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.
View 3 Repliesi am not getting the integer values in dataset while reading from an excel files the field which is integer will be showing as NULL.
View 1 RepliesI 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
I am developing a vb.net app that should read cell values from excel. However, it is not returning any results and I thought that it would be really simple. I have imported all the references viz. Microsoft Excel 12.0 Object Library.
Following is the function in my class file which should read the excel file
Dim mobjApp As Excel.Application
Dim mobjWB As Excel.Workbook
Dim mobjSheet As Excel.Worksheet
[Code].....
I have a problem reading a file with hex values.
The values have this format: (2C 0A 0B 45 32 38)
I�ve tried two different ways to open the file. The first one, is storing in a variable of type string,
Dim srTrad As New System.IO.StreamReader(fichToOpen, System.Text.Encoding.ASCII, True)
sLine = srTrad.ReadLine()
so what I get is �2C0A0B453238�. Then I try to put them in pairs and reading as a HEX value, but I can�t. The only thing I get is the hex value of �2�, �C�, and so on. This is not what I�m looking for.
The second way is storing the values in a variable of type Byte:
Dim srByte As New IO.FileStream(fichToOpen, FileMode.Open, FileAccess.Read)
Dim br As New IO.BinaryReader(srByte)
Dim data As Byte() = br.ReadBytes(CInt(numBytes))
The result here, is pretty the same as before. For the pair �0A� what I get is either (30,41) or (48,65) (hex values or Dec). What I need isn�t to convert a char to its Hex value (I saw several examples for this on this forum). What I need is to know that 0A means 10 (0A is a hex value itself)
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)?
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
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.
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.
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].....
I am attempting to read a series of double prcision float values (x,y,z coordinates) from a binary file using the binary reader. Everything works fine except that when I read the number back it is different then the number that was written there (original file is generated by mining application).
written number : 78897.6476586
file contents hex : 40 F3 43 1A 5C CF 43 A4 this converts back to the same number as written using a IEE 754 conversion program. VB returned value : -5.45100266729248E-134 using .readDouble()
I have tried to step thru the file in one byte steps to make sure that I have the proper start position but that did not help any.
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.
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).
View 6 Repliesim 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.
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]....
I've a got a homework assignment that chooses one of four values in a list box, stores it in a text file. Secondly, on the display click event it should access the text file, read the line, store it in a variable and then display the totals in a text box. Works sort of fine except that it doesn't display the totals correctly. Code for both buttons is below. The variable are assigned in the mainform (Tried also in the display button and didn't change anything). The save button works fine and stores fine in the text file, it's just the reading that's the problem.
Private Sub saveButton_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles saveButton.Click
'save the new vote choices to a file
Dim votes As IO.StreamWriter
votes = IO.File.AppendText("votes.txt")
Dim voteSelected As String = CStr(commercialListBox.SelectedIndex)
[Code] .....
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
View 2 RepliesHi,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 .
View 5 RepliesI have a form with a couple of combo boxes. The first combobox adds items based on each row in an excel sheet.
Public Sub FetchExcelValues(ByVal ControlType As String, ByVal control As Object, ByVal xlApp As Object, ByVal xlWorkBook As Object, ByVal xlWorkSheet As Object, ByVal column As String, ByVal row As Integer)
[Code]....
This basically reads each cell in the specified column until it hits a blank cell. Then it takes the value of each cell and adds it as items to the first combo box. Now, what I want the code to do next is to take the selected item from this combo box and look for a match in another worksheet. When it finds a cell that matches, it should pick up the value from column B of the same row as the match. There might be more than one match as well, so every time it finds a match, I want to pick up the value of Column B of the same row and add THAT as items in the second combobox.
I am trying to read data with a test routine from a fairly simple 3rd party Excel file. The file has three sheets and was created by Open Office 3.x as an 'Excel 97/2000/XP .xls' file. The later, still to be programmed, application must later run on machines with Windows XP Professional using the 2.0 .net framework and no Office package installed. The content of the file does not need to be modified by the later application. For some reason, numeric values are not read correctly. They "convert" to DBNull. I've searched around a bit but not found a 'simple' solution for solving this problem. Adding 'IMEX=1' or 'HDR=Yes;IMEX=1' to the connection string results in an error 'Installierbares ISAM nicht gefunden' (installable ISAM not found).
Based on various examples I've found, I've written the following test code:
Option Strict On
Option Explicit On
Imports System.Data
Imports System.Data.OleDb
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[Code] .....
I'm using VB.Net's Excel component to read Excel file, but the performance is totally slow, since it has to loop through cells to get values. Reading a file containing one sheet with 1162 rows and 105 columns (which is small size compared to my general requirement) already costs more than 5 minutes.1. I want to ask if any of you have suggestion on reading such an Excel file with better performance, except OleDB, cuz most compies here have vesion problem?2. Is it normal that it tooks a long time for Excel component to read Excel file, or is it that I implement the code in a wrong way?
View 7 RepliesI have a dictionary object (let's call it _do) I am using to cache some values for use in a multi-threaded program. I have a single controlling parent thread, with a timer function _doTimer() which can kick off child threads with a new instance of class MyThreadObject in each. My parent thread has _do as a property and with each time _doTimer() gets called, it may or may not repopulate _do depending on cacheflag settings. I pass a reference to _do to each instance of MyThreadObject and those threads at some point read the values of _do but DO NOT write to it.
What I want is to ensure that the child threads do not try and read _do whilst the parent thread is writing to it. Same thing but very slightly different -> I also don't want the parent thread to write to _do whilst the child threads are reading from it. However there is no problem with 1 child thread reading the values of _do at the same time as another child thread is reading the values - so ideally I do not want each child thread to completely lock out read access, only locking out Write access.. The code is roughly like this:
[Code]....
When I look at a file on my hard disk, e.g. test.csv, when I look at the Properties of the file, it is officially known as, "Microsoft Office Excel Comma Separated Values File", and file types of .pdf are listed as "Adobe Acrobat Document", etc. etc. All of this information can be seen in Windows Explorer too when my folders are displayed by Details. How do you get at this "type of file" information with .NET?
View 2 RepliesThe 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]....
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]
View 2 RepliesI am creating a maths programs that draws graphs for the user. so far i have placed 22 values into an array and now i need to import them to excel, draw the graph and import the graph back into the program to display them.[code]...
View 4 RepliesHow would i go about reading a file Line by Line that within that line The values are delimited by " Example of the data:
"bob" "cat" "1243"
"steve" dog" "6789"
I've started this with this code but not sure how to go about the next stage:
Using MyReader As New _
Microsoft.VisualBasic.FileIO.TextFieldParser(My.Application.Info.DirectoryPath & "Records28112011.jd")
MyReader.TextFieldType = FileIO.FieldType.Delimited
[code]....
I am trying to build an app that can search column A in an excel document (with textbox control). In column B, I have info about the column A items. When a column A item is searched, I would like a textbox (or similar) to display info about it from column B.
I have never done any Excel related programming, so I don't know what to do, or where to start.
i have this code that i am using to read from an excel spreadsheet but it i giving me an error saying that i am not not giving the exact name of the table.i have uploaded the excel spreadsheet as well. [code]
View 5 RepliesI have a .csv file (created by external program). In my vb.net application I want to read the last cell value. External program updates the last cell value every 3 sec.For this I use the below code. But cpu usage increases (because timer event opens&closes new excel sheet every second)I was successfully doing this with vb6 without any problem, but with vb.net I'm stuck.
[Code]...