passing parameters between forms

[Jan Warning]

How do I pass an argument from one form to another?
I do the following:
FormA:
dim strFilename as string ="Filename"
dim frmLayout1 as New frmLayout(strFi lename)
frmLayout1.Show ()

frmLayout:
Private strFilename as string
..
..
Sub New(Filename as string)
..
..strFilename = Filename
..
..
Private Sub frmLayout_Load( ...)
dim strLayout as new Filestream(strF ilename, FileMode.Open)

At this point I get an error because strFilename is empty (Nothing)

When I step thru the code, I can see that the parm is correctly passed to
and stored by the Sub New
What am I doing wrong?

[dotnetnewbie]

RE: passing parameters between forms

You could either use a property (in a Module) and access the value there
(from any form) or

In Form A:

Private sub OpenNewForm()
Dim strValue as string
Dim frm as FormB
frm.GetDetails( strValue)
frm = nothing
End Sub


In Form B

Private mstrValue as string

Public Sub GetDetails(byva l vstrValue as string)
mstrValue = vstrValue
me.show
end sub

Gerry

"Jan Warning" wrote:
[color=blue]
> How do I pass an argument from one form to another?
> I do the following:
> FormA:
> dim strFilename as string ="Filename"
> dim frmLayout1 as New frmLayout(strFi lename)
> frmLayout1.Show ()
>
> frmLayout:
> Private strFilename as string
> ..
> ..
> Sub New(Filename as string)
> ..
> ..strFilename = Filename
> ..
> ..
> Private Sub frmLayout_Load( ...)
> dim strLayout as new Filestream(strF ilename, FileMode.Open)
>
> At this point I get an error because strFilename is empty (Nothing)
>
> When I step thru the code, I can see that the parm is correctly passed to
> and stored by the Sub New
> What am I doing wrong?
>
>
>
>[/color]

[dotnetnewbie]

RE: passing parameters between forms

Correction to my last post

Dim frm as FormB

should have read

Dim frm as New FormB

Gerry


"Jan Warning" wrote:
[color=blue]
> How do I pass an argument from one form to another?
> I do the following:
> FormA:
> dim strFilename as string ="Filename"
> dim frmLayout1 as New frmLayout(strFi lename)
> frmLayout1.Show ()
>
> frmLayout:
> Private strFilename as string
> ..
> ..
> Sub New(Filename as string)
> ..
> ..strFilename = Filename
> ..
> ..
> Private Sub frmLayout_Load( ...)
> dim strLayout as new Filestream(strF ilename, FileMode.Open)
>
> At this point I get an error because strFilename is empty (Nothing)
>
> When I step thru the code, I can see that the parm is correctly passed to
> and stored by the Sub New
> What am I doing wrong?
>
>
>
>[/color]

[Jan Warning]

Re: passing parameters between forms

I tried it (I noticed your mistake) and it worked. Thanks a lot.
But I am still wondering why my original code did not work.

Regards, Jan Warning
"dotnetnewb ie" <dotnetnewbie@d iscussions.micr osoft.com> wrote in message
news:5B37507D-3D82-4515-8893-E509D2A82D07@mi crosoft.com...[color=blue]
> Correction to my last post
>
> Dim frm as FormB
>
> should have read
>
> Dim frm as New FormB
>
> Gerry
>
>
> "Jan Warning" wrote:
>[color=green]
>> How do I pass an argument from one form to another?
>> I do the following:
>> FormA:
>> dim strFilename as string ="Filename"
>> dim frmLayout1 as New frmLayout(strFi lename)
>> frmLayout1.Show ()
>>
>> frmLayout:
>> Private strFilename as string
>> ..
>> ..
>> Sub New(Filename as string)
>> ..
>> ..strFilename = Filename
>> ..
>> ..
>> Private Sub frmLayout_Load( ...)
>> dim strLayout as new Filestream(strF ilename, FileMode.Open)
>>
>> At this point I get an error because strFilename is empty (Nothing)
>>
>> When I step thru the code, I can see that the parm is correctly passed to
>> and stored by the Sub New
>> What am I doing wrong?
>>
>>
>>
>>[/color][/color]

[Zoury]

Re: passing parameters between forms

Yeah.. Your original would have been better... Was it the real code
(copy/paste) ? If so can you reproduce this behavior in a new project ?

--
Best Regards
Yanick
"Jan Warning" <jan.warning@wa nadoo.nl> a écrit dans le message de
news:OnAuJ0GaFH A.720@TK2MSFTNG P15.phx.gbl...[color=blue]
> I tried it (I noticed your mistake) and it worked. Thanks a lot.
> But I am still wondering why my original code did not work.
>
> Regards, Jan Warning
> "dotnetnewb ie" <dotnetnewbie@d iscussions.micr osoft.com> wrote in message
> news:5B37507D-3D82-4515-8893-E509D2A82D07@mi crosoft.com...[color=green]
> > Correction to my last post
> >
> > Dim frm as FormB
> >
> > should have read
> >
> > Dim frm as New FormB
> >
> > Gerry
> >
> >
> > "Jan Warning" wrote:
> >[color=darkred]
> >> How do I pass an argument from one form to another?
> >> I do the following:
> >> FormA:
> >> dim strFilename as string ="Filename"
> >> dim frmLayout1 as New frmLayout(strFi lename)
> >> frmLayout1.Show ()
> >>
> >> frmLayout:
> >> Private strFilename as string
> >> ..
> >> ..
> >> Sub New(Filename as string)
> >> ..
> >> ..strFilename = Filename
> >> ..
> >> ..
> >> Private Sub frmLayout_Load( ...)
> >> dim strLayout as new Filestream(strF ilename, FileMode.Open)
> >>
> >> At this point I get an error because strFilename is empty (Nothing)
> >>
> >> When I step thru the code, I can see that the parm is correctly passed[/color][/color][/color]
to[color=blue][color=green][color=darkred]
> >> and stored by the Sub New
> >> What am I doing wrong?
> >>
> >>
> >>
> >>[/color][/color]
>
>[/color]

[Jan Warning]

Re: passing parameters between forms

It had to replace a defective harddisk, so I could not reply any sooner.

I could reproduce this behavior in a small new project.
I also discobvered wahat I did wrong, although I still don't quite
understand it.

I passed the parameter from FormA to FormB as follows:
Private Parm as string
dim myFormb as New FormB(Parm)
FormB.Show

In FormB:
Private Filename as string
..

Public Sub New(byval Filename as string)
Filename = Filename
etc.

Public Sub Form2_Load .....
xxxx = Filename

Now filename appears to be empty (Nothing)

when I change the code to"
Private myFilename as string
..

Public Sub New(byval Filename as string)
myFilename = Filename
etc.

Public Sub Form2_Load .....
xxxx = myFilename

then everything is fine.

as I said, I don't quite understand, but it works.

Best regards, Jan Warning

"Zoury" <yanick_lefebvr e at hotmail dot com> wrote in message
news:ugc%23h%23 GaFHA.2128@TK2M SFTNGP14.phx.gb l...[color=blue]
> Yeah.. Your original would have been better... Was it the real code
> (copy/paste) ? If so can you reproduce this behavior in a new project ?
>
> --
> Best Regards
> Yanick
> "Jan Warning" <jan.warning@wa nadoo.nl> a écrit dans le message de
> news:OnAuJ0GaFH A.720@TK2MSFTNG P15.phx.gbl...[color=green]
>> I tried it (I noticed your mistake) and it worked. Thanks a lot.
>> But I am still wondering why my original code did not work.
>>
>> Regards, Jan Warning
>> "dotnetnewb ie" <dotnetnewbie@d iscussions.micr osoft.com> wrote in message
>> news:5B37507D-3D82-4515-8893-E509D2A82D07@mi crosoft.com...[color=darkred]
>> > Correction to my last post
>> >
>> > Dim frm as FormB
>> >
>> > should have read
>> >
>> > Dim frm as New FormB
>> >
>> > Gerry
>> >
>> >
>> > "Jan Warning" wrote:
>> >
>> >> How do I pass an argument from one form to another?
>> >> I do the following:
>> >> FormA:
>> >> dim strFilename as string ="Filename"
>> >> dim frmLayout1 as New frmLayout(strFi lename)
>> >> frmLayout1.Show ()
>> >>
>> >> frmLayout:
>> >> Private strFilename as string
>> >> ..
>> >> ..
>> >> Sub New(Filename as string)
>> >> ..
>> >> ..strFilename = Filename
>> >> ..
>> >> ..
>> >> Private Sub frmLayout_Load( ...)
>> >> dim strLayout as new Filestream(strF ilename, FileMode.Open)
>> >>
>> >> At this point I get an error because strFilename is empty (Nothing)
>> >>
>> >> When I step thru the code, I can see that the parm is correctly passed[/color][/color]
> to[color=green][color=darkred]
>> >> and stored by the Sub New
>> >> What am I doing wrong?
>> >>
>> >>
>> >>
>> >>[/color]
>>
>>[/color]
>
>[/color]

[Armin Zingler]

Re: passing parameters between forms


"Jan Warning" <jan.warning@wa nadoo.nl> schrieb im Newsbeitrag
news:elNIqp6aFH A.720@TK2MSFTNG P15.phx.gbl...[color=blue]
> It had to replace a defective harddisk, so I could not reply any sooner.
>
> I could reproduce this behavior in a small new project.
> I also discobvered wahat I did wrong, although I still don't quite
> understand it.
>
> I passed the parameter from FormA to FormB as follows:
> Private Parm as string
> dim myFormb as New FormB(Parm)
> FormB.Show
>
> In FormB:
> Private Filename as string
> .
>
> Public Sub New(byval Filename as string)
> Filename = Filename
> etc.[/color]


Names are resolved inside out. "Filename = Filename" assigns the argument to
the argument, i.e. it changes nothing. To change the field of the Form,
write

me.filename = filename

[color=blue]
> Public Sub Form2_Load .....
> xxxx = Filename
>
> Now filename appears to be empty (Nothing)
>
> when I change the code to"
> Private myFilename as string
> .
>
> Public Sub New(byval Filename as string)
> myFilename = Filename
> etc.
>
> Public Sub Form2_Load .....
> xxxx = myFilename
>
> then everything is fine.
>
> as I said, I don't quite understand, but it works.[/color]


"myfilename = " accesses the field of the Form because there is no local
variable with the name "myfilename "

Armin