I have 2 arrays X(n) and Y(n). I would like to pass them between subroutines:
Sub sub1()
...
call sub2(X,Y)[code]...
The problem comes when n can be changed in sub1 say a textbox. How do you transfer an array of variable length between subroutines?
I am new to VB.NET but used to write a lot of code in VB 6.
How do i declare a variable length array in VB.NET?
In VB6, i would just put:
Dim sArrayList() As String
But when I do that in VB.NET, it highlights my array name and says "unused local variable". What do I need to do to get it to work without an error?
I'm trying to call the GetInterfaceInfo Windows API - it accepts a structure as one of its parameters and this structure has a member that is an array. The API populates the contents of the array when it is called and there can be any number of items in the array. How can I define such an array in my structure?
If I just use a normal .NET array like so then the program just crashes (no exception thrown)
<StructLayoutAttribute(LayoutKind.Sequential)> _
Public Structure IP_INTERFACE_INFO
Public NumAdapters As Integer
[Code]...
and this works fine, but the problem is I have to define the SizeConst attribute as you can see to something large (64 in this example) so that the API doesnt fail because the array wasnt big enough. Firstly this is a waste of memory as in most cases the number of items the API sticks in the array will be less than 10, but secondly if there was ever a case where the API wanted to put more than 64 items in then it would fail.
Using ReDim to set the length of the array at runtime seems to have no effect, and that SizeConst attribute has to be set to a constant value so there's no way I can dynamically set it.
I have a problem when debugging a code. On top of class I declare an array, and the length of array is an integer variable which is applied value below declaration of array.
E.g. class declaration
Dim array1 (2, integer) as string
Public Sub
integer = 5
End Sub
So basically, array is created with integer being 0 or whatever, because it is declared before integer was assigned a value. But the problem is, I need it to be declared at class variable so I can use array in different subs.
I have 2 arrays X(n) and Y(n) where n can vary programmatically, no set value. I want to pass these two arrays between two subroutines.
Sub sub1()
...
call sub2(X,Y,n)
end sub
sub sub2(x,y,n)
...
end sub
I want to know how to prepare the arrays for the "call sub2" and how to extract the arrays in "sub2".
I'm having trouble with passing an array between subroutines
I have an array called "lines" which is loaded from a text file and then edited according to a series of checkboxes within one subroutine. Each line in the array is essentially a line from the text file
I then need this array passed to another routine so that it saves to a new text file once the save button is pressed. (in this case just the top 5 lines)
At the end of the section that creates the array i have placed this
From File Edit
Call Savefile(Lines)
The section of code below is from the section once the button is pressed
Save Code
Sub Save_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Savebutton.Click
[Code].....
initialize an indefinite (eg. Decimal) array without setting boundaries on the array length?
View 2 Repliesbest way to sort an array of doubles into a lowest to highest array of the same length.
View 10 Repliesgiven the following Sub, how would I initialize byte array 'temp'to zeros and give it the length of the incoming byte array passed into the subroutine?
Sub ReceivePacket(ByVal buffer As Byte())
Dim temp() As Byte 'initialize to zeros and length of buffer
temp = buffer.Skip(17).ToArray()
End Sub
when i transfer the bytes sent by the client program to a string the string length is affected.when i put the bytes sent by the client program to a message box. it returns the corrrect text. but when i check the length it will return 8192 or higher. but the actual size is just 5.
My Code
Dim tcpClient As TcpClient = tcpListener.AcceptTcpClient()
RichTextBox1.Text = RichTextBox1.Text & vbNewLine & "Connection accepted."
' Get the stream[code]....
How Do I Transfer A Variable From One Form To Another? I'm trying to transfer an integer variable and an array of string from my main form to my other form, how do I do it? So far I've been trying with functions but it won't work here's my code for the first form: [Code]
View 1 RepliesI want to transfr the values of 1 variable to another form i have tried declaring it public in module and still its getting the value 0.. my code is similar to this one..i have a variable mult in form 1 and it is storing the value of a * b a and b are getting values form user through text box..
mult = a * b
now i want the value of mult in form 2..
I am working on a code that should capture the color of a pixel in a bitmap and then check if the 8 surrounding pixels have the same color. If the checked surrounding pixel HAS NOT the same color it will be ignored, otherwise if it HAS the same color, it should check for its own 8 surrounding pixels and so on.
To do that, I have created an array that starts with a single entry (the x,y coordinates of the initial pixel). So, when a pixel with the same color is found it is pushed to the end of the array. I used a for each loop supposing that VB would keep looping until the end of my array - and since it is growing, the last position of the array would be always pushed until I have not more pixels to be checked.
The problem is that VB is not respecting it, and is considering my array as if it had just 1 entry. Seems that it catch the size of the array when it enters the loop, and regardless the fact I have pushed new items to the array it doesnt keep looping it.
How can I force VB to update the end of array position while looping it? Although I think it wouldnt be necessary, here it goes the code I have so far...
Code:
[Code]...
This adds 1 and 2 to list. My question is why does the first element in the 2d array determines the length of an array and if we want to get the length 2nd index then what will be the method for that?
I want to take the data gained from a button press on one form and take that data and display it on another form. So it's like whenever the button is pressed
Score = 0
Then I want to transfer that data to another form into a label. I have VB.Net 2003.
I have an integer that is storing the result of a division between two numbers. I usually receive an result that looks like 5,2496874654. How can I limit the variable length so it looks more 'approximated', like 5,25?
View 11 RepliesMe and my coworker were discussing variable names today because we both have completely different naming conventions...but we were wondering is the a limit on the length of the variable name??? is it posible to do this: dim
ItsPeanutButterJellyTimePeanutButterJellyTimePeanutButterJellyPeanutButterJellyPeanutButterJellyWithABaseBallBatPeanutButterJellyPeanutButterJellyPeanutButterJellyWithABaseBallBat as string = "lol"
G10L41T20P0C15D1.2S1I0E1.2H4.7262K0.J0Q1450N000000 01
G10L41T21P0C19D0.87S1I0E0.875H5.9386K0.J0Q884N0000 0001
G10L41T22P0C2D0.53S1I0H7.3233K0.159B0J0Q236N000000 01A0.
[code]......
I need to truncate to sertain amount of decimals for example : dim x as double;x= 6.98455 textbox1.text = x that mean textbox1.text= 6.98455 I need textbox1.text= 6.99
View 4 RepliesIs it possible to have a 2 dimensional array of a type struct such that the size of the last dimension can vary by element of the first?eg:-structure mydatadim param1 as integerdim param2 as byteend structuredim main_array(100,10) as mydataThen at anytime change the size of the last dimension like...redim main_array(10, 5)redim main_array(15,7)leaving all other array entrys' last dimension unchanged and independent??VB2005 starter
View 3 RepliesI try to determine the lenght of a string variable, but get the wrong outcome when using: testje = Len(testSTR). When I insert the following line of code: testje = testSTR.Length the answer is still wrong but when I click "Length" I see the correct value. How to get at that value, so I can use it?
View 11 RepliesI am wanting to create 2 tables called Stores and Locations. Locations is a table containing a unique location_code and a location. Stores is a table containing a unique store_code a store name and a variable number of location_code's and a relationship is set up between the 2 tables.
creating the Stores table in particular the location_ code. Can rows in a table have differing numbers of columns? as a particular store type could be in many diferent locations. I feel it should be possible to set up some sort of array of Location_code's in the Stores table.
How do I declare a fixed length variable array?[code]...
View 1 RepliesHow do I declare a fixed length variable arra
Structure MyInformation
<VBFixedString(4),System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValTStr,SizeConst:=4)> Public ReturnStatus As String
[code]....
Using VB or C#, I am getting a string of variable length from the database. This information is sensitive information that only certain users will be able to see.I have two cases that will use the same logic (I think).scenario 1: replace all characters with xscenario 2: replace all characters with x except the last 4 characters (assume length > 4 - this check is being done).I thought that this would be easiest using Regex.Replace(input, pattern, replacestring). As opposed to a lot of string handling with substrings and forcing a length of 'x's.
View 2 RepliesWhile using the Socket.Receive method to receive messages through network, you should define a variable as the buffer and you have to specify the length like this: Code: Dim _ReadBuffer As Byte() = New Byte(LENGTH) {} My question is: What is the bad thing about increasing the length of this variable even if the received messages are sometimes shorter? (i.e. if some body let it 10000).
View 1 RepliesI have an existing vb.net application which uses a home grown database. The database has over 60,000 unique multi-field records in it.The user can search in each field using drill-down to find a record, and then can add that record to a separate database.(60,000 collectibles described in a master database. User can drill down by category, manufacturer, year produced, etc. to find a record and then add it to their own 'collection', 'wanted', 'have for sale', or 'spares' database for record keeping.)
Instead of having them drill down, I would like for them to be able to perform a search and have all of the results (any amount of matches from 1 to 60,000+) appear on a scrolling form with a checkbox next to each so that they can simply check any that they want and do a mass add to their list databases.
The part I cannot figure out is how to have vb.net (2008) create a variable length scrolling form with the results, and how to identify the checkboxes (generated by the system for search matches) to see which, if any, have been checked by the user.
How i can fill 2-way array (integer type) of records from my tabel from file data base. Tabel is also integer type ?? i try many way but i can solve this problem . Pls help me .
ok question was not clear i wona copy all records from one of table from db in file (mdf) to 2 way array but only 6 from 9 columns of this tabel .
I have been programming in VB6 for a while now and am gradually trying to get to grips with .Net (VB 2005)I am tryng to transfer some of my programs from VB6 to .Net with some success but have got a little stuck on trying to transfer what was a control array to .neto try to sort this i have set up a form in VB6 with 4 Vscroll bars and 4 Text boxes.Vscroll1(*) & Text1(*) where * is 0-4when you change the value in any scroll bar then the associated text box value changes.
Private Sub VScroll1_Change(Index As Integer)
Text1(Index).Text = VScroll1(Index).Value
End Sub
[code].....
I just don't understand why (intValues.Length - 1) is used: to be precise why the ( - 1 ) is there?
Dim intValues(25) as integer
For intCount = 0 to (intValues.Length -1)
MessageBox.show (intValues(intCount).ToString())
Next
