Vb6 Convert

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  • Phil Hunt
    #1

    Vb6 Convert

    Hi
    Can you help me with converting a VB6 Declare Function construct to C#
    systax. I think it is in the form of

    [DLLImport ("A.DLL")]
    public extrn void someFunction(.. ...);

    But I don't see the association between the 2 statements. Can someone
    explain ?

    THanks


    Tags: None
    • Nicholas Paldino [.NET/C# MVP]
      #2
      Re: Vb6 Convert

      Phil,

      Well, the DllImport attribute tells the CLR what the name of the DLL is
      to load to find the function in (as well as other information, like the .
      The CLR will then use function information to figure out the signature of
      the function and load it from the dll, and subsequently call it.

      The "extern" keyword here, combined with the attribute indicates that
      the function is found in an unmanaged DLL (there should be a static keyword
      here as well).


      --
      - Nicholas Paldino [.NET/C# MVP]
      - mvp@spam.guard. caspershouse.co m

      "Phil Hunt" <aaa@aaa.comwro te in message
      news:%23r$DHm2P JHA.4424@TK2MSF TNGP06.phx.gbl. ..
      Hi
      Can you help me with converting a VB6 Declare Function construct to C#
      systax. I think it is in the form of
      >
      [DLLImport ("A.DLL")]
      public extrn void someFunction(.. ...);
      >
      But I don't see the association between the 2 statements. Can someone
      explain ?
      >
      THanks
      >

        Comment

        • Phil Hunt
          #3
          Re: Vb6 Convert

          The dll i have that has many entry point. It seems like I have to repeat the
          Import statement everytime I declare a different function. Is that a short
          hand for that. Also in VB6 the Declare stmt associate the fucntion with the
          dll. Can I do that in this contruct ?

          Thanks again


          "Nicholas Paldino [.NET/C# MVP]" <mvp@spam.guard .caspershouse.c omwrote in
          message news:OUdnZz2PJH A.3932@TK2MSFTN GP02.phx.gbl...
          Phil,
          >
          Well, the DllImport attribute tells the CLR what the name of the DLL is
          to load to find the function in (as well as other information, like the .
          The CLR will then use function information to figure out the signature of
          the function and load it from the dll, and subsequently call it.
          >
          The "extern" keyword here, combined with the attribute indicates that
          the function is found in an unmanaged DLL (there should be a static
          keyword here as well).
          >
          >
          --
          - Nicholas Paldino [.NET/C# MVP]
          - mvp@spam.guard. caspershouse.co m
          >
          "Phil Hunt" <aaa@aaa.comwro te in message
          news:%23r$DHm2P JHA.4424@TK2MSF TNGP06.phx.gbl. ..
          >Hi
          >Can you help me with converting a VB6 Declare Function construct to C#
          >systax. I think it is in the form of
          >>
          >[DLLImport ("A.DLL")]
          >public extrn void someFunction(.. ...);
          >>
          >But I don't see the association between the 2 statements. Can someone
          >explain ?
          >>
          >THanks
          >>
          >
          >

            Comment

            • Nicholas Paldino [.NET/C# MVP]
              #4
              Re: Vb6 Convert

              Phil,

              Yes, you are right, you have to make a new declaration for each function
              that you want to use through the P/Invoke layer.

              There is no shorthand for that, AFAIK.

              The DllImport attribute is what associates the function declaration with
              the DLL that it is located in. You have to repeat this for every
              declaration as well.


              --
              - Nicholas Paldino [.NET/C# MVP]
              - mvp@spam.guard. caspershouse.co m

              "Phil Hunt" <aaa@aaa.comwro te in message
              news:eHMj9O3PJH A.3932@TK2MSFTN GP02.phx.gbl...
              The dll i have that has many entry point. It seems like I have to repeat
              the Import statement everytime I declare a different function. Is that a
              short hand for that. Also in VB6 the Declare stmt associate the fucntion
              with the dll. Can I do that in this contruct ?
              >
              Thanks again
              >
              >
              "Nicholas Paldino [.NET/C# MVP]" <mvp@spam.guard .caspershouse.c omwrote
              in message news:OUdnZz2PJH A.3932@TK2MSFTN GP02.phx.gbl...
              >Phil,
              >>
              > Well, the DllImport attribute tells the CLR what the name of the DLL
              >is to load to find the function in (as well as other information, like
              >the . The CLR will then use function information to figure out the
              >signature of the function and load it from the dll, and subsequently call
              >it.
              >>
              > The "extern" keyword here, combined with the attribute indicates that
              >the function is found in an unmanaged DLL (there should be a static
              >keyword here as well).
              >>
              >>
              >--
              > - Nicholas Paldino [.NET/C# MVP]
              > - mvp@spam.guard. caspershouse.co m
              >>
              >"Phil Hunt" <aaa@aaa.comwro te in message
              >news:%23r$DHm2 PJHA.4424@TK2MS FTNGP06.phx.gbl ...
              >>Hi
              >>Can you help me with converting a VB6 Declare Function construct to C#
              >>systax. I think it is in the form of
              >>>
              >>[DLLImport ("A.DLL")]
              >>public extrn void someFunction(.. ...);
              >>>
              >>But I don't see the association between the 2 statements. Can someone
              >>explain ?
              >>>
              >>THanks
              >>>
              >>
              >>
              >
              >

                Comment

                • Phil Hunt
                  #5
                  Re: Vb6 Convert

                  Thanks for your help.

                  "Nicholas Paldino [.NET/C# MVP]" <mvp@spam.guard .caspershouse.c omwrote in
                  message news:udZi6T3PJH A.4224@TK2MSFTN GP04.phx.gbl...
                  Phil,
                  >
                  Yes, you are right, you have to make a new declaration for each
                  function that you want to use through the P/Invoke layer.
                  >
                  There is no shorthand for that, AFAIK.
                  >
                  The DllImport attribute is what associates the function declaration
                  with the DLL that it is located in. You have to repeat this for every
                  declaration as well.
                  >
                  >
                  --
                  - Nicholas Paldino [.NET/C# MVP]
                  - mvp@spam.guard. caspershouse.co m
                  >
                  "Phil Hunt" <aaa@aaa.comwro te in message
                  news:eHMj9O3PJH A.3932@TK2MSFTN GP02.phx.gbl...
                  >The dll i have that has many entry point. It seems like I have to repeat
                  >the Import statement everytime I declare a different function. Is that a
                  >short hand for that. Also in VB6 the Declare stmt associate the fucntion
                  >with the dll. Can I do that in this contruct ?
                  >>
                  >Thanks again
                  >>
                  >>
                  >"Nicholas Paldino [.NET/C# MVP]" <mvp@spam.guard .caspershouse.c omwrote
                  >in message news:OUdnZz2PJH A.3932@TK2MSFTN GP02.phx.gbl...
                  >>Phil,
                  >>>
                  >> Well, the DllImport attribute tells the CLR what the name of the DLL
                  >>is to load to find the function in (as well as other information, like
                  >>the . The CLR will then use function information to figure out the
                  >>signature of the function and load it from the dll, and subsequently
                  >>call it.
                  >>>
                  >> The "extern" keyword here, combined with the attribute indicates that
                  >>the function is found in an unmanaged DLL (there should be a static
                  >>keyword here as well).
                  >>>
                  >>>
                  >>--
                  >> - Nicholas Paldino [.NET/C# MVP]
                  >> - mvp@spam.guard. caspershouse.co m
                  >>>
                  >>"Phil Hunt" <aaa@aaa.comwro te in message
                  >>news:%23r$DHm 2PJHA.4424@TK2M SFTNGP06.phx.gb l...
                  >>>Hi
                  >>>Can you help me with converting a VB6 Declare Function construct to C#
                  >>>systax. I think it is in the form of
                  >>>>
                  >>>[DLLImport ("A.DLL")]
                  >>>public extrn void someFunction(.. ...);
                  >>>>
                  >>>But I don't see the association between the 2 statements. Can someone
                  >>>explain ?
                  >>>>
                  >>>THanks
                  >>>>
                  >>>
                  >>>
                  >>
                  >>
                  >
                  >

                    Comment

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