Re: IDispatch* to COMPtr

Thomas

There are many ways to obtain an IDispatch* from some native source.
However, the specifics of it depend largely on your environment.

You say your IDispatch* pointer is pointing to a HTMLDocument of an
embedded Internet Explorer instance. Where is this object residing? Is
it in an in-process DLL? An out-of-process automation server? An
in-process ActiveX object?

Either way, your C++ app will need to expose the COM interface (with a
method returning IDispatch* in your application's type library)
programmatically. Using Visual Studio .Net you can do this fairly easily
and there are tutorials on how to write DLLs and automation servers that
you can instantiate directly using VB or Jawin.

Be careful of multithreading issues when you are sharing COM objects
across process boundaries. When you create your IEXPLORE.EXE instance
(your out-of-process, embedded IE instance) you need to specify in your
C++ code that it should be multi-threaded, on BOTH JAVA AND C++. I hope
you aren't accessing this interface more than once every 2 or 3 seconds
(and hopefully less frequently than that!) or the synchronization done
by COM, combined with JNI, is going to kill application performance. But
anyway, here's how to do it:

http://jawinproject.sourceforge.net/jawinarchitecture.html#comThreading

That's for Jawin, and

http://msdn.microsoft.com/library/default.asp?url=3D/library/en-us/com/ht=
m
l/ffb79c0f-aeda-4ea1-aea8-afb79109837f.asp

That's for C++. Use Multithreaded Apartments from both Jawin and C++.

While I'm at it, I'll tell you one more thing -- when Jawin is using
MTA, I've found that even very meticulous Java code, that calls .close()
on all COMPtrs, doesn't always reduce the reference count on your
out-of-process EXE in a way that it terminates itself. But I had this
problem with Office apps -- maybe IEXPLORE is more cooperative ;)

Need any other help? What part of the code are you stuck on? The C++
code to expose your IDispatch*, or the Jawin code to call it?

Sean

-----Original Message-----
From: Discussion of Java/Win32/COM integration with Jawin
[mailto:[email protected]] On Behalf Of Thomas Max
Sent: Monday, June 19, 2006 8:06 AM
To: [email protected]
Subject: [JAWIN] IDispatch* to COMPtr

Is there a way to access an IDispatch* (of IHTMLDocument) through JAWIN
in
Java.
Description :

I wan't to pass a IDispatch* Pointer (which is pointing to a
HTMLDocument of
an embedded Internet Explorer instance in C++) to my Java App.
I successfully created the interface classes for the IHTMLDocument with
the
JAWIN-typebrowser and compiled them.

But i don't know how to wrap the IDispatch* on C++ side to an JAWIN
ComPtr
on Java Side.

Could anyone help me please ?