Windows - CPU Usage Goes To 100% While Reading From Excel File?
Apr 5, 2012
I created a VB.Net application that will read from excel file and put the data into a table.I used an excel sheet which has 3 columns and 65000 rows.Before starts reading the excel my machine's CPU Usage is around 15%, but during reading the CPU Usage jumps upto 95%.
Private Sub readFromExcel(ByVal fileName As String, ByVal sheetName As String)
Dim connString As String = "data source=XE; user=test; password=test"
Dim con As New OracleConnection(connString)[code].....
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Sep 1, 2010
I saw some 'offsets' such as: 0x006E71A0and some that were like, Game.dll+8E336CI'd more so think the 0x006E71A0 and the Game.dll+8E336C are among the same format, so i'd like to use that.I have also read somewhere(this could be wrong) that the memory addresses formats are different between VB, C#, and C++.
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Sep 26, 2010
I'm trying to read an Excel xls file into a dataset with OLE. I can do that, but it's loosing data. The sheet is formatted with merged cells on the first 11 rows and after that it's just a table. I need to read this with OLE, because the server on which this web-application is working does not have Excel installed.
If I remove the first 11 rows with excel, then save it and then let my program read it, all is fine, but with those rows, it's ok. The excel sheet has header names in row 12. After the read in to the dataset, some of those cells with the header names are empty. I assume this is caused by the formatting. Is there any other way to open and read an excel file on a server without Excel or expensive dll's? Is it possible to open the xls file with OLE, delete the first 11 rows before using da.fill(dataset,tablename)?
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Dec 7, 2009
I am having problems reading the contents of an excel file into a combo box I am using the following code but the only thing that is populating the combo box is "System.__ComObject"
XLbook = GetObject(pthSup & "offices.xls")
XLsheet = XLbook.Sheets("Offices")
Dim i As Integer
[Code]....
I am relatively new Visual Basic and programming in general and I am trying to update a program I wrote for AutoCAD in VBA to the .NET frame work
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Aug 15, 2011
just as I would read an SQL file in order with code such as:DCReader02 = DCCommand02.ExecuteReader()While DCReader02.Read() End While I am looking for the equivalent code to read each line of an Excel file until end of file. The Excel file was opened with
Microsoft.Office.Interop.Excel.Application / Workbook / Worksheet coding.
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Jan 22, 2010
I want to get a value from 12 excel sheet. is there any way that i get the values without opening the excel sheet? I am using vb.net. if there is a way to read values without opening the excel file.
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Mar 4, 2010
i am not getting the integer values in dataset while reading from an excel files the field which is integer will be showing as NULL.
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Oct 5, 2011
I already know the basic procedure of how to read specific cells of an .xls file using VB.NET but I can't figure out how to automatically get all the data from such a file.Basically, I'm obtaining the data like this:
Dim xlApp As Excel.Application
Dim wb As Workbook
Dim ws As Worksheet
xlApp = New Excel.Application
[code]....
In this case, I know that there will be content in the first 10 rows of the columns A, B and C but what would I have to do if I had a huge document whose size and content might even change from time to time? I know that there is also an attribute ws.rows.count but this always returns a big value like 60000 even if only a few rows are occupied.So basically, I'm looking for a simple way to loop through all the used rows of an Excel file with the possibility of accessing each cell in that row.
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Sep 6, 2011
I am new to VB.NET and I am trying to read a line of data from a .csv file. For some reason the line of code below is returning "System.__ComObject", why? I verified that the cell contains "4/8/2011 9:20".
Me.cv_wks.Cells(i, "G").ToString
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Sep 28, 2011
I am reading in data from an excel file that is only viewed inside the program. This excel file is being populated by data from multiple PLCs (7) through DDE links via RS Linx Gateway. I would like this data to be written to two different excel files and specific sheets within those so that it can be viewed later on.
My program has a form that will allow the user to view the data live, meaning they look at the first excel file from the program so that they are not able to edit the DDE links or change the file in any way. The other excel files (there will be two, one for good parts, one for bad parts) have specific sheets for each part and each tester station. For example, if the part is a ABC part, and it is a good part, and it was tester on tester station 1 then it needs to be saved to the good parts excel file, in the ABC sheet and in the good tester station 1 sheet.
If part XYZ comes along and is a bad part (fails testing) then it needs to be saved to the bad parts file, the XYZ sheet and the bad tester station 1 sheet.I might have added more detail than is needed to solve the problem but I thought I would add it anyways to help you all understand my problem a little better.
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Feb 15, 2012
I have this program that uses OLEDB connection to import excel file to data table then use it in other functions.Now I have this question: What are the possible limitations of OLEDB when it reads the Excel file. The File is on xls format, and I want to know if there is such limitations(for example: It has limitation in reading value on a cell).
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Sep 1, 2011
im usinf Gembox to read Excel files.I'm copying the fields to a datatable, so i have to add the columns to the datatable first.
Therefor im using this code:
For i As Integer = 0 To objWorksheet.Columns.Count - 1
objDataTable.Columns.Add(i, GetType(ExcelCell))
Next
But objWorksheet.Columns.Count is 0 even if theres data in 4 columns.
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Mar 29, 2010
currently i need to use 4 different texts files in order to read data and run my program, is there any way that i can just use 1 text file or 1 excel spreadsheet? here are my codes now.
Dim File1 As New System.IO.StreamReader("C:Documents and SettingsUserDesktopWindDirectionLanding.txt") 'Calling out the file.
Dim File2 As New System.IO.StreamReader("C:Documents and
[Code]....
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Jan 12, 2011
I am trying to open for reading a Windows file (used in XP through 7) for reading. However, even though I provide a complete location ("C:Windowssystem32configdefault"), I get a file not found exception.
The file's only unusual attribute is "A" (archive?). My code, shown below, gets the exception at this line, when I try to open it:
logFileStream = New FileStream("C:Windowssystem32configdefault", FileMode.Open,
[code].....
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Nov 9, 2011
I did ana application that interacts with excel (reading and writing files)But when the application ends and I close it, the excel file is still in the task manager procceses (ctrl+alt+del ->Proccesses)How can I completely close it?I'm using vb.net 2010 express
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Jun 8, 2010
Hi,in my application i have to read from an excel files and check the value of every cell i'm using an OleDb connection to open it and reading but i have this issue if some of the cells in the excel sheet is having this warning when i try to read it returns DBNull .knowing that i can not force the user for not having this warning ...i have to solve this within my code .
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Mar 4, 2010
I have the following error for every cell: "the number in this cell is formatted as text or preceded by an apostrophe" To duplicate the error: I have to store this results that come from a Web services as strings array: Sample: (3 by 3 array)
[Code]....
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Aug 23, 2011
I'm trying to return a integer / count of the ammount of files in the directory and sub directories in the 'Windows' folder, I need to be able to do this as fast as possible (no lag) and tell when it's done, hope I explained this right.
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Jan 18, 2011
What I am trying to do is I have a .dat file that I cannot read but can at the same time. What I mean is I know how to decipher it by hand (alas takes minutes per 6 parts and there are thousands.) I am trying to make an application that can read this and allow me to edit it from my computer. I can open this with a hex program such as hex editor neo. I am currently trying to get it so I can read the file and have it place corresponding parts in to text boxes that I can alter to suit my needs.
I am new to visual basic and know a tiny bit about C++ if you think I would be better off trying in C# I can try that as well I do know some since learning c++. There are 41 parts to each item listed in the file and each one would need to go in its own text box. In hex there are 348 blocks that need to be arranged in corresponding order. Also the beginning of the file has 6 block followed by a code for each item. I need to find a way to put all the correct code in the correct text box and have it make sense.
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Sep 20, 2010
I'm using vs2010 and can't get this to work. The same code has worked in earlier versions. What has changed?
config file:
<appSettings>
<add key="ConnectionString" value="Data Source=MikeLaptop;Initial Catalog=AdventureWorksDW2008R2;Integrated Security=True"/>
</appSettings>
Code:
Dim strProvider As String = ConfigurationManager.AppSettings("ConnectionString")
strProvider is always = nothing
How to do this now?
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Jan 16, 2012
Is there any way I can get the memory usage for all processes currently running on a machine in vb.net?
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Nov 2, 2010
I am working on a windows service and I am looking for a better solution to an issue with high CPU usage. The service needs to only 'run' every minute or two to gather some db data and do some light processing. Right now I have it running in a separate thread in the service application using the BackgroundWorker. In that thread, I do a Thread.Sleep(30000) after each db iteration. This has taken care of the CPU issue (obvious) but I am let thinking there is a better way. This works fine, I can still cancel the service without issue etc. however it feels wrong. Blocking that thread seems bad.
That being said, what is the best way to actually do this? I don't want the loop to just constantly run, I only want it to do work on a somewhat regular time frame. Would running this in a timer_elapsed event handler be a better way?
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Mar 2, 2010
I'm currently working on my (business) master's thesis... the topic is capital budgeting tools to manage major investments for a European energy supplier.So far the company has used MS Excel for calculating relevant data to make decisions on whether to invest money in new projects or abandon them. There usually is a host of input data, lots of basic calculations and just two or three outputs (such as Net Present Value, Return on Investment etc) .It is my task to develop a new excel template or decide on buying a completely new software license, if excel proves unable to provide the functionality the company needs.
So far I have only very limited programming knowledge, stretching to Java basics, some HTML code and SQL Databases.However, a colleague hinted at the fact that the VB.net programming language can be easily learned and used to improve excel considerably. Ideally I would need excel to be able to:
- make sure people putting data into our template don't mess with it
- be able to communicate with a database
- have an appealing, structured and neat appearance for ease of usage by people with limited IT abilities
- provide all output, including sensitivity analysis charts, in a structured, printable overview
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Oct 23, 2009
The following code works fine but seems to leave instances of excel.exe running in the background. How do I go about closing out this sub properly?
Private Sub ReadExcel(ByVal childform As Fone_Builder_Delux.frmData, ByVal FileName As String)
' In progress
childform.sampleloaded = False
[code]....
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Nov 19, 2009
I have a vb.net program that opens up an excel workbook and runs a macro ("Report") in that workbook when a button is clicked. [code]...
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Sep 9, 2010
I want to reading in a excel file and extract the sCodenumber sDescription ans the sStatus and store them in a array : StatusComposeArray(5200) As MyCompose. After this I need this array for comparing outside this class. But as can you see the array is defined inside the sub: ReadingIn_ExcelFilesCompose [Code]
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Apr 2, 2012
I'm showing an excel file in a WebBrowser control on my form, but it doesn't show any toolbars. The customers wants the ability to make changes in the control and save them, hence the need to show the standard toolbars.
I've tried many different things including:
For Each cb As CommandBar In xlApp.CommandBars
cb.Visible = True
Next
'and
[Code]....
how I can get toolbars to show in the WebBrowser control?
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Jan 25, 2010
Get the current number of usage days, unique usage days, etc in an evaluation license using CryptoLicensing Generator.
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Feb 29, 2012
I'm trying to upgrade an Excel VBA workbook to a VSTO Excel Add-in in VB.NET using VS 2010. In the original (i.e.- VBA) version I have a modeless UserForm (called frmMain) that floats on top and is visible at all times while the user is still within the Excel application, but is not visible if the user moves to another window outside of Excel.
For example, within Excel the user can click on any worksheet tab, select any cell, etc. and the UserForm is still visible. This is exactly how I'd like it. The problem is, that in the new VSTO add-in, I can not get the Windows form to mimic this same behavior. I use frmMain.Show() to show the form as a modeless form, but the moment the user clicks an Excel worksheet (i.e.- activates a worksheet) the form becomes hidden behind the worksheet.
[Code]....
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Oct 7, 2009
I am trying to read excel data (Excel 2007 SP1, on Windows XP SP3) with visual basic .net 2008 (VB 9.0 SP1). I have tried several attempts and whatever I do I am getting the following error message: System.Runtime.InteropServices.COMException was unhandled ErrorCode=-2147319784 Message="Altes Format oder ungültige Typbibliothek. (Exception from HRESULT: 0x80028018 (TYPE_E_INVDATAREAD))" Source="Microsoft.Office.Interop.Excel" Message="Altes Format oder ungültige Typbibliothek." Translated: Old format or unknown type libraryI have added the reference "Microsoft Excel 12.0 Object Library" to my project. I am assuming that I might have to add a different or an additional reference, but I do not have any clue which one to use. List of things I have already done:- Searched other forums- Altered the language settings- Tried it on an other Computer (Win XP SP3, Excel 2007, Visual Basic 2008 Express)- Ran the diagnostics tool in Excel - Updated all updates etc...- Reinstalled Visual BasicI really do not have any clue why it should not work?
Imports excel = Microsoft.Office.Interop.Excel
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim xlsApp As excel.Application
[code]....
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