Creating A DataTable From An Array Based On A Structure?

Apr 26, 2012

I have a array based on a structure that I want to build a datatable from. Here is what my structure looks like currently,

Public Structure QRQFiles
Public Complex As String
Public DescriptiveName As String[code]....

Since I have a structure with in the structure will I have to define two datatables to represent this?

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IDE :: Creating An Array Of A Structure Based On Existing Project?

May 1, 2009

how to write the code for my project.I am to base my new project on an existing one(existing one has code that works 100%)and create an Array of a structure that bascially holds the information from a summary form AND the totals from an AddToOrder_Click event. If you are still with me)... I cant figure out what the code is for my structure and Array so that I STILL have a Summary Form but I have an array that shows when I click my PrintPreview. So an Array is basically a "space" that holds information, like my summary form except it doesnt show until I click PrintPreview right?

If I just wanted to show the table then my code belongs in the PrintDocument1_PrintPage to show the array but the actual structure code belongs in the Click_Event of my AddToOrder? Please Please understand I AM NOT asking for anyone to write my code, basically I am asking for some clarification on what exactly creating an array from a structure is and therefore determing where the structure is to be placed in my code..

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How To Sort Array Of Structure Based On Highest Value

Apr 10, 2009

I want to sort the individuals according to their fitness values descending.
' Declaring a structure
Public Structure AnIndividual
Dim XCoord() As Integer
Dim YCoord() As Integer
Dim FitnessValue As Double
End Structure
[Code] .....
Each individual has a fitness function and has its own X and Y coordinates. I just want to say if individual six (for example) has the lowest fitness value then rank this individual the first one and so on for the rest of individuals.

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VS 2008 Set A Dynamic Array Based On Own Structure?

Jul 20, 2009

ArrayList is a generic structure. Let's say I have my own structure (contained of Boolean+string+int). I want to set a dynamic array based on my own structure. How....?

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VS 2008 Trouble With Multidimensional Structure Based Array

May 27, 2010

I currently for the life of me can not get this to work.[code]Days(num).openTime(0) = New Date() 'Which gives the same error as openTime @ 0 has not been created as an array object (I'm assuming)Which leaves me completely lost because I've never had issues assigning initializing 1-dimensional arrays but this i just confusing the heck outta me. If anyone knows how I can initialize the 2nd part of the array (Days(num).openTime(0)) I would love to learn from you.

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Creating Array Of Structure Type - Marshaling Error

Jul 23, 2009

I have to create an array of structure type in VB.net. but I am getting error while marshaling this error. I have to pass this array of structure type in to Dll function.
Code:
Structure declaration:
<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Ansi)> _
Public Structure dx_entry
<MarshalAs(UnmanagedType.ByValTStr, SizeConst:=10)> _
Public dx As String
[Code] .....

I am getting the following error:
An unhandled exception of type 'System.ArgumentException' occurred in Audit_Demo_2307.exe
Additional information: Type dx_entry[] can not be marshaled as an unmanaged structure; no meaningful size or offset can be computed.

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Adding Rows To A Datatable Based On Elements Of An Array

Feb 4, 2010

I have a data table in a loop that adds rows on each loop. During the loop i collect an array of unknown size. At the end of the loop i want to add a new row to the datatable with eachelement of the array as a field.[code]I could hard code this if i knew how many item would be in the array but i dont.Is there any way i can loop through the array and append the value to a row?

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Creating Dynamic Array Based On SQL Count?

Sep 15, 2009

I have a SQL database which I'm running a query against to return a list of names - eg using "select names from table"I would like to add all of these names to an array so I can use them later. To do this I would need to use a dynamic array as the number of names returned could be anything.Apart from first running "select count(names) from table", getting a value and then Redim'ing the array on the count is there another method I can use.I've seen there's a dataset row.count? Can I somehow use this?

connection.Open()
reader = command.ExecuteReader()
While reader.Read()

[code]....

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Populate An Array While Creating A Datatable?

May 5, 2010

I want to modify this function to populate an array with each item in the database.

I have tried various options, but I just can't get it to work[code]...

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Populate An Array While Creating A Datatable / Breaking It Up Instead Of Fill?

Apr 11, 2008

I want to modify this function to populate an array with each item in the database.I have tried various options, but I just can't get it to work

Private Function ConnectMe() As DataTable
Dim conn As String = "Server=192.168.0.36;Port=3306;Database=wswc;Uid=r oot;Pwd=Jack"
Dim cmd As String = "SELECT * FROM st_users"

[code]....

Instead of fill, I want to one by one add it to the dataset and also an array?

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Converting Structure Within Structure To Byte Array For Socket

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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Loop Datatable And Select Checkboxlist Item Based On The Datatable Field Values

Aug 18, 2011

I am trying to display value of the field ("UserID") for every row exists in datatable to checkboxlist(make the checkboxlist item selected).

I used for loop, but only the field value from last row of RoleUsers table is selected in the checkboxlist.

Here is my code

Private Sub DisplayRoleUser()
Dim conn As SqlConnection
Dim cmd As SqlCommand

[Code].....

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Arraylist Of Structure Within Array Of Structure?

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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Assign Array Of Structure To Another Of Same Structure?

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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Creating DataTable And Copy Existing DataTable Schema?

Feb 17, 2011

I'm using vb.net 2010.I have a DataSet with a Table and data. MyDataSet1 which contains Table1 I want to create another table that is the same as the Table1 but without data, but it should have the columns, etc.

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Array.Sort Returns Blank Data When Sorting A Structure Array?

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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Create Treeview Node Based On Url Structure .net

Oct 28, 2011

am trying to pupulate a treeview nodes base on directory structure like this

[Code]...

The above code works for add base/parent node say i have a urllike this [URL] in this case, it should create a child node dir2 in parent node dir1 am getting confused add child nodes to the existing nodes

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IDE :: Create Classes And Forms Based On A Database Structure?

May 10, 2010

I am creating an Add-In that I want to create classes and forms based on a database structure. I can't find any information anywhere on how to programatically add code to classes. I know I can write out the files and add them to a project, but that would limit what I can do in the future. I would like the possibility to update a function in the future which would be impossible writing out a file and loading the whole thing back in. It would destroy any modifications made to the class, and since this Add-In will only be creating a framework, there will usually be modifications.

I got this line from the macro recorder:DTE.ActiveDocument.Selection.text = strDACode

But I like to keep Option Strict on, and this is late bound according to the IDE. There seems to be very little help on the IDE and how to use it creating Add-Ins. If I overlooked something please point me there, but I can find nothing. I don't know if it can be done, but I was able to do it in an Add-In for VB6.I would also like to add controls to a form, so if anyone can point me somewhere where it explains

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Passing A Structure Containing An Array Of String And An Array Of Integer Into A C++ DLL?

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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Copy Data From One DataTable To Another With Diffrent Structure?

Apr 23, 2011

I am copying data from DataTable to another DataTable with a structure.I have to hardcode coulums number in the loop and copy the data in object array.[code]...

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Getting Array Of Selected Datarows From A Datatable.select Into A Datatable?

Apr 8, 2009

I am getting array of selected datarows from a datatable.select.I use the commands below to get that array or datarows

Dim foundRows() As DataRow
strExpression =

Here is what I tried.I have looked at examples by MS but they all just write to the screen and I have no interest in that.

For Each rowWork In foundRows
dtWork.Rows.Add(rowWork)
Next[code]....

"LineOfBusiness = 'CPP'"

foundRows = modXchange.pdtWork.Select(strExpression)

Now, I want to place the rows from foundrows into an empty data table.I did what I thought was the obvious but that only returns a bunch of rows with no data

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Save DataTable Structure And Data Into A Database Table?

Mar 10, 2010

How to Save DataTable Structure And Data Into A Datatbase Table..

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Four Columns Of Data In A 2d Array Or Structure Array?

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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Collection(Of T) A 0-based Array Or 1-based Array?

Feb 26, 2009

If it's 0-based, how can we add a placeholder to make it 1-based?

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Creating Structure In 2008?

Apr 3, 2012

how 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.

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Structure With A Structure Array?

Sep 12, 2011

I have two structrures

Public Structure PhoneScheduleEntries
Dim Count As UInteger
Dim PhoneSchedule() As PhoneScheduleEntry
End Structure

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Structure Without Creating New Thread For Every Iteration

May 8, 2011

I'm trying to create a structure wherin I have got 1 mother thread and 2 child threads. The child threads get variables to work with from their mother thread and after completion they report back to the mother with the resulting variables. I'd like to be as efficient as possible so creating a new thread every time a thread has finished it's work is kind of a no-go. How can I create this structure without creating a new thread for every iteration?

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.net - Convert A Datatable To A Data Structure To Be Read By MS Stacked Chart Control?

Aug 18, 2010

I have a chart control (stacked chart to be more precise) and a datatable that contains 3 columns. I want to bind them into a stacked bar chart. below is what the datatable looks like:

[Code]...

I would have the Resource column as the x-axis, and the value (hours worked) of each Queue as the y-axis (stacked)I've tried just binding normally and I'm getting an error saying that it's the wrong data type.

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Creating A Lot Of Class And Structure Types For A Project?

Oct 12, 2009

Is there any performance hit (or other problem) to creating a lot of class and structure types for a project? I'm not talking about the number of objects existing in-memory during runtime; rather just defining a lot of object types during design time. I find myself making a lot of small classes and structures that are little more than simply packaging a few related variables together.

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Replacing A String With Array's Data Based On Array's Index?

Jul 13, 2010

i have an array contains a-z.Then i have a textbox and when click on the button, it will replace the text inside the textbox to the index number of the array.Example, from "abc" will become "0 1 2" The code below do the job.how to do so that i can replace the text inside the textbox from "0 1 2" back to "abc" based on the array?

Dim txtKey As String = readKeyTxt.Text
readKeyTxt.Text = ""
For Each b As String In txtKey[code].....

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