While I print or preview a large bitmap, VB.NET show a small window with a cancel button.
I do I detect that the CANCEL button was pressed, so I can abort my PrintPage event before the current page is completely rendered?
I have an application I'm working on that is essentially an Excel workbook generator (special input files for our wireshop machinery). Therefore, it's process is lengthy.
Is it possible to build a Cancel feature while it is looping through its collections to process these files?
If so, would I need to implement multi-threading?
I have got my multi threaded application running which is a Windows Service Project.
Basically when the service starts it starts a thread listening on a port for connections. The reason I started this on a new thread was so I could easily control it and not lock up that main worked thread.
Now on that thread when a client connects it dynamically assigns them another port number that is not currently in use and starts a new thread listening on that port and waits for the client to connect to do the actual data crunching.
So basically I have my main project thread, a Main listening thread then the possiblity of 0 to 100 more threads for each connected client.
Now this project should always be running but in the event it needs to be shut down (or server rebooted etc) I want to be able to shutdown the threads safely.
I can down my main listening thread safely but my trouble is all those other possible threads. What I would like is if the service is called to stop I want any of those other possible running threads which would have an active connection to the client to send a simple command like 'STOP' then close the connection gracefully (MyConnection.Close) and end itself.
The only solution I can think of which I don't really want to do is have a global varible (StopThreads as Boolean) and after each command in the thread check that boolean and if its set to true jump to some code to do what I want and end the thread but there must be an easier way? Or is this the best way?
I have made a project on offline railway reservation ticket and cancellation and management wel i have included following things: form wise
1}welcome page (containing news , updates about the software )
2}registration n login page
3}main menu (Containing links to all tools and services i included in software)
4}ticket regestration (fare calculation and deduction and special discounts included)
5}ticket cancelation
6}PNR CHECK
7}FEED back form
9}Splash Screen
10}Rules n policies ,refund rules
11}Gerneral information
12}RTI act
13}Railway Map
15}Service area Covered
16}Train Halt Stations , total Halts per train according to Journey and distance Stations Between Journey
17)Trains and stations Codes
18}Train Arrival and Departure Timings
Thats It, Full database on Ms Access ..and Text Strings.Now Is this enough Or shall i Do add some thing More ... if u think its incomplete Plz suggest Some topic that i can add to This project.
I'm using a background worker to in an Excel VSTO application to throw up a progress dialog box with a status bar and a cancel button to escape from long running calculations. It's working really well, except for one issue. I'd like to use a Modal Dialog, so that the UI behind the dialog gets locked up, instead of a Modeless Dialog. If I use .ShowDialog() instead of .Show(), everything is great until you hit the Cancel button on the form. Following things in the debugger, the cancellation happens, it just takes somewhere in range of 30 seconds. If I use .Show() on my form, then the cancellation occurs immediately as it should.
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Basically on my form I have a listbox containing data. Under the listbox I want to place a button named "btn_PrintData" or something to that effect. The user will click this, the print dialog box would come up and bingo they could print the contents of the listbox.
View 1 RepliesHow do i add a simple print button in vb 2008 to allow me to print the form?
View 1 RepliesI just wanna print my whole richtextbox using print document. I need to count words till the end of the page and so print them. And it must be bounded in a rectangle.(e.marginebound) from top,left,right and bottom. Also i don't know ho to use print preview. writing a proper print Document. It's the end of my Wordpad project and i just cant write a good printing!
View 1 Replieshow to detect when the "DEL" key has been pressed in a VB 2008 windows form?
View 5 RepliesI need to detect if any version of the .NET framework is installed as we are deploying a .NET 2.0 app via logon script (ie XCOPY deployment) to all PCs in our network. The .NET app will be set to start when a user logs in, so we need to determine if .NET 2.0 (or higher) is installed before we deploy the app otherwise the user will get an error each time they log in. Is there any sure fire way to detect .NET via vbscript or batch file? All of the results I have found on google don't seem to be that reliable.
I have recently written a program that detects installed programs in the same way that Add/Remove Programs does but the problem with this is that even Add/Remove Programs does not seem to show the .NET framework on all PCs that have got it installed (like my home PC for example, definitely has .NET 3.5 installed but its not in the Add/Remove Programs list).
I want to create an If End statement like so...
If (webBrowser is finished loading) then
do some stuff
End If
and it needs be within Private Sub tags so it can't be
Private Sub webbrowser1_documentcompleted
I need to know a way to detect if the mouse has been clicked anywhere on the screen. So as long the program I am making is open when the user clicks my program needs to do something. Please let me know as soon as possible if this is possible and how you do it.
View 5 RepliesI have a program that parses INI files (yes yes, I know, but I'm stuck with using them, not my own request), and it downloads external images (if the INI contains the path) to the program and cache's them.
Recently, I've run into a snag with the system. Most of the images use Imageshack for storage, but one of them has suddenly 404'd, and whenever I set it to the picturebox to the downloaded image, I get an out of memory error rather quickly (and the file itself is 1kb).
I guess I need to implement a checking system offline to find out if the image is actually an image or just a '404' text...but is there a way to not have to implement this clientside, and have it be checked when I download it?
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how can i detect mouseclick outside the form (for example desktop)
View 5 RepliesI have been playing about with the WM_SYSCOMMAND Message and more specifically with the SC_SCREENSAVE parameter which is a cool way to pick up when the screen saver is activated as seen below:[code] What I can't seem to find is if there is a way to detect when the screen saver comes off.
View 4 RepliesI've come across involving a PictureBox.I am trying to create a quick Paint-like application, but I want something to happen in it. I want it so that when you draw or have drawn in a certain area of the PictureBox, you trigger events to happen (but they must only trigger once. This doesn't mean only one event can happen, it's just that each event can only happen once). How would this be possible to implement in my code I have now?[code]
View 5 RepliesUsing .NET connector: [URL] A field is set in MySQL as:
decimal(6) zerofill not null
How can the "zerofill" flag be detected in VB?
I can detect the type of mouse cursor (normal, hand etc) inside the form but i need to detect it when the cursor is outside the form.
View 2 RepliesIm new to programming.I work for a research in Sri Lanka.In our research data is collected on windows mobile devices.I am the person who connects the devices(Known as JUNOs) and copy the data to the hard drive.But when Im not around others should copy the data.But they havent got IT knowledge.I want to create a simple software which detects the JUNOs when connected,show a message that a device is connected(Ex : JUNO1 is now connected),and then a button to copy and paste data to hard disk.(Ex: Press copy button to copy data)
View 4 Replies3 things , 1. how can i detect all the existing web browsers installed on the computer (IE , Mozilla ect'...) and put it in a combobox or something like that. 2. after i detect and select a browser , how do i launch that specific one? 3. how can i know which one is the default browser
should i see if the browser file exists ? ( IE7.exe, ect'....) or is there a more simple way ?
I have a listview, and when you right click, it shows some things. I need to make it see if an item on the listview is selected. Is there a way to do this?
Like, this doesn't work, but in code it would be like
If listview1.HasItemSelected = true then'code here end if
Basically i want to send a created file over a local network via FTP. If the username/password/IP address is incorrect the application just crashes.
Is there anyway i can detect if the credentials are correct? etc.
Code I'm using to upload the created file is;
My.Computer.Network.UploadFile("C:lini.ftp", "ftp://" + ftpUser.Text + ":" + ftpPass.Text + "@" + ftpIP.Text + ":21/Usb0/launch.ini")
I would like the text in a button to display "hello" when it is first clicked, and "world" when it is clicked again. But I don't know how to write code to detect the second click.
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Private Sub StartStopButton_MouseClick(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles StartStopButton.MouseClick
Button1.Text = "Hello"
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I've been using 'GetScrollInfo' to find the position of the scrollbar on a ListView and I can detect when it hits the bottom of the list. Is there anyway I can raise an event when the scrollbar changes? At the moment I have it working by using a timer but I would rather if possible create an event to fire my routine.
View 1 RepliesI have a problem in detecting the 30 minutes interval in time scheduling like for example i have a combobox(starting_time) and combobox2(endtime) and I select there 9:30-10:00 it has 30 minutes I want to show a message box that I should be 1 hour.
View 12 RepliesHere's my work.
[URL]
How can i print the search result.
I have been able to do the exercise's in the first 2 chapters and half the exercise's in the third chapter of the text book (programming in visual basic 2008, Julia Case Bradley & Anita C. Millspaugh). but this one is making my head want to explode. please point me in the right direction with this.
Heres the problem. The company has instituted a bonus program to give its employees an incentive to sell more. For every dollar the store makes in a four-week period, the employees receive 2 percent of sales. The amount of bonus each employee receives is based upon the percentage of hours he or she worked during the bonus period (a total of 160 hours). The Calculate button will determine the bonus earned by this employee, and the Clear button will clear only the name, hours-worked, and bonus amount fields. A Print button allows the user to print the form. Do not allow missing or bad input data to cancel the program; instead display a message to the user.
Here's my code so far. its giving me the wrong results. i have tried many different ways,(hence the commented code) but I just dont know where im going wrong.
Public Class VB_Sales
Const BONUSHOURS As Decimal = 160
[CODE]..............
Attached image(s)
i want to populate a report and print it directly without the user hitting the print button.
i have this working in a diffrent project but for some reason it wont work in this one.
i get the error missing parameter, on the last line of my code
Dim paramFields As New ParameterFields
Dim paramField As New ParameterField
Dim discreteVal As New ParameterDiscreteValue
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Anyway, I was just wondering if anyone knows how to do these from a simple text box. i.e. 'TextBox1'.
I'm just learning VB and it's only a simple text editor but I can't find any good sites or posts that help me in understanding how to do it. These are not really covered in any of the 'beginner' books I have acquired either.
My instructor told us how to print documents and how to use databases. What the instructor did not mention is how to print or print a preview of records within a DatabaseDataSet. The book "Programming in Visual Basic 2010" does not explain how to print or do a print preview of Database Source records from within a form. The only thing I was told was to test the print document first before you try to do a print preview. Within a form I used a DataGridView to add, delete, and update the database. So now all I need to do is figure out how to print the updated records from the DataGridView and how to print a preview of the records within the DataGridView. So I hope my question is clear enough to give me assistance on how I can perform these two actions. Thanks this would be a great help, and since the class is online we can get assistance from any sources that we have.
View 5 Replies