Working in VB in VS 2008 I'm trying to read from an Excel file using Oledb. I have no problem with it when the file is not encrypted, but the client has set a password on the working copy.
I read elsewhere that it's not possible to read an encrypted Excel file this way, but I find that hard to believe.
I am using streamreader to read a file that is encrypted using PGP netshare. The file opens fine on my PC and i can read the file using Streamreader when it is unencrypted, but when i add it to an encrypted folder, I get back gibberish when the file is read. Below is a snipit of code, but i feel as though this may not be the problem.
[Code]...
I am uploading an excel file to my app and want to read it. Do I need to have excel loaded to read this?I am getting an error of Object reference not set to an instance of an object.
Public Function GetExcelData(ByVal ExcelFilePath As String) As DataTable
Try
Dim OledbConnectionString As String = String.Empty
[code]....
I tried to read excel file using the method i found here [URL] But i get an error on ADODB.Connection saying "Type 'ADODB.Connection' is not defined" in the following code:
Code:
Private Function GetExcelConnection(ByVal Path As String, _
Optional ByVal Headers As Boolean = True) As Connection
Dim strConn As String
[Code]....
Its was used in VB6... do i need to do something special in Visual Studio 2010?
I'm working on a way to authenticate users in my app, and what I've come up with is the following method.To write to a database, the user must have an account in SQL server 2008. However, I still want people to be able to view the application if they don't have access, but only read, they can't sync any changes. This is working well, as I have a string array hard coded containing approved users:
Dim Users() As String = {"BWANG", "EDASALLA", "ERICHARDSON", "HALONZO", "JCHAPMAN", "SKIM", "PMACK"}
The one problem with hardcoding is that if I need to ever add a user later on, I'd have to release an update to the program. (which isn't hard as I already have updating built into the app, and users can still download updates even if they can't sync.)
What I'd like to do, is use an encrypted .dat file that contains the user names, and store that with the application, so that i could always be added to, and only one file would need to be downloaded.
I have code in place to encrpt and decrypt the .dat file (called users.dat) and this code works for single text entries in the file. I need to figure out how to load a list however into the array in place.
Imports System
Imports System.IO
Dim userfile as String = "C:users.dat"
Dim Users() As String = Data.Decrypt(File.ReadAllLines(path))
Basically each line in the file will have an encrypted user name, and i want it to decrypt each line and store it back into that authorized user list.
I am wondering if it is possible to read in the encrypted value of a Windows users password so I can preload a textbox with the value? I have a checkbox on my .NET form -> Use Workstation Logon. When the user checks this box, the username and password fields are populated respectively.
View 3 RepliesI am attempting to find some code to use in VB.NET to decrypt a string that has been encrypted using the Java crypto libary.All of the code I have found so far uses an Initialisation Vector and Key to decrypt but the string has been encrypted using the Key only. (Using an Initialisation Vector is apperently an optional step in Java).Does anyone know of code that I can use (preferably in VB.NET but i could convert C#) to decrypt AES 128 Bit encoded string without an Initialisation Vector?
View 1 RepliesI have excel 2007 installed on my laptop. I have vb.net 2010. I have tried a dozen different pieces of same code and I cannot read from an excel file...
Imports Microsoft.Office.Interop.Excel
Public Class Form1
Private Sub Form1_Load( _
ByVal sender As System.Object, _
ByVal e As System.EventArgs) _
Handles MyBase.Load
[Code] .....
Warning1Namespace or type specified in the Imports 'Microsoft.Office.Interop.Excel' doesn't contain any public member or cannot be found. Make sure the namespace or the type is defined and contains at least one public member. Make sure the imported element name doesn't use any aliases.C:UsersksimonsAppDataLocalTemporary ProjectsWindowsApplication3Form1.vb19WindowsApplication3
I am trying to read from an excel file. so far this is what i have:
Public Class testclass
Private wrkbk As Excel.Workbook
Private sht As Excel.Sheets
[code]....
The debugger gets to the "sht = wrkbk.worksheets(1)" line then says its has error: Member not found. (Exception from HRESULT: 0x80020003 (DISP_E_MEMBERNOTFOUND))
I have a program that I wrote that uses a system generated excel file from a remote system.
[Code]...
The issue I'm having is when I query the system generated excel file, it is not returning the last row. If I open the file in Excel and then save it, It returns all the rows. Since Windows 2008 64bit does not allow control via Excel to the file, I have to query the file via Jet provider or Odbc provider. I have tried using the Jet provider and the odbc provider.How do I get all the return all the rows with the system generation file?
I need to write VB program to open and read text file, store each field (separated by comma) into an array. In the first array, it's an excel file and I need to execute it, and once opened in excel, there is a macro program inside and i need also to exceute using VB.
sample content of textfile:
C:principalsinventory.xls, MacroInventoryReport, 1, 3:00AM
----------
C:principalsinventory.xls, MacroNearExpiringReport, 1, 4:00AM
I have an excel file which is auto generated by third party software..and its readonly file and its data constantly keep changing online. Now I want to use or read that data in my vb.net application whenever its changes take place in excel file automatically.
View 1 RepliesThe first thing to do is to browse the excel file in my vb.net program then read the content of excel file and display the value of excel content in listview.
View 2 RepliesI have always used Excel.interop before but I thought oledb would be simpler because, for this application, I only have to read the data which it can't seem to do. It accesses the file alright because I can't open the file while I am at a breakpoint. It attempts to read the file because oExcelReader.fieldcount = 14 which is correct. oExcelReader.hasrows = true which is not correct. The line where I use getstring(1) errors out and says there is no data for this row/column.
[Code]...
I need to read a .txt file and then put that into fields in an excel spreadsheet. for example i get print spool files that have invoices on them i need to put the customer names into a column of customer names and their addresses into a column of addresses. here is what i wrote to read with:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim reader As New System.IO.StreamReader(TextBox1.Text)
[Code]....
I'm creating a program and it is paramount to its functionality that it can open->read->close a Microsoft Excel (.xlsx) file.Now, I've searched the forums with the keyword "Excel" and found a lot of stuff in many programming languages, none of which were any use to me.
I should pinpoint that I'm not that good at programming as university takes all my times, but every summer (like this one) i really enjoy tackling my problems via programming.[code]...
I want to read an excel file using VB.NET program. I know the logic below can do this. But I have a question. What if I don't know the name of the worksheet OR if the name of the worksheet is not SHEET1?
[Code]...
I want to rewad values from an Excel file that is always open and updating. I was using standard code to open up Excel and read from it, which worked fine, but that opens a new instance of the sheet. I need to read from a sheet that's already open.
I'm using xlWorkBook = xlApp.Workbooks.Open("c:\example.xls") which opens a new instanc of example.xls.
If example.xls is already open, is there a way of reading from it?
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 am trying to import and read data in from an Excel file that is being updated every half second by way of a DDE Link from RSLinx Gateway,which I think is a default setting, though that data only changes every few minutes. There are 5 rows and 8 columns of data that I am reading in.Each column is a different tester starting with the second row, Testers 1 through 7. The first column has titles that describe the data coming in from the DDE links.
Each column has 5 rows of data related to the tester.I know how to display the data which I will post my code for below, but as far as reading the data and determining whether or not the part was good or bad, based on a boolean value, I am stuck.I would also like to save the data into a different excel file after determining the status of the part so that we can look at past data.
Code display:
Imports System.IO
Imports System.Data.OleDb
Imports System.Drawing.Printing
[code]....
I wanna read all cells of all sheets/pages in my excel file and just show the text content of each cell. [code]
1. How can I read cells inside the While?
2. My select command only selects Sheet1, how can I select ALL sheets?
I wanna read all cells of all sheets/pages in my excel file and just show the text content of each cell.I have written my code but have 2 problems:
Dim ExcelConnection As New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:Excel.xls;Extended Properties=Excel 8.0;") ExcelConnection.Open() Dim MyCommands As New OleDbCommand("SELECT * FROM [Sheet1$]", ExcelConnection)
[code]....
1. How can I read cells inside the While?
2. My select command only selects Sheet1, how can I select ALL sheets?
Using OleDbDataReader, how does one determine if the Excel workbook is empty? BTW, OleDbDataReader.HasRows seems to always be True even for a workbook with no data.
View 1 RepliesI have a vb program that reads data from an excel sheet and displays it in a datagridview. The problem with this program is that it is able to read the data and display it only when the excel file is opened but when the excel file is not opened, it gives an error report that[code]...
View 1 RepliesI need to read information from excel and them put them into a text file,I have the part for text file done and write to it but I dont know how to go and read from an excel file where every row is a diferent record, so I need to read the entire row and put every cell on variables so I can get my fixed text file done.
View 1 RepliesError Opening Excel File Read Only ODBC
View 1 RepliesHow do I open, edit, read excel columns in vb.net? Like, for example, I want to know the values of column B up to the cell that it contains values.
View 1 RepliesI'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 RepliesHow to read an Excel file without using OLEDB connection string?
View 2 Replieshow do i read excel file at VB.net & display the result in a label or something..e.g i know cell A2 is a string of text - e.g Hello this is the P/L for the month i want grab that and put in a label etc.
View 11 Replies