C# COM entry point function

Collapse
This topic is closed.
X
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • =?Utf-8?B?R2Vvcmdl?=
    #1

    C# COM entry point function

    Hello everyone,


    I am a developer from C++ COM to C# COM. I feel confused about the entry
    point function for a C# COM object.

    In C++, we always initialize object through GetClassObject or
    DLLGetClassObje ct, but it seems C# does not need these functions?

    Here is a sample from MSDN.

    http://msdn2.microsoft.com/en-us/lib...38(VS.71).aspx

    So, in C# do we need to implement the required functions like
    GetClassObject? If no need, which function is the entry point for C# COM
    object -- I want to find the entry point function so that I can verify that
    my C# COM object can begin to talk with other COM clients.


    thanks in advance,
    George
    Tags: None
    • Willy Denoyette [MVP]
      #2
      Re: C# COM entry point function

      "George" <George@discuss ions.microsoft. comwrote in message
      news:03377E5B-B2FD-4381-AAE8-97503A60D65A@mi crosoft.com...
      Hello everyone,
      >
      >
      I am a developer from C++ COM to C# COM. I feel confused about the entry
      point function for a C# COM object.
      >
      In C++, we always initialize object through GetClassObject or
      DLLGetClassObje ct, but it seems C# does not need these functions?
      >
      Here is a sample from MSDN.
      >
      http://msdn2.microsoft.com/en-us/lib...38(VS.71).aspx
      >
      So, in C# do we need to implement the required functions like
      GetClassObject? If no need, which function is the entry point for C# COM
      object -- I want to find the entry point function so that I can verify
      that
      my C# COM object can begin to talk with other COM clients.
      >
      >
      thanks in advance,
      George

      You don't (can't) have to expose the COM activation/deactivation entry
      points, this is taken care of by mscoree.dll, who is registered as the
      "real" COM server when you register a .NET assembly as COM server (using
      regasm.exe for instance). mscoree.dll takes care of loading the CLR whenever
      you create an instance of a .NET class from a native COM client, the CLR
      takes care of loading the .NET assembly and exposing the core COM interfaces
      (IUnknow) and the interfaces you declared in your code.

      Willy.


        Comment

        • =?Utf-8?B?R2Vvcmdl?=
          #3
          Re: C# COM entry point function

          Thanks Willy,


          I have made some practices using regasm and following your comments. C# COM
          development is really defferent from C++ development from entry point.

          I am using MSDN sample COM server,

          http://msdn2.microsoft.com/en-us/lib...71(VS.80).aspx

          Then regasm will generate the following statements,

          Code:
          REGEDIT4

[HKEY_CLASSES_ROOT\CSharpServer.InterfaceImplementation]
@="CSharpServer.InterfaceImplementation"

[HKEY_CLASSES_ROOT\CSharpServer.InterfaceImplementation\CLSID]
@="{C6659361-1625-4746-931C-36014B146679}"

[HKEY_CLASSES_ROOT\CLSID\{C6659361-1625-4746-931C-36014B146679}]
@="CSharpServer.InterfaceImplementation"

[HKEY_CLASSES_ROOT\CLSID\{C6659361-1625-4746-931C-36014B146679}\InprocServer32]
@="mscoree.dll"
"ThreadingModel"="Both"
"Class"="CSharpServer.InterfaceImplementation"
"Assembly"="CSharpServer, Version=0.0.0.0, Culture=neutral,
PublicKeyToken=null"
"RuntimeVersion"="v2.0.50727"

[HKEY_CLASSES_ROOT\CLSID\{C6659361-1625-4746-931C-36014B146679}\InprocServer32\0.0.0.0]
"Class"="CSharpServer.InterfaceImplementation"
"Assembly"="CSharpServer, Version=0.0.0.0, Culture=neutral,
PublicKeyToken=null"
"RuntimeVersion"="v2.0.50727"

[HKEY_CLASSES_ROOT\CLSID\{C6659361-1625-4746-931C-36014B146679}\ProgId]
@="CSharpServer.InterfaceImplementation"

[HKEY_CLASSES_ROOT\CLSID\{C6659361-1625-4746-931C-36014B146679}\Implemented
Categories\{62C8FE65-4EBB-45E7-B440-6E39B2CDBF29}]
          I find only public class InterfaceImplem entation is in the reg file, but
          public interface IManagedInterfa ce is not in reg file. I do not know why
          regasm only cares about public classes -- why interface is not in reg file?

          (I think for client, the interface may also be used in application?)


          regards,
          George

          "Willy Denoyette [MVP]" wrote:
          "George" <George@discuss ions.microsoft. comwrote in message
          news:03377E5B-B2FD-4381-AAE8-97503A60D65A@mi crosoft.com...
          Hello everyone,


          I am a developer from C++ COM to C# COM. I feel confused about the entry
          point function for a C# COM object.

          In C++, we always initialize object through GetClassObject or
          DLLGetClassObje ct, but it seems C# does not need these functions?

          Here is a sample from MSDN.

          http://msdn2.microsoft.com/en-us/lib...38(VS.71).aspx

          So, in C# do we need to implement the required functions like
          GetClassObject? If no need, which function is the entry point for C# COM
          object -- I want to find the entry point function so that I can verify
          that
          my C# COM object can begin to talk with other COM clients.


          thanks in advance,
          George
          >
          >
          You don't (can't) have to expose the COM activation/deactivation entry
          points, this is taken care of by mscoree.dll, who is registered as the
          "real" COM server when you register a .NET assembly as COM server (using
          regasm.exe for instance). mscoree.dll takes care of loading the CLR whenever
          you create an instance of a .NET class from a native COM client, the CLR
          takes care of loading the .NET assembly and exposing the core COM interfaces
          (IUnknow) and the interfaces you declared in your code.
          >
          Willy.
          >
          >
          >

            Comment

            • Willy Denoyette [MVP]
              #4
              Re: C# COM entry point function

              "George" <George@discuss ions.microsoft. comwrote in message
              news:8BB02861-FF97-4136-812D-2ADE9F357CB5@mi crosoft.com...
              Thanks Willy,
              >
              >
              I have made some practices using regasm and following your comments. C#
              COM
              development is really defferent from C++ development from entry point.
              >
              I am using MSDN sample COM server,
              >
              http://msdn2.microsoft.com/en-us/lib...71(VS.80).aspx
              >
              Then regasm will generate the following statements,
              >
              Code:
              >
REGEDIT4
>
[HKEY_CLASSES_ROOT\CSharpServer.InterfaceImplementation]
@="CSharpServer.InterfaceImplementation"
>
[HKEY_CLASSES_ROOT\CSharpServer.InterfaceImplementation\CLSID]
@="{C6659361-1625-4746-931C-36014B146679}"
>
[HKEY_CLASSES_ROOT\CLSID\{C6659361-1625-4746-931C-36014B146679}]
@="CSharpServer.InterfaceImplementation"
>
[HKEY_CLASSES_ROOT\CLSID\{C6659361-1625-4746-931C-36014B146679}\InprocServer32]
@="mscoree.dll"
"ThreadingModel"="Both"
"Class"="CSharpServer.InterfaceImplementation"
"Assembly"="CSharpServer, Version=0.0.0.0, Culture=neutral,
PublicKeyToken=null"
"RuntimeVersion"="v2.0.50727"
>
[HKEY_CLASSES_ROOT\CLSID\{C6659361-1625-4746-931C-36014B146679}\InprocServer32\0.0.0.0]
"Class"="CSharpServer.InterfaceImplementation"
"Assembly"="CSharpServer, Version=0.0.0.0, Culture=neutral,
PublicKeyToken=null"
"RuntimeVersion"="v2.0.50727"
>
[HKEY_CLASSES_ROOT\CLSID\{C6659361-1625-4746-931C-36014B146679}\ProgId]
@="CSharpServer.InterfaceImplementation"
>
[HKEY_CLASSES_ROOT\CLSID\{C6659361-1625-4746-931C-36014B146679}\Implemented
Categories\{62C8FE65-4EBB-45E7-B440-6E39B2CDBF29}]
>
              >
              I find only public class InterfaceImplem entation is in the reg file, but
              public interface IManagedInterfa ce is not in reg file. I do not know why
              regasm only cares about public classes -- why interface is not in reg
              file?
              >
              (I think for client, the interface may also be used in application?)
              >
              >
              regards,
              George
              The /reg option is meant for informational purposes only, you should
              register your classes with the /tlb option. Classes that are registered
              using the reg file won't be able to be created using CoCreateInstanc e, nor
              will it include the (optional) registration done by the custom registration
              functions (see ComRegisterFunc tionAttribute).

              Willy.

                Comment

                Previous template Next
                Working...