I need help

[vector9]

I cant call a subroutine that is located in my form from an external module.......like

Form Code:

Public Sub Hello(byval strString as string)
Code Here
End Sub

Module Code:

form1.Hello("Hello")

what is wrong..............is there another syntax? because in the form i can do

Module1.(some subroutine)

??????

[MrPolite]

form1 is a class not a module, you cant just access one of its subrutines unless it's declared as SHARED.
You should do something like this:

dim frm as form1 ' create a new form1
frm.hello("hello world")

[vector9]

that would work but here is the problem........

i call a subroutine in the module from the form but that module calls a sub in the form and it has to be the same instance of the form is that possible?

[vector9]

would

dim frm as form1

would frm be the existing instance of form1? or would it create a new one?

[MrPolite]

Originally posted by vector9
would

dim frm as form1

would frm be the existing instance of form1? or would it create a new one?

it creates a new one
You can pass the form as an argument to the function that you are calling, but I wouldnt recommend it You could also use delegates, but the easiest way is to declare your sub as shared (I guess you could just put the code in a module rather than accessing it from the form, but anyways if you wanna do it this way, this should work: )



Public Shared Sub Hello(byval strString as string)
Code Here
End Sub

[vector9]

i cant refer to objects on the form in the shared sub???? this sub has to control one of the objects like change its text property

[hellswraith]

Put a variable in the module that will hold a reference to the form you want to call a sub on. Then set that module variable either with the forms load event or from somewhere else before your module will call that forms sub.

[MrPolite]

Originally posted by hellswraith
Put a variable in the module that will hold a reference to the form you want to call a sub on. Then set that module variable either with the forms load event or from somewhere else before your module will call that forms sub.

or use a delegate

[vector9]

ok i am more of a novice programmer and have no clue what some of this stuff your saying is.......could you be more elaborate and include some code samples?

[vector9]

when i use a shared sub i cant control any objects in the form class. what can i do cuz this sub in the form class (that im calling from an external module) must controll an object in the form class

[vector9]

up

[vector9]

anyone?

[vector9]

up

[robbedaya]

I think this is what you try to do:

look at the attachment

[vector9]

sorry but its not..........i need to call the sub in the form from the module without creating a new instance of the form.

[robbedaya]

don't think you cann. VB.Net is fully object oriented. Also a form is an object. If an object doesn't exist how can you call a method of the object that doesn't exist. I think Java supports this (calling methods from the wrapper class) but vb.net not doesn't really support this.

[hellswraith]

You CAN do this, when I get home from work, I will create a project to show you how. It is fairly easy to do.

[hellswraith]

I don't have the .Net framework here, but try something like this:

In your module, put this code:

Module Module1
    Dim myForm1 as Form1
    Sub MySub()
    if myForm1 <> Nothing
           myForm1.Hello("Hi")
        end if
    End Sub
End Module

And in your form put this code:

Private Sub TheSub()
        'Give the module a reference to this form.
        'This will allow your module to call this forms subs and functions.
        Module1.myForm1 = Me
 
        'Now call your sub in the module to do something.
        'It will in turn call sub hello on this form.
        Module1.MySub()
    End Sub
 
    Public Sub Hello(ByVal s As String)
        MessageBox.Show(s)
    End Sub

[robbedaya]

what you are suggestig to do is to check first of an instance of your form exists, right? So an instance has to be loaded. How do you create that instance of your form? by seting it startup-form or by loading it in another form. If you don't load this form somewhere else myForm1 will always be nothing.

[vector9]

ok the form instance loads on start up.......would it work if i used the sub Main in the module as start up and create a new instance of the form from the module???? then would i be able to do what i wanna do? or does hells idea work if the form is loaded on start up?

[robbedaya]

I'd prefer starting up from the sub main. And then creating a new instance of your form. Then it should work.

[Booya05]

John Brown, looser John Brown, looser John Brown, looser

[Booya05]

John Brown