How To Use Constant In Structure In VB 2008
Aug 8, 2009I want to know that how we access a constant which is declared in a public structure, with an instance of that structure?
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Public Constant Versus Private Constant?
Aug 13, 2011When building a class library which contains many classes, all classes uses a lot of common constants and functions, what is the best to do:
1- Declare these constants and functions as public in a module.
2- In each class declare constants and functions used by individual class as private.
The first choice is good for easy and fast implementation, but re-using a class in a different project will require importing the module to the other project.The second choice require a lot of copy/paste for code snippet but a class can be re-used in different project easily.
VS 2008 Convert The XML Structure Into A Class Structure?
Apr 25, 2010I'm having a problem that's driving me crazy; I can't understand how to convert the XML structure into a class structure (that I want to use to hydrate a XML document).
The XML document looks like this:
xml
<?xml version="1.0" encoding="utf-8"?>
<artists xmlns:opensearch="http://a9.com/-/spec/opensearch/1.1/" xmlns="http://www.spotify.com/ns/music/1">
[code]....
VS 2008 Constant For A Changing Date
Oct 26, 2009I would like to know how to apply code for a date that will expire 5 days after whatever the current date would be and it needs to be a "constant".For example: When the user loads a form, the current date is assigned, and the expiration date always needs to be 5 days after the current date.
View 4 RepliesVS 2008 Parsing Strings With The Constant At The End?
Feb 15, 2010I have the html of a page loaded into a string.
confirmUse('??????','Eat'
I want to extract the number that the ?'s represent however confirmUse is used in other parts of the page. The only constant is the 'Eat' which is unique to this specific number.
I usually use Mid and Instr to find what I need but when I try to back track it gives me an error because the index number is below 0.
VS 2008 Create An Array Of Constant Variables For Program?
Nov 5, 2009I want to create an array of constant variables for my program. But from everything I read about arrays they are handled by a number. I want to be able to pass back a variable that will hold the name of the constant as well as the value. How would you go about do that.I want to when I type the variable to have the constant name show up as I am typing.
View 4 RepliesVS 2008 Working With Hash 512, Selecting A Constant SaltByte?
Mar 12, 2012I've been trying to take a text string converted to HASH512 and have a textbox to verify that the entered string to HASH512; if HASH512A <> HASH512B then "incorrect password".
The problem is I don't know how to specify a certain saltByte prior to running the function.
vb.net Public Shared Function ComputeHash(ByVal plainText As String, _
[Code]...
Structure Inside Another Structure Receives Null Reference Error?
Jan 5, 2012Module Module1
Public Structure structure1
Public TRANS() As structure2
End Structure
Public Structure structure2
Public X() As Integer
End Structure
End Module
Class Structure - Large Structure That Has Lots Of Properties ?
Jan 5, 2010I'm new to VB 2008 after having spent a long time with VB6, so I apologize if this is a stupid question. But I'd really like to have this straightened out.
Let's say I have a pretty large structure that has lots of properties.
Code:
Now say that I want an internal database with about 10 instances of this structure total, describing, say, 10 different products that a store sells. When these values are loaded from a database, they remain totally static. (However, they can be different each time a program loads)
Now say that I have a class. Each instance of this class is a type of that BaseProduct structure. Meaning, each instance of the class pertains to one of the 10 types of products that the store sells. However, this class has additional properties that pertain specifically to each instance, which are not static.
Code:
Now, the problem here is... If I have 200 different transactions, each one contains an instance of BaseProduct. BaseProduct is HUGE, and is largely redundant (only 10 types possible), so I think it's a little silly to include a whole copy of it with EVERY transaction. However, the Transaction class really needs information regarding the base product it pertains to. Is there a way to, instead of declaring a New BaseProduct in the Transaction class, to simply make one of the properties of the Transaction class a pointer to a BaseProduct variable?
In VB6, I would accomplish this by making a BaseProduct(10) array, and then giving each Transaction an ID number referring to an entry in that array. But in VB 2008, using class structure, this is impossible. I can't define the BaseProduct(10) array outside of a class in a namespace, and if I define it in the actual application's form, then the class loses modularity since it relies on the application that's using it.
Converting Structure Within Structure To Byte Array For Socket
Aug 29, 2009I am trying to communicate with an external device and i am trying to send a byte array to the external device via sockets but i am always getting a response the message size is too small so i am not sure what i have done wrong. Between the data type there should be no alignment present and all numbers are represented in little endian format. The char array is not null terminated as mentioned in the protocol specifications.
I have to send data based on a struct that embeds 2 other struct. So here's my vb.net code for the struct used to convert to byte array and the sending part.
Public Structure MESSAGETYPE_OIP_Login
Dim Header() As COMMANDHEADER
Dim UserName() As PSTRING
[Code]....
Invalid Structure Size When Marshalling C Structure To .NET
Apr 14, 2012I'm experiencing a problem with the following c-structure:
typedef struct tagTEXTUREPROP
{
DWORD dwSize;
[Code].....
The Marshal.SizeOf obviously calculates a size of 76 and it works with the DLL function, but it leaves me with some bad feelings.
VS 2008 Dynamically Declaring A Constant - Public Const Blah As String = Variable & "something"
Aug 5, 2009How would I go about dynamically declaring a constant? (It's value is dynamic, not the variable name)
View 5 RepliesCreating Structure In 2008?
Apr 3, 2012how to create a structure in Visual Basic?r example:
Public SCARD_READERSTATE()
Dim szReader As String 'reader name
Dim pvUserData As Long 'user defined data
[code]....
I'm using Microsoft Visual Basic 2008.
VS 2008 DateTime Structure?
Jul 29, 2009I want to pick specific elements from DateTime and assign them to variables: Year, Month, Day, Hour, Minute, and Second. In MSDN, I saw ways to assign it all, but not what I needed.
Can anyone one give a hint, or two?
VS 2008 Some Hint About Structure?
Mar 13, 2010Im triing to use structures.example
Public Structure Column
Dim ID As Integer
Dim Name String
Dim Birth As Date
End Structure
1) Is possible know how many element are in the structure?
2) is possible retrive the type of the data inside a structure? (Integer, String, Date)
3) is possible scan the element without use their name (by using an index as in the string) instead of use Column.ID=1 ? If the none of the questions are positive, what other stuff should i use that allow me to do that?
VS 2008 TreeView Structure
Mar 31, 2011The General TreeView Structure, with the level indicated in the left.[code...]
Leaving the 0 and 1 levels, the other levels has to be treated as above. How to achieve this?
VS 2008 Using ArrayList With Own Structure?
Oct 11, 2009I'm trying to use my own structure as a dynamic array (ArrayList?) but can't find the right syntax.
Public Structure BLsCompsRootDir
Public BL As String
Public Component As String
[code].....
VS 2008 XML Structure To String?
Sep 23, 2011writing an XML-formatted string so that I may later encrypt it.If I create an XMLDocument,it will insert its formatting tag <?xml version="1.0" encoding="Windows-1252"?> and I need to avoid this.I'm not very familiar with streams, or how to output an XMLWriter to one.
View 3 Replies[2008] Enum In Structure
Feb 4, 2009I am coding in vb.net. I want to achieve something like this (sample) -
Structure Transport
Dim land as L
Dim Air as A
[CODE]...
But though i can create enum but how can I embedd it in structure. It is not allowing me to do that.
[2008] Getting Structure Outside Module?
Feb 27, 2009I am using Visual Basic .NET 2008. I have a module in my project and couple of windows forms. Now in my module I wrote -
Structure Transport
Dim Veh as Vehicle ' pointing to enum below
Dim GoAhead as boolean
End Structure
[code]....
What I want is that another form should be able to call my sub Select (declared as public) and pass enum data declared in Transport structure. VB allows me to do that if my sub is private but not if my sub is public. To overcome this issue one solution is to declare the enum in the form class itself. But for this I will have to do it in each form.
Arraylist Of Structure Within Array Of Structure?
May 23, 2010I want to make a structure within a structure. Basically it will appear like this:
Structure ID
dim CardType as string
im CardCode as string
[code]......
Assign Array Of Structure To Another Of Same Structure?
Oct 12, 2010In Vb.net I am trying to assign an array of structure to another array of same structure[code]...
View 2 RepliesVS 2008 - Run Function Or Sub At Structure Change
May 11, 2010I have a question: How can I make a function or sub run inside a structure when a variable in this structure changes? As example I have this function:
Public Structure Texture
Sub New(ByVal TexturePath As String)
Me.Path = TexturePath
Me.Image = LoadImage(TexturePath)
End Sub
Public Path As String
Public Image As Image
End Structure
And somewhere this happens:
Dim t As New Texture("path ooldfilename.tga")
t.Path = "path o
ewfilename.tga"
I want it to automatically load the image when the "Path" variable changes. Is the only solution making an extra sub and run that? It would really decrease my code size if it changes on variable change.
VS 2008 - Serialize Array Of Structure To XML
Jun 3, 2010I desperately seek for a code sample to serialize an array of structure elements to a XML. To serialize a simple object of a structure I used:
Private Sub saveEntries()
Dim FS As New FileStream(path, FileMode.Create)
Dim XS As New XmlSerializer(GetType(personEntry))
XS.Serialize(FS, entries(0)) 'serialize first entry of an array - success
FS.Close()
End Sub
Structure looks like this:
<Serializable()> Public Structure personEntry
Dim name As String
Dim d, m, y As Integer
End Structure
Private path As String = "data_file.xml"
Public entries(2) As personEntry
But how to apply this to an array?
VS 2008 - Structure Cannot Be Indexed Because It Has No Default Value
Mar 8, 2010Structure EmployeeData
Dim EmployeeName As String
Dim JobTitle As String
Dim TaxRate As Single
End Structure
[Code] .....
VS 2008 - Writing Structure To File?
May 6, 2009Okay, I have a structure that contains numerous elements... mostly strings, one or two integers. I maintain an internal array of that structure. The structure contains ONLY data elements, no code.I want to save the data to a file. I know that I CAN use StreamWriter.Writeline()to put out a formatted string for each element in the array. But is there any way to simply open a binary output file and save each structure, one after the other? And conversely, to load the array again in similar fashion? Something similar to this in intent, though I realize the code below doesn't work.
[code]...
To repeat, I want to write an entire structure to a datafile quickly and easily, without having to save each member of each element in the array. And conversely, to read the data back in the same way for easy loading of the array.
VS 2008 : Reading A Structure From A File?
Apr 12, 2010I have several quesions about reading/writing structures from/to files.In a scenario when I open a data file having its own header and variable data fields I create a structure that represents a header consisting of 9 bytes:
Public Structure HeaderInfo
Public DataField1 As Integer
Public DataField2 As Byte
Public DateField3 As Integer
End Structure
I'm using this code for the time being:
vb.net
Public Function ReadHeader(ByVal FileName As String) As HeaderInfo Dim ReturnInfo As HeaderInfo Try Using br As New IO.BinaryReader(New IO.FileStream(FileName, IO.FileMode.Open, IO.FileAccess.Read, IO.FileShare.Read)) With ReturnInfo
[code]....
The first question is - can I fill the structure directly somehow? Some structures are very long and filling them this way will be tedious. For example, if I know the length of the structure I could read the needed number of bytes in a byte array and somehow marshal these bytes into the structure.I can use Marshal.PtrToStructure, but then I would need to get an IntPtr of my byte array. I use <Serializable()> attribute for my structure.
VS 2008 Download Structure Fails?
May 25, 2010I am totally into structures at this point, mostly because of their simplicity in use. I am now working on a "download structure", which allows you to download and keep track on a file.This is the
Public Structure FileDownload
Sub New(ByVal URL As String, ByVal DestFilePath As String)
Me.URL = URL
[code].....
VS 2008 Update Structure In .tag Property?
Mar 29, 2010 I am creating labels at runtime. Inside the .tag property I have a structure. Everytime I attempt to update the structure the .tag property doesn't update.
Here is the structure:
Public Structure structChip
Dim kingStatus As Boolean
Dim currentTileLoc As Integer
[Code]....