Developing An Winforms Based Event Tracking System Using .Net?
Sep 24, 2009
I'm looking for some advice for an application I currently developing. I'll try to keep this as brief as possible so if additional info is need just let me know.I'm developing an Winforms based event tracking system using VB.Net (VS 2008 Pro). The application collects data via serial bar code scanners and stores this data within a MS SQL Express db located on the same Windows XP Pro workstation that the application is installed on. When the application receives the formatted string of data it checks the db table and sends a reply back to the device indicating whether the data is a duplicate. I have written a PortManager class to handle the serial based devices and this functionality is working well.
I have now been asked to incorporate a new type of collection device into the system. The new device is running embedded Linux and uses TCPIP (POE) rather than serial communication. The device manufacture has assured me he can provide a string from the devices integrated scanner in the same format as my serial based devices.
If possible, I would like to utilize the current application and just add the ability to use the TCPIP devices to it. I was thinking it might be possible to just add a new class (similar to my Port Manager class) to handle the TCPIP based devices.I'm really at a loss as to the best way to approach this. I'm just not that familiar with collecting data from a Winforms application using a TCPIP based device.
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Nov 17, 2010
I'm trying to create a simple user tracking system so whoever has the program open can see who else has the program open. I know how to retrieve the username and everything. What I was doing was updating (loading and saving) a listbox with a text file on the network with the usernames in it. I can't get it to work right and I think its because the simultaneous opening and saving of the same text file by multiple users. I know this isn't technically the best way to go about doing this but it seemed like it should be the easiest. I don't want to make a huge project out of this because it isn't that important, it would just be nice.
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Jun 18, 2012
i would like some help with how to start with my FINAL YEAR project work dubbed "SCHOOL TRACKING SYSTEM" . I am so much lost on how it shoud be like and what to actually do.
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Dec 13, 2009
i am developing a system will be able to detect motion. up to now i am able to stream the video that is connected to my PC to VB.NET. Now i want to switch between the webcam if there is more than one webcam connected to the system. For example, the user of the system will be able to chose any webcam that is connected to the system. I am able to detect all the webcam and display those devices into a ListView. But i don't know how to change the steaming video when the user select the device. Now the video screen show the image form the default webcam.
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Nov 27, 2010
Is HelpStudio Lite still the tool of choice for developing a basic help system for VS 2010? The only mention of this that I can find is in the MSDN library; [url] and it references VS 2008. I just need something basic and (hopefully) free and of course it should not become obsolete anytime soon.
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Jun 15, 2012
I'm sorry if the title is misleading but I have to develop the format for a barcode (either 1D or 2D, doesn't matter). The barcode needs to include a Purchase Order #, Bill of lading #, as well as the Line #, product ID # and quantity of each item that appears on the purchase order. Here is what I've come up with so far:
[Code]...
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Sep 13, 2009
I was in away to develop a system to check any problems installed in a smart card. Such as checking wheter applet fully configure,checking serial no and etc.
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Jun 6, 2011
am developing an inventory management system. have two listview controls. one for ITEM and another for details pertaining date, quantity, cost, issued to and so on. i want a vb.net code that if a given item in listview A is clicked, listview B details are cleared and then the details of that item are loaded and displayed on listview B.there is no criteria of loading like between a range of dates; just all records in the database.
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Feb 11, 2010
I want to listen to events in my windows forms .NET application for the following system wide events :
[Code]...
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Oct 6, 2009
I am developing a program that populates a rich text box and from a click event on a listbox. The data that is being loaded into the rich text box is located in a richtextformat file located on the hard drive. I noticed that when I entered a URL into one of the richtextformat files that it appeared that I was able to click on the text as if it were a link. So I wondered if it was possiable to click on that URL and open a web browser from the loaded richtextformat file? I have read several articles in regards to opening hyperlinks in rich text boxes which can open a web browser with a given URL.
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Jun 11, 2009
I have had several occasions recently to access a specific class several times over a relatively small time frame.So I've been storing the value of the class in Session and trying to access it on page load, if it's not available creating a new instance and storing that in session.
So instead of constantly replicating the same code for different classes on different pages I'm trying to create an extension method to do this for me.
[Code]...
I'm stuck on what to do when I make my new instance of my class (it would have to have a New() sub)
I'm not sure where to go from here... or even if this is the best way to do it.
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Aug 6, 2009
I'm trying to add some extra key/value pairs to a combo box using VB.NET. The initial item list is generated from a hashtable, which contains a collection of objects.I've managed to add the extra values to the box using the Add method, however I now run into problems when reading back the selected item from the combo box because some list items are objects, while others are strings.
My best option seems to be to load the initial data as key/value pairs by looping through the hashtable, however this doesn't seem to be working too well either because I'm still getting errors.I'm getting frustrated because it's taking me hours to do something that should take 5 minutes!
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Mar 21, 2010
I am currently working on a multi branch desktop based project using VB.NET 2008. My Admin want to see the list of currently working branches and not working branches. Additionally they want to know how long a branch is not working.
To display the offline branches I first take a ListBox control named lstListBranch and then upon that control I take another ListBox control named lstListTime to display the offline time.
I want to permanently hide the scrollbar for lstListTime control and want to scroll lstListTime when lstListBranch is scrolled.
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Sep 5, 2011
I need to implement, Controls Based Security in a Windows Forms Application using VB.NET. I tried google but did not get anything much to work with.
I would like if someone, could suggest some books or tutorials.
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Apr 20, 2010
I have a grid containing rows flagged with different priorities. I want to color the high priority rows red, low ones blue, etc. I'd like to set the shade based on a mathmatically calculated gradient rather than arbitrarily assigning colors to specific priorities. How can I extract a single color from a single point along gradient?
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Sep 21, 2010
I'm making a very basic vb.net winforms app, essentially you can drag files into it, and it then uses a batch file to process the files.
It's pretty simple and everything is going to plan so far, it accepts the right files, it uses the batch file to process them and the batch file does what it is supposed to.The only problem is that I don't know how to hook into the Exited event that can/should be raised by the batch file process when the process completes...
I want the DOS window of the batch file to remain hidden while it is running, so I have used ProcessStartInfo to specify the batch file, then set the WindowStyle property of the process to ProcessWindowStyle.Minimised, then used System.Diagnostics.Process.Start(myBatch) to start the process at the appropriate moment.
This is fine, it works and does what I want. However, the only way to tell when a process ends is to use the Exited event. But the Exited event apparently only works with a Process not a ProcessStartInfo. I could switch to use Process instead but then I couldn't (AFAIK) run the DOS window minimised... I've only been writing .net for a few days. This is how I'm running the batch file:
Dim myBatch As New ProcessStartInfo("C:\batchFiles\test.bat")
myBatch.WindowStyle = ProcessWindowStyle.Minimized
system.Diagnostics.Process.Start(myBatch)
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Mar 4, 2010
I'm trying to save some layouts from DevExpress Grid Controls so that users can change the layouts and reload them in at a later use of the control.
My question is this for speed issues I am loading the control via a user control inside of a form. Now my problem is I am creating the control by adding an instance of the control to a panel control inside of a tabbed group control when the tab is made visible and then clearing the control when the control is hidden.
If ClaimsGridPanelControl.Visible = True Then
ClaimsGridPanelControl.Controls.Add(New RXClaimsGridControl(ClaimsBindingSource))
Else
ClaimsGridPanelControl.Controls.Clear()
End If
So inside of the RxClaimGridControl I need to call a SaveLayout method when I am clearing the control. But there is no event, at least that I can find, that triggers when a usercontrol is removed/closed/hidden.
My thoughts for handling the .Clear() would be to raise an event in the parent control and then to handle that event inside of the user control.
Is there some event that I am missing in regards to the removal/closing/hiding of a user control, or is there a better way to do this.
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Nov 3, 2010
i am using in ASP.NET Application somtimes the OnInit Event. Is there something similar in WinForms?
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Oct 22, 2009
I already have KeyPreview set to true in the form properties I'm working on a small program, and I'm having a problem where it seems that some of the controls on it inside groupboxes are not triggering the KeyDown event on my form when I press and release any arrow key, just the KeyUp event. Specifically, I've enabled KeyPreview on the form, and set breakpoints on e.SuppressKeyPress = True in both subroutines, and only the one for frmMain_KeyUp hits the breakpoint.
I added in the two GroupBox events hoping that might mitigate the issue, but no such luck. However, I have a custom control on the form that is specifically coded to ignore these keypresses, and the code works as expected on it.
Private Sub frmMain_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles Me.KeyDown, GroupBox1.KeyDown, GroupBox2.KeyDown
e.SuppressKeyPress = True
Select Case e.KeyCode
[code]....
The code in the user control that "ignores" keypresses is as such:
Private Sub TileDropDown_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles Me.KeyDown
If e.KeyValue = 40 OrElse e.KeyValue = 38 OrElse e.KeyValue = 39 OrElse e.KeyValue = 37 Then
e.SuppressKeyPress = True
End If
End Sub
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Jun 20, 2012
VB.NET RemoveHandler & Anonymous Methods
If I add an event handler like this:
AddHandler s.Click, AddressOf Panel1_Click
How can I can then remove the event handler?
Private Sub Panel1_click(ByVal sender As Object, ByVal e As System.EventArgs)
' Remove code
End Sub
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Apr 28, 2010
I'm trying to add an item to the system menu of my WinForms application. The following is the snippet of code I'm using. When this runs I can see the separator line added to the menu, but my 'About...' entry isn't added. I'm using VS2008, and running on Windows 7.[code]....
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May 17, 2012
I am making a function of an application that when a function is called the application will close all processes that are owned by the user and were started after a specific point. My thoughts on this would be to trigger an event in my application every time a process is started and ended, and only if the processes is owned by the user, the event should get information (e.g. the process ID, name, etc) about that process and add or remove that information to/from an array depending on if the process starts or ends. Then when a function is called end all the processes in that array.
[Code]...
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Aug 3, 2009
Event type clr20r3 p3 4a5c12c0 system.net.sockets.socket Exception and Application crash on some system. while running well on others. i go thorugh many forms and search a lot on google but not able to resolve the issue.
[Code]...
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Sep 11, 2009
In WinForms I could handle the Validated event to do something after the user changed text in a TextBox. Unlike TextChanged, Validated didn't fire for every character change; it only fired when the user was done.Is there anything in WPF I can use to get the same result, an event raised only after the user is done changing the text?
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Feb 3, 2012
My application writes to the event log if there is an error or other status updates.
The application checks to see if there is an event source named "applicationName"and if not, it creates the source (see code below).
This works fine if the user is an administrator.
If the user is not an administrator, an error is thrown when SourceExists is called:
{"The source was not found, but some or all event logs could not be searched. Inaccessible logs: Security."}
In my environment, the typical user is NOT an admin. Therefore, I cannot use the event log in my application.
Is there a way around this, or is the event log effectively useless for distributed applications?
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Oct 30, 2009
I have a UserControl, with a TextBox and a databound property - Value.Value can be any object such as a Color, Array, Font etc.Any time the text changes, the property Value is changed as long as it is valid.Looking at the msdn article: How to: Apply the PropertyNameChanged Pattern , it says I should use the PropertyNameChanged Event patternfrom the control side.Now, If I have DataSourceUpdateMode = OnValidate, then I don't even need to apply this pattern. If, say. my Value property is bound to a colour field in a business object, then after I type red, in the textbox and tab to another field, then any other fields on the form, that bind to the same colour field, are updated immediately.
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Apr 27, 2011
I have used the below code but its not showing the msgbox. What is wrong with this code ?
Private Sub frmSimple_Disposed(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Disposed
Dim result = MsgBox("Are you sure you want to Exit ?", vbYesNo)
If result = DialogResult.Yes Then
me.Close()
End If
End Sub
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May 4, 2011
I have a Windows form UserControl that receives electrical signal waveform data into a 128 element byte array Property every 1,000 ms.
I would like to have the Paint event draw a a subset of the 128 sample points of the array every
100ms (12-13 graphic.drawline operations) to simulate a rolling waveform display such as one would see on an oscilloscope or a medical monitoring device. Is it possible, and if so, how would I set the paint event handler to fire every 100 ms?
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Jun 26, 2006
Adding an item to the System Menu in WinForms
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Oct 1, 2011
'This is the event that is fired as the application is closing, whether it 'be from a close button in the application or from the user 'clicking the X in the upper right hand corner
[Code]....
Im trying to make an application that when you press X, the program gets put in system tray. But i have like no idea how i'm suppost to do that, so did a search on google and found this code. Only VB2010 (what i use) doesn't like the fourth line. Can anybody give me a quick tutorial on this, and make this work in VB 2010?
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