Hello Group,
I used something like this in a program of mine:
public class WorkObject
private _myproperty as string
public property MyProperty as string()
get,set trivial
end property
public sub new(byval mp as string)
MyProperty = mp
end sub
end class
public class Work
private _refWorkObject as new WorkObject(String.empty)
public sub new(ByRef wo as WorkObject)
wo = _refWorkObject
DoStuff()
end sub
private sub DoStuff()
'In the real program, DoStuff() gets called after some user
interaction
'and not by the constructor like in this simplified example.
'So I cant pass wo as a parameter, I have to store it as a private
variable
_refWorkObject.MyProperty = "new value"
end sub
end class
public class main
public sub main()
dim IWantThisToChange as WorkObject
dim w as new Work(IWantThisToChange)
system.console.out.writeline(IWantThisToChange.MyP roperty) 'results
in "new value"
end sub
end class
Now, all of this works fine as long as I use a reference type with public
fields / properties (workobject in this case). If I try the same thing with
System.Guid instead of WorkObject, it obviously won't work. Do I really have
to wrap it, or is there some funky pointer like syntax in VB.NET that I just
haven't found yet.
I want something like
public class Work
private _refuid as new Guid()
public sub new(ByRef uid as Guid)
uid = _refuid
DoStuff()
end sub
private sub DoStuff()
_refuid = getdesiredvalue() 'With the variable that was passed into
the work constructor taking the new value of _refuid
end sub
end class
Any help is highly appreciated.
12  1402 
Perhaps I missed something but. In this example, the reference is passed
back via the constructor successfully.
//BUTTON
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
Dim g As Guid
Dim mc As New Work(g)
Debug.WriteLine(g.ToString)
End Sub
//CLASS
Public Class Work
Private _refuid As Guid = New Guid("10001000100010001000100010001000")
Public Sub New(ByRef uid As Guid)
uid = _refuid
Debug.WriteLine(_refuid.ToString)
End Sub
Private Sub DoStuff()
End Sub
End Class
//OUTPUT
10001000-1000-1000-1000-100010001000
10001000-1000-1000-1000-100010001000
--
OHM ( Terry Burns )
. . . One-Handed-Man . . .
If U Need My Email ,Ask Me
Time flies when you don't know what you're doing
"Jonas Pohlandt" <j.******************@dbit-systems.de> wrote in message
news:eo**************@TK2MSFTNGP15.phx.gbl... Hello Group,
I used something like this in a program of mine:
public class WorkObject
private _myproperty as string
public property MyProperty as string()
get,set trivial
end property
public sub new(byval mp as string)
MyProperty = mp
end sub
end class
public class Work
private _refWorkObject as new WorkObject(String.empty)
public sub new(ByRef wo as WorkObject)
wo = _refWorkObject
DoStuff()
end sub
private sub DoStuff()
'In the real program, DoStuff() gets called after some user
interaction
'and not by the constructor like in this simplified example.
'So I cant pass wo as a parameter, I have to store it as a private
variable
_refWorkObject.MyProperty = "new value"
end sub
end class
public class main
public sub main()
dim IWantThisToChange as WorkObject
dim w as new Work(IWantThisToChange)
system.console.out.writeline(IWantThisToChange.MyP roperty)
'results in "new value"
end sub
end class
Now, all of this works fine as long as I use a reference type with public
fields / properties (workobject in this case). If I try the same thing
with System.Guid instead of WorkObject, it obviously won't work. Do I really
have to wrap it, or is there some funky pointer like syntax in VB.NET that I
just haven't found yet.
I want something like
public class Work
private _refuid as new Guid()
public sub new(ByRef uid as Guid)
uid = _refuid
DoStuff()
end sub
private sub DoStuff()
_refuid = getdesiredvalue() 'With the variable that was passed
into the work constructor taking the new value of _refuid
end sub
end class
Any help is highly appreciated.
Perhaps I missed something but. In this example, the reference is passed
back via the constructor successfully.
//BUTTON
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
Dim g As Guid
Dim mc As New Work(g)
Debug.WriteLine(g.ToString)
End Sub
//CLASS
Public Class Work
Private _refuid As Guid = New Guid("10001000100010001000100010001000")
Public Sub New(ByRef uid As Guid)
uid = _refuid
Debug.WriteLine(_refuid.ToString)
End Sub
Private Sub DoStuff()
End Sub
End Class
//OUTPUT
10001000-1000-1000-1000-100010001000
10001000-1000-1000-1000-100010001000
--
OHM ( Terry Burns )
. . . One-Handed-Man . . .
If U Need My Email ,Ask Me
Time flies when you don't know what you're doing
"Jonas Pohlandt" <j.******************@dbit-systems.de> wrote in message
news:eo**************@TK2MSFTNGP15.phx.gbl... Hello Group,
I used something like this in a program of mine:
public class WorkObject
private _myproperty as string
public property MyProperty as string()
get,set trivial
end property
public sub new(byval mp as string)
MyProperty = mp
end sub
end class
public class Work
private _refWorkObject as new WorkObject(String.empty)
public sub new(ByRef wo as WorkObject)
wo = _refWorkObject
DoStuff()
end sub
private sub DoStuff()
'In the real program, DoStuff() gets called after some user
interaction
'and not by the constructor like in this simplified example.
'So I cant pass wo as a parameter, I have to store it as a private
variable
_refWorkObject.MyProperty = "new value"
end sub
end class
public class main
public sub main()
dim IWantThisToChange as WorkObject
dim w as new Work(IWantThisToChange)
system.console.out.writeline(IWantThisToChange.MyP roperty)
'results in "new value"
end sub
end class
Now, all of this works fine as long as I use a reference type with public
fields / properties (workobject in this case). If I try the same thing
with System.Guid instead of WorkObject, it obviously won't work. Do I really
have to wrap it, or is there some funky pointer like syntax in VB.NET that I
just haven't found yet.
I want something like
public class Work
private _refuid as new Guid()
public sub new(ByRef uid as Guid)
uid = _refuid
DoStuff()
end sub
private sub DoStuff()
_refuid = getdesiredvalue() 'With the variable that was passed
into the work constructor taking the new value of _refuid
end sub
end class
Any help is highly appreciated.
Hey Terry,
the crucial point is, I cant do it in the constructor. By "it" i mean
setting the value of the uid. Simply because I don't know it by the time the
constructor gets called.
It has to be done in the DoStuff() sub, which is called sometime after the
constructor.
In the real program, the work class is a Windows Form (or rather a subclass
of that).
The DoStuff sub is called after some user interaction. So you see my problem
is, that
I have to store the constructor paramter reference "uid" somehow, so that
dostuff can assign
it the desired value. In C/C++ I could just use a pointer variable to hold
the reference to the Guid
but I don't know how to do that in VB.NET. Perhaps I missed something but. In this example, the reference is passed
back via the constructor successfully.
//BUTTON
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
Dim g As Guid
Dim mc As New Work(g)
Debug.WriteLine(g.ToString)
End Sub
//CLASS
Public Class Work
Private _refuid As Guid = New Guid("10001000100010001000100010001000")
Public Sub New(ByRef uid As Guid)
uid = _refuid
Debug.WriteLine(_refuid.ToString)
End Sub
Private Sub DoStuff()
End Sub
End Class
//OUTPUT
10001000-1000-1000-1000-100010001000
10001000-1000-1000-1000-100010001000
Hey Terry,
the crucial point is, I cant do it in the constructor. By "it" i mean
setting the value of the uid. Simply because I don't know it by the time the
constructor gets called.
It has to be done in the DoStuff() sub, which is called sometime after the
constructor.
In the real program, the work class is a Windows Form (or rather a subclass
of that).
The DoStuff sub is called after some user interaction. So you see my problem
is, that
I have to store the constructor paramter reference "uid" somehow, so that
dostuff can assign
it the desired value. In C/C++ I could just use a pointer variable to hold
the reference to the Guid
but I don't know how to do that in VB.NET. Perhaps I missed something but. In this example, the reference is passed
back via the constructor successfully.
//BUTTON
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
Dim g As Guid
Dim mc As New Work(g)
Debug.WriteLine(g.ToString)
End Sub
//CLASS
Public Class Work
Private _refuid As Guid = New Guid("10001000100010001000100010001000")
Public Sub New(ByRef uid As Guid)
uid = _refuid
Debug.WriteLine(_refuid.ToString)
End Sub
Private Sub DoStuff()
End Sub
End Class
//OUTPUT
10001000-1000-1000-1000-100010001000
10001000-1000-1000-1000-100010001000
But all an identifier is 'IS' a reference to an object. The only difference
between a value type and a reference type with VB.NET, is that the reference
type is stored on the heap, whereas a value type is stored on the stack.
Using an identifier in VB.NET is the same as d-referencing an object pointer
in C++
Dim a,b,c as Int
a= 5
b=a
c=b
a,b,c all are references to value types stored on the stack.
Does this help.?
--
OHM ( Terry Burns )
. . . One-Handed-Man . . .
If U Need My Email ,Ask Me
Time flies when you don't know what you're doing
"Jonas Pohlandt" <j.******************@dbit-systems.de> wrote in message
news:u8*************@tk2msftngp13.phx.gbl... Hey Terry,
the crucial point is, I cant do it in the constructor. By "it" i mean
setting the value of the uid. Simply because I don't know it by the time
the constructor gets called.
It has to be done in the DoStuff() sub, which is called sometime after the
constructor.
In the real program, the work class is a Windows Form (or rather a
subclass of that).
The DoStuff sub is called after some user interaction. So you see my
problem is, that
I have to store the constructor paramter reference "uid" somehow, so that
dostuff can assign
it the desired value. In C/C++ I could just use a pointer variable to hold
the reference to the Guid
but I don't know how to do that in VB.NET.
Perhaps I missed something but. In this example, the reference is passed
back via the constructor successfully.
//BUTTON
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
Dim g As Guid
Dim mc As New Work(g)
Debug.WriteLine(g.ToString)
End Sub
//CLASS
Public Class Work
Private _refuid As Guid = New
Guid("10001000100010001000100010001000")
Public Sub New(ByRef uid As Guid)
uid = _refuid
Debug.WriteLine(_refuid.ToString)
End Sub
Private Sub DoStuff()
End Sub
End Class
//OUTPUT
10001000-1000-1000-1000-100010001000
10001000-1000-1000-1000-100010001000
If you need to set a private member variable at any time you can set this
using a property,.
/Button
Dim mc As New Work
mc.RefUid = New Guid("00010001000100010001000100010001")
Debug.WriteLine(mc.RefUid.ToString())
//Class
Public Class Work
Private m_RefUid As New Guid
Public Sub New()
End Sub
Public Sub DoStuff(ByRef uid As Guid)
uid = RefUid
Debug.WriteLine(RefUid.ToString)
End Sub
Public Property RefUid() As Guid
Get
Return m_RefUid
End Get
Set(ByVal Value As Guid)
m_RefUid = Value
End Set
End Property
End Class
--
OHM ( Terry Burns )
. . . One-Handed-Man . . .
If U Need My Email ,Ask Me
Time flies when you don't know what you're doing
"Jonas Pohlandt" <j.******************@dbit-systems.de> wrote in message
news:u8*************@tk2msftngp13.phx.gbl... Hey Terry,
the crucial point is, I cant do it in the constructor. By "it" i mean
setting the value of the uid. Simply because I don't know it by the time
the constructor gets called.
It has to be done in the DoStuff() sub, which is called sometime after the
constructor.
In the real program, the work class is a Windows Form (or rather a
subclass of that).
The DoStuff sub is called after some user interaction. So you see my
problem is, that
I have to store the constructor paramter reference "uid" somehow, so that
dostuff can assign
it the desired value. In C/C++ I could just use a pointer variable to hold
the reference to the Guid
but I don't know how to do that in VB.NET.
Perhaps I missed something but. In this example, the reference is passed
back via the constructor successfully.
//BUTTON
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
Dim g As Guid
Dim mc As New Work(g)
Debug.WriteLine(g.ToString)
End Sub
//CLASS
Public Class Work
Private _refuid As Guid = New
Guid("10001000100010001000100010001000")
Public Sub New(ByRef uid As Guid)
uid = _refuid
Debug.WriteLine(_refuid.ToString)
End Sub
Private Sub DoStuff()
End Sub
End Class
//OUTPUT
10001000-1000-1000-1000-100010001000
10001000-1000-1000-1000-100010001000
Hey Terry,
thanks for staying with me. ;-)
I think we're still talking about different things. Lets try this approach:
How would you implement a windows form where you pass a reference to a Guid
in the construktor and then show it modal. Upon pressing a button (and not
before that), the variable we passed in initially is assigned a specific
value, like getting the uid out of a textbox where we typed it in earlier.
Like this
dim uid as Guid
dim frm as new myFormClass(uid)
dim dr as DialogResult = frm.ShowModal()
system.console.out.write(uid) 'uid holds now the desired value.
How would you do this?
Thanks, Jonas
On 23 Sep 2004 21:00:40 GMT, Jonas Pohlandt wrote: How would you implement a windows form where you pass a reference to a Guid
in the construktor and then show it modal. Upon pressing a button (and not
before that), the variable we passed in initially is assigned a specific
value, like getting the uid out of a textbox where we typed it in earlier.
One way would be to make a public readonly property in the dialog form and
then get that value when you close the form:
'** In the form class **
Private m_myGuid As Guid
Public ReadOnly Property MyGuid() As Guid
Get
Return m_myGuid
End Get
End Property
Private Sub Button1_Click(...) Handles Button1.Click
m_myGuid = Guid.NewGuid
End Sub
'** In the calling code
Dim uid as Guid
Dim frm As New myFormClass()
If frm.ShowDialog() = DialogResult.OK Then
uid = frm.MyGuid
End If
frm.Dispose
--
Chris
dunawayc[AT]sbcglobal_lunchmeat_[DOT]net
To send me an E-mail, remove the "[", "]", underscores ,lunchmeat, and
replace certain words in my E-Mail address.
I think I understand you now, but your thinking is still frimly wedged in
C++ Pointers.
You cannot do this in VB.NET.
You would need to pass this variable to the function being called so that it
can be set ( as can the private member of this class ). But this does not
sound like good OOP to me, it means you are working with a variable outside
the class.
--
OHM ( Terry Burns )
. . . One-Handed-Man . . .
If U Need My Email ,Ask Me
Time flies when you don't know what you're doing
"Jonas Pohlandt" <j.******************@dbit-systems.de> wrote in message
news:Xn**********************************@130.133. 1.4... Hey Terry,
thanks for staying with me. ;-)
I think we're still talking about different things. Lets try this
approach: How would you implement a windows form where you pass a reference to a
Guid in the construktor and then show it modal. Upon pressing a button (and not
before that), the variable we passed in initially is assigned a specific
value, like getting the uid out of a textbox where we typed it in earlier.
Like this
dim uid as Guid
dim frm as new myFormClass(uid)
dim dr as DialogResult = frm.ShowModal()
system.console.out.write(uid) 'uid holds now the desired value.
How would you do this?
Thanks, Jonas '** In the calling code
Dim uid as Guid
Dim frm As New myFormClass()
If frm.ShowDialog() = DialogResult.OK Then
uid = frm.MyGuid
End If
frm.Dispose
--
Chris
That's what I was looking for. I just assumed frm would have been disposed
allready by the time the line
uid = frm.MyGuid is reached. Thanks!
> I think I understand you now, but your thinking is still frimly wedged in C++ Pointers.
You cannot do this in VB.NET.
You would need to pass this variable to the function being called so that
it can be set ( as can the private member of this class ). But this does not
sound like good OOP to me, it means you are working with a variable
outside the class.
You are right, the design is flawed. I ended up subclassing DialogResult and
having the subclass include the Guid.
Thanks for taking time to think about this.
Your welcome, good luck in your future .NET experience.
--
OHM ( Terry Burns )
. . . One-Handed-Man . . .
If U Need My Email ,Ask Me
Time flies when you don't know what you're doing
"Jonas Pohlandt" <j.******************@dbit-systems.de> wrote in message
news:OA*************@TK2MSFTNGP11.phx.gbl... I think I understand you now, but your thinking is still frimly wedged
in C++ Pointers.
You cannot do this in VB.NET.
You would need to pass this variable to the function being called so
that it can be set ( as can the private member of this class ). But this does
not sound like good OOP to me, it means you are working with a variable
outside the class.
You are right, the design is flawed. I ended up subclassing DialogResult
and having the subclass include the Guid.
Thanks for taking time to think about this.
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