Put Contents Of C: Into An Array?
Feb 16, 2011
Am learning arrays at the moment and I have the below piece of code that goes through drive C: and displays the files in in a list box.
I want to try and expand it to use array.sort so that it gets the files, puts them into an array, and then I can sort by filename or file size. I have been rattling my brain over this - as to how do I put the files into an array.
Would like an explanation if possible as more interested in learning it rather than the answer.
Private Sub btnclick_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnclick.Click
Call Clearlist()
[Code]....
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Nov 11, 2010
i have an array of booleans whose current boolean values I want to preserve but add additional length to the array? How can I achieve that? My code looks like this:
Dim Array() As Boolean
Dim ArrayInterimShort() As Boolean
ReDim Array(119)
[code]....
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May 10, 2011
I am trying to create a code where I placed sets of numbers in an array.I'll use a masktextbox to have the user enter the numbers to match what's in the array. If the user enters the number, ex: social, and the data is correct (matches the numbers in the array), something happens if the number entered in the masktextbox does not match any of the number sets in an array then another thing happens.The masktextbox so far only validates format and gets number only, however, I want the number entered to match whats in the array.
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Feb 24, 2009
I am getting an error that I can't track down.
Elsewhere in the project:
Public teamname (numteams) as string.
In this form as a form load event
For i = 1 to numteams
Listbox1.items.add (teamname(I))
next i
I get an error message to try new but I can't figure out what it means.
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Dec 7, 2009
I am having a hard time displaying the contents of a text file that i read into an array. I read the text of the text file into an array but then i need to display it but i can't seem to get it. I also need to create a criteria to match whatever letter is entered into the textbox and display the contents of the file only beginning with that letter. I know i have to use a substring to read only the first letter but I can't even display the contents of the file from out of the array. Here is what i have so far.
Dim sr As IO.StreamReader = IO.File.OpenText("CRAYONS.TXT")
Dim color(50) As String
Dim arrynum As Integer
[Code].....
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Sep 6, 2011
I've got an array of type double with about 30 entries(numbers) in it.I need to multiply them all together. Sort of like "=product(A1:A30)" in Excel (formula).
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Jul 6, 2009
What is the best way to print contents of an array?[code]...
Is there a way to have a loop that finds the columns and then prints the contents?
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Dec 4, 2010
I'm a sorta newcomer to visual basic and programming in general and I'm having a hell of a time trying to figure out how to put a listbox into an array. And just so we don't make any assumptions yes this is for school and no I'm not looking for anyone to do my homework for me. I just need some direction on how to do this step so I can make progress.
Anyway, the program is a data of students and I gotta do the code for alphabetically sorting by last name in ascending and descending order. I have to make it so whenever the A-Z button is pressed it will sort whatever is in the listbox, be it 1 record or all.[code]...
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Feb 16, 2011
Am learning arrays at the moment and I have the below piece of code that goes through drive C: and displays the files in in a list box.
I want to try and expand it to use array.sort so that it gets the files, puts them into an array, and then I can sort by filename or file size. I have been rattling my brain over this - as to how do I put the files into an array.
Private Sub btnclick_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnclick.Click
Call Clearlist()
[Code]....
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Apr 2, 2010
I'm working on a program that has to get a set of images and then scan them to find pixels that match colors in an color array. Anyway I think I got everything working but how to load the images in as bitmaps. See the images are dynamic, they change there filenames so I can't call them with a static call like Dim bmp2 As New Bitmap("c:button.gif").
So I am using a loop to feed the images into an array for bitmap but thats not working, anyway that I can do this as, right now the program gets all the filenames for the images from a text file that is sent in to us. All I need to do is have the program check each image for pixels that match our color list. But I cant get the images into the bitmap array.
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Feb 26, 2009
I am having a hell of a time figuring out where I am going wrong in copying the contents of arrays to listboxes.
I am using textboxes to input team numbers and team names.
The code for that is as follows (used in a button after the data has been entered in the text boxes:
Teamname, Teamnumber and numteams have been previously declared as public variables (string,integer and integer) in a module as they are used throughout the project. Numteams has had a value ascribed to it in a previous form
ReDim Teamname(Numteams)
ReDim Teamnumber(Numteams)
Dim thisteam As Integer
[Code]....
I have had to put in the "" for the Teamname variable as otherwise I was getting an error saying "Value cannot be null". I am also not sure what is causing that.
When I do that, I get 0 in the listboxes for all the teamnumbers except the last one which is right and blank strings for the team names except for the last one which is also right.
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Apr 20, 2010
I have an array of info with each element containing a structured variable. Once the array is full of info it is passed to a procedure "DisplayStructure" which I'm trying to get display a MessageBox with the info in it, separating each element on a separate line. I can't get it to display even one element on one line. The structure is called Employee and what comes up in the MessageBox is Employee.Example or Example.Employee, can't remember which.[code]...
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Oct 23, 2010
in VB 2010 how do I display the contents of a 2 dimensiomal array. As a VB6'er, I miss the flex grid control and I can't seem to adapt to the Data Grid view for displaying array data.
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Nov 8, 2011
I'm trying to teach myself arrays as I have not extensively worked them. So I thought of a basic program to hash the contents of an array and list the output of the array word next to the hash value of it.
[Code]...
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Oct 28, 2009
I have this:
Dim split As String() = temp_string.Split(",")
''#feed all info into global variables
patient_id = split(0)
doc_name = split(1)
lot__no = split(2)
patient_name = split(3)
How do I clear all the contents of split() ?
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Mar 14, 2011
In Mastering VB2010 on arrays, a command is show indicating the reversed contents of an array can be assigned to another array.
ReversedArray = System.Array.Reverse(ArrayName)
I can't get this to work and part of the problem is how to set up (dim) the ReversedArray. When I enter this I get a squiggly line under the right side of the equation and an error message saying no data is produced by the expression.
I get the same error with a copy command:
CopiedName = System.Array.Copy(Name, CopiedName, 10)
How do I set up working code to reverse or copy the contents of an array?
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May 18, 2012
I'm trying to do something quite simple. I need to take a pipe-delimited text file and store the contents of the file in an array.
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Feb 6, 2009
I have a 1-dimensional array that is essentially is written to a csv file. My problem is that after I have loaded the entire array...I wish to write it to the csv file and I'm not sure how to set it up.[code]...
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May 25, 2010
I have developed a vb.net dll (.net 3.5) which does the following :
- I have data of several stock market companies.
- They are stored in several folders under a main folder.
- These files are random access files.
- There can be around 4000 files in total for example.
I wrote a program which reads a current csv file and stores contents in array. Then I store name and path of companies in folders (which I was talking about). Then I match one company from csv (stored in array) to companies in user's folder (again reading from array). If found I insert data in the file (random access file). This whole process takes for eg. 2 min my system. A similar program was written years ago by someone in powerbasic which takes slight less time if run one but if run for multiple csv files it takes only a few seconds doing the same thing for other files. When I do the same thing (by writing code to .net dll) and making a dummy app to run it, no matter how many times I run it takes same time. And is way slower than the earlier one (PB) one I was talking about. But if I paste the same code in my win (.net) app and not use .net dll then it runs a bit faster.
I need to show status so if I pass my form's label reference to .net dll and it updates it does that slow down process a lot. As I mentioned I am trying to process the files and it takes longer in .net. What should I do to get best performance? Unfortunately due to unexplainable reasons I cannot change the format or use a db. The files which I am reading/writing (random access files) are use by other products so I have to stick to that format. What I am doing is storing the location of those files in array so that I don't have to search folder again. that is not taking time. But opening reading and writing files is time consuming if I am doing it for few thousand of them. A similar program in powerbasic (developed years ago) runs fast. Running code thru .net dll is slower than running it thru program. Why?
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May 15, 2011
I have a queue and i could copy it to an array. How can i save the contents of the array or even queue to Mysql database
Public waiting As New Queue(Of String)
wait.Enqueue(InputBox("enter patId..."))
dim waitArray(waiting.count-1) As String
waiting.copyTo(waitArray, 0)
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Apr 21, 2010
I need a program that will display the contents of an array in two labels. I'v been having problems. Does anybody know how to debug my code?
HTML
' displays the first and last names in label controls
Dim names() As String = {{"Mary", "Jones"}, _
{"Susan", "Washington"}, _
[Code].....
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Oct 28, 2010
I have an Array called myDat
It contains Name and date of birth;
Joe
12/15/80
Tom
7/11/65
and so on ... Keeping the same order so they match I want to put the names in one array and dob in another
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Sep 8, 2010
Is it possible to display the contents of a two dimensional array vertically on a form in vb.net using listview, and if so how would I do it? So, if my array is declared as dim myarray (2,10) how would I display the contents vertically in listview.
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Oct 3, 2011
I'm trying to loop through an array of byte and copy the contents to a new list of bytes, and display them back. see the code below.
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim myByte() As Byte = New Byte() {65, 66, 67}
[Code]....
I want to see str1 as "ABC" but the out put i get is "A B C" (ie with spaces between letters) note: I have to copy(chunks) within a loop and get the result at the end, this is just a sample to reproduce my real issue.
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Oct 17, 2011
I would like to delete the contents of my array in .NET code. The examples I have seen say..[code]This is way too simple to be so complicated. I just want to delete the array between populations.
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Feb 6, 2012
I have a structure named StudentData, it consists of a studentname, an array of testscoresand the student average. There is also an array of structure objects for a total of 6 students. I have the header, column heads, the student names and the averages printing when I click the print page event. I have tried multiple ways of setting this up to get the test scores to print, these are the structure array variables. When I put in the code to process the arrays testscores, I receive a run time error that I don't understand
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Feb 19, 2012
I am unable to read from the text file in VB. I want to read the contents for text file and store them in array. See my code below and the text file. How should I read this text file.
'Purpose : This program will read student name & final marks for a set of students from the text file and then calculate & display class average, class standard deviation, number of students above class average, name of student with highest mark, number of students with A's(90-100), B's (80 < 90), C's (65 < 80), D's (50 - < 65) and F's (<50).Calculate for standard deviation of a set of numbers:Step1. :Find the average Step2. : Square the difference between each number and the average
[Code]...
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Jun 10, 2011
I am using streamreader to read and streamwriter to write, I have put the lines into an array
[text file contents]
Remove [ ] *****************
-----
;this is -----
------
;this is another -----
[end of example file]
I want to remove the lines that start with "****" and keep deleting lines until i reach ";" I thought this would be simple but im missing something and I don't want to put this array into a listbox it is being writen to a text file.
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Jan 12, 2011
I got a string array & I need to show the contents of it to a single label. It acts like a clock. The thing is I tried with everything I could but I failed. This is the code I've been trying. Its in vb.net. And theres a thread running to slow down the loop so I can display the contents in a label for 2 seconds.
Dim j As Integer
For j = 0 To readText.Length
label.text=readText(j)
Thread.Sleep(2000)
Next
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Jan 14, 2012
I have a text box that I will paste into a byte array, for example:
02 01 05 BF DD 03
All I need to do is when I click on a button, for the program to take the length of the array and store it in RCVDMSG_Length() and then take the contents of the text box and put it into a byte array RCVDMSG(). From there I think I can figure out how to manipulate the array... but it's this first step that I'm stuck on....
So far I have this in my Form:
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim RCVDMSG() As Byte
Dim RCVDMSG_Length() As Integer
RCVDMSG_Length = Len(TextBox1.Text)
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