I want to have a one second pause after some code has run. During that pause, if a certain key is pressed, I want to do some action. Otherwise, I want the code to continue as normal. What would I use to replace the comments in the following code?
myTestCode()
' Wait one second and see if a given key was pressed.
' If specific key is pressed, then show messagebox (or whatever) asking user if we should cancel (whatever)
NextMethodToRun()
Yes, I know there are a number of ways, which is why I am looking for something that is fast and simple to use. I do not want a console window, some other form, etc. to appear. Just want to check if a key was pressed. The key (if pressed) should be pulled off the keyboard buffer.
I built a console application with a loop at the end,[code]in the loop when the user press "q" on the keyboard, the program will go out of the loop, I've tried using Console.Read or Console.ReadKey which is not working because it waits for the user to press the keyboard,but I need the loop to keep running although the user is not pressing the keyboard so in the program the console will be like: AAAAAAAAAAAAAAAA,etc. until the user press "q" on the keyboard,
I am learning Visual Basic from a book and at the end of each chapter the book gives tasks to perform. The task i am currently on involves creating a simple game called "Pick up Sticks". The premise of the game is to choose a starting number of sticks at the beginning, say '55'.
I have a searchbox that queries a database and shows the results in a box below. This is kinda slow when I use the ontextchanged event, cause the database gets queried each time a new letter is written.
How can I make it only do the query when the user is done writing, or each time the user takes a small break?
Making a simple form that is to step through a program iteratively. How can I get it to run a method each time a user clicks a button and wait once it is finished for the next click?
Currently I have the start-key for my vb.net application hardcoded like this:
GetAsyncKeyState(Keys.F2)
Where vb.net sais "F2 As System.Windows.Forms.Keys = 113" on mouse-over.But I want my users to be able to pick their own Key. If I make a drop-down box (combobox) and pre-define some choices in there (Like ESC or F3), all those choices are strings. How can I convert those strings to a System.Windows.Forms.Keys integer? Also, I'd like it to also be possible to "capture" a single keypress. So they'd click the "capture" button, and the next key they hit will be saved as the start/stop button. But I wouldn't even know where to begin looking for that one.
Is there a built in way to know when a user is done typing into a textbox? (Before hitting tab, Or moving the mouse) I have a database query that occurs on the textchanged event and everything works perfectly. However, I noticed that there is a bit of lag of course because if a user is quickly typing into the textbox the program is busy doing a query for each character. So what I was hoping for was a way to see if the user has finished typing. So if they type "a" and stop then an event fires. However, if they type "all the way" the event fires after the y keyup. Like measuring the time since the last textchange event and if it was > than a certain value then it would proceed to run the rest of my procedures.
How to make a program wait until a button is clicked by the user. I want to stop my sequence of codes (statements) until a button is clicked by the user.
how to code a function that causes a function to pause until the user either changes a radiobutton or hits the reset button or that will restart the function if one of the entered txt values or comboboxes Index have been changed and the uptade button is clicked.
I want to be able to run a thread and then at a certain point pause it and wait for the user to enter some text into a text box and then when they press submit i want the program to run again from where it left off.
I'm trying to work out how i can make my multithreaded app stop at a certain point and wait for the user to type something into a text box and click ok. It must then carry on and when a different thread gets to that point it stops again and waits for the user to input some text again.
While navigating to a series of sites at one site the WebBrowser control's DocumentCompleted EVENT is tripped and no other recorded Browser events occur after that. When this happens the hour glass cursor indicates the browser is waiting. From this point it take 120 to 250 seconds of wall clock time before the browser resumes. I am looking for a way to force an abnormal termination without destroying the control. I have tried "Stop", "nav to about:blank" repeatedly without success. How can I force an abnormal termination when the Cntrl is in a wait state?
Consider the following: The last known Browser event to be tripped is a Document Complete event; nothing else occurs after this. When this transpires the Cntrl is waiting.
1:50:657: ============================= ENTER WebBrowser1_DocumentCompleted EVENT ======================================== 31:50:657: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^THE NEW WEBBROWSER STATEMENT
Eg. ""vb.net" timer event trigger on purpose". This application is meant to run at all times to download a web page every minute. To avoid freezing the UI, I read that the best solution is to move the code from a While/Sleep loop to a Timer that will be triggered every minute. The problem I have, is that the user must wait for a minute before the event is triggered:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Timer1.Interval = 60000 Timer1.Enabled = True
[CODE]...
Is it possible to force this event to occur instead of waiting for it?
I am communicating with a USB-HID device. It will successfully complete hundreds of send-receive requests but occasionally get a Null Exception error.
[Code]...
at the rxData.dataPacket(i) = element I will get a NullReference error every now and then. I could enclose it in a try/catch statement, but I'd like to fix the root problem if possible.This device is communicating to microcontrollers, and it is possible that they won't always give a value... but my feeling is this is some sort of UI threading issue. When debugging, even though there is a null exception, many times there actually does seem to be data in dataReceived.data.ToList(). Is there an easy way to place the whole data processing routine on a thread separate from the UI?Edit: Changed code to match answer and give more info on where it is used. Still get NullReferenceExceptions after about 1,000 completed send/receive requests to the HID device.
I have always wondered about this and seen this among lots of programmers. Why is a VB programmer or VB code easily dismissed as too noobish and easy while the same does not apply to Python or Python code? After all, isn't Python as easy as VB is? And it does provide drag-n-drop GUI application building also. So why is it that VB is flamed and yet Python is not?
I've been trying to play with DirectShow but it's getting on top of me and my question on here didn't answered so I'm thinking maybe I should go with a different approach. (DirectShow VB.net can't change recording format). <- Where as that 'works' I can't get it in the format I want it, and I don't really understand it so I'd obviousl like to go down the route of something I can get my head around.
I've googled till my fingers are raw trying to come up with an easy way to record video in my vb.net application, it doesn't have to be fancy, just a preview with a start record, stop record button, that's it.
iam very keen to learn vb.net 2008 so please suggest me how to access world most and best free of cost reading material available on net for reference.and free best book available for vb.net 2008 on the net. there is any complete source code available for consideration.
Lets say I have 30 text fields in a Frame on my form, and I want to set them all to disable (so users can't edit them).Is there an easy way to walk through those fields without having to create an array of text fields?
I.E., in ... VB 6, with an array of text fields, I can do something like this: For i = 0 to 10 txtfield(x).enabled = true. Next i
Is there something in VB.NET where I won't have to use an array of controls, something like this (assuming all txt fields are in a frame):
I'm running stored procedure from asp.net front-end but it's quite long. What is the easy way on running that thing in the background? I mean if I close the browser, I still want my stored procedure to complete not just die. Also, I would like to perform other actions on the front-end while my procedure is running.
Dim energybar As New Rectangle(9, 154, energy, 21)That is my new rectangle, now when I draw it e.Graphics.FillRectangle(Brushes.Blue, energybar)It says there is no width but the integer energy is = to 100...now, how do I fix this? It but be somewhat simple.
I have been using what I think is a simplistic and easy way of reading and writing to/from the registry but whenever I look at code I keep seeing links to DLL's and constant decorations and lines and lines of code.[code]
I saw another forum which discussed how to detect whether a LAN was connected, but I need to know whether my Internet connection from my ISP is up or not (I'm writing a program for day trading, so knowing if my internet connection is down is critical). I know I can simply open a browser in VB and browse to a site and see if it doesn't come back "page not found", but that involves a fair amount of overhead, and if the internet is down, it often takes many seconds to a minute to come back with "page not found". Is there some simple command that will quickly tell me that my internet connection is working? I'm using VB in VS 2008, and currently using XP although I plan to convert to Windows 7 in the next couple months.
After we finished make a project , we need to make setup file right ? is the setup file contain all the component we use in our vb.net ? like Crystal Report component
My app currently uses Interop.ADODB.dll to retrieve data from an access database.My compiled setup file has to include a Interop.ADODB.dll file for the software to work.What would i have to do in order to convert my app to drop the interop file by using Ado.net instead?Would it simply be a matter of changing the references and connection strings or does it involve alot more than that?
