IViewObject

[Eric]

Hi,

How I get the interface IViewObject of a RichTextBox Control?
I would like to call the Draw Method with C#.

Thanks
Eric

[Wessel Troost]

> How I get the interface IViewObject of a RichTextBox Control?

I would like to call the Draw Method with C#.

IViewObject is a COM interface. You'd have to dive into Interop to
retrieve that. That road would probably starti with adding a reference to
the COM library called "Microsoft Rich Text Control".

Why not call the Refresh() method on the .NET RichTextBox?

Greetings,
Wessel

[Dmytro Lapshyn [MVP]]

Hi,

I'd rather conjure up a false PAINTSTRUCT and posted the WM_PAINT message to
the control (unless you have a managed way to ask the control to paint
itself). Messing with OLE interfaces would require good knowledge of the
underlying ActiveX control hosting stuff.

--
Sincerely,
Dmytro Lapshyn [Visual Developer - Visual C# MVP]
"Eric" <ju*@nospam.nospam> wrote in message
news:eR**************@TK2MSFTNGP15.phx.gbl...

Hi,

How I get the interface IViewObject of a RichTextBox Control?
I would like to call the Draw Method with C#.

Thanks
Eric

[Wessel Troost]

> I'd rather conjure up a false PAINTSTRUCT and posted the WM_PAINT

message to the control (unless you have a managed way to ask the control
to paint itself). Messing with OLE interfaces would require good
knowledge of the underlying ActiveX control hosting stuff.

Why not call Refresh() on the .NET control?

That will cause a WM_PAINT to be send.

Greetings,
Wessel

[Eric]

Thanks,
But reason to use the interface, is because I want to copy the RTF content
to a picture/bitmap.
For that I need to call the Draw Method of IViewObject.

Eric
"Wessel Troost" <no*****@like.the.sun> schrieb im Newsbeitrag
news:op.suew65e1f3yrl7@asbel...

How I get the interface IViewObject of a RichTextBox Control?
I would like to call the Draw Method with C#.

IViewObject is a COM interface. You'd have to dive into Interop to
retrieve that. That road would probably starti with adding a reference to
the COM library called "Microsoft Rich Text Control".

Why not call the Refresh() method on the .NET RichTextBox?

Greetings,
Wessel

[Wessel Troost]

> But reason to use the interface, is because I want to copy the RTF

content to a picture/bitmap.

This link shows how to capture the surface of a control and save it in a
bitmap:
http://www.bobpowell.net/capture.htm

You were probably looking to pass a bitmap DC to WM_PAINT. I don't know
if that's possible in .NET.

Greetings,
Wessel