I wrote the following two functions in a class to take a gpib reading and also take a measurement from an LCR meter.
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Public Function gpibRead(ByVal Channel As Integer, ByVal buffer As Integer) As String
Dim readingBufferA1 As String
Select Case Channel
Case 1
readingBufferA1 = gpibLCRA1.ReadString(buffer)
Return readingBuff
[Code] .....
When on the main form I call the funtion takeMeasurement(1) how can I get the LCR readings back. If I try and use readingBufferA1 on the mainform it doesn't recognize that as a variable. I know that it is taking the reading and storing the correct numbers because I am monitoring on NI Spy.
How do you reference a variable in another Class? Public Class Form1 Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load TextBox1.Text = "Class1_Text" ' Would like to replace w/correct code End Sub End Class Public Class Class1 Public Class1_Text As String = "Class1 Text" End Class I can reference the Form1 data in Class1 but not vice-verse.
Create a class named Service. Inside the Service class, declare a class variable named Started. The datatype of this variable is Boolean.Public Class Service Dim started as Boolean End Class Create a class named Server. Inside the Server class, declare a dynamic array that can contain elements of the type Service.(Note: For convenience, both the array and the variable Started can be accessible from a client program that creates an instance of Server and Service respectively)
Create a constructor for the Service class. When the constructor is executed, it will set the value of the class variable Started to True. Create two new classes: WebServer and DatabaseEngine. Both of these classes inherit from the class Service. Inside the Service class, declare a Sub procedure (method) named Terminate. This method should display the following text Service stopping in a message box when executed.This method can be overridden in classes that inherit from Service class.
Inside both the WebServer and DatabaseEngine class, override the method Terminate inherited from their base class Service. Both methods should first call the base class Terminate method. The messages Web server stopping and Database engine stopping should also be displayed in a message box when the Terminate method for the WebServer and DatabaseEngine are called respectively. These messages should only be displayed if the Started variable inherited from their base class is not equal to False.
Inside the Server class, declare a method named Shutdown. This method does not return any value. When executed, it will call the Terminate method for each of the Service instances (if any) in the arrServices array. You should call the Terminate method within a For Each loop that loops through the elements of the arrServices array.
In the Sub Main method, create an instance of the class Server. Set the size of the arrServices array in your Server instance to contain 2 elements. Create first a WebServer instance and then a DatabaseEngine instance into this array. Call the Shutdown method from your Server instance.
I want to created a nested class that can only be visible to and instantiated from the parent class.But I also want to be able to use an instance of the nested class through a public variable of the parent class.I tried making the nested class private, or making the nested class' constructor private, but it won't compile.Is it possible to do this in .NET?
I have procedure (Import) that calls a for a new instance of frmImportData. I also have a class name clsBatch that has a data table property called prpParametersTable.For some reason, I get an error (indicated below with ERROR>>>) when trying to assign prpParameterTable to cv_dtImport2. The error states "Object reference not set to an instance of an object.". Why does this error not happen when I assign dtBP to cv_dtImport1? Both cv_dtImport1 and cv_dtImport2 are equal to Nothing and in my Import procedure dtBP = prpParametersTable.
Public Sub Import(ByVal clsB As clsBatch) Try Me.cv_clsB = clsB
I have three class files, accounts.vb and transactions.vb in addition to my form.vb. I am unable to retrieve a member variable from on class from inside the other. When the combobox index changes, the program loads the correct account (checking or saving) from two different sequential files. I don't think I have the calcBalance procedure in the correct class file. And that is what I am having trouble with. Accessing it to display it. [Code]
1. How to return the variable name itself? Public Class test Public Shared as String = "111" End Class I want to return AAA but no 111, test. = "111", and test. Tostring = "111"
2. I want to join the space char into the variable, for example A B but no AB, how to do?
Class Human End Class and another class which refers to the human class
Class ASD Private somevar as new Human End Class
Ok now i've got a problem, i wish to rename my class Human, to Man. i've got to change Human to Man 2 times, which is OK but the problem is that in the real case, its not just 2 times, its like 500 times or more.
Well its something like a PHP on Javascript.
the following shows the solution of what i'm trying to do, but its in another language PHP/Javascript:
note: in php $ sign declares a variable, echo writes the variable out
working with: ASP.net using VB.net connecting to MS SQL Server
What I'm trying to do is take the result of a SQL select query and place that in a string variable so it can be used in things like a textbox or label. code so far that doesn't work...
Imports System.Data.SqlClient Partial Class dev_Default Inherits System.Web.UI.Page Protected Sub form1_Load(ByVal sender As Object, ByVal e As System.EventArgs)
This is my simple code that calls a function from a class I created called "clsNetwork". The function simply pings a computer from a computername I pass it and returns the results.
Dim PingStatus As String PingStatus = clsNetwork.PingComputer(ComputerName) txtbox.text = PingStatus
Can't seem to figure out how to use a function return variable in global Dims[code]...
I have also tried adding "FixPath()" under Sub On_load() but got same result. Also the reason I have to have these global is because I have around 30 Subs that refer to "Path" Variable.
I am writing a program with multiple forms (for inputing loan/financial information - so they are set up exactly the same albeit a form number (ie: 1-6)) that feed into a summary page form to display each individuals form's information. When the user closed a financial form, it then feeds the information to a summary page using the code I have below: [Code]. I am new to working with functions, and have not been able to find anything that can show me how to fill multiple textboxes with them (I only know how to return a variable using the function to work a calculation). Any way that I can write a function (or any other call) for this would save me a tremendous amount of coding, and make debugging worlds easier.
excuse my stupidness, i'm fairly new to VB and i've only done a little bit with it before. Basically i am making a little application that i want to run on my machine. Standalone not via a web browser.I have a web page which is generated using php, there is no html code on the page simply a number, e.g. "9995" when you view source.
All i want to do is return this value from the web page (without actually opening the page in a browser) and display it in a text box in VB or store it as a variable that i can use later. point me in the correct direction or right keywords to research, or if you have a simple example that would be even better
The code below works for the class that I hard coded "XCCustomers" in my RetrieveIDandName method where I use CType. However, I would like to be able to pass in various classes and property names to get the integer and string LIST returned. For example, in my code below, I would like to also pass in "XCEmployees" to my RetrieveIDandName method. I feel so close... I was hoping someone knew how to use CType where I can pass in the class name as a string variable.
Note, all the other examples I have seen and tried fail because we are using Option Strict On which disallows late binding. That is why I need to use CType.I also studied the "Activator.CreateInstance" code examples to try to get the class reference instance by string name but I was unable to get CType to work with that.When I use obj.GetType.Name or obj.GetType.FullName in place of the "XCCustomers" in CType(obj, XCCustomers)(i)I get the error "Type 'obj.GetType.Name' is not defined" or "Type 'obj.GetType.FullName' is not defined"
I have put this code in the global form Inherits System.Windows.Forms.Form. And then in the form that will inherit this from the global Inherits MenuStrip. "MenuStrip" is what the global form is called. But keep getting this error: Error1Base class 'MenuStrip' specified for class 'Lesson2' cannot be different from the base class 'System.Windows.Forms.Form' of one of its other partial types.
Public Shared x As String = "100" Public Shared y As String = "text" Public Shared z As String = "something"
[Code]....
But this doesn't do what I want, naturally. What I want is that my function giveVar returns the value of the variable that holds giveVar. For example I call giveVar("x") I want my function to return "100".
Of course this can be done by a Select Case but thats not what I like to do. Is it even possible to call a value based on a string?
[edit:]
Namespace i18n public NotInheritable Class Settings Public Shared LanguageCode As String
[Code]....
I think this works so far, BUT I get the following error on the CallByName(Me, varName, vbGet) at the Me : "me is only valid within an instance method"
I am building a GUI for a touchscreen panel using VB2008 and am trying to set up a password change screen. I have an on-screen keypad set up so the operator can use it to enter the new/old password. How do I return the value from the key pressed to where the cursor is located?
When trying to register a new user on the server, the server will post back messages such as "OK" and "usernameTaken". Upon comparing this returned string with another string (to perform an action based on the returned value), the compare isn't working.
Dim backupX As New CBackup backupX.startSocket("127.0.0.1", 8888) Dim str1 As String = backupX.registerUser("user1", "testpass") Dim str2 As String = "usernameTaken"
[code]....
Looks to be like the socket code is working just fine.. each Function returns the corresponding Functions' Return value (registerUser -> SocketSendAndReceiveMSG -> sendAndReceiveMSG -> receiveMSG).
When i press the button3, i want the webbrowser change site after how mutch the clock is. Is the clock between 9:00 and 17:30, the webbrowser is gonna change to swedish sites. If the clock is between 17:31 and 21:30, the webbrowser is gonna changes to american sites. But the webbrowser is only choose ONE swedish site and ONE american site. The problem is that the variable b does not save the value it has before.How to i make so the variable b saves the value it has before? b = b + 1 is gonna be first 1. Then if i press the button3 agin, it gonna be 2. and if the value is 3, it gonna be 1 agin.
PHP Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click Dim changesSE(3) As String Dim changesUS(3) As String
It's often the case that I can write a nice tight little VB.NET function, and when it comes time to do the Return statement, it's really natural to just return the result of a quick calculation or a method call. However, this makes it difficult if I need to step through the debugger to see what is going to be returned from that Function. For example, take this simple method to illustrate the concept[code]...
I have a class i've called "buttons", which passes in 1 variable, the button text, and then returns a new button with that text. however, i do not know how to get the class, when called to return a button.
similar to how 'toString' works, except it would return a button object instead of a string. (im not sure how toString works in vb.net. in java it is automatically called when you call the new class, so newclass and newclass.toString(); return the same) [code]...
Function GetSomething() as String GetSomething = "Here's your string" End Function or Function GetSomething() as String Dim returnString as String = "Here's your string" Return returnString End Function
Obviously, neither of these implementations make any sense, but they're just meant to illustrate my point. Is there anything to be gained by using GetSomething itself to store the return value instead of declaring returnString locally and then returning that (does it avoid having an extra string allocated/instantiated - and if so, are there any performance/memory benefits)?
I'm moving code from code-behind to classes and run into a problem. I have a method which makes a string (an html invoice). In the method a final amount is created. I want to make a class called Invoice which will have the method "CreateInvoice" which will return a string and I also want to set the finalCharge property of the object.[code]
