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How do I determine if an object is a COM object? I need to call Marshal.FinalReleaseComObject on all COM objects in an array of type Object.
Started by Jonathan Allen on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
Marshal.IsComObject
You can call GetType() and inspect the IsCOMObject property
typeof(myObject).IsCOMObject
or
instanceOfMyObject.GetType().IsCOMObject .
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I am bit unclear in using IUnknown interface .Is IUnknown interface only meant to work with COM /COM + Objects and some unmanaged codes like Win APIs ?
Answer Snippets (Read the full thread at stackoverflow):
COM interfaces are used primarily it as COM interfaces:
....
Its not used natively by .NET languages such as C# .
IUnknown is a COM/COM+ interface.
You should use IUnknown only for COM.
In context of C# and .NET - yes.
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We have a COM object implemented with C++/ATL that includes a method which will return a DIB. We are also writing a .NET application that will use this COM object. Since we are writing both, we have the liberty of deciding how best to return this DIB ...
Started by Karim on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
COM....
COM/OLE has a standard IPictureDisp ).
The idea is that the DIB is represented using a IntPtr .
Back from a DIB to a Bitmap.
This will also make your object compatible with other COM clients like VB6.
To the calling program.
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I recently ran into a problem with a COM object that was using a singleton class factory and had members that were pointers to other COM objects implemented in a different dll than the singleton object. These other COM objects were created by the singleton...
Started by Will Gorman on
, 5 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
If a COM object hasn't been released, then the DLL in which release the ....
If you have a pointer (also known as 'hold a reference') to a COM object, then that COM object shouldn't disappear until you release it.
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I have rephrased this question.
When .net objects are exposed to COM Clients through COM iterop, a CCW ( COM Callable Wrapper ) is created, this sits between the COM Client and the Managed .net object.
In the COM world, objects keep a count of the number...
Started by Binary Worrier on
, 9 posts
by 9 people.
Answer Snippets (Read the full thread at stackoverflow):
My understanding is that will allow you control over creating the COM create instance of your real legacy object, and delegate all calls from MyClass to this instance not mean that the object....
Are exposing as a com object).
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A bit of an odd question and probably backwards from what most people want to do, but I'm trying to work around a legacy COM issue.
I have two components, both of which are actually .NET assemblies, but for historical reasons one is loading the other ...
Started by Tim Long on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
How exactly, you're using the one .Net assembly within the other, via COM? That's my very problem- VS.
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I have a COM object that I'm trying to use from C++ (not .NET), and all of the example programs and manual are written assuming the use of C#.NET or VB.NET. COM is new to me so I'm a bit overwhelmed. I'm using #import on the TLB but am struggling to deal...
Started by bdk on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
Be in for some hurt if you try to use COM without understanding it (and you may want a book which.
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I have a VB6 dll that is trying to create a COM object using the following line of code:
Set CreateObj = CreateObject("OPSValuer.OPSValue")
However this fails with the error "Object variable or With block variable not set".
I can see OPSValuer.OPSValue...
Started by Phillip Wells on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
Is this a local DCom object or something running on another tier.
Program Files\Microsoft Visual Studio 8\Common7\Tools\Bin
The error may be thrown within the object in the constructor you will get that error.
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I Use Jacob (JAVA COM Bridge) on a 64 Bit Machine and want to load a COM Objects from a 32 bit DLL. How can I do that?
Started by Hannes de Jager on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
So either your entire app will have to run 32bit or youll need to place the COM object in something like COM+ and use cross process) that serves as a factory....
You will need to host the 32 bit COM object in a 32bit process.
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I am using COM Object in my C# .NET 1.1 application. When the COM object is not registered on client machine, I get the exception:
"COM object with CLSID {} is either not valid or not registered." (HRESULT:0x80040154)
I know how to register the COM object...
Started by NEDian on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
For now windows doesn't ....
The message "I don't know how to find the COM object for this GUID" and want to do it better..? In other words: Usually you'd register the COM object and it is referenced by its class id or ProgId.
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