Subtle crashes [modified]

[Rama Krishna Vavilala]

Original code:

[ComVisible(true)]
[Guid(".....")]
interface IDocument
{
public void Method1();

public Property1 { get; }
}

Note:- a valid Guid was supplied. After some months:

[ComVisible(true)]
[Guid(".....")]
interface IDocument
{
public Property1 { get; }

public void Method1();
}

VSS Comments: Changed the member order to conform to coding standards. The second code breaks lot of existing clients. Can anyone tell me why?:)

modified on Saturday, March 21, 2009 9:20 AM

[dighn]

same interface, v-table entries got shifted, and clients weren't recompiled?

[Rama Krishna Vavilala]

Yes. I am glad that someone still remembers COM concepts:) While in .NET method and interface binding is via name for COM clients it's via vtable so all native clients which used COM interface crashed.

[PIEBALDconsult]

COM sucketh, don't use it.

[Electron Shepherd]

PIEBALDconsult wrote:

COM sucketh, don't use it.

Or just follow the COM rules, one of which is "if you change the interface in any way, change it's UUID as well".

Server and Network Monitoring

[Ed Poore]

Rama Krishna Vavilala wrote:

interfact

Surprised it compiled at all...

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I doubt it. If it isn't intuitive then we need to fix it. - Chris Maunder

[Rama Krishna Vavilala]

It's a new keyword in C# 4.0 ;)

[Stephen Hewitt]

Large chunks on the OS are exposed using COM. For many jobs COM is the way to go, regardless of the language used. COM does not "sucketh".

Steve

[peterchen]

vtable binding. :doh:

Don't attribute to stupidity what can be equally well explained by buerocracy.
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[Luc Pattyn]

:confused:

Luc Pattyn [Forum Guidelines] [My Articles]

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[Dan Neely]

Writing non trivial office plugins in VBA sucketh worse. COM is a much better alternative.

Today's lesson is brought to you by the word "niggardly". Remember kids, don't attribute to racism what can be explained by Scandinavian language roots. -- Robert Royall

[Gary R Wheeler]

COM does indeed sucketh, but sinceth it's the only game in town for certain things, get used to the vacuum.

Software Zen: delete this;
Fold With Us![^]