Answer Posted / krishna akkulu

Structs, also known as User Defined Types (UDTs), can be
used in Automation- compatible interfaces
An Automation- compatible struct may contain only primitive
Automation types as its members.

Nesting structs is not allowed, but VARIANT is allowed thus
enabling nested structs (you can store a struct in a
VARIANT).

In order for a struct to be usable for Automation-
compatible interfaces, the struct must be described in a
type library and it must be declared with its own GUID:

[uuid(21602F40-CC62-11d4-AA2B-00A0CC39CFE0)]
struct MyStruct
{
[helpstring("A long value")]
long nLongValue;

[helpstring("A string")]
BSTR bstrStringValue;
};

// Later in the IDL file
[uuid(...), version(...), helpstring(...)]
library MyLib
{
...
struct MyStruct;
};
For more info see : http://vcfaq.mvps.org/com/4.htm

Once I have developed the com wrapper do I have to still register the com in registry?

839

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Which namespace do the classes, allowing you to support COM functionality, are located?

2305

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how to call a dll as a COM dll?

895

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How to create an instance of the object in COM?

739

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Define and explain about COM?

800

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Does .net replace com?

719

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Can I use com components from .net programs?

788

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Is dcom dead?

789

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Suppose we have object B and aggregated object C (in- proc server), created by B. Can you access any interface of B from C?

759

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What is dcom?

695

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How do we create dcom object in vb6?

870

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What is reference counting in com?

714

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Can I use .net components from com programs?

765

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Can you explain what is dcom?

686

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What is the use of com component in .net?

757

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