finding opened window based on its handle ( C# )

[Daniel H.]

Hi! When I create a new form programatically , I can save its handle in a collection of some type
Later, I need to find that form based on a handle I saved and call one of its functions. The newly create
form can be a child of an MDI form but it very well may not be, so I can not use MDIChildren

I am wandering how it can be done in C#, please

Thank you in advance

Dany

[Niki Estner]

Use Control.FromHan dle.

Niki

"Daniel H." <an*******@disc ussions.microso ft.com> wrote in
news:4C******** *************** ***********@mic rosoft.com...

Hi! When I create a new form programatically , I can save its handle in a collection of some type. Later, I need to find that form based on a handle I saved and call one of its functions. The newly created form can be a child of an MDI form but it very well may not be, so I can not use MDIChildren.
I am wandering how it can be done in C#, please?

Thank you in advance,

Dany

[Daniel H.]

Hi! Thank you for answering my question.
I am having difficulty using this method though and docs+internet do no
provide any examples

I have a collection FormHash and I add page name and form handle

if (!AppConfig.For mHash.Contains( this.m_pageName )) AppConfig.FormH ash.Add(this.m_ pageName,this.H andle)

Ideally this should work

IntPtr myPtr = (System.IntPtr) AppConfig.FormH ash[this.m_pageName]
MainForm newForm2 =(MainForm) Control.FromHan dle(myPtr)
newForm2.Activa te()

However, the call bombs with the invalid cast error on MainForm newForm2 =(MainForm) Control.FromHan dle(myPtr)

What am I doing wrong? -- must be really stupid

Any help is greatly appreciated

Dan

----- Niki Estner wrote: ----

Use Control.FromHan dle

Nik

"Daniel H." <an*******@disc ussions.microso ft.com> wrote i
news:4C******** *************** ***********@mic rosoft.com..

Hi! When I create a new form programatically , I can save its handle in collection of some type Later, I need to find that form based on a handle I saved and call one o its functions. The newly create form can be a child of an MDI form but it very well may not be, so I ca

not use MDIChildren

I am wandering how it can be done in C#, please
Thank you in advance
Dan

[Niki Estner]

Don't know; Use the debugger and see if the handle is really the same, look
what control is returned by "FromHandle ".

BTW: Why do you store a handle (and not a reference to the main form) in the
first place?

Niki

"Daniel H." <an*******@disc ussions.microso ft.com> wrote in
news:BE******** *************** ***********@mic rosoft.com...

Hi! Thank you for answering my question.
I am having difficulty using this method though and docs+internet do not
provide any examples.

I have a collection FormHash and I add page name and form handle:

if (!AppConfig.For mHash.Contains( this.m_pageName )) AppConfig.FormH ash.Add(this.m_ pageName,this.H andle);
Ideally this should work:

IntPtr myPtr = (System.IntPtr) AppConfig.FormH ash[this.m_pageName];
MainForm newForm2 =(MainForm) Control.FromHan dle(myPtr);
newForm2.Activa te();

However, the call bombs with the invalid cast error on MainForm newForm2 =(MainForm) Control.FromHan dle(myPtr);
What am I doing wrong? -- must be really stupid.

Any help is greatly appreciated.

Dany

----- Niki Estner wrote: -----

Use Control.FromHan dle.

Niki

"Daniel H." <an*******@disc ussions.microso ft.com> wrote in
news:4C******** *************** ***********@mic rosoft.com...

> Hi! When I create a new form programatically , I can save its handle in a

collection of some type.

> Later, I need to find that form based on a handle I saved and call

one of its functions. The newly created

> form can be a child of an MDI form but it very well may not be, so

I can not use MDIChildren. >> I am wandering how it can be done in C#, please?
>> Thank you in advance,
>> Dany