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Re: Capturing Signatures in Compact Devices...

Ivo Salmre [MS]

3/14/2002 9:29:00 PM

Hi there,

Correct. The .NET Compact Framework will not support ActiveX controls in
forms. The reason for this for size/performance requirements for running on
devices.

A word on accessing headless COM objects: Threads in the .NET CF running on
Windows CE are "COM aware", in that they call CoInitialize() on thread
start-up and CoUninitialize() on thread shut down, so that if you call into
native code that accesses COM objects this will work fine. As noted above,
this does not imply that "embeddable" COM objects (ActiveX Controls) can be
hosted in forms (This would require the forms themselves to support a host
of COM interfaces).

So there are two ways of getting to the kind of functionality you refer to
below:
1. Create a native wrapper that interfaces with the headless COM objects
you need to use.
2. Use a .NET CF targeted 3rd party control that offers the
functionality you want. (We are working with 3rd party component developers
to get them building C# and VB.NET build components).


thanks, Ivo Salmre



"Ray Fink" <rkf@inel.gov> wrote in message
news:u750jeagr8p91@news.supernews.com...
> For the Pocket PC platform, you might also want to look at the EasyInk
> control, see Christian Forsberg's article on MSDN at
> http://www.microsoft.com/mobile/developer/technicalarticles/e...
> Odyssey Software (developers of the EasyInk control) also sell a product
> called ViaXML that handles transport layer, their website has an example
that
> might be what you're looking for if you can live without .NET
> http://www.odysseyso...
>
> If you want to use .NET, I've found that it gets more difficult. We're
> working on a Pocket PC application using .NET that needs some similar
> capabilities. It turns out there are a couple "gotchas" involved:
>
> 1. The .NET Compact Framework doesn't support COM Interop, which more or
less
> rules out an ActiveX control. (The Technology Preview release did not
support
> this, and the discussion I've seen suggests that it won't be in the beta
or
> final -- but I don't speak for Microsoft!)
>
> 2. For an ASP.NET solution delivered to the Pocket PC, the problem is how
to
> get the data from the ActiveX control back to the server. As far as I
could
> tell, Pocket IE won't do file uploads, and the ActiveX controls don't
expose
> methods/properties that Pocket IE JScript can deal with; byte arrays don't
> play well in JScript.
>
> I wound up developing a custom .NET control (compact framework) to do what
I
> wanted. I'd be interested in hearing how you come out on this.
>
> [trimmed the newsgroups to .dotnet only...]
>
> -- Ray
>
>
> In article <uTFVHYMuBHA.2012@tkmsftngp04>, "Dave Corun"
<davecorun@excite.com>
> wrote:
> >Thank you so much. ;)
> >
> >This is a very helpful article on writing it yourself.
> >http://www.devbuzz.com/content/zinc_evb_signature_captu...
> >
> >
> >
> >Also I found here is a company that sells a control that writes out a BMP
> >file of the signature.
> >
> >http://www.handdata.com/HDProducts/HDSignature/Signatu...
> >
> >
> >
> >All very interesting.
> >
> >// Dave
> >
> >"Chris Tacke, eMVP" <ctacke@applieddata.net> wrote in message
> >news:O3zcY4LuBHA.1672@tkmsftngp04...
> >There is a good article starting point at www.devbuzz.com for Signature
> >capture, but it doesn't cover .NET.
> >
> >-Chris
> >
> >
> >"Dave Corun" <davecorun@excite.com> wrote in message
> >news:OvCKr0LuBHA.2396@tkmsftngp05...
> >> I really want to be able to capture signatures in portable devices...
just
> >> like UPS does.
> >>
> >> Right now we're working w/ Qualcomm's system and we hate it so we've
> >decided
> >> to build something in house.
> >>
> >> We haven't purchased any devices yet, though we've been looking at the
> >> Compaq iPAQ 3800 series.
> >>
> >> We'd like this to be wireless so when our drivers enter the yard (we're
a
> >> transportation company) the data automatically is uploaded to our
servers,
> >> but this isn't a necessity.
> >>
> >> I'd really like to write this as a .NET application and run it on the
> >> compact framework. Whether its an ASP.NET app, or a Windows Form app
> >> doesn't matter either.
> >>
> >> Any pointers to how I would setup capturing signatures? Is there a
> >control
> >> available, either built-in or add-on, that would allow me to do this?
> >>
> >> Thx everyone!
> >>
> >> // Dave
> >>
> >>
> >
> >
> >
> >