Read Data From XML Into Object Class?

Aug 14, 2011

I want to read data from xml into memory. My code works fine providing I only have one record in XMl file. If I have more than 1 record the program fails.[code]...

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Read/write Data From Another Class?

Jan 28, 2012

My assignement is to create a simplistic checkbook organizer. The GUI is built, and the form is needing to call to a transactional class i have created. My problem is I dont know the right commands or syntax. I though I had it, but i'm getting an error.

Error: "Arguement not specified for parameter 'PreviousBalance' of 'Public Sub New (PreviousBalance as Double)'.

Here is my code so far for the form:

Private Sub btnAddTransaction_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnAddTransaction.Click
'declare user input variables in this GroupBox2
Dim TransactionAmount As Double

[code]....

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Write And Read Class Data To And From A File?

May 3, 2009

What is the best way to write & read some customised class data to and from a file as a way of saving my application settings?

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Read JSON Data From A Server To A Dataset Object?

May 18, 2009

I am trying to read JSON data from a server to a dataset object, any idea on how this can be done. I have tried using the DataContractJsonSerializer class but it only seems to work for objects.

JSON Data
{
"firstName": "John",
"lastName": "Smith",

[code]....

The code above works to an object, but I want to parse the JSON data to a dataset object.

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VS 2008 - Passing A Object Data To A Class?

Oct 5, 2010

I've got a main form (Form1.vb) where I created some controls (with the Designer).I've created a class myTextBox, inheriting from TextBox, in myTextBox.vb.In the main form, I call procedures from myTextBox. The issue is, those procedures use values from the Form controls. So the class doesn't recognise them as initialised.What's the best solution for this?I think I could pass the object itself as a parameter but doing it on each call seems a bitredundant and it thickens the code.Is there any way to access the Form1 controls and objects directly from the myTextBox.vb class?

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How To Pass Form Object To Data Class For Update

Mar 11, 2009

I am converting some VB6 code which passed an unknown form object to a class, which then used the passed form object to reference the calling form and direct the data from the class as follows:
The Called Class in the class clsGetRecord
Public Function Execute(ByRef FRMForm as form) as booleanFRMForm.List1.Additem(SomeData)....Execute = SomeBool End Function
The clsGetRecord is used by many different forms which receive data all have objects called List1 as: The Calling Form for the form
frmThisFormPrivate function() as booleanDim objRecord as new clsGetRecordbRet = objRecord.Execute(frmThisForm)
The passed form object which will receive dataEnd function. Is there any simple way to do this since the calling form object is unknown at design time?

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Utilizing A Centralized Class object That Needs To Call Another Class Object?

Jun 7, 2010

I am utilizing a centralized class object that needs to call another class object. The program itself will do something like the following

sFieldValue = CentralObject.ObjectHandler(1, TestFunction, "FunctionVar,FunctionVar2,FunctionVar3")

In the central object I have a function

Public
Function ObjectHandler(ByVal ObjectType
As
Integer,

[code]....

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Flattening An Object Hierarchy Using A Shim Class - Initializing Derived Object Properties From The Base Object?

Jul 10, 2010

I am somewhat new to object oriented programming and am attempting to flatten a Linq object hierarchy by using a shim class.how to initalize a derived class with property values from a base class?I have two objects, a base object with about 100 properties, and a derived object which inherits from the base object and adds a few additional properties beyond those of the base object. My simple constructor creates the derived object, but I am looking for a way to initialize the derived object properties with values from the base object.Right now I am using reflection to iterate over the properties individually and I suspect there may be a better way. The following example shows my shim class constructor for the derived class, and two properties:

newProperty1 - a new string property of the derived class

flattenedProperty2 - a new string property of the derived class, copied from a 2nd-level object of the base class

Code example:

Public Class derivedObj
Inherits baseObj
Private _newProperty1 As String[code].......

Is this the correct constructor approach to flatten the object hierarchy using a shim class? My second question relates to initialization of properties in the derived class. The constructor above creates the derived object, but what is the best way to initialize the derived object properties with values from the base object? The following code uses reflection to iterate over the properties individually, but I suspect there may be a better way.

Code example:

' property names are in the string array fieldNames

'baseObjQuery is an ienumerable of baseObj

'derivedObjList is a list of derivedObj[code].....

Is there a simple way to initialize values for the properties in the derived object based upon the values of the common properties in the base object?

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Using List Of Custom Class Object As Data Source For Crystal Report

May 24, 2011

I am trying to find way to design a report using my own custom class. I found links:

1.) How to work in Crystal Report with Object Data Source?

2.) Use .net object as data source in Crystal Report 2008

3.) Binding object with List<> to Crystal Report

4.) How to assign Custom class as datasource in crystal report

They were quite helpful, but I have been stuck in the first step while designing report as my custom class's property is not listed in field list of crystal report design view.[code]When I add my class objects to crystal report I do not get the usertype field from users class in field list.So how can I add usertype field to my field list? Or do I have to take another approach?The reason i wanted to use it as i am:

1.) Showing a form where user can type keyword
2.) program filters the records as per keyword using LINQ
3.) when user clicks the print button, I want to set the filtered records as datasource of my report

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DB/Reporting :: Write A Data Layer Class To Read In Information And Populate Combo Boxes?

Feb 3, 2012

I'm trying to learn how to write a data layer class to read in information and populate combo boxes, etc.

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VS 2008 Object Data - Create A Class And Create A Instance Of CarData?

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?

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Object Reference Not Set To An Instance Of An Object With A Class With An Array Of Classes As A Member?

Aug 6, 2010

Here is the structure that I have:

Friend Class StandardFormatFile
Friend fileType As String
Friend numberOfSeries As Integer

[code].....

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Access To Object Passed ByRef In The Constructor Of A Class Through Another Part Of The Class?

Aug 18, 2009

I have some classes, BsfciFile and StudyFlashCard. Bsfci is the extension to which I save my set of flashcards in an INI format. I am currently working to transform my code from using Windows API calls to access the INI to using a IniFile class that I found on the internet. I would like the BsfciFile to have a Array of StudyFlashCard objects, but I would like the StudyFlashCard class to use the IniFile class object contained in the BsfciFile class. I can pass the IniFile from the BsfciFile class to the constructor for the StudyFlashCard class, but I want it to modify the same IniFile as the BsfciFile class has later on.

[Code]...

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VS 2008 Adding Class Object To List Or Array In A Different Class

Jun 21, 2010

I am trying to create an list or an array of a class.Here is my "Ingredient" class that I am trying to create a list of:[code]In my "recipe" class, I am want to create a list (or array) and I am drawing a big blank on how to do it. Can anyone point me in the right direction?

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Instantiate Object From Class Using String Variable For Name Of New Object?

Aug 11, 2009

dim myCollection as new Specialized.StringCollection
dim myFoundThings as new ArrayList
dim index as Integer
dim newResultMemberName as String

[code]....

This is part of some code that will run without user interaction once it's spinning away, and I need to create a unique object from some items found in a StringCollection, naming the objects using information found in the strings stored in that StringCollection.

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Iterate Through Class / Object Properties - Saving Them Each To Another Object

Dec 15, 2011

I'd like to have something like:

[Code]...

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Type Conversion From Webservice Object To Class Object?

Jun 15, 2009

i've created bunch of classes. i have webservices which reference these classes and contains the classes as parameters and return objects.when i call the weservice, i have to convert the class to the webservice object else i can type conversion error.is there a generic way to convert between these types without having to assign the values by hand?

for example

public class person
fname as string
lname as string
end class

[code]....

i would liek ot be able to call the web service and return the data type back and have a generic coversion instead of as above in stead of:

dim wsPerson as wsReference.Person = ws.getperson()

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Class With Class Properties: Object Reference Not Set To An Instance

Aug 19, 2009

I have a class in which some of the fields are also classes.

I can put values in the "normal" properties, but in the others when o try to assign values it gives the: "Object reference not set to an instance of an object"

But the code compiles fine.

dados_Defenicao = New ServiceReference1.draftClaimEntryDefinition
dados_Defenicao.arCode = "123"
dados_Defenicao.claimMarket.warrantyType = "w" - Here it gives the error

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Get Base Class Object Reference Outside The Class's Definition?

Dec 10, 2010

If we are within the derived class then ofcource we can use MyBase keyword to access base class's object reference . That's fine , how can we take that base class's object reference outside that derived class's definition.My following code will explain what i want . Actually that is giving error right now, but it is explaining my requirement .

Public Class Base
Public x As String
End Class

[code]....

Actually there is error in ReadOnly Property BaseReference's Getter . Error is "Error 1 'MyBase' must be followed by '.' and an identifier. " how can i get base class object reference in Main method ?

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IDE :: Class Files. Same As Namespace Or The Same As The Class Object Inside?

May 22, 2009

If my namespace is Company.Application.EDI.Acknowledgement and if I stick with theprogramming practice of one class per file then should my class be saved asacknowledgement.vb? Are there any gotchas that will come up?

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Reference A Parent Class Object From A Child Class?

Jan 2, 2010

I have a Parent Class Called Fuselage that containsfour child classes called Forebody, CenterBody, AftBody, and CrossSection. CrossSection classcontains objects common to Forebody, CenterBody, and Aftbody (example: width). How do I access thewidth property in CrossSection from within the classForebody?

Public Class Fuselage
Dim Forebody As ClsSection
Dim Centerbody As ClsSection

[code].....

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Add A Class And Get The Driver Module To Read From The Class?

Nov 13, 2009

What is a driver module, and how would I add a class and get the driver module to read from the class.

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Create An Object From The Class - Use The Object To Interact With The SQL Db?

Apr 12, 2006

I am developing an IT Asset Tracking application using VB 2005 and SQL Server 2005 Express edition. Will I need to create classes to represent objects such as Computers, Printers, Scanners/Faxes, Contracts, Purchase Orders etc or are there any other approaches.For example, if I am correct, I will have a class called Computer and its properties will include Make,Model,CPU,Hard Disk,Memory etc. Is this the right approach.

Computers can be split up into Desktop PC's, Servers and Notebooks. Would I have to create separate classes for these as well or would they be ok under the Computer class.Once I create an object from the class, how can I use the object to interact with the SQL db.I am a beginner to VB.NET 2005 therefore I am slowly getting to grips with OOP.

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"upgrade" An Object To An Inherited Class, And Keep All The Base Class's Property Values?

Jul 5, 2010

bare with me during this silly example. :-) Let's say I have a class like this:

Public Class Animal
Public iLegs as int32 ' Number of legs
Public bWings as Boolean ' Wings? Yes/No
End Class

And another class that inherits the "Animal" class and adds one more property:

Public Class ScaryAnimal
Inherits Animal
Public iScariness as int32 ' 0-100, how scary is it?
End Class

Now, if I have an instance of "Animal" with some values in it, and I decide I want to cast it to a ScaryAnimal for some reason, how do I do that without having to create a new instance of "ScaryAnimal" and copy each property value?Basically I'm looking for a way to do this, without having to write the lines marked with '*** below:

[Code]...

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Declaring A Object - Instance Of An Object To Be Created When A Form Loads Or Another Class Is Created

Oct 5, 2009

If you want a instance of an object to be created when a form loads or another class is created, you have two options:

Public class example

private IAmAObject As IAmAObject

public sub new()

[CODE]...

Or like this:

public class example

private IAmAObject as new IAmAObject

public sub new()

[CODE]...

I always use the first one. It's more type work but I think it's neater. How about you people and is there any real difference between the two?

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Comm Port Read Hangs When Attempting To Read Data?

Apr 18, 2010

I;m attempting to write code to read several NMEA ports and format the data for archive. When I execute the following code:

Using Commportno As IO.Ports.SerialPort = _
My.Computer.Ports.OpenSerialPort(portName:=port)
Dim Incoming As String = Commportno.ReadLine()

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Class Diagram - Called Control Fields Not Object In The Class Diagram ?

Nov 11, 2011

if I put controls on form1 like button,textbox....etcwhy called this control fields not object in the class diagram ?

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Format Date In Data Grid View Object Not Set To An Instance Of An Object?

Jan 29, 2012

I'm trying to set the format of a column in a datagridview.When I put the format statement in the on load event for the form, it has no effect. When I put it in the cellformatting event I get the "Object reference not set to an instance of an object" error. I checked the column name. What I am doing wrong?

This is the code:Private Sub MeetingTblDataGridView_CellFormatting(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellFormattingEventArgs) Handles MeetingTblDataGridView.CellFormatting
Me.MeetingTblDataGridView.Columns("Starttime").DefaultCellStyle.Format = "HH:mm:ss"
End Sub What I'm trying to do is get rid of the date part of a Date/Time field (stored in an Access database) in a datagridview column.

dp.SyntaxHighlighter.ClipboardSwf = '/dp.SyntaxHighlighter/Scripts/clipboard.swf'
dp.SyntaxHighlighter.HighlightAll('09dde30f062e451a854266e66205b1cf')

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Failure To Create Data Controls To Access Database Object Reference Not Set To An Instance Of An Object?

May 3, 2011

I was create Access database with Access 2003. I create VB project with Visual Studio 2005 Standard With connection wizzard I create coonect with this Access database, select all tablesI see this database inside Data sources and inside Server explorer Test connection is OK When I drag and drop table from Data sources, Wizzard don't create DataGridView, DataSourceBinding etc .. and I see popup window with mesage: Object reference not set to an instance of an object and then "game over"

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HSD 32 Bit Data Bus To Serial Converter Via A Microcontroller - Data Sniffer To Read The Data Bus (32Bit)

Sep 3, 2008

Im working on a HSD 32 bit data bus to serial converter via a microcontroller. Now first I want to make a sort of data sniffer to read the data bus (32Bit) .All on the controller side is working and the stream of bytes are coming in via RS232 as 4 bytes in HEX like FD,A5,45,8B . I already converted the bytes in Dec and ASCII to determine what is passed true the bus and how fast and stuff.. Now that is all correct and working very well if the LSB (least significant bit) of the 32 data bus is Data line 0 and the MSB (most significant bit) is Data line 31 but if that is not the case I need to invert the 32Bits (like as I would invert the connector on the bus) . How do I best do this using the 4 bytes I send from the micro controller.

Example:

(MSB) 01001000 01100101 01101100 01110000 (LSB)
HEX= 48 65 6C 70
DEC= 72,101,108,112
ASCII= H E L P

I need to invert it with a button to:

(MSB) 00001110 00110110 10100110 00010010 (LSB)
HEX= 0E 36 A6 12
DEC= 14,54,166,18
ASCII= (SO) 6 : (DC2)

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