By Juval Löwy
This publication discusses COM+ part prone. each one provider is
covered in its personal bankruptcy, and every bankruptcy discusses a similar
range of concerns: the matter the carrier addresses, possible
solut ions to that challenge, an in-depth description of the COM+
solut ion, tradeoffs, layout, and implementat ion guidance, tips, and
known pit falls. i've got t ried to supply worthy layout informat ion and
lessons I discovered whereas using COM+. I additionally descr ibe COM+ helper
classes and ut ilit ies I built that might increase your productivity
significantly. (The COM+ occasions helper items and the COM+
Logbook are major examples.) This e-book specializes in the «how to»—
that is, it presents useful info. you might want to learn the
chapters so as , considering that so much chapters depend upon info discussed
in the previous chapters. The booklet additionally goals to provide an explanation for COM+ step
by step. A software program engineer already conversant in COM who wants
to comprehend what COM+ is and the way to exploit it will possibly learn this ebook and
star t constructing COM+ purposes instantly.
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Additional info for COM and .NET Component Services
The classic COM m echanism s for m anually m ar shaling int erface point ers acr oss apart m ent boundaries hav e been m ade cont ex t- aware. They are what you should use t o m ar shal int erface point ers m anually across cont ext boundar ies w it h COM+ . Generally , t hese m echanism s rely on t he CoMarshalInterface( ) and CoUnmarshalInterface( ) funct ions. When y ou need t o m anually m arshal an int erface point er fr om Cont ex t A t o Cont ex t B, you would serialize t he int erface point er int o a st r eam in Cont ext A using CoMarshalInterface( ), and get it out of t he st r eam using CoUnmarshalInterface( ) in Cont ext B.
Record t he process I D for t he Hello COM+ applicat ion. Nex t , bring up Windows Task Manager and locat e t he pr ocess wit h a m at ching I D. ex e. Figu re 1 - 1 0 . Ex a m in in g a ru n ning se rve r a p plicat ion 34 The first CoCreateInstance( ) request for a com ponent in a ser ver applicat ion creat es a new dllhost process, t o host com ponent s from t hat applicat ion only. Subsequent CoCreateInstance( ) calls t o obj ect s from t he sam e applicat ion creat e new obj ect s in t he exist ing dllhost inst ance.
Library applicat ions will hav e no v isual feedback when t hey are r unning in a client process, even if t hat pr ocess is anot her COM+ serv er applicat ion. Expand t he COM+ Applicat ions folder and select t he St at us View on t he Com ponent Services Explorer t oolbar ( t he but t on at t he far r ight end of t he t oolbar; see Figur e 1- 10) . The Com ponent Services Explorer will display t he process I D of t he r unning server applicat ions. Record t he process I D for t he Hello COM+ applicat ion.