Delegates - .net Possible To Monitor Raise Events Across Applications?
Oct 1, 2009
I am hoping there is a way to do this.I have a base class that has event handling in it. My console application is running my workflow. Part of that workflow is to raise events at specific intervals in a separate thread to broadcast the workers' current state (a heartbeat I have heard many call it).
I also have another program in the same solution that is a windows form that I want it to be able to listen to what is going on in the console application so that it can display the worker states. I have tried running both at the same time and verified the events are triggering, but the monitor is not finding any of the raised events.
I am fearing that there is no way to do this, and I will need to go to a database logging method or something else... but in the off chance someone knew how to communicate between applications with event (or event-style) logic, I would appreciate it.Currently the applications are running from the same location. The goal is that the monitor application will eventually be attached with a broadcaster for our network so that our workstations can monitor for certain worker states without being logged into the machine and the main monitor will show us the full status of all the workers.
I have a windows applications. Form 2 is child form of Form1 . Basically when button on form2 (child form) is clicked, it raise an events, which writes something in testbox on form1 (parent form). This is my code
parent form form1
Public Class Form1 Public mycount As Integer
[CODE]..............
This is the first time I am tring to use events.. I am not sure what's going wrong.. the textfill event is never called from form1.
What is the difference b/w Delegates and Events. I have little bit confusion. Where delegates are used, and when we have to used delegates. Can, you give some examples(both delebates and events) in vb.net.
I am using AddHandler to wire a function to a control's event that I dynamically create:
[Code]...
This code is generating a run-time exception stating: Unable to cast object of type 'MyEventHandlerDelegate' to type 'System.EventHandler' What am I not understanding about System.Delegate even though AddHandler takes as an argument of type "System.Delegate"? What Type does "EventHandler need to be to cast to a type that AddHandler can accept?
I have ended up with the following event structure in a custom control - it seemed to be the recommended way for my scenario in MSDN (though it wasn't easy to follow!) This is the MSDN page I used,MSDN - How to: Implement Events in Your Class.
[code]...
What now has me totally confused (even more so than I was about setting up the above pattern) is what to declare in the Interface? I wanted to declare the event in the interface since there will be several other classes that do similar things and they need to be used interchangeably (hence an Interface in the first place) and if I've gone down the Interface route it seems smart to make sure the 'minimum' content that each class will have to implement declared in the Interface...
I have form 1 which will raise an event for form2 after doing some calculations. I know how to raise an event in form2 and then write the sub in form1 but i cannot do the reverse... how can I do this in reverse??? I cannot raise the event sub in form2 is not responding.
Example: Form1: Code: Public Class Form1 Event test() RaiseEvent test() [Code] .....
I'm using a com object in my vb net application. I'd imported the com library and everything is fine.But the object does not raise events, None. I need to know if there is some way to achieve that it works.
I was wondering about the EventInfo.GetRaiseMethod and EventInfo.GetOtherMethods methods. Apparently, the CLR supports 4 kinds of methods associated with events: add, remove, raise, and "others". But events created in C# only have add and remove... I assumed that raise was used in VB, since you have to specify a RaiseEvent method when you declare a custom event, but apparently it's not the case: GetRaiseMethod always returns null.what's the point in having a raise method associated with an event if it's never used? Is there a specific MSIL instruction to raise an event using this method? (I couln't find anything like it in the opcodes)what are the "other" methods returned (well, not returned actually) by GetOtherMethods? What's are they supposed to do?are there types in the BCL that implement those special methods?
I'm trying to understand the concept of Raise Events and threading, From this tutorial i've just read in the author example he wrote that you need to use an event when calling sub when using threading, but he didnt elaborate enough in this subject, why can't I just call the function/sub as i always do?
EF Navigation properties don't raise OnPropertyChanging and OnPropertyChanged Events.When looking into the entity framework auto-generated code a simple property will have a setter that looks like this:
Set OnNameChanging(value) ReportPropertyChanging("Name")[code]......
Seems like the navigation properties should call just call the 4 change notification methods. Do you have any insights on why the EF generater would be implemented in this manner? Is there an option somewhere to turn on notification or a work-around? Also, I assume that editing the designer generated code is bad practice, correct?
I've created a VB.Net ClassLibrary with a UserControl in it. I can load it from an HTML page and call the methods that I created. This works as expected. I've tried several examples for how to raise an event from the VB code to the js caller, and none of them seem to work (I'm using IE7).
Ok, so I'm writing a basic windows form application in VB.net as you do and need to be able to raise keyboard events based on data received from the serial port. I'm able to receive the characters that I want (lets say a lower case c) and display them. Its also easy enough for me to find the keycode. What I want to do though is tell windows that key "c" has been pressed. The application is paired to a bluetooth terminal, I wanted to have the experience of writing the code behind this myself rather than using another library although it seems I've failed already. How would I go about doing this?
I am very confuse over a Raise Events example and using delegate as a function pointer: I am clear with this function pointer example program below which creates a generic sort function for sorting integer arrays without changing the main sort function. ' Returns True if need to swap Delegate Function CompareFunc(ByVal x As Integer, _ ByVal y As Integer) _ As Boolean
Here are two alternative target methods for the delegate - one for an ascending sort and one for a descending sort: Function SortAscending(ByVal x As Integer, ByVal y As Integer) As Boolean If y < x Then SortAscending = True End If End Function Function SortDescending(ByVal x As Integer, _ ByVal y As Integer) As Boolean [Code] .....
I am working on a Windows Service application in VB.net 2008. The main objective of the application is to monitor starting and stopping of applications listed in a file. I build the service as system level by using
mManagementStartWatcher = New ManagementEventWatcher("Select * From Win32_ProcessStartTrace") AddHandler mManagementStartWatcher.EventArrived, AddressOf
I want to monitor all windows copy to clipboard evets and add the objects that are copied to the clipboard to a list in my application.. how can I do that?
Problem that you may have when dealing with two objects that are raising some events. Here, to make it obvious, I am closing the form, but the problem can be experienced with any other 2 classes event. First, what is the problem !
Let suppose that by pressing a button, you want to raise a custom event, then execute a method and then close the form
In that case, you may use a code similar to this
Event BeepIt()
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click RaiseEvent BeepIt()
When i use my UserControl in a project my Mouse Enter & Leave events aren't firing, i assume i fix this with a raiseevents in my usercontrol. However when i try to do this it says something about "cannot raise base event from derived class".
I am trying to capture keyboard events in my vb.net applications. I am able to capture all the single key events. I am not able to capture (<) key which is (shift + ,) and (>) key which is (shift + .).
I want to make a process monitor tool with WMI that monitor the processes created or deleted, but the code will not work. Note to reference System.Management,
Can I monitor the registry for changes similar to how sysinternals process monitor does it in VB? I have checked many different articles and C# samples but not come any closer to getting an answer, I would like to know if there an easier way (a VB sample perhaps)that you folks can share. Ultimately I'd like to be able monitor other things too like file system, processes etc but wonder most about how the registry can be done in VB...Would using system.management be a start? Or WMI? if so is there a nice VB sample..
i guess the title pretty much states the question but i will give the senario to be more clear. i have a mousemove() event which i add in my program programmatically and i need a way for raising that event (again) programmatically too. raiseEvent control_mousemove() doesn't work as it says that "'control_MouseDown' is not an event of 'main'."
Imports System.ServiceProcess Imports System.IO Public Class fswService
[Code].....
2 problems: first, intellisense error saying: 'fswService' is a type and cannot be used as an expression. second, I can not figure out a way to pass on to the service the path of the folder to watch (which is stored at My.Settings.userPath).
I am working on a project that is used for key broadcasting. Don't worry nothing illegal, I'm making a multibox application for world of warcraft. However I am having trouble when it comes to launching and manipulating other applications from another.
I have a class that I want to be serializable but contains a public instance of delegate that, apparently can't be serialized: [Code] Is there a way to make it serializable however?
My question is: what is the right way to accomplish this to resolve the ambiguity so that I can pass value or references types and get overload 2, but pass Functions and get overload 1? Can I constrain the types in some way to make this happen?
I've been tinkering with Delegates, and now Multicast delegates. Every time I invoke two delegates It only displays one of the two delegates per invocation.
So func is a function that accepts a string and return a string. In practice, internally, func also utilizez text1, text2. In fact, func can even be a member function with access the object that owns it (something like me or this operator).
And all that can be accomplished without changing the signature of func? How do the compiler do this?
