Create A Callback That Returns A Value To Its Caller?
Mar 1, 2011
I am creating a class ("Class B") which is used by another class ("Class A") which instantiates it in VB.NET 3.5.I would like Class B to read a value assigned to one of its properties by Class A every time an event happens in Class B.However, I would like this property value to be dynamically assigned to the property by Class A when the event is fired in Class B.I was thinking about somehow creating a delegate function in Class A that is linked to the property in Class B so that when the event is fired in Class B it would eventually invoke the delegate in Class A so that it returns a value to Class B.I've been reading around delegates (that's how I arrived at the idea), but I am stuck on how to code this up - could someone please help with some skeleton code?
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May 31, 2012
I'm trying to get data with the methods below and I get null response and can't figure out why. I'm just trying out a different way of using a wcf service from silverlight and I don't understand something that I should.[code]...
The employee object will stay null. If I put a break into the service call and follow through the code it finds the correct record from the database and the return statement shows an object with the correct data but still the employee object in silverlight side will remain null.
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Dec 1, 2011
I'm having trouble creating a sub that can create objects of a variable type on the fly. Here's an example of what I'm trying to achieve:
[Code]...
I can't get it to work. I've done a fair bit of research, and looked at generic types, reflection, and other tools, but I'm having trouble determining how best to tackle this problem.
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Mar 2, 2012
i am trying to create a module that will start a thread to go do something. once the "something" is done i want to notify the calling form that the event is complete. i left out the thread stuff since its not relevant to the question. the following code would work fine in VB6, but .net sees it as an error because FRM does not have a FRM.done, "DoSomething" would could called by multiple forms [Code]
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Dec 9, 2011
I have to create a block of code that detects the Local IP address of connected adapter and returns it as string to a TextBox.
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Aug 8, 2011
i want to get caller id to show this caller infoi used addtapi but it show message at initialization like dll info if any one know how to remove this message
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Apr 23, 2011
I am trying to read caller id from a internal modem. modem is caller id enable and it works in hyper terminal. but when i try from vb.net it only shows 'RING'. here is my full code
[Code]...
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Jun 16, 2009
I am creating a component for a third party program. I create a sub-class from a class in the third party dll. During runtime, the program will create an instance of my class. How can i reference to the caller that created an instance of my class? (There are a few class in the program that might use the component that i created.)
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Feb 28, 2012
I've written a series of ASP.NET pages which have several common methods among them. In my ignorance, the best way I was able to find to move those common methods to a separate file was in a Module. However, what I need is a way to identify from which page was the method called?For example, I have a method call WriteToErrorLog with the following signature:WriteToErrorLog(ByVal sender As Page, ByVal Source As String, ByVal Message As String, ByVal StackTrace As String)
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Jan 6, 2009
I have 2 buttons that will open the same form. but depends on which button is calling, the operation will be different. How can I identify that this form is called from button 1 or 2.Also, if we want to have a password in the vb.net stand alone application, should we use shared property?
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Jun 14, 2012
In the SignalR Chat sample, Caller properties are set using the code;
Caller.name = newUser.Name;
Then later on, this property is read;
string name = Caller.name;
I have my own SignalR project, but this one is vb.net, and when i do the same setting and getting of the Caller properties, it doesn't work
Public Sub SetCaller()
Caller.name = "tim"
End Sub
[Code].....
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Jul 21, 2011
I want to create a Windows Forms Application in Visual Basic 2008. I have created my form already, now I just need to add Caller ID capability. how to do this? Will I need any extra components? If so, where can I get them?
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Jul 10, 2010
I have the following
Sub ChangeLanguage(ByVal caller As Object, ByVal lang As String)
Dim c As Control = caller.GetNextControl(caller, True)
Do Until c Is Nothing
[code].....
I call the sub with:
ChangeLanguage(Me, "en")
The problem I have is that I get the error: "Type 'caller' is not defined."If I change GetType(caller) to GetType(vbLogin) it works fine. (vbLogin is one of the forms)I need to find a way to get it working using caller though.
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Dec 29, 2010
I have a few textboxes that have a context menu on them. what I would like to know.. is how to pass the name of the calling textbox to the form opened by the option in contextmenu.
i see that it is under the sender owner.. name.. but how do i get to that in code?
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Jun 5, 2009
i am developing a CallerID application in Vb.net using modem..I am sucessfully getting the Callers No through Hyperterminal.How can i capture this Number through Vb.Net and Store it in a Database.
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Mar 6, 2012
i am developing a CallerID application in Vb.net using modemI am sucessfully getting the Callers No through Hyperterminal
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May 28, 2009
I am trying to connect to an running instance of activex component in IE.I am using following piece of code. However, I am getting error 429 "Cant create activexobject"
Dim obj As Object
Set obj = GetObject(, "MyTimer.ctlTimer")
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Dec 12, 2010
i would like to build a very simple program that connects to my modem and outputs in grid format, caller display, date time etc etc.Ive done loads of searching and i've found a few examples online but most are for VB6 and ive spent ages trying to upgrade them but with no joy!I have found two enxaples that work with VB2010 but i have struggled to make them work and also they seem way too advanced for me to learn from.
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Jul 25, 2009
very often i see code written from others, and when browsing over a function i want to see where this function is called from. Even when i debug my own code, i'd find it a useful feature.In c++ this feature is default in visual studio(its called browse-something), but i havent found any such thing for VB.NET yet, any ideas?
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Oct 17, 2011
how to write mobile phone caller in VB 2010..please give me samples or video tuts or pdf books or any instruction about that....
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Jan 31, 2012
Can I connect phone landline to my computer and when someone call me his information appears by his phone number this information already exist in database.. I want to know is it a service from communication company or can i do it by code just plug the cable into my computer ?
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Mar 25, 2009
I have a form with a "Send" button to test a code to send SMTP emails.It fires the click event when I hit the "Send" button, but the email is never sent if I leave the form running. When I close it, the email is sent.This is not the needed behavior because the User may never close the Application (this is a Client/Server application, not Web).Below is the code behind the "Send" button's click event[code]...
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Jun 19, 2012
I'm trying to use a .DLL which Callbacks a Function of my project, but I can't get it to work.
Declaration from .h file of .DLL
void DLL_EXPORT SetEntity_CallBack(bool Active, _
void (*Entity_Callback)(int Site, int Application, int ID, _
[Code].....
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Dec 30, 2009
I have a URL lets say . some time i need to send HTTP and some time i need to send it to HTTPS for that i created a enum:
Private _protocol As Protocol
Enum Protocol
HTTP
HTTPS
[CODE]...
Now when i get value back from protocoltype it returns me integer value as enum do so tell me how to get string from enum or other substitute.
Dim targetUri As String = setting.protocolType & "://www.mysite.com"
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Aug 17, 2009
I have this code obtaining data from a sensor that is sending a string that contains 4 numbers separated by a tab and terminated by an end of line/ I am trying to use an asynchronous callback to get the data over TCP. That problem is that the callback function is not grabbing the complete string. Sometimes it will, other times it gets half in one retrieve and half in another. I need the callback to hold off until it gets a newline character.
Code:
Public Sub readVaisala()
Dim ip As String = "192.168.1.30"
Dim portNumber As Integer = 23
Dim time As Int32 = Now.Second * 1000 + Now.Millisecond
[code].....
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Mar 3, 2011
I have a C++ dll that contains a callback. The callback has one parameter that is passed in and one parameter that is passed out. The parameter that is passed from C++ is a variant. So, we are going from a variant in C++ to an object in VB.NET. The function works. However, It seems that there is a memory leak on the VB.Net side. This must be a Marshaling issue. I have tried to use the MarshalAs Functions, but to no avail.
VB.NET
Declare
Function EnableWriteNotification
Lib
[code]....
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Jan 4, 2011
there is error when i use callback function A callback was made on a garbage collected delegate of type 'skynet1!skynet1.Form1+myCallBack::Invoke'. This may cause application crashes, corruption and data loss. When passing delegates to unmanaged code, they must be kept alive by the managed application until it is guaranteed that they will never be called.
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Aug 8, 2011
I am working on a Twitter application and with the authentication process, Twitter returns Two Tokens with a Callback URL, For example: [URL]. How do I extract each token and put them into separate strings?
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May 12, 2011
I am writing classes in VB.Net (both managed). The main class "A" creates an instance of "B". Class "B" must call a method of Class "A". I need to know two things (syntax, etc...):
1. How does class "A" tell class "B" what method to call?
2. How does class "B" call the method?
The method must pass back an array of Shorts (in this particular example), either as a return value, or as a ByRef argument.I don't want to use an event if I don't have to. The execution is timing critical. (I assume event handling involves a lot of overhead by the operating system, but I may be wrong.)
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Feb 2, 2011
I do not know Why I am recieving a TimeOutException in my code:
Dim Uri2 As New Uri("http://localhost:8733/Design_Time_Addresses/ssWcfService/Service1/")
Dim binding2 As New WSDualHttpBinding()
Dim callback = New MyCallBackClient()
[Code].....
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