COM CreateInstance method

This is a discussion on COM CreateInstance method within the C++ Programming forums, part of the General Programming Boards category; Hello everyone, I think there is only one COM CreateInstance method, which belongs to IClassFactory interface. Is there another CreateInstance ...

  1. #1
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    COM CreateInstance method

    Hello everyone,


    I think there is only one COM CreateInstance method, which belongs to IClassFactory interface.

    Is there another CreateInstance method, which does not belongs to any class/interface and belongs to the COM global library function (like CoCreateInstance)?


    thanks in advance,
    George

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    I think coGetClassObject

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    Thanks manohar.amit,


    Sorry that I have not made myself understood. My point is beyond the wellknown CreateInstance function in IClassFactory, are there any other methods (defined by COM interface/class, not by user defined function), which has the exact name of CreateInstance in your experience?

    Let me know if I have not made myself understood. In this question, I just want to know how many functions which have the same name of CreateInstance. :-)


    regards,
    George

    Quote Originally Posted by manohar.amit View Post
    I think coGetClassObject

  4. #4
    Cat without Hat CornedBee's Avatar
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    Grep the headers.

    Why do you want to know, anyway? This is a really weird question.
    All the buzzt!
    CornedBee

    "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
    - Flon's Law

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    Hi CornedBee,


    I am reading some code from others, but currently I can not debug because of other reaons, and I want to know if I met with CreateInstance (if it is not defined by developer
    himself), it is the one belongs to IClassFactory?

    (the code contains some macro, because of no debug environment, I need to confirm with others)

    BTW: besides the CreateInstance from IClassFactory, are there any other method which has the same name in Microsoft COM SDK or related classes/interfaces?

    regards,
    George

    Quote Originally Posted by CornedBee View Post
    Grep the headers.

    Why do you want to know, anyway? This is a really weird question.

  6. #6
    Cat without Hat CornedBee's Avatar
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    Code:
    cd path\to\platformsdk
    grep CreateInstance *
    Only works if you have a grep utility, of course. But find in files does similar stuff.

    This tells me that the following CreateInstance methods exist:
    1) ObjectContext::CreateInstance(BSTR, VARIANT*)
    2) ITransactionContextEx::CreateInstance(REFCLSID, REFIID, void**)
    3) ITransactionContext::CreateInstance(BSTR, VARIANT*)
    4) ICreateWithTransactionEx::CreateInstance(ITransact ion*, REFCLSID, REFIID, void**)
    5) ICreateWithTipTransactionEx::CreateInstance(BSTR, REFCLSID, REFIID, void**)
    6) IObjectContext::CreateInstance(REFCLSID, REFIID, void**)
    7) ITypeInfo::CreateInstance(IUnknown*, REFIID, void**)
    8) IClassFactory::CreateInstance(IUnknown*, REFIID, void**)
    All the buzzt!
    CornedBee

    "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
    - Flon's Law

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    Thanks CornedBee,


    Cool! I think my question is answered.

    Quote Originally Posted by CornedBee View Post
    Code:
    cd path\to\platformsdk
    grep CreateInstance *
    Only works if you have a grep utility, of course. But find in files does similar stuff.

    This tells me that the following CreateInstance methods exist:
    1) ObjectContext::CreateInstance(BSTR, VARIANT*)
    2) ITransactionContextEx::CreateInstance(REFCLSID, REFIID, void**)
    3) ITransactionContext::CreateInstance(BSTR, VARIANT*)
    4) ICreateWithTransactionEx::CreateInstance(ITransact ion*, REFCLSID, REFIID, void**)
    5) ICreateWithTipTransactionEx::CreateInstance(BSTR, REFCLSID, REFIID, void**)
    6) IObjectContext::CreateInstance(REFCLSID, REFIID, void**)
    7) ITypeInfo::CreateInstance(IUnknown*, REFIID, void**)
    8) IClassFactory::CreateInstance(IUnknown*, REFIID, void**)

    regards,
    George

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