I'm looking for opinions on the safest/best way to append to a text file.These are my two current methods:)
Try
FileOpen(1, RecordingPath & "Log.txt", OpenMode.Append)
PrintLine(1, strAnalogOutput)
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My.Computer.FileSystem.MoveFile to move logs of a command line application to the directory that I want.The problem I'm having is that, if the file already exists, the program errors out. Which makes since.I could just use conditional logic to replace or rename the file if it exists. The problem with the former is that I need to keep all of the logs and the problem with the latter is that, without knowing how many files could exist, I wouldn't know when to stop renaming files.If I knew that there were only going to be 5 files, then I could work with it. But since there probably won't be a finite amount of files, I need something automatically amend the new log to another name. For example, if I had "Test", then the log would amend the next file Test1 and so on.
View 2 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 RepliesIm creating a program that stores usernames/passwords for different devices which will require a login to get into the program but I need to save the usernames/passwords somewhere. Is there a more secure way to store this than in a text file? Or I could try encryption which could be quite fun.
View 3 Repliesi have been trying to work out how to modify a list box at run time ( i.e add in the detail when some presses a button ).I found some code in a sample program, which I thought I understood, but when a cut and pasted this code into my program, it didn't work as expected.The code which I cut and pasted was
Me.resultsView.Columns.Add("Match", CType(Me.resultsView.Width / 2, Integer))
Me.resultsView.Columns.Add("Position", CType(Me.resultsView.Width / 4, Integer))
Me.resultsView.Columns.Add("Length", CType(Me.resultsView.Width / 4, Integer))
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Obviously the top few line are meant to be column headers. Seem simple enough but they don't work in my program, I get no column headers.
When I run the program and pressed the command button, the only thing that appeared in the listview box was the word "This". When i pressed the command button again there was another instance of the word "This" appearing next to the original. The same thing happened the next time I pressed the command button.
Alright, simple as can be. I am stuck back doing my project again this year in college since i failed.So my question is if anyone can help me with the coding as to how i can restrict a member from the database, Also i wanna know if i am doing it right in terms of code for Amend.Try to explain it nice and simple.Sorry but unfortunately my college has blocked every single image host so i can't show ya all a screenshot but i can show ya the coding i have.
so far i have it laid out so user can input details of a member.I have 4 buttons on the form, one is Add, Amend, Delete and Cancel.I have the coding right for Add, Delete and Cancel.So i have a checkbox where if a member is restricted the change is placed on checkbox.
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Basically I have no idea how to amend a record. I want to amend a record using controls displaying the details. The problem is that i can't find a book that talks about updating a members record. By the way I am using Random Access Files to sore details in
View 14 RepliesI am having difficulty on the below code in understanding what is missing for the program to accomplish the below:Highlighted in red are the codes for Amend and Delete buttons:
1. The amend button was created to amend names, price and qty, with the code below it does amend the RentalRate(price) and intNoof Bike (Qty) however it does not change the Bike Name,
2. Delete Button code is as follows, when this is done i get an error "Index was outside the bounds of the array." at following bold red line
Private Sub lstBikeType_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles lstBikeType.SelectedIndexChanged
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I use this code to get row id from dgv in @id like in the picture.
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Now how can I amend this code to use it to get sevral rows ids in @id like in the picture, so when I highlight these rows 52 and 53 and 45 and 55 I want thier ids shown in @id like this 52;53;54;55; with (;) between them.
I am trying to create a sign in program for my members. They come to the computer, input their birthday (already in the database), and up pops a Form with DataGrid that shows all the members with that birthday. Here is where im getting stuck. I want the user to select their name (row) from the DataGrid, click the button Sign In, and have the database be updated in the "Attendances" column to previous+1.
I first approached using the DataGrid1.SelectedRows.CopyTo method but had no luck. If someone could please help me to read which row the user selected, and then search the database for that persons name (which the row contains), and add 1 to a column in the database.
'Begin Code
DataGrid1.DataSource = Nothing
DataGrid1.Columns.Add("first", "First Name")
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How do i amend my Notepad assignment to support MDI interface multiple concurrent files
View 1 RepliesI want a msgbox with some text, and a Yes and No option..Why wont this code work?
MsgBoxStyle.YesNo ("TEXT")
I really like the coding speed that vb.net provides, but I don't like the possibility to forget to declare variable types, return types of functions, etc. and that is why in each class I use[code]..
Is there a way to define those two options on the project/solution level?
the combo box style 1 has both the drop down option but also a manual entry option. I need to know how to code it so that when you manually enter data, it takes that data and places it in a text message "The shipping charges for "data" is $15" displaying in a text box. Shouldn't be hard but have developed a mind block.
View 4 RepliesI have a combobox and have 10 items in it (Name of countries). I want to make the users life easy so that when they click inside the combobox and start writing then the text box will start predicting the rest of the text in the combo box. i.e. if i start writing "U" then the textbox will start predicting "UK" as "UK" is already a pre-populated item in the combobox.
How can I restrict the user from selecting only values within the pre-populated items of the combobox. Bearing in mind the combobox allows the user to write inside it (for the benefit of predictive text). But lets say there are values of UK, USA then I dont want the combobox to accept the value of "Ukraine" when the user clicks away from the combobox.
if we need to browse a file from a open file option than how to select a file from the open option and only name of the file should be written on the button and by clicking on the button u should be able to open file the file can be .exe, .doc and any type of file
View 1 RepliesWhat are the pros and cons of standardizing on using Option Compare Text vs Option Compare Binary for VB.NET development?
- EDIT -Just some background since it seems like it would help - my development team has found it much easier to standardize on Option Strict On, Option Infer On, and Option Explicit due to their obvious advantages over the alternatives. What we haven't found as easy to standardize on is Option Compare Text/Binary as there seem to be advantages and disadvantages to both and different developers have differing opinions. Some of the arguments for each side have been as follows:
Some of the advantages/arguments for Option Compare Text:
It reduces verbosity in the code by removing the need for StringComparers and .ToLower() calls and StringComparison.OrdinalIgnoreCase all over the place Data needs are rarely concerned with casing, as evidenced by most databases being case-insensitive. Rarely would you ever really want to distinguish between THIS and This and this when doing a data comparison.
Certain specific use cases are simpler when you don't have to worry about casing. For example, handling ASP.NET control events where commands are sent to the codebehind as strings and casing-issues are difficult to track down as the compiler cannot help you. Think Select Case statements for <asp:repeater> events as an example.Many of the concerns raised about text comparison concern internationalization, which is often not that relevant to a lot of applications.VB specifically is case insensitive as a language, though Visual Studio helps you by at least enforcing consistency in your casing. SQL is case insensitive as well. Strings are the only place where you have to remember to worry about it, which highlights the awkwardness in ways you wouldn't normally notice it if you were worried about it everywhere.
Some of the advantages/arguments for Option Compare Binary:C# works this way, as do most other languages. It's somewhat unexpected to have alternate behavior and the unexpected is not good in programming.There is a slight performance penalty with Option Compare Text as evidenced by the IL generated on compile. Option Compare Binary doesn't have that penalty.Option Compare Text only makes certain parts of string handling case insensitive. But, it doesn't make it so that things like dictionary indexing are case insensitive by default. So, it's not like Option Compare Text actually makes it so that you don't have to worry about casing at all. If it only works half way, why bother?Programming is hard. It's best not to attempt to smooth over that fact. Worrying about string casing is part of the deal. Humans recognize THIS is different from This and tHiS. Of course your code should too - after all, they aren't really the exact same string.
i have written a sub routine for a Save>Menu option for a MDI Text Editor, Please see my code below
Private Sub SaveToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles SaveToolStripMenuItem.Click
Dim f As Form2
If f.Text = "Text Editor V.2 - New Document" Then
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I have made my program but I want to give users the option of choosing a custom color for text. I have an inputbox that works and then converts it to Color.whatever. But seeing as the user types in what they want and it is not done by the program itself it can throw exceptions.
Dim directresponse As String
Dim actualcolor As String
Dim isgood As Boolean
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That is my Sub, it will make Color.(userinput) but I need to check if Color.(userinput) is actually a color that VB.NET can understand and add set.
I have tried "System.Drawing.Color" I get told it is a type and cannot be used in this context.use System.ComponentModel.TypeDescriptor to convert it to a color and check if it is real and then set it.
what does these two code means in vb.net: Option Explicit on Option strict on i think option explicit means the compiler is not going to do any kind of conversion and i need to do all of them by the code;also it becomes case sensitive i.e;
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i am just trying to invoke a service through console application file. for that
Process.Start((CurDir() +"" +
"installutil.exe" +
" " + CurDir() +
"" + ("money.exe"))).
Which gives error..?
where "installutil" and "Money" are vb.net exe files. "money" is a windows service file.
2, Or is anyother way to add these exe's as referrence and how to invoke ?
3, or is anyother method to invoke a windows service on single mouse click.?
I'm trying to do is make a program to where when you click an option, a text outputs for each button clicked, the general design looks like this:
That's just a beginning, since the whole rest of the thing will be the same concept pretty much, and what I want to have it do is, like stated earlier, once the option is chosen, a text output, like this:
I know there is an alternative to solving that, but it will take me 10x more time, and that is, creating a new textbox, setting the visibility to False, and typing what I want outputted in that text box, then putting: RichTextBox1 = TextBox1.Text
I know that works, and gives me my output, but I just wanted to know if there was any other way but that.
I want the program exe file should be used as a dos command with options. ex: dir /p
same way myapp.exe /auto. Iam using visual studio 2008,
I want to execute autoit script using vb.net in vs 2010. While executing it keeps prompting. Is it possible to embed a manifest file in a class lib type project in vb.net. As currently I cant see any option to add a manifest. How to disable that prompt to occur while executing a script from code.
View 1 Repliescan anyone tell me if this option is available in VB.NET 05/08, I want to add Win32 resource file (.res) to project but i can't find any option to do that, and the option was in C#. This not a regular resource, it was created using native resources template. Below are the screenshots of Application tab in project property from C# and VB IDE. The option that im looking for is in red box on C# screenshot
View 5 RepliesI was created ".cta" file for my project that file was loaded into my Richtextbox control so I created File associations option into registry all was done but I just double click that file in explorer, my application will run but that file was not loaded into my Richtextbox control. How can I do that...
View 4 RepliesI have a very simple app (at the moment) that stores file names/paths and folder names/paths in an SQL database and displays them in a ListView and TreeView respectively. All fine and dandy.I have an option to remove a file or folder from the appropriate database table and then recreate the associated list.[code]I've checked and double checked the folder table adapter (even to the point of recreating it c/w Insert, Update and Delete commands) to no avail.
View 1 RepliesI am trying to create a wpf program that allows the user to create custom shapes or pick premade shapes and that after making their selection, a canvas shows their shapes randomly sized, positioned, colored and copied in multiples. I am hoping that on click, the program will put its output on a time interval and that the user can click stop when they are satisfied with how everything looks. My issue is, I would like to also give the user an option to save their created artwork as a jpeg file. Also if I wanted to link this file to a web browser what will I have to do?
View 1 RepliesI want my console application to be able to do one function I have when you click one option on the windows context menu, and another function when you click another option.
View 3 RepliesHow can I get round this error: Option Strict On disallows implicit conversions from
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