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how do you know it is general dll or com dll
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Answer / chandrasekharreddy siddamreddy
Open the dll in dependency walker application
(depends.exe). If the dll is having following functions
DLLRegisterServer
DLLUnRegisterServer
DLLCanUnloadNow
DLLGetClassObject
It is a COM DLL otherwise it is not.
| Is This Answer Correct ? | 13 Yes | 1 No |
Answer / virat sarswat
Checking above listed four function is a option. Another
one is just try to egister dll using "Regsvr32" if it's a
com dll it will register otherwise it will prompt error for
entry point.
| Is This Answer Correct ? | 4 Yes | 0 No |
Answer / techy break
second answer is correct, checking dll not means, checking
in source code.So IUnKnowns pointer checking no
possible.Simply check using dependancy walker as in 2
| Is This Answer Correct ? | 1 Yes | 0 No |
Answer / sandeep mishra
COM DLLs export above listed 4 functions and it's mandatory
for any DLL to be qualified as a COM DLL.
Where in regular DLLs we get a list of exported functions
which from client application we will invoke.
| Is This Answer Correct ? | 0 Yes | 0 No |
Answer / bijender singh
COM Dll contails IUnknown interface but general DLL doesn't.
| Is This Answer Correct ? | 2 Yes | 4 No |
What are the different compatibility types when we create a COM component?
What is the difference, if any, between OLE and COM?
Explain queued components.
What is a moniker ?
Differentiate normal DLL to COM DLL
What is reference counting in com?
Which namespace do the classes, allowing you to support COM functionality, are located?
Let?s assume we have object B and aggregated object C (in- proc server), created by B. Can you access any interface of B from C? What?s the difference between aggregated and contained objects?
can a COM interface be implemented by more than one COM class in the same COM component?
2 Answers Cap Gemini, Honeywell,
Can you explain what is dcom?
What is In-proc?
When you call CoInitialize(NULL) function how it works internally.
MFC 
