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object address

I have a problem to pass an address of a control to a
function under C# .net 2003. The control is loaded on a
windows form, but the control is an OCX (COM component).
The function is in a C++ static dll (like an API
function),and the function expects a long (32 bit)
variable for an address. I could call it from VB 6 by
passing the control address using the VB's function
ObjPtr and it works fine. But in C#, you can't pass the
object name (reference) as its address,nor you
couldgetthe addressof it. Can anybody help me to find a
solution on it? Thanks.
Nov 15 '05 #1
2 3179

Try this

IntPtr pUnk = Marshal.GetIUnknownForObject( YourControl.GetOcx() );
// call external function here and pass in pUnk
Marshal.Release( pUnk );

Mattias

--
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/
Please reply only to the newsgroup.
Nov 15 '05 #2
Thanks Mattias!

It works fine. Thanks again.
-----Original Message-----

Try this

IntPtr pUnk = Marshal.GetIUnknownForObject( YourControl.GetOcx() );// call external function here and pass in pUnk
Marshal.Release( pUnk );

Mattias

--
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/
Please reply only to the newsgroup.
.

Nov 15 '05 #3

This thread has been closed and replies have been disabled. Please start a new discussion.

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