Instance of Windows::Form

[Michael Zeile]

hi there,

i have the following problem:

i have 2 normal Windows Forms classes, declared as:

public __gc class MainForm : public System::Windows ::Forms::Form
and
public __gc class FormLayout : public System::Windows ::Forms::Form

my application starts like this:

....
MainForm *myform;
myform = new MainForm();
System::Threadi ng::Thread::Cur rentThread->ApartmentSta te =
System::Threadi ng::ApartmentSt ate::STA;
Application::Ru n(myform);
....

somewhere in my MainForm class, i have the following code:
....
FormLayout *formLayout;
formLayout = new FormLayout();
formLayout->Show();
formLayout->InitGL();
....etc...

now my problem: i want to send status messages or change the behavior of
my MainForm window by pressing a key in my FormLayout form, but i can't
because i don't know the instance of my MainForm ... because __gc
objects can't be declared global. so how do i get the instance of my
form generated by Application::Ru n() ?

any suggestions ?

thx a LOT...

bye
michael

[Morten Overgaard]

Re: Instance of Windows::Form

try the gcroot<managedC lass*> class template. This makes it possible to
declare __gc classes global

/Morten

"Michael Zeile" <bofh@primusnet z.de> wrote in message
news:bob5ls$fn7 $03$1@news.t-online.com...[color=blue]
> hi there,
>
> i have the following problem:
>
> i have 2 normal Windows Forms classes, declared as:
>
> public __gc class MainForm : public System::Windows ::Forms::Form
> and
> public __gc class FormLayout : public System::Windows ::Forms::Form
>
> my application starts like this:
>
> ...
> MainForm *myform;
> myform = new MainForm();
> System::Threadi ng::Thread::Cur rentThread->ApartmentSta te =
> System::Threadi ng::ApartmentSt ate::STA;
> Application::Ru n(myform);
> ...
>
> somewhere in my MainForm class, i have the following code:
> ...
> FormLayout *formLayout;
> formLayout = new FormLayout();
> formLayout->Show();
> formLayout->InitGL();
> ...etc...
>
> now my problem: i want to send status messages or change the behavior of
> my MainForm window by pressing a key in my FormLayout form, but i can't
> because i don't know the instance of my MainForm ... because __gc
> objects can't be declared global. so how do i get the instance of my
> form generated by Application::Ru n() ?
>
> any suggestions ?
>
> thx a LOT...
>
> bye
> michael
>[/color]

[TGF]

Re: Instance of Windows::Form

You could also force the constructor to take a System::Object gc* parameter
and call the layout form as such...

FormLayout *formLayout;
formLayout = new FormLayout(this ); // where 'this' is the MainForm class
instance


.....then in the FormLayout class, declare a member as "System::Ob ject gc*
parentMember". Then you can save the memory address of the parent class in
your FormLayout constructor....

FormLayout (System::Object __gc *parent)
{
parentMember = parent;
}

....Then whenever you have to call a function in the parent, you can do this
(Make sure you put the #include "MainForm.h " in the FormLayout.cpp file...

MainForm *mf = dynamic_cast<Ma inForm *>(parentMember );

// check for valid ptr to parent before referencing
if (mf) {

mf->SomeFunction(s omeParementer);

}

Hope this helps.....

-TGF





"Michael Zeile" <bofh@primusnet z.de> wrote in message
news:bob5ls$fn7 $03$1@news.t-online.com...[color=blue]
> hi there,
>
> i have the following problem:
>
> i have 2 normal Windows Forms classes, declared as:
>
> public __gc class MainForm : public System::Windows ::Forms::Form
> and
> public __gc class FormLayout : public System::Windows ::Forms::Form
>
> my application starts like this:
>
> ...
> MainForm *myform;
> myform = new MainForm();
> System::Threadi ng::Thread::Cur rentThread->ApartmentSta te =
> System::Threadi ng::ApartmentSt ate::STA;
> Application::Ru n(myform);
> ...
>
> somewhere in my MainForm class, i have the following code:
> ...
> FormLayout *formLayout;
> formLayout = new FormLayout();
> formLayout->Show();
> formLayout->InitGL();
> ...etc...
>
> now my problem: i want to send status messages or change the behavior of
> my MainForm window by pressing a key in my FormLayout form, but i can't
> because i don't know the instance of my MainForm ... because __gc
> objects can't be declared global. so how do i get the instance of my
> form generated by Application::Ru n() ?
>
> any suggestions ?
>
> thx a LOT...
>
> bye
> michael
>[/color]