Topic: Entrypoint variable to AutoCAD release

[Fred Tomke]

Hello,

in AutoCAD 2012 the key for PostCommand has changed I wanted to solve this not by subclass the function but to create a static property to assign the key.

Code: [Select]

   private static string PostCommandEntryPoint
    {
      get
      {
        if (Product.AcadRel < 18.2)
          return "?acedPostCommand@@YAHPB_W@Z";
        else
          return "?acedPostCommand@@YAHPEB_W@Z";
      }
    }

    [System.Security.SuppressUnmanagedCodeSecurity]
    [DllImport("acad.exe", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Unicode, EntryPoint = PostCommandEntryPoint)]
    private static extern int acedPostCommand(string strExpr);


Unfortunately, MSVS notes that "EntryPoint =" needs a constant or typeof or array creation expression. Is there another chance to make it variable?

Thanks Fred

[LE3]

What I have been done is to add a conditional compilation symbol.
Go to Properties - Build - Conditional compilation symbols: _ACADTARGET_18

Then, I simple use:
#if (_ACADTARGET_18)
// your PInvoke calls goes here...
        // target A2010
#endif
#if (_ACADTARGET_17)
        // target A2007 trough A2009
#endif
#if (_ACADTARGET_18x64)
        // target A2009
#endif
#if (_ACADTARGET_17x64)
        // target A2009
#endif

[kaefer]

What I have been done is to add a conditional compilation symbol.

Very well, that makes it variable at compile time. But what's wrong with listing the alternatives as static methods? They're private anyway.

Code: [Select]

    public class Class1
    {
        private static void PostCommand(string strExpr)
        {
            if (Product.AcadRel < 18.2)
                acedPostCommandPre182(strExpr);
            else
                acedPostCommand182(strExpr);
        }

        [System.Security.SuppressUnmanagedCodeSecurity]
        [DllImport("acad.exe", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Unicode,
            EntryPoint = "?acedPostCommand@@YAHPB_W@Z")]
        private static extern int acedPostCommandPre182(string strExpr);

        [DllImport("acad.exe", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Unicode,
            EntryPoint = "?acedPostCommand@@YAHPEB_W@Z")]
        private static extern int acedPostCommand182(string strExpr);
    }


in AutoCAD 2012 the key for PostCommand has changed I wanted to solve this not by subclass the function but to create a static property to assign the key.

For subclassing see sinc's example here

[Fred Tomke]

For subclassing see sinc's example here

Thanks a lot, but I knew the way of subclassing. Since I was told that the entrypoints of 64Bit and 32Bit releases may differ I created two different classes with the same methods. But exactly that I wanted to avoid (sorry for my bad English). I hoped that the name of the entrypoint could be variable to shorten the code.

Thank you.
Fred

Code: [Select]

    private class Acadx86
    {
      [System.Security.SuppressUnmanagedCodeSecurity]
      [DllImport("acad.exe", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Unicode, EntryPoint = "?acedPostCommand@@YAHPB_W@Z")]
      private static extern int acedPostCommand(string strExpr);

      public static int PostCommand(string strExpr)
      {
        return acedPostCommand(strExpr);
      }
    [...other...]
    }

    private class Acadx64
    {
      [System.Security.SuppressUnmanagedCodeSecurity]
      [DllImport("acad.exe", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Unicode, EntryPoint = "?acedPostCommand@@YAHPEB_W@Z")]
      private static extern int acedPostCommand(string strExpr);

      public static int PostCommand(string strExpr)
      {
        return acedPostCommand(strExpr);
      }
    [...other...]
    }

    public static int PostCmd(string strCmd)
    {
      return (Common.OS.Is64Bit) ? Acadx64.PostCommand(strCmd) : Acadx86.PostCommand(strCmd);
    }


[LE3]

Very well, that makes it variable at compile time. But what's wrong with listing the alternatives as static methods? They're private anyway.

Don't see a problem.

[Fred Tomke]

What I have been done is to add a conditional compilation symbol.
Go to Properties - Build - Conditional compilation symbols: _ACADTARGET_18

Hi, does it mean, that you compile a dll for each AutoCAD release and plattform?
I still manged it to have only one for all.

Fred

[Fred Tomke]

[...] But what's wrong with listing the alternatives as static methods? They're private anyway.

Yes, you are right. I slept over it again and I've changed it this way.

Thanks, Fred

[LE3]

Hi, does it mean, that you compile a dll for each AutoCAD release and plattform?
I still manged it to have only one for all.

In my case, many of the solutions are custom objects (ARX) and required to be like this, with the exception of the last two that still are custom objects but done via NET wrappers, to avoid the use of PInvoke