.NET (Core and Framework)

27-Jan-04 22:04

I'm developing a .NET based DLL (in VB.NET) which exposes a COM class for an old system which only supports COM/ActiveX.
So I'm basicly calling my new .NET COM class from an old VB6 based application.

One of the methods in my .NET based COM class takes a HWND handle (long) which is used as the parent handle for a form which my DLL creates and displays.

But how do I set the parent handle to my .NET Windows form ?

The form is displayed with the Show method (modeless).

Serge Lobko-Lobanovsky27-Jan-04 22:35

27-Jan-04 22:35

let me ask why do you need to pass a HWND?
i am not sure if it is possible.

Regards,
Serge (Logic Software)

MrBean27-Jan-04 22:39

27-Jan-04 22:39

Because the old system that will use my .NET component and form, only supports a win32 HWND...

Serge Lobko-Lobanovsky27-Jan-04 23:10

27-Jan-04 23:10

i mean, why do u need a parent HWND, for what purpose?

Regards,
Serge (Logic Software)

MrBean27-Jan-04 23:45

27-Jan-04 23:45

My .NET form need the HWND handle because it's an child form within another application.

Serge Lobko-Lobanovsky28-Jan-04 0:13

28-Jan-04 0:13

are you talking about MDI children?

Regards,
Serge (Logic Software)

MrBean28-Jan-04 0:41

28-Jan-04 0:41

If you are not able to help, please do not post relys or irrelevant questions in this thread - thank you !

Duncan Edwards Jones28-Jan-04 2:40

Duncan Edwards Jones

28-Jan-04 2:40

System.Windows.Forms.Form.Handle

Property Value
An IntPtr that contains the window handle (HWND) of the control. (or form)

'--8<------------------------
Ex Datis:
Duncan Jones
Merrion Computing Ltd

MrBean28-Jan-04 2:44

28-Jan-04 2:44

Yes... but that's a READ-ONLY property !

Duncan Edwards Jones28-Jan-04 3:01

Duncan Edwards Jones

28-Jan-04 3:01

Yes - well, the window handle is assigned by the operating system when the window is created.

'--8<------------------------
Ex Datis:
Duncan Jones
Merrion Computing Ltd

MrBean28-Jan-04 3:05

28-Jan-04 3:05

Dude, please read my question again... I want to set the *parent* handle.

Not read the Window handle of my form...

Duncan Edwards Jones28-Jan-04 5:23

Duncan Edwards Jones

28-Jan-04 5:23

Then you will need the SetParent API call...and pass it the handle you get as per the earlier post.

'--8<------------------------
Ex Datis:
Duncan Jones
Merrion Computing Ltd

MrBean29-Jan-04 0:36

29-Jan-04 0:36

I have tried the SetParent API function but without luck ;(
The form is created but the parent-child relationship is not set somehow.

Both this...

m_MyForm = new MyForm
SetParent(m_MyForm.Handle.ToInt32, m_ParentHandle)
m_MyForm.Show()

...and...

m_MyForm = new MyForm
m_MyForm.Show()
SetParent(m_MyForm.Handle.ToInt32, m_ParentHandle)

...doesn't work... something else I need to call or set ?

Serge Lobko-Lobanovsky28-Jan-04 2:56

28-Jan-04 2:56

MrBean wrote:
If you are not able to help, please do not post relys or irrelevant questions

man, i AM trying to figure out what you wanna accomplish. sorry if i bothered u with my "irrelevant" questions. if you want a .NET form to set its Owner to a not .NET form - the answer is you can't.
if you want a .NET form to become an MDI child of a .NET form - the answer is tou can't.

what i was trying to understand is for what purpose you need it so that i can judge if it is at least possible. you need to provide more info.

Regards,
Serge (Logic Software)

MrBean28-Jan-04 3:15

28-Jan-04 3:15

So in short (regardless if it's a MDI child or not)... I can't ;(

I think I have given enough info... but can can try to write it different Smile | :)

I'm making a .NET DLL which contains a single Windows Form. This form is used by an VB6 based application thru COM.

The VB6-based application then use my DLL/form by calling a few standard methods and setting the form size, parent handle and such. It's the application way of supporting plug-ins.
The plug-ins are shown as kind of controls on a form but not as a MDI form or ActiveX control - it's a kind of embedded form.
This works today but only with VB6 DLLs (COM) and VB6 forms.

So I basicly need to make a plug-in for the application but this time in .NET...

Serge Lobko-Lobanovsky28-Jan-04 3:46

28-Jan-04 3:46

Ok, now I see your problem.

I am afraid you won't be able to implement it this way because of the different nature of forms in .NET and VB6.

One solution that I can think of now is to implement your plugin DLL without a form, and create another DLL in Vb6 that will consume your plugin DLL methods, while providing a form for your application to show it as usual.

hope that makes some sense Smile | :)

Regards,
Serge (Logic Software)

Creating your own datatypes?

James Simpson3-Feb-04 6:29

James Simpson

3-Feb-04 6:29

Have I got this correct:

HWND passed into .NET Object to be displayed as a child of a .NET form in the DLL?

Look into NativeWindow.FromHandle or Control.FromHandle. This should give you a .NET object from the handle and expose some more functionality.

If you just want to display the HWND as a child of a Form created in .NET you can use a windows UI function from User32, SetWindowParent will be able to reparent the child form as a child of your .NET form.

J

James Simpson
Web Developer
imebgo@hotmail.com

P S - This is what part of the alphabet would look like if Q and R were eliminated
Mitch Hedberg

FruitBatInShades27-Jan-04 8:10

FruitBatInShades

27-Jan-04 8:10

Is it possible to create your own datatypes in .Net. If so, how. I have a need to create some new data types but want to be able to convert them as required. I will need to implement .Empty and the interfaces that allow me to cast them.

IntStrPair
  Int as Int32
  Str as String
  Property IsEmpty
End Type

Ctype(IntStrPair, Integer) = Int Value
Ctype(IntStrPair, String) = Str Value

The obvious way is to just create a class or structure but I wondered whether it is possible to actually create datatypes? Any ideas of how to implement this would be greatly appreciated.

Using managed DirectX in .NET

Serge Lobko-Lobanovsky27-Jan-04 6:42