Component needs a form's HWND

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

mikesnoise@gmail.com - 14 Feb 2007 19:18 GMT

I am writing a class derived from Component that calls a Win32
function to display a dialog box. The Win32 function takes an HWND as
the parent window of the dialog box (for positioning the dialog over
the parent). How do I get the HWND of the form that it was dropped on?

Thanks,
-Mike-

Reply to this Message

ClayB - 14 Feb 2007 19:54 GMT

Try using

IntPtr HWND = this.Handle; //this refers to the Form.

to see if this is what you need.

=============
Clay Burch
Syncfusion, Inc.

Reply to this Message

mikesnoise@gmail.com - 14 Feb 2007 20:08 GMT

> Try using
>
[quoted text clipped - 5 lines]
> Clay Burch
> Syncfusion, Inc.

I'm writing a class derived from Component. I want it to be able to
figure out the form's handle. The this keyword would be the Component,
not the form. In other words I don't want to expose a property to
specify the HWND -- I want this to be automatic like the
FileOpenDialog component.

-Mike-

Reply to this Message

Jeff Gaines - 14 Feb 2007 22:36 GMT

On 14/02/2007 in message
<1171483703.050238.145150@l53g2000cwa.googlegroups.com>

>>Try using
>>
[quoted text clipped - 13 lines]
>
>-Mike-

In cases like this I use a constructor that takes the parent form as a
parameter.

Signature

Jeff Gaines

Reply to this Message

mikesnoise@gmail.com - 14 Feb 2007 22:49 GMT

On Feb 14, 2:36 pm, "Jeff Gaines" <whitedra...@newsgroups.nospam>
wrote:

> On 14/02/2007 in message
> <1171483703.050238.145...@l53g2000cwa.googlegroups.com>
[quoted text clipped - 23 lines]
> --
> Jeff Gaines

Yeah, I could do that. But I'm really trying to emulate the
System.Windows.Forms.OpenFileDialog (I mistakenly called it the
FileOpenDialog component in a previous post). I looked in the
documentation and found that FileOpenDialog has two overloads of
ShowDialog: ShowDialog() and ShowDialog(IWin32Window). I guess
ShowDialog() probably calls GetOpenFileName() with a NULL owner HWND
while ShowDialog(IWin32Window) provides the parameter's HWND. I always
assumed that somehow the component was able to get the HWND of the
containing form. Does anyone know if ShowDialog() does any trick to
get the HWND or if it just passes NULL?

Thanks for all your help!
-Mike-

Reply to this Message

Stoitcho Goutsev (100) - 19 Feb 2007 16:34 GMT

Mike,

Common dialogs use GetActiveWindow API if parent window is not provided.

Signature

HTH
Stoitcho Goutsev (100)

> On Feb 14, 2:36 pm, "Jeff Gaines" <whitedra...@newsgroups.nospam>
> wrote:
[quoted text clipped - 39 lines]
> Thanks for all your help!
> -Mike-

Reply to this Message

Rate this thread:

Component needs a form's HWND

Free Magazines