Ok heres my idea Start(button)> start timer1 countdown> keypress> start timer2 countdown> keypress2> if keypress2 happend twice> then keypress3> loop> end>I understand the science behind it but I fail to grasp the knowhow of the program lang if anyone knows how this could be done in VB Express.
View 9 Replies
I just know it works. So as a personal project I'm trying to learn in VB/C# all about Cryptographic methods and how to use those techniques to encrypt and decrypt files. [code]
View 2 RepliesFrom what I understand, it is still impossible to prevent software piracy until a global Internet is established.
In the meantime, I'm looking for suggestions on how to protect any new projects I design.
Basically, my program will try to generate the list of all possible lowercase 5-letter words. Including all combinations that clearly are not real words like jshcc or mmdzq.
I do that by stacking up a massive amount of calls for a function, which does the word work.
But that's simply too much, and I get a stack overflow error.
Does .NET have built-in techniques for more complicated forms of iteration like the following:
1. Iterate over rearrangements of a list.
2. Iterate over subsets of a list.
3. Iterate over all indexes of a multidimensional list.
4. Iterate over all "combinations" of a list, i.e. all subsets of a list of a given length, where subsets that differs only in their ordering occur only once total.
I recently had cause to do (1) and my method was ugly, slow, tedious, and generalized poorly, which is why I ask. I can think of better ways, but it was garbage code anyway [brute force checking that there are precisely 576 seven-digit numbers made up of 1, 2, 3, 4, 5, 6, and 7 that are also divisible by 11]. The others are just for my own curiosity.
While I've mainly been developing small applications for personal use, I stumbled upon making a touchscreen application for a close friend. While he is not very good at programming, he is pretty well at drawing/etc... So, I thought about expanding my horizons some.I already have code that loads images from a folder, and made that folder changeable via the program, so in effect, probably a horribly coded way of skinning some parts of the program (the buttons). But then I though about it some more and really wanted to learn a better way to make my programs 'expandable'.I have begun searching about how to make a program that can be used with plugins, how to make plugins, and so on... I am researching about dynamically changing controls and other things, so that when resolutions change, I don't have to code each individual buttons new size/location, and, most importantly, a way to implement patching/app upgrades...
View 2 RepliesI have adopted a technique where I pass existing objects to forms so that they can display the object's content and allow the user to alter it if necessary. The form is not bound to the object, so when it comes time to act, the form sweeps up the content of its controls and puts them into the object. The object is then validated and any issues reported to the user. If the object is valid, it may be handed back to the caller so the caller can refresh a view/list/etc.
So far, so good. However, if the form's content, or lack of, creates an invalid object and the user does not correct it, maybe cancelling the form, there's a chance the form will hand an invalid object back to the caller. This is not good.
Essentially I'm looking for an elegant and efficient way of either leaving the object as it was or rolling back if the user cancels the form/action.
I have considered a range of techniques, each with many pros and cons. I'm keen to consider some other views.
I have the following "contact" data (exampled below) stored in an xml file.I've created a frmContacts windows form and placed a list box control inside it.I'm new to the list box but plan to have the users manage the list by letting them add, delete, and pick from it. For searching there should also be a sort function/button (by last name then first name).If the user deletes from the list the corresponding data in the file will be deleted.If the user picks from or adds to the list, I'd like to find the best way to populate the corresponding data elements on another form (i.e., in their respective text boxes). This will include the ability to edit/save from this other form too.
<?xml version="1.0" encoding="utf-8"?>
<Rows>
<Row>[code]......
Say we have a DataGridView on the main form. I can chose to establish its properties by code or by selecting them in the Properties panel. Is there a difference between these two techniques, a loading time penalty in any of the cases especially?
View 5 RepliesI am using an httpWebRequest in my windows app to download files from a webserver (sURL), to a local folder (fileDestination) as such:
Public Function DownloadFile(ByVal sURL As String, _
ByVal fileDestination As String, _
ByVal WebRequestType As String) As Boolean
Dim URLReq As HttpWebRequest
Dim URLRes As HttpWebResponse
[Code] .....
This works fine for the first few files. But then it starts giving the error:
"operation has timed out"
on the URLReq.GetResponse line.
I have a piece of hardware that is controlled via USB.There are 8 LEDs on the output byte. One LED per bit.I like to toggle the outputs based on selection of checkboxes and given frequency entered in TextBox.I inserted 8 checkboxes to allow me to select the desired LEDs to be on.I select the checkboxes to select the required LEDs.The checkbox gives me the byte value. XORing the byte value with 255I can see them toggling very fast. I have a while loop to blink forever until I click on stop button.The stop makes the seq=false and this should stop the blinking but it keeps going.How can I insert desired delay of flashing frequency in my output routine?How can I stop on demand to change pattern without exiting the program.
View 2 Repliesi need to download a file from a webserver on a regular basis ( every 5 minutes ), the url is something like url...
View 1 RepliesPrivate Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim req As HttpWebRequest
[code]....
I run a program with 20 threads getting data from web.
After about 10 minutes I keep getting operation timed out exception.
If I restart the program it works again for 10 minutes.
Looks like there is a memory leak or something.
Some says that webclient uses webrequest object somewhere. I do not see it in watch though.
I am trying to add functionality to automatically click the receive button if the Form1 is loaded.Even when i did not attach it to the timer the bCheckmail.PerformClick() did not work - Ideally this application will be loaded and check mail every 15 min.
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim Code As Integer
Dim Version As Integer
[code]....
I'm trying to make a simple program that keeps track of a list of phone directories. It offers the option of adding new names to the directory and deleting names already stored.I want the program to display a small unobtrusive message when a name is added or removed.For example, a label that shows "James Potter added to directory..."and then disappears after a few secondsGoing through th file mentions the timer but it seems like an awfully long winded way involving a new control and a new subroutine for every single timed event. I was wondering if there's an easier way, perhaps a single command like:
View 16 Repliesi have a datagridview and each row got link.. and i using timer and backgroundworker as downloading file.. the 1st file download, its perfect working.. but when its going to download 2nd link from datagridview, nothing happened.. even its said, "The operation has timed out"..
[Code]...
im trying to make a short term ordering system for my major work for year 12 , i need to know how to run a timer in a label and progressbar at the same time , run by selections by combo boxes in another form.
View 7 RepliesI am working on a program to turn on devices at times of day and days of week. I am designing it for 15 devices and each device has a file. The problem I have is monitoring all 15 files. I can monitor each one and it works for that device, but only the device file I have called. I used data binding to create the files and can display the files one at a time, but I need to monitor the info on all 15 files actively.
View 3 RepliesI am trying to use a timer and stopwatches to control timed events and it's not working. This should be easy to implement and I don't understand why it's not working.
Code:
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
'hide label1 after 3 seconds.
[Code].....
When I push in my program button which read data from serial port, then when are here not data, it write this error which stop program:The operation has timed out.When I push in my program button to read data from serial port and when the data exists there, then is all OK...Please what can I do for eliminating this message = when are not data in serial port, then I want become NO DATA and when exists data in serial port then I write this data....Here is shorted program:
Private Sub program_Load(ByVal eventSender As System.Object, ByVal eventArgs As System.EventArgs) Handles MyBase.Load
Port1.PortName = "COM1"
[code].....
When I push in my program button which read data from serial port, then when are here not data, it write this error which stop program:The operation has timed out.When I push in my program button to read data from serial port and when the data exists there, then is all OK...what can I do for eliminating this message = when are not data in serial port, then I want become NO DATA and when exists data in serial port then I write this data....
Private Sub program_Load(ByVal eventSender As System.Object, ByVal eventArgs As System.EventArgs) Handles MyBase.Load
Port1.PortName = "COM1"
Port1.BaudRate = 9600
Port1.DataBits = 8
[code].....
I have built a Windows Service and this runs great but what I would like to do is have this service check a website every 5 mins and ensure that a status code of 200 (Success) is returned.
checking aspect and the timing side of it.
I have a timed event that displays a balloon in the system tray. I would like this icon to remain active for 2 minutes or when the user closes it. When this time expires, the balloon should close and begin a function. I am having 2 problems with this:
1) The baloon icon is limited to between 10 and 30 seconds, when the user is active, so it closes to soon.
2) when the user is not active, the inactive time does not count agenst the timer.
I have some software that grabs information from a mysql server. However, users minimize it to the system tray, and leave it idle for hours until using it again.If a user leaves the program idling for about 15 minutes, then goes into the program again to perform a query, it throws a Fatal Error in the mysql, and says 'connection must be valid and open'
The reason is simply because the mysql connection has timed out..I was wondering what the code would be to re-connect to the server IF it has timed out.
"The operation is timed out " in use with timer and reading serial buffer.I read every 50msec (timer) serial buffer and when are not data in serial buffer, then VB2008 write "The operation is timed out" and program stopped.When are data in serial buffer, then is all OK.PLEASE what can I do, when I want NOT stop program, when are not data in serial buffer.I use this code in timer:
[Code]...
I'm currently debugging a form that sets a flag when the mouse button is pressed, then clears the flag when the mouse button is released. As long as the mouse button is pressed, the user can move the mouse around and a few things happen depending on where they move. One of the things that happens is that a timer starts, or stops, and a few things change color depending on the mouse position. The timer starts when it should, then stops when it should, but once stopped, it is not re-starting when it should. I can verify that MouseMove events are getting through, because coloring changes as I move the mouse, as it should. This would be a simple thing to debug...except that it requires the darn mouse button to be down, and it uses the mouse move event. Anybody who has put a breakpoint in a mouse move event handler knows the issue: There are THOUSANDS of them. Worse yet, since the mouse button is necessary for switching to the IDE, as well as setting a breakpoint (technically, a keyboard shortcut could do this if I could shift focus), I can't wait for the problem to happen, then switch to the IDE and set a breakpoint to see what is happening then.Does anybody have any tips or techniques for debugging in mouse move events when the mouse button is down and has to stay that way? As it is, I'm going to have to write some funky code into the method just so that I have a place to get a breakpoint when I need it without breaking on every one of the mouse move events.
View 7 RepliesI have a program that runs a pretty long operation in the background once a user clicks the button. I have implemented a progress bar but if the window is touched or moved then it grays out and says (Not repsonding). Everything still works and when the operation finishes the program resumes function. (But a user would not know this
View 3 RepliesHow can I create a simple application to send timed controls to an external device?
What I need is to create a very simple application that sends control signals or voltages out to an external device connected via serial perhaps. The external device will in turn trigger some electromechanical devices. There needs to be 24 independent controls each with a simple command equivalent to on or off. What is important is being able to control the timings of the on and off on each control.[code]....
So I have a relatively small website with growing amounts of data - the fastest growing table is pageviews, as we do all our analytics ourselves. The website is made using VB.Net, SQL Server 2008 and jQuery. I am limited to .net 2.5.I currently handle all the data and validation using objects with a list of attributes. Each attribute is of a specific datatype and has a validation function when a new value is given to it. If the data does not validate then it won't even get as far as updating the database and feeds back an error to the user. Currently I have "Manager" classes and "Item" classes - Items are managed by a particular Manager class, for example Users are managed by the UserManager, so to get all the users I just have to call UserManager.Items. These Manager classes are stored in the cache and are created as needed - but once a Manager class is referenced it creates all of the Items within it. This is getting rather slow now, as the company is growing fast. It takes 2 - 3 seconds to load the first page (the page which makes most first-time requests to data) but I am not happy with this time. After that it is nearly instant.
Now the way I see it I have 3 options to speed the website up: Keep it as it is, but try to make it more efficient through other techniques;Change to creating all these objects on every page load, in the hope that it is simply so slow because I am using the cache to store a fair amount of data (about 10 MB or so at least);Forgetting using object oriented techniques and just use straight SQL queries and loop through records.