Using Expressions To Perform String Operations (contains - Startwith)
Nov 8, 2011I'm trying to make a generic filter for data overviews and I've come across expressions. In that example, some expressions are used to do comparisons:
[Code]...
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Writing A Program Which Has To Perform Several Operations On Data Exported From A CAD Software?
Nov 11, 2010I'm writing a program which has to perform several operations on data exported from a CAD software.The amount of data to be processed is huge and even by simplifying the program at maximum it will still take about 10-15 minutes for average models.
The operations are performed on an array from the first to the last element. Let's say for a list of 10 elements (as example) that I start from element 1 and I finish when element 10 has been computed. I thus thought that since I'm working on a 8 processor machine would be convenient to make use of multi-threading. My idea is, for the case of 10 elements, to make thread1 working from 1 to 5 and make thread2 working from 6 to 10.I already wrote a working code for a 2 thread process which is working, but I want to extend the number of threads and eventually decide in function of the threads available. The basic structure is given below:
[Code]...
Office Automation :: Load Excel, Perform Operations And Then Show File?
Feb 28, 2010I'm trying to figure out some Excel automation. I have a form set up so the user can click on a label to open an Excel file (as a background process I guess) so the file isn't actually visible. Once they click on the "Convert to Count" button it will multiply all the values in Column B by 1,250 and put the output in Column C. Once it has finished this action, it makes the file visible so the user can choose to save it or not. Also, some users have Excel 2003 and some have 2007. Would it be possible to be able to load both xls and xlsx?[URL]..I must say I am very new with .NET and have a little bit of knowledge with VB6. I'm not sure where to even begin. I've looked up some ways to load an excel file but couldn't get it to work the way I need it to. Most of the ways I found were loading the file into a DataGridView. I don't want to use a DataGridView if I don't have to. Some of the files the users might be loading could have 10,000+ rows and that would take too long I think.
View 3 RepliesPerform Two Hashing Operations Concurrently On A Single File Without Reading The File Twice?
May 18, 2011I want to perform two hashing operations concurrently on a single file, without reading the file twice. Is there some way to share the FileStream between two synchronized hashing threads? For example:
Dim Stream As New IO.FileStream("...", IO.FileMode.Open)
Dim HashA, HashB As Byte()
Dim A = New System.Threading.Thread(Sub()
[code]....
Maybe some way of caching a stream? Trouble is, I don't want the entire file in memory at once (it could be many gigabytes in size) and I don't want the file read more than once, due to speed issues. I want the file cached only sufficiently to ensure that both threads can work.For example, suppose at some point in time, thread A had read 100k of the file, but thread B had only read 20k of the file. The portion of the file between 20k and 100k should be cached; but then progressively forgotten as thread B catches up. Then again, if thread B is too slow, we might still end up with hundreds of megabytes being cached.Maybe thread A should be made to wait while thread B catches up. Maybe the ReadByte() function of the stream should block for a while if one of the threads is too far behind?
Forms :: Get A Record And Then Use Value Of That Record To Perform Some Operations
Oct 20, 2011Basically i am making a software that will be interacting with a database (sql).Now what i wanted is a loop which after every 30 minutes, connects to the database finds some info and executes a bunch of statements.For the sake of testing i have made the timer tick at 1 second, and display a record in a database in a label continuously just to see if it works (i will later make the tick 30 min)Now this is what i have tried till now , it prints the record in database perfectly after 5 seconds, but after that just fails.[code]I want to infinitely make a loop in which after every 30 minutes has passed it would connect to the database get a record and then use the value of that record to perform some operations. And this has to be done in the background.
View 2 RepliesPerform "mkdir" And "move" Operations In Program?
Jan 19, 2012How to do a couple simple commands with VB.net syntax that I can do with DOS or batch files.[code]...
Thats just a simple DOS or batch command to make a directory with the date, and to move all .png files into that folder.
Part Of As String From A String Using Regular Expressions
Apr 17, 2012I have a string of 5 characters out of which the first two characters should be in some list and next three should be in some other list.How could i validate them with regular expressions? [code]My Strings are going to be: VBBEG, CSBEG, etc.My regular expression should find that the input string first two characters could be either VB, CS, HT and the rest should also be like that.
View 5 RepliesSyntax And Control Statements For String Operations
Nov 1, 2011VB syntax functions for string operations
View 2 RepliesUse Regular Expressions To Split A String?
Sep 1, 2010I have a little program that reads some text from a textfile. But now I need to read the following line[url]...
And then get the name, surename, and email adres from this string using regular expressions.
But I don't know how to do this with regular expression. Can somebody give an example how I can retrieve the email adres, name, and surename from this string using regular expression?[code]...
Regular Expressions - Behind The Scenes - Parse A String?
May 5, 2009What happens exactly when you use a regular expression? How do they parse a string so quickly?
View 2 RepliesRegular Expressions - Conditional Substitutions When Rebuilding A String
Nov 25, 2011Just wondering if its possible in VB.NET RegEx's if you can do conditional substitutions when rebuilding a string, in the sense that extra characters can be inserted if missing. I offer this bank account example, were we're trying to standardize a bank account into the format XX-XXXX-XXXXXXX-XXX, note the 3 XXX's in the suffix
[Code]...
Regular Expressions - Convert It Like This Alphanumeric, That Is Change All The Caps In The String?
Mar 21, 2012i want to use regex to perform the following:
i have a string of characters like AlphaNumeric
i need to convert it like this alphanumeric, that is change all the caps in the string.
Regex - Tokenizing A Complex String (a Snort Rule) With Regular Expressions (.NET)
May 21, 2011I need help from the Regex wizards out there. I am trying to write a simple parser that can tokenize the options list of a Snort rule (Snort, the IDS/IPS software). Problem is, I can't seem to find a workable formula that breaks apart the individual rule options based on their terminating semi-colon. The formulas that I have cooked up grab all options between parenthesis into a single capture group.
I am using the excellent RegExr tool at the GSkinner site with some of the below sample rule options from Emerging Threats (I parsed off the rule header -- that's easy to tokenize):
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I had to play with a few example regex's that work with quoted strings. Finally realized that I am staring at negative look-behinds that avoid quotes that are escaped. This seems to solve any other escaped character, too, because escaped characters only appear inside unescaped quotes.
VS 2008 : Error - Cannot Perform 'Like' Operation On System.Int32 And System.String"
Nov 2, 2009I'm trying to use DataView.Rowfilter and I'm getting an exception which says "Cannot perform 'Like' operation on System.Int32 and System.String".
Here's the code...
Dim str2 As Double = CDbl(searchSTR)
Me.shipperDV.RowFilter = fieldName & " LIKE '*" & str2 & "*'"
DB/Reporting :: Error: Cannot Perform '=' Operation On System.Int32 And System.String
Mar 6, 2010I wrote the code below which calculates the length of a line on the form and save record. An error occurs when the programme tries to save the record. It gives me "Cannot perform '=' operation on System.Int32 and System.String" error. I checked the data type of "ID"(int), "Microscope"(Varchar), "Magnification"(int) and "Calibration"(Decimal), and they are fine so far as I know.
Code:
Private Sub btnEnd_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnEnd.Click
'Check if the length textbox is not empty
[Code].....
Cant Count System String - Evaluate Exception Unhandled "Cannot Perform '=' Operation On System
Nov 3, 2009Here is the code I am working with, everything works fine up until last line then i get evaluate exception unhandled "Cannot perform '=' operation on System.Int32 and System.String." My eyes are going blind trying to figure out whats wrong, if I understand correctly it cant count system string and REO is a string value.
The thing i have done this before ,count that is. I know you cant average strings and some other function but i have been able to count.
d Dim comm As New OleDb.OleDbCommand("Select * From " & Me.OpenFileDialog1.SafeFileName & " Where Status <> 'S'", con)
Dim dalist As New OleDbDataAdapter(comm)
Dim comm1 As New OleDbCommand("SELECT * FROM " & Me.OpenFileDialog1.SafeFileName & " Where Status
[CODE]...
Cannot Perform '=' Operation On System.String And System.Int32
Jan 27, 2009For this code, I'm trying to have it pull the ID of the doctor from the database and only show their patients. I keep getting this error when I try selecting one from the list though, right at the red section.
[Code]...
Cannot Perform '=' Operation On System.String And System.Int32
Nov 4, 2010I get an error "Cannot perform '=' operation on System.String and System.Int32" on the following code:
VB.Net Code:
Public Sub board2_OnGameWon(ByVal sender As Object, ByVal e As EventArgs)
If Not board2.isCheated() Then
Dim time As Integer = board2.getGameTime()' I have tried changing this to String
[code]....
The exception is in the lines where I 'Dim betterScores' above. The idea is that when the player wins a game their score is placed and held in the betterScore variable. It is then written to an xml file later on.
I have a Difficulty Menu item (System.Windows.Forms ToolStripMenuItem) containing 4 choices, 3 of them work but one doesn't. The one that doesn't work is "1.0 (Normal)" and in the Sub New is "adjustDifficulty(mnuDifficulty100)"I have copied some other subs that are associated with this code below.
VB.Net Code:
Public Sub New()
' This call is required by the Windows Form Designer.
InitializeComponent()
[code]....
Error "Can Not Perform Like On Int32 And String"
Feb 8, 2011I am using row filter with a like operator on a data view but getting error "Can not perform like on int32 and string" How to solve it
View 1 Replies.net - Add ProgressBar While Making Operations?
Feb 10, 2012my update script in VB.NET, i'm making some stuff, and I want, while all funcs are executed, a progressbar to be displayed? How to do that? Here is my execution sub:
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Add Operations From A Listbox Into A Timetable
Dec 19, 2011I'm new in VB.net but I'm trying to make application (planning-game). The game is about showing students the planning 'complexity' of a operation room in a hospital. I created a listbox which randomly shows 5 operations. But now I would like a function which makes it possible to add a selected operation to a timetable. The timetable has blocks of 30 mins (example 08:00 - 08:30, 08:30 - 09:00 etc..). This because 1 type operation takes 1 hours and 1 takes 1:30 hours. Now I have given the operations a value by using a label. [code]
View 1 RepliesImproving The Assigning Operations Of .NET?
Dec 10, 2009I have an idea about improving the assigning operations of VB.NET (maybe other .NET languages too.) It is similar with "With ... End With" block:
[Code]...
So we don't type "Some Text" every time. Do you think does this idea work? Maybe in the future we can see something like that?
Listview1 To Listview2 After Some Operations?
Jan 6, 2012Ime1 = ListView1.SelectedItems(0).Text
ListView2.Items.Add(Ime1)
If MkCal1 < 0 Then
ListView2.Items(0).SubItems.Add("Nepoznato")
Else
[Code]...
The problem is when I click the next time to button, listview2 add only first rows from listview1
Make The Operations Run On Another Thread?
Sep 13, 2009I have an application in which I am running a separate thread.
Dim thread As New System.Threading.Thread(AddressOf Main)
thread.Start()
However, the thread makes reference to an textbox named Output, and it generates this error upon execution:
System.InvalidOperationException was unhandled
Message="Cross-thread operation not valid: Control 'Output' accessed from a thread other than the thread it was created on."
Source="System.Windows.Forms"
(message shortened for space)
How can I make the operations run on another thread, but still use the Output object? I cannot call a subroutine to do that for me, as it generates the exact same error.
The method called is AppendText, by the way.
Operations On The Second Child Node?
May 23, 2010I have 2 child nodes under a particular node. I want to do operations on the second child node. The code goes like:
Dim pChain As XmlNodeList = pChainDoc.ChildNodes
Dim processName As String = ""
For Each pNode As XmlNode In pChain
processName = pNode.SelectSingleNode("//Name").InnerText
[Code]...
Used Them In VB6 For Database Operations MsAccess?
Dec 22, 2011The following commands I used them in VB6 for database operations MsAccess which are, kindly DataBaseDataSet corresponding commands in VB10?
- Data1.Recordset.FindFirst query
- Data1.Recordset.NoMatch
- Data1.Recordset.MoveLast
- Data1.Recordset.AddNew
- Data1.Recordset.Edit
- Data1.Recordset.Delete
- Data1.Recordset.Fields("nome campo") = dato
- Data1.Recordset.Update
Using System.IO Namespace For FTP Operations?
Aug 19, 2010I have a few syncing routines that I'd like to use for FTP uploads. However they all use the functions in the IO namespace, and I was wondering whether I could use it to access distant files stored on an FTP server.
View 1 RepliesVS 2005 : Creating A Dll For XML Operations?
Aug 19, 2010I want to create a dll in VB.NET. The functionality of the dll is that it should include all the xml operations. Any application that uses this dll will just pass the node that has to be selected. The dll will accept the node name and search for the node in the xml file and return the details of the node. For example:if the xml file is like
<Node1>
<Node2>
<Node21 Attribute1 = "Value1" Attribute2 = "Value2" />
<Node22 Attribute1 = "Value11" Attribute2 = "Value22" />
[code]....
If the application which uses the dll calls a function named readNode(Node3) which is defined in the dll, then the dll should be able to retrieve all the details of Node3 including subnodes and theire attribute values and return it to the calling application. All the XML operations are to be done in the dll. The calling application will just call the method in the dll by passing the node name and it should be able to get all the node or attribute values.
VS 2008 Bit Conversion Operations
Apr 1, 2011In my API class I encountered a lot of times I had to Get/Set low/high order <something> of <something>. For example, get the low order integer from a long. I made a few functions for this: [code] Before I start using these functions permanently, I come to ask if it contains any bugs, especially because of the Unsigned/Signed issue.
View 15 RepliesAdd Calculator Operations To A List View?
Jul 22, 2011I have a basic calculator that Multiplies A and B to give a result of C.I want to be able to once multiplication occurs then to add the data to 3 column listview where in Colum 0 the value of A will be entered, Column 1 the Value of B and Column 2 C.For every operation done then to follow on the next row and so on until Memory Result button is pressed, which would mean the end of transfering the data.
View 1 Replies