My windows application needs to raise an event in a COM callable assembly so unmanaged code can pick up on the event.I am sick of this. All the crazy tags required for COM callable is doing my head in.
View 1 RepliesI have a windows application which raises a particular event.I need to create a COM callable class whic will allow VB 6.0 to subscribe to this event.I have done a fair amount of research on this and am confused as hell.
View 3 Repliescan I call shared events contained in one class from another class?
for example:
logonclass.vb : handles login logic and authenticates against database
logonmanager.vb: hold current user reference and some logon and timeout events
Logon.vb: A form with a submit button.
I would like to do something like this but I can't get the compiler to agree with it
If VerifyEntries() Then
Try
privLvl = LoginClass.AttemptLogin(txtUserName.Text, txtPassword.Text)[code].....
If this isn't the proper way to wire things together let me know so I can learn to structure differently. In my planning it seemed like I was raising a lot of extra duplicate events from my logonclass to my loginmanager class. Then the loginmanager had to raise it again for the main form to see the change event. It got me thinking that if I publicly shared the events and could raise them from wherever then it would cut down on the amount of events I needed in code and the amount of them flying around at runtime.
I am currently trying to make a calendar project it has 2 user controls one is the calendar and the other is the calender day control. When the month changes in the calender control I need to raise an event in daycontrol to update any holidays. In the calendar control I have the following code for the event:
Friend Event MonthChanged()
Public Sub New()
' This call is required by the Windows Form Designer.
[Code].....
I want to have a collection of a class which inherits picturebox, with a couple of extra properties, so essentially the same. Only I get an error at runtime saying : 'An error occurred creating the form. See Exception.InnerException for details. The error is: Object reference not set to an instance of an object.' Here Is my code, I know that the error occurs here :
[Code]...
I have a TAPI program that is very similar to [URL] I have a delegate ...
Delegate
Sub TapiEventCallback(ByVal
dwMessage As TapiEvent,
ByVal dwParam1
[code].....
From my program TAPI will call the number. My problem is that its not raising any events. I really need CallStateChange. I raised it from address and moved it up to my TAPI Manager. I put break points everywhere and I can not get anything to raise.
I have 3 classes in 3 separate dll.
1) Class "BaseForm" that inherits from System.Windows.Forms.Form with "MyEvent" declared as Public Event ()
2) Class "MyForm" which inherits from "BaseForm"
3) class "MyClass" which has a public property "ExternalObject" of "BaseForm" type (the private variable is declared WithEvents)
I make the following steps:
1) intercept the Form LOAD event in "BaseForm"
- Instance the class "MyClass", Assign public property "ExternalObject" = Me
- I do a RaiseEvent "MyEvent" in "BaseForm"
2) "MyEvent" is triggered BEFORE in "MyForm"
3) AFTER "MyEvent" is triggered in "MyClass".How Can I Raise event Befor in "MyClass" and then in "MyForm"?
I'm creating macrobutton fields in Word by .NET to add fields. I need someway to figure out when a field is copied and pasted. Is there a kind of event which will be reased within Word to .NET?
This is the code to generate the fields:
[Code].....
General I need to add a field to Word with a given name and a guid and when it's clicked, moved, copied or pasted. I need an event to do something with it.
My application has 1 main form and three other forms which raise events to my main form. I noticed that the memory starts at 77,000 K and increases substationally over a few hours maby be to 250,000k and ever increases.The main form has a dataset and a bound datagridview which gets refreshed with data. Basically it's a taxi booking application. The booking form raises an event to the main form and the main form refreshes the jobs and displays them on the dgv.
View 8 RepliesI'm trying to write a wrapper to a service, which will be used by an existing VB6 project. I've got most of the basic framework working, except for one important aspect: I can reference the wrapper in a VB6 project and subs/function calls etc. work as expected, but events do not. The events are visible in the VB6 app, but they never fire.
VB.NET Code:
Public Event Action_Response(ByVal Status as String)
Public Function TestEvent()
RaiseEvent Action_Response("Test Done")
[Code]....
So, the cmdTest button code prints 'Done' as expected, but the Action_Response event doesn't fire. Is there something else do I need to do to get the event to fire?
Raising events in multithreaded classes?
I am running a class(gamepad handler) that uses many child threads to check for key input and the like then it raises events to my form to sort out the needed reaction, Is there a way to make the event raises on the same thread as the class itself.
the question is really what is the correct convention (style) for raising and handling events. When a button is clicked it is generally handled by this method. [Code]
I have recently been trying to follow this convention by creating my own EventArgs class and inheriting the system.eventargs, Then adding my own properties. The problem is as my projects get bigger/complex I seem to be writing multiple eventarg classes. I then decide to try and create a generic eventarg class but this then seemed pointless thinking it would be easier just to pass the object directly instead of wrapping it up in "someEventArg" i have created.
I have a custom (inherited) TabControl which adds Drag/Drop functionality to it, so that one can drag the tabs around, either within the same control (to re-order them) or to and from other TabControls. I've noticed some time ago that my TabControl however was not raising its MouseClick and MouseUp events (or actually: it is not calling its OnMouseClick and OnMouseUp methods, which comes down to the same thing). I've been struggling with this problem for a long while and I finally figured out what is happening. I'm no closer to figuring out what to do about it though... The problem seems related to the drag drop functionality. I have this code in the OnMouseDown method (which is raised as usual):
[Code]...
I am attempting to test that the event handlers between an interface and controller are wired properly. The system is set up like the example below:
[Code]...
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()
[CODE]...
long story short, I have created a ListView type control, using UserControls for the parent control and the ListViewItems. Most the of the control is written and works fine, right up to the point where I tried to replicate the 'Control.SelectedItems(0).Index' property and the 'SelectedIndexChanged' event.
Each child object knows its index value, and could pass this value via the SelectedIndexChanged event (assuming this is how it works in a normal ListView control -- user clicks on an item, and that item fires an event updating the selected index value in the parent object).
How does the child object raise an event in the parent object? I have a feeling this could be done with Delegates, but I'm still learning about their usage.
I have a solution which contains among other things a project which is COM callable.
I would like to put some breakpoints into this and step through it but VS tells me "The breakpoint will not currently be hit".
how I can step into a com callable?
This is a dumb question, but I just cant find an answer. I want to do something as simple as this in IronPython, something I did in asp.net vb.net to capture the id of a table displayed in a gridview or datagrid
iid = e.Item.Cells(2).Text
But I get "Tablecellcollection is not callable".
I have a project as part of my Windows Solution which is COM callable and auto registered when I run my application.
After running my Windows application I run a VB 6 application which references my com callable assembly.
I would like to step into this code but my breakpoints aren't hit at all.
I need to call functions of "well documented" C++ dlls from a VB6.0 application. how to create VB6.0 callable C++ wrapper.
View 3 RepliesI have been writing a COM callable assembly for my current solution allowing unmanaged code some access. I have just been told that I can now start using 3.5 of the framework having used 2.0 for some time.I then came across WCF and was wondering if I could use any of this to create my application api and allow access from anmanaged code.
View 1 RepliesI have created a COM callable assembly which consists of an Interface, a single class which implements the interface. In this case the implementation is a single method.I have registered the assembly, created a type library and added the assembly to the GAC.I thought about opening an Office application like WORD or EXCEL 2003 and trying it from there but beyong referencing the COM assembly I have no idea how to code it.
View 1 RepliesI need to create a DLL that's callable from C, that executes database queries and returns results. The first tool I reached for was VB, and I found it easy to create a DLL, but when I view the DLL using dumpbin /exports, I don't see any functions.
So, my questions:
1) Is VB the right tool for the job? If not, (The ideal solution would be a 3rd-party DLL that will let me do database queries -- a friendly higher-level wrapper above ODBC. I've searched around and come up empty, but maybe I haven't looked in the right place).
2) If VB is the right tool for the job, how do I export a class method so that it's callable as a function in a legacy C environment?
More details:
1) The target environment is Mercury Loadrunner VUGen. It's able to import DLLs and make function calls, but the environment is (non-.NET) legacy C.
2) My development environment is MS Visual Studio 2008
I am writing a custom backup program and learning as I go, everything has been fine up to now. When I click a button the following is run:
Private Sub BtnCopyDir_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnCopyDir.Click
If My.Computer.FileSystem.DirectoryExists("C:TestDirectory") Then
[code].....
Is there any limit to the no. of handles assigned to an routine. Well actually my form form has about 80 controls and when ever the user press the enter key, focus must be to the next control. so can I handle all the 80 keydown events in one routine, or is there an better way.
View 3 RepliesI'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.
View 6 RepliesI am adding a button on the form dynamically, and how to add click events for that but
View 2 RepliesHow should I handle events in this situation I have "Class1" with a "PropertyHasChanged" event.In "Class2" I've declare a Public Member Variable WithEvents of Type Class1.As well, Class2 has the Event "OtherPropertyHasChange".In a Form Class I've declare a Public Member Variable WithEvents of Type Class2.The Form Member has access to the "OtherPropertyChange" Event but not the "PropertyHasChanged" Event.Question is,how do I accesss the Events of Class1 from the Form Class?
View 6 RepliesI'm relatively new to vb.net. I just created an simple Electronic Raffle web application via Visual Studio 2005. It's working just fine since it just basically returns a random winning entry queried from an SQL Server database. However, to make the raffle draw more "dramatic", I would like display random entries before actually displaying the winner. I tried creating a for-loop which displays random numbers before displaying the winning entry but only the end result (winning entry) is displayed.
I even tried to display an animated gif file then hide it again before displaying the winning entry but only the winning entry is displayed when I click on the "Draw Winning Entry" button.Is there a way to set the sequence of events in a web browser such that the program should display the image first then hide it after 5 seconds then display the winning entry afterwards?
is there a form event that occurs before the load event in a winforms application? I have a winform app that can be run in batch mode and I don't want the form to load at all. Otherwise I could just hide it in the form load event but I figured there's probably a better way.
View 4 Replies