I am trying to decrypt a file and the decrypted contents will be loaded to a listbox.
Public Sub Decrypt(ByVal inName As String, ByVal outName As String)
Try
Dim array As Byte() = New Byte(&H1001 - 1) {}
Dim num2 As Long = 8
Dim stream2 As New FileStream(inName, FileMode.Open, FileAccess.Read)
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1. How do I make it so a listbox displays a files contents once loaded?
2. How do I save a textboxs text?
3. what does this error mean?
An error occurred creating the form. See Exception.InnerException for details. The error is: Failed to initialize because CategoryName is missing.
I'm in the process of adapting a current program that I've created to automate it. **Current State***User selects an excel file and the contents are loaded into a DataGrid User can select which environment to run their query against (stage/prod) Program completes processing and updates datagrid with new values User can export datagrid to excel What I'd like to do is centralize the program on one computer and have it monitor a network folder for creation of a specific file type (*.xls or *.xlsx). If one of these is created in that folder then I want to add that file to a queue for processing. Once done processing I want to send the results as an attachment to an email to the user that created the file. After a file is processed I would like to remove it from that folder as well (into a diff folder of completed items).
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ive been trying to use System.Security.Cryptography to encrypt and decrypt a file but its not working for me
this code
Private Sub EncryptFile(ByVal sInputFilename As String, ByVal sOutputFilename As String, ByVal sKey As String)
Dim fsInput As New FileStream(sInputFilename, FileMode.Open, FileAccess.Read)
Dim fsEncrypted As New FileStream(sOutputFilename, FileMode.Create, FileAccess.Write)
Dim DES As New DESCryptoServiceProvider()
[code]....
called with
DecryptFile(OpenFileDialog1.FileName, SaveFileDialog1.FileName, "12345678")[/CODE]
outputs a file that is almost 2x as large as the source file that was encrypted.
I need some help sending the contents of a listbox to an output text file. Is there any code is visual basic that will allow me to do this.
View 13 Repliesthe project i am currently working on has a form in it that has quite a few objects that take a couple of seconds to load. Because of that, if i simply use the .show command, the form shows up, but there are a bunch of blank white boxes where the content is still loading, how can i have the form not become visible until ALL of the contents and images inside are fully loaded?
View 1 Replieswhat i am trying todo is get a listbox to display the contents of an XML file. The problem is at the start of the code when i try to load the xml file.
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Using Visual Studio 2008
I have a Listbox where i use OFD to list selected text filenames, can be multiple and from different drives
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I would like to be able to select more than one and have the whole of the lines loaded. I have tried many approaches, 'For each line' for example, but cant get my head around it. Another issue is that i would only like to see the textfile name in the listview box instead of path and filename.
Imports System
Imports System.Data
Imports System.Data.SqlClient
Imports System.Text
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I can't get the original decrypted password.
I have a wpf application that stores videos/images and generic files
1) what is the best way to encrypt these type of file in term of performances
2) and when you encrypt a video how do you load the decrypted one on a mediaplayer?
1. I get a list of excel files from a dir into a list box and search for number by select each files at once. I want to select multiple files at once and search them one by one.May be using checklistbox.
2. The output is shown in a new window (labels) with result from that particular file. If multiple files are selected that the output should show result from all files in different labels.
3. Excel program stays open in memory after closing my application.
4. Also I cant get the app to display message "maskedtextbox1.text" not found in the sheet.[code]
I get a list of excel files from a dir into a list box and search for a string/number by selecting each files at once. I want to select multiple files at once and search them one by one.May be using checklistbox.
2. The output is shown in a new window (in labels) with result from that particular file. If multiple files are selected than the output should show result from all files in different labels.
3. Excel program stays open in memory after closing my application.
4. Also I cant get the app to display message "maskedtextbox1.text" not found in the sheet. If I do after line 30 Else messagebox.show "String not found", it goes into loop or displays the message even if the string exists in the excel file.
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how can i import email from listbox to loaded url in web browser component?i have an url there www.mylink.com and when it loads it has a textbox and continue button. how to import email from listbox to that textbox and the application after inserting to click to continue button on loaded web url..
View 2 RepliesI'm having trouble writing the code to encrypt a file->networkstream->Decrypt the file.. I've tried several ways, but I keep failing....
View 1 RepliesI would like to know if it is possible to be able to encrypt a file and have my application be able to decrypt it and ammed the file as necessary. and then when the program exits it will encrypt the file back up.
View 4 Repliesi am trying to decrypt a file that was encrypted with Des. However not all of the file is encrypted just a few lines are. Here is an example of the file im trying to decrypt:
Random text
Encrypted Text
MD5 Hash
Encryption Key(Only there for tests)
Number of encrypted lines
The idea is to read the last three lines into variables and use them to decrypt the text. At the moment i use the number of lines - (the number of encrypted lines + 3) to find where the encrypted text starts. Then i was trying to copy the encrypted text to a temp file so i could run the code bellow on it, however i am getting an encoding error apparently i need to be using base64 or something. So my question is can anybody explain to me or show me how i can pull the encrypted text out of the file so that i can use the code bellow on it.
Dim DES As New DESCryptoServiceProvider()
'A 64-bit key and an IV are required for this provider.
'Set the secret key for the DES algorithm.
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I need some help on saving/reading xml from/to dataset. I would like to make that complete file is encrypted and not only some elements inside or part of file.Currently this is not working in any way at all.[code]
View 14 RepliesI ended up getting this properly working, as far as encrypting a file goes:How to encrypt and decrypt a file by using Visual Basic .NET or Visual Basic 2005 However, the catch is I have to change the name of the output file. What I was hoping to do is overwrite the original with the encrypted file, but when I tried that on a large file, it ended up only getting about 8 bytes of it.
Does anybody have any suggestions or recommendations? The overall idea is that I want to keep a file encrypted until it needs to be unencrypted for use by a program, but I'm not sure if there are better tools out there or if there's a better way of accomplishing this.
Question 2: I would really, really like to encrypt an entire folder, which I'm guessing would be faster than file by file, but when I try I keep getting access denied errors, even with DOS Cipher. Is there a way to do this with a key?
I give a file as parameter it crypts it with anything I don't really care if its safe or not I just want to person to not understand anything if he try's to read the file directly.so something like
[code]...
I want it to open the file, rechange it to the uncrypted value then close the file. I'm using serialization so it has to be able to crypt and decrypt anything serialization does.
Reason:
When I open the file the file serialized I can still see some text.I can still see some text. =]
Has anyone used these methods? I tried File.Encrypt on a text file, and I did not get an exception, however the Encrypt method did not work (the file was unchanged afterwards).
View 3 RepliesI 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.
The user enters information into a textbox, and if it is present in the litsbox an error message will be displayed, if it is not already in the listbox then it will be added to it.
I save what the user enters as a variable and i am wondering if its possible to check the exact contents of a listbox?
So suppose there is a string: StringRamdom and you display it's contents in a listbox.
so listbox.Items. Add(StringRandom) but it should be displayed as A, B, C
not
A
B
C
Is it possible to save listbox contents, on form_closing event, and reload them on the form_load event? If so, could you please show me how?
View 2 RepliesSo, I have a little GUI setup with a Listbox and a Richtextbox.I want the Listbox to display all of the .txt files displayed within a folder I have defined, then when a ListBox item is selexted, it displays the contents of that file within the RTB
View 5 RepliesHow to print all the items in a ListBox (as detailed as possible). I read the other responses but I couldn't understand the code so well.[ocde]...
View 4 RepliesI want to save the listbox contents in to xyz.txt .How can i do this in VB? I want it to save automaticaly into C:xyz.txt .
View 1 Replieshow to send all the contents of a ListBox to a MsgBox
View 7 RepliesBeen trying to figure out how to do this for a while, but I can't seem to find anything that exactly covers what I'm trying to do. I'm really a novice when it comes to vb .net, so this might be staring me in the face and I wouldn't know it.I've got a Motorola MC3090 mobile barcode scanner running Windows CE 5.0 at work. I wrote a small program (in .net 3.5) that allows me to scan barcodes and then get counts for specific barcodes when I type all or part of the barcode into an textbox. That works pretty well for receiving, but I need something that works better for the reverse process (shipping things out).
I have an textbox which accepts the barcodes. When the scanner emulates an enter key press, it adds the code to a listbox and clears the input field. This process loops as many times as my quantity field specifies. There's another textbox which I use to input partial barcodes that I want counts for. It looks for strings in the listbox that match, dumps them into a second hidden listbox, and counts those.
If you're the tl;dr type, here's the short of what I want to do with all of the above. I want to take the contents of the visible listbox, summarize by listing each unique barcode, and have a count of how many of each unique barcode appears in the listbox.
How can I decrypt a file encrypted in vb.net? Is there a possibility here?
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