2011In VB.Net, I have an object named WorkflowButtonEventArgs that inherits from System.EventArgs.The WorkflowButtonEventArgs class contains two ByRef Properties. These are objects that are in memory, and I do not want them duplicated or copied in any way.
Can I pass the WorkflowButtonEventArgs object ByVal in VB.Net and have it still preserve the two ByRef definitions in WorkflowButtonEventArgs?Specifically, if I pass it ByVal:
Dim e As New WorkflowButtonEventArgs e has some ByRef properties RaiseEvent SomeEventName(e) ' e is passed ByVal Will the ByRef Properties/Members in e (WorkflowButtonEventArgs class) not be copied or duplicated in memory?
Long-story-short: Can I pass e ByVal, or do I need to pass it ByRef since it contains ByRef Properties?
Difference Between Byref And ByVal
May 4, 2010[Code] What is the difference between ByRef and Byval in this function. When i call this function and debug it it shows no difference the two. Can any one explain me actually what happens.
View 8 RepliesDifference Between ByRef And ByVal?
Feb 20, 2009ByRef (a.k.a. By Reference) points to where the object is in the memory. Any changes made to the object sent ByRef should change the values of the original object ByVal (a.k.a. By Value) points to a copy of the object. Any changes made to the object shouldn't change anything in the original object
Let's make an example:
Private Sub FormLoad()
Dim a As String = "A"
Dim b As String = "B"
[code]...
The second messagebox shows Baaaa - Buuuu instead of the expected A - Buuuu... but why is that? Apparently ByVal and ByRef does exactly the same thing. It seems like it sends the reference to the object when using ByVal, instead of making a new object.
Difference Between ByVal And ByRef
Mar 27, 2012Whenever I'm going to use a new API, I have to decide for each value whether I'm going to use byval or byref. Can someone explain me in what scenarios I should use which and why? Because lacking this knowledge kinda gives me the feeling of having no control over my code.I am aware about the other threads by people asking the same question, I have read them but its still not crystal clear for me.
View 2 RepliesDifference Between ByVal And ByRef?
Jun 5, 2012I have seen a few people in the past confused on the usage of ByRef & ByVal in a Function/Sub's Signature. I figured i would make a simple example that demonstrates the difference of each.
Option Strict On
Public Class Form1
Dim A As Integer = 100
[code]....
If you want something you've never had, you need to do something you've never done. If you believe something to be true, then one day you will be called upon to demonstrate that truth.
Is Not Necesary To Indicate ByVal / ByRef Any More?
Feb 9, 2012I just installed Visual Studio 2010 Service pack (proposed on Windows Update), and I can see a new feature on the "intellisense" that means when I write a Function or Sub in VB.NET it doesn't auto-complete parameters with ByRef or ByVal...
1) Is there anyway that I can configure this option back to how it was before?
2) If I don't specify ByX, which one is used by default? (it seems like it is always ByRef)
Store ByRef In A Variable?
Jun 4, 2009Just wondering if it's possible to store a reference to an object in a variable.
I will elaborate:
[Code]...
What Is The Difference Between ByVal And ByRef
Apr 10, 2009What is the difference between ByVal and ByRef? Please remember to mark the replies as answers if they help and unmark them if they provide no help.Welcome to the All-In-One Code Framework!
View 5 Replies.net - Workaround - ByRef Parameter Of A Property
Mar 19, 2009I have a legacy COM-component with an interface declaring a property like this (IDL notation):
[Code]...
This interface is implemented in a calling application written in VB6 like this:
[Code]...
Everyting works fine until I try to do the same in VB.Net. VB.Net refuses to compile code where a parameter of a property is passed ByRef. MSDN says VB.Net doesn't allow such parameters. Is there any way I could implement such a property in VB.Net?
.NET Invoke DLL Method With ByRef Arguments?
Apr 3, 2009Using VB.NET, is there a way to pass a reference argument when invoking a function in a dll.
Suppose I want to pass arg2 as a reference argument, how would I do that?
method.Invoke(obj, New [Object]() {arg1, arg2, arg3})
In other words I want to point arg2 to something else within the invoked function.
Assigning The Value Of A Label To A Variable Byref?
Sep 8, 2010I would like a label to always show the current value of a boolean. This will change a lot of times and would like the label to ALWAYS reflect this.
Is there some kind of way to have the label set to the boolean byref (so its always the same). Currently I'm assigning the label.text = boolean onLoad, so if the boolean changes after that its not reflected.
ByRef Parameter With Type Conversion
Mar 19, 2012I did create a XDateTime class that is able to handle inaccurate date and time. This class has all the CType operators required to convert to and from a string and it has been fully tested during the last months.
[Code]...
ByRef Vs ByVal Generates Errors?
Apr 26, 2010ByRef vs ByVal generates errors!?I had a method that used an Object Function Foo(ByRef bar as CustomObject) as Boolean this method generated errors, because some strange .NET Runtime things changed the bar object, causing its Dispose()al.A lot of time spent to understand the thing(where the ... object is changed), until somebody replaced ByRef by ByVal and object wasn't change anymore when passing to this method.As in my case the function Foo does NOT modify the bar, shouldn't ByRef or ByVal have the same effect?[code]
View 4 RepliesC# - .NET Interop Passing VB6 Form ByRef
Oct 11, 2011I am trying to develop a .NET class that updates a VB6 Form and its controls with various new captions (It is in an assembly that is COM visible).
I pass a VB6 form ByRef as an object to the .NET class and then update the caption etc on the form as follows:
Public Sub AddFormRefLegacy(ByRef objForm As Object)
Try
objForm.Caption = "some new caption"
[Code].....
C# - Accessing Constructor Parameter ByRef?
Nov 22, 2010I want to make a generic EventArgs sub class that has a write-only property which, when updated by the code that is handling the event, will also update the byref parameter of the constructor of the class.
The code I have so far doesn't work. How do I get the property "Item" to update the "item" constructor parameter so I can retrieve the value that was set?
public class EventArgsSet<T> : EventArgs
{
public EventArgsSet(ref T item)
{
[Code].....
Does Specifying The OutAttribute On ByRef Internal Methods Currently Do Anything
Jul 19, 2011VB.NET doesn't have out parameters, but you can specify <Out()> ByRef on COM and P/Invoke methods to get the same effect for external methods.
Does specifying the same on internal methods (i.e. methods only called by .NET code) actually help the Jitter (or VB.NET compiler)? Or is it currently only useful as a programmer note.
Is it possible it could be used in a future Jitter, or is this attribute lost when compiling?
Is The Return Expression ByRef Or ByVal
Jun 9, 2011If a function returns a private shared (static) string, or a string declared as a module level variable, is the returned a reference to the shared string's instance or a different string instance having the same value?
View 1 RepliesVS 2008 Create A Byref Variable?
Jul 16, 2009How would I create a variable and assign it to another variable and when I change one variable it will be changing the other also?
View 3 RepliesVS 2008 Passing ByRef Or ByVal?
Jul 23, 2010I have been working on this for a few days, and I am going around in circles. I can make the program work by including everything in the same sub procedure, but the assignment requires that I do certain tasks by using function procedures.What I need to do is take the contents of a text box, reverse the order of the first and last names, and add them to a list box. I can do that, just not by passing value from a function procedure. Here is my
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