Main Array That Is A Structure With Three Fields Which Consists Of Id_code(int), Members(int) And Annual_income(dec)?
Mar 2, 2010
I have a main array that is a structure with three fields which consists of id_code(int)members(int) and annual_income(dec). I've get everything entered and I want to go to a procedure that prints a report giving the total percentage of families below a particular income and the level is different depending on how many members there are in the family.
Option Strict On
Public Class Form1
[code].....
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Jan 13, 2010
Our Winform app consists of a Main.exe and a Launcher.exe. The purpose of the Launcher app is to check for updated versions of the Main.exe. If it finds no updates it launches Main.exe using System.Diagnostics.Process.Start
If it finds an update, it copies the new Main.exe into position and launches Main.exe the same way (in this case it will be a fresh copy of Main.exe).Here's the Process.Start code:
Dim p As New ProcessStartInfo
p.FileName = "Main.exe"
p.WindowStyle = ProcessWindowStyle.Normal
Process.Start(p)
This code executes whether or not there's been an update and always successfully fires up Main.exe.However our Main.exe, if it's being run for the first time (ie. after an update), will error on any line which references the My namespace, such as My.Settings or My.Computer.FileSystem For example this line will cause an error:Msgbox(My.Computer.FileSystem.SpecialDirectories.Desktop)
Here's the error: System.IO.DirectoryNotFoundException: Could not find special directory 'Desktop'. at
Microsoft.VisualBasic.FileIO.SpecialDirectories.GetDirectoryPath(String
Directory, String DirectoryNameResID)at
Microsoft.VisualBasic.FileIO.SpecialDirectories.get_Desktop()
at
Microsoft.VisualBasic.MyServices.SpecialDirectoriesProxy.get_Desktop()
But while this example refers to Desktop remember it can't find any of the SpecialDirectories. It's not restricted to Desktop. But only the first time it's run (ie. immediately after an update). Thereafter it will run fine.If the process failed more spectacularly, to do with file system issues, locks or threads, it would be more understandable. But why just this "minor" problem with the My namespace?
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Jul 2, 2010
I'm having some headaches using Structures and functions that return Nothing in VB.NET. [Code] In the previous code, when I return Nothing as result of Foo function I'd expect that st is Nothing. But this is not what happens. Then I found in MSDN documentation: Assigning Nothing to a variable sets it to the default value for its declared type. If that type contains variable members, they are all set to their default values.
So I discovered that when I assign Nothing to a structure, all its members are set to their default values, instead of the structure itself.
Also, I tried to make st a Nullable type by declaring: Dim st As Nullable(Of Test) = Foo()
but, still I can't check if st is Nothing by using: If st Is Nothing Then
or If st.Equals(Nothing) Then
So, questions:
1 - Is it possible to assign Nothing to the structure and not to its members?
2 - How can I check if a return structure value is Nothing?
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Aug 11, 2009
In VB.NET, why can't I see a member of a structure when I make it a nullable type?
Example:
Public Structure myNullable
Dim myNullVar As Integer
End Structure
Sub Main()
[Code]...
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Apr 7, 2010
I have to write an application that consists of mainly one main form, but several different things I wanna display. Pretty standard I guess. So there is a menu, some controls, and the main stuff below (ranging form graphs, tables, dropdown boxes, print preview, etc). I would like to use it like one would use frames in html, design an object that is limited to a box or panel that I define. The literature I have does not give me a clear idea of how to do this (yet). The most obvious seem to be the use of MDI, open a predefined form with no borders, maximize it before showing and remove all minimize/maximize options. But that does not work so well. The form inside the MDI parent does not fit the size that is given for it when it is loaded. e.g.
[CODE]:......................
So my main question is: Is MDI the way to go here at all or are there better/easyer ways to achieve this? If MDI is the way to go, how do I sucessfully restrict a child form inside another object, without giving the user any opportunity to resize (i noticed that I have minnimize/maximize/close buttons, even if I disable them on the child forms themselves)
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Dec 5, 2011
I have a structure written in vb.net with all shared members. I need to override 'Equals', '==' and '!=' to avoid a warning.
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May 1, 2009
I am trying to figure out how to print specific members of a structure when I only have to pass the structure itself i.e.
Dim Point1 as PointF = New PointF(15,30)
Debug.Print(Point1) ' This will output "{X = 15, Y = 30}" by default
I am trying to figure out how I can do the same with my own strucutres, for example:
Dim Point2 as PointF2D = New PointF2D(15,30)
Debug.Print(Point2) ' This will output "ClassName.PointF2D.Point2"
How can I get my structures, when passed to a print statement, to print specific members of that structure by default? P.S. Please give another way other than overloading the .ToString function.
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Jul 15, 2011
how you init a variable when it is created by assigning the value on the same line in which it is declared. Is there a way to do this with members of a structure?
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Jan 19, 2012
When it comes to constructors in a Structure type ,it is fact that we can not explicitly provide the default constructor .It is provided by the runtime. Ok, another point that is applicable to C# language is that if we are defining a parametrized constructor then it is compulsory to initialize all fields . We can not leave any field uninitialized , since the runtime will not call default constructor if we are calling parametrized constructor .Its logically right , but in VB.NET language , actually you are free to leave any of the fields uninitialized in your parametrized constructor.
[Code]...
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Feb 3, 2010
Curious situation:
public class MyTextBox : TextBox
{
[code].....
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Aug 29, 2009
I 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]....
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Feb 6, 2010
How can I implement a sub routine or function that does a test for number validation in text fields and then also returns the value of the text fields (if they were valid) back to the main routine?
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Sep 21, 2009
Just suppose that I define a structure, and an array such as
Structure Person
Dim First_Name as String
Dim Last_Name as String
[code]....
Can I fill in my list of people using a single line of code for each record? Something like this, it doesn't work, but this shows the sort of thing I mean.
My_List(0) = {'John', 'Smith', 24, '555-1234'}
My_List(1) = {'George', 'Jones', 31, '555-8123'}
My_List(2) = {'Tom', 'Green', 40, '555-3434'}
It's easy enough to fill it in line by line. I could do that without problem. But I want to be able to look at the code and see the contents of each line. Doing it as above would make it easier to read.I could make it a multidimensional array of strings, rather than a structure.If it makes any difference I'm using Visual Basic 2005 Express Edition.
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Mar 21, 2012
I have a class (using a class rather than a structure only because I can set a default field value for the fields I declare in the class) and I'm using a web service that returns information (demographic information) in JSON. I am using LINQ to get the values of each "entry" from the returned list and in that, I have to parse through and pull out the actual data that I want.Here's how I have it doing right now (just a start, there are 44 of them total, thus my question which will follow the code):
Dim returnedStats = From ljo As Linq.JObject In returnedObject.SelectToken("results")
'
'
For Each stat As Linq.JObject In returnedStats
[code]....
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May 23, 2010
I 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]......
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Oct 12, 2010
In Vb.net I am trying to assign an array of structure to another array of same structure[code]...
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Jan 28, 2012
The company require an application that displays coffee usage information for the managers of CostaB Coffee. Sample data has been provided for last years (2011) monthly usage amounts in kilos and is as follows: 400.5, 450, 475.5, 336.5, 457, 325, 220.5, 276, 300, 320.5, 400.5 and 415.
Requirements: The main form will allow the user to enter and store monthly amounts in an appropriate data structure. It will enable the users to calculate the total usage for the 12 month period and average monthly usage. A further requirement for the application is for the users to be able to display the monthly totals in ascending (smallest to highest) and descending (highest to lowest) order of the monthly usage amounts. Utilise appropriate formatting for input/output and include appropriate error trapping and data validation in the application.
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Mar 29, 2010
In VB6 I can do things like this:For x = 0 to 99 if Text1.text(x) = "yes" then Check1(x).value = checked
Next x Here, both Text1 and Check1 are members of a control array.Is there an equivalent methodology I can use in vb.net?
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Jun 21, 2010
i've created a 2-dim image array but cannot assign images its members. i have done as follows
[Code]...
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Dec 4, 2011
I am trying to deserialize a JSON string that looks like so: {'type':'clientlist','client_list':[]} I am using JavaScriptSerializer() to do it. For some reason the JavaScriptSerializer() is choking on the member 'client_list'. It doesn't give very good info. The error it gives is:
[Code]...
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Jan 5, 2010
ok this is annoying, i've got a structure RInteger.
Private VAR_Value As Integer
Private VAR_Max As Integer
Private VAR_Min As Integer
[code]......
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May 5, 2011
I have a number of arrays (lets say two for the time being, but this needs to be scalable from 1-n). Each array represents a different "parameter" for the application I'm working on. I need to create a multidimensional array containing a set which represents each of the permutations of each of the "parameters". Effectively each row represents each permutation of the selected options for each "parameter" array.
For instance, say the first array of inputs is:
"Blue"
"White"
"Yellow"
And the second:
1
66
95
I need to create an array:
"Blue", 1
"Blue", 66
"Blue", 95
"White", 1
"White", 66
"White", 95
"Yellow", 1
"Yellow", 66
"Yellow", 95
The main work is in the "If Not (OutputTemp Is Nothing)" loop. Effectively I need to access the content in the first array with a "modulus" so that: (using the example above). I'm accessing the rows in the following method
OldArr,NewArr
11
12
13
21
22
23
31
32
33
worked it out.
Here is the code.
Public Class Permutation
Public TitlePrimary As String
Public TitleSecondary As String
Public Order As Integer = 0
Public Values() As Object
[Code] .....
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Jun 19, 2009
I'm trying to sort an array based on a structure but whenever I do this, it basically erases all the data in the entire array.I have verified that the array is populated correctly, it is when using array.sort that everything returns blank.
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May 27, 2010
I'm having problems with marshaling in VB.NET to C++, here's the code :
In the C++ DLL :
struct APP_PARAM
{
[code].....
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Dec 2, 2009
Here's the data I'm trying to work with
Spark Plugs
column 1: PR214,PR223,PR224,PR246,PR247,PR248,PR324,PR326,PR444
Brands:
column 2: MR43T,R43,R43N,R46N,R46TS,R46TX,S46,SR46E,47L
column 3: RBL8,RJ6,RN4,RN8,RBL17Y,RBL12-6,J11,XEJ8,H12
column 4L 14K22,14K24,14K30,14K32,14K33,14K35,14K38,14K40,14K44
Here is what i came up with for my code so far
Public Class frmMain
Private strSpark() As String = {"PR214","PR223","PR224","PR246","PR247","PR248","PR324", "PR326","PR444"}
Private strBrands As String(,) = { { } }
End Class
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Sep 12, 2011
I have two structrures
Public Structure PhoneScheduleEntries
Dim Count As UInteger
Dim PhoneSchedule() As PhoneScheduleEntry
End Structure
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Nov 9, 2010
After gathering the Machine names on the (sealed) LAn i am then getting the ip addresses, MAc address and Macine User name of each machine on the LAn..These details will need to be accessed seperately for use in the security testing and i am unsure how best to store the active data (though eventually in a database) Am i best to create a Multidimensinal arrayList or array(bearing in mind that all the data is convereted to "String" (arrays can only store one data type??) The data found on the live network is allways changing making an array a difficult choice? I have read some tutorials mentioning making a structure with the data and storing this in an arraylist but i dont know whether this will make accessing the individual data items (ip,MAc,HostName etc) a difficult procedure?
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Mar 29, 2012
I'm currently stuck on an issue regarding declaring an array of type short in a structure and having it default to 'nothing' rather than '0' after ReDim.'Declaring array and setting it's initial size
Private Structure Totals_T
Dim sTot_Desc As String
<VBFixedArray(10)> Dim iTot_Cnt() As Short
Public Sub Initialize()
ReDim iTot_Cnt(10)
End Sub
[Code]...
When calling m_Totals(0) the arrays returned have 10 records in the arry with sTot_Desc and iTot_Cnt having values of nothing in all records. When I ReDim m_Totals both the variables I declared in the structure(sTot_Desc and iTot_Cnt) are declared as nothing, it's fine for the String but I need the Short I declared to be declared as '0', which is what I thought happens when you ReDim. Can anyone see what's going on here and why it's declaring my variables as 'nothing' rather than defaulting to '0' for the short and ""/nothing for the string?
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Mar 26, 2009
I am once again struggling with my weekly project. I am assigned to write a program that converts a predetermined english sentence to both french and german. The code is to contain an Array and a structure. Also we have not covered retrieving array data from a TXT file, so we are to hard code in the array data. I coded the structure and the array, I added the array data, but am confused how to access the data. The examples I have found all deal with retrieving data from a TXT file. Can someone give me a nudge in the right direction.[code]....
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May 1, 2009
The more I read my book the more confused I get, as the programming example is not even close to what this assignment is I am to modify my existing project to keep track of an order in an array.
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