Accessing VC++ interface methods from C#

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  • Shrihari Devji
    #1

    Accessing VC++ interface methods from C#

    Hello

    I have a windows service developed in VC++. It exposes some
    interface methods. I need to access them from C# client.
    I cant add the reference since it might be running on some other
    system. So I used activators to access the methods with the help of
    InvokeMember function. But now the problem is I am not able to get the S_OK
    or S_FALSE result values from Interface method. How to get this value. Or is
    there any other way to solve the problem I have.

    Regards
    Shrihari Devji
    RBEI Bangalore


    Tags: None
    • grps.gobinath@gmail.com
      #2
      Re: Accessing VC++ interface methods from C#

      On Mar 6, 11:36 am, "Shrihari Devji" <srihari.de...@ in.bosch.com>
      wrote:
      Hello
      >
      I have a windows service developed in VC++. It exposes some
      interface methods. I need to access them from C# client.
      I cant add the reference since it might be running on some other
      system. So I used activators to access the methods with the help of
      InvokeMember function. But now the problem is I am not able to get the S_OK
      or S_FALSE result values from Interface method. How to get this value. Or is
      there any other way to solve the problem I have.
      >
      Regards
      Shrihari Devji
      RBEI Bangalore
      Hi there,
      Generally, the return values S_OK, E_FAIL and other S_FALSE
      will be consumed by the .Net's Runtime Callable Wrapper(RCW). If the VC
      ++ service is returning E_FAIL, the RCW will convert that as an
      Exception and throws it to the C# client. so it is better to provide
      try...catch blocks to know the return types.

      goB

        Comment

        • Shrihari Devji
          #3
          Re: Accessing VC++ interface methods from C#

          <grps.gobinath@ gmail.comwrote in message
          news:a4074084-00b6-49d5-8e28-01fe09db5ee2@u6 9g2000hse.googl egroups.com...
          On Mar 6, 11:36 am, "Shrihari Devji" <srihari.de...@ in.bosch.com>
          wrote:
          >Hello
          >>
          > I have a windows service developed in VC++. It exposes some
          >interface methods. I need to access them from C# client.
          > I cant add the reference since it might be running on some other
          >system. So I used activators to access the methods with the help of
          >InvokeMember function. But now the problem is I am not able to get the
          >S_OK
          >or S_FALSE result values from Interface method. How to get this value. Or
          >is
          >there any other way to solve the problem I have.
          >>
          >Regards
          >Shrihari Devji
          >RBEI Bangalore
          >
          Hi there,
          Generally, the return values S_OK, E_FAIL and other S_FALSE
          will be consumed by the .Net's Runtime Callable Wrapper(RCW). If the VC
          ++ service is returning E_FAIL, the RCW will convert that as an
          Exception and throws it to the C# client. so it is better to provide
          try...catch blocks to know the return types.
          >
          goB
          Hi

          But we are not getting an excetption when it returns S_FALSE. So is
          there any way to get it??

          Regards
          Shrihari Devji


            Comment

            • grps.gobinath@gmail.com
              #4
              Re: Accessing VC++ interface methods from C#

              On Mar 10, 1:53 pm, "Shrihari Devji" <srihari.de...@ in.bosch.com>
              wrote:
              <grps.gobin...@ gmail.comwrote in message
              >
              news:a4074084-00b6-49d5-8e28-01fe09db5ee2@u6 9g2000hse.googl egroups.com...
              >
              >
              >
              On Mar 6, 11:36 am, "Shrihari Devji" <srihari.de...@ in.bosch.com>
              wrote:
              Hello
              >
                      I have a windows service developed in VC++. It exposes some
              interface methods. I need to access them from C# client.
                      I cant add the reference since it might be running on some other
              system. So I used activators to access the methods with the help of
              InvokeMember function. But now the problem is I am not able to get the
              S_OK
              or S_FALSE result values from Interface method. How to get this value. Or
              is
              there any other way to solve the problem I have.
              >
              Regards
              Shrihari Devji
              RBEI Bangalore
              >
              Hi there,
                       Generally, the return values S_OK, E_FAIL and other S_FALSE
              will be consumed by the .Net's Runtime Callable Wrapper(RCW). If the VC
              ++ service is returning E_FAIL, the RCW will convert that as an
              Exception and throws it to the C# client. so it is better to provide
              try...catch blocks to know the return types.
              >
              goB
              >
              Hi
              >
                  But we are not getting an excetption when it returns  S_FALSE. So is
              there any way to get it??
              >
              Regards
              Shrihari Devji
              Hi,
              Sorry for this late reply. S_FALSE is not exactly a failure.
              Exceptions will be raised only when the severity bits are set in the
              HRESULT. If you want to get exceptions, you may have to use anyone of
              the following

              E_UNEXPECTED - 8000FFFF Catastrophic failure
              E_NOTIMPL - 80004001 Not implemented
              E_OUTOFMEMORY 8007000E Out of memory
              E_INVALIDARG 80070057 One or more arguments are not valid
              E_NOINTERFACE 80004002 Interface not supported
              E_POINTER 80004003 Pointer not valid
              E_HANDLE 80070006 Handle not valid
              E_ABORT 80004004 Operation aborted
              E_FAIL 80004005 Unspecified error
              E_ACCESSDENIED 80070005 General access denied

              regards,
              goB

                Comment

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