Como criar constantes e declaração de DLL em uma biblioteca de tipo

   [
   // The Universal Unique identifier (UUID), needs to be generated by
   // using uuid.exe program. Then, you paste the value into the type
   // library.
   uuid(006da100-110f-11cf-83b2-00aa0068851c),

   // The Help String comes up in the object browser as the second
   // piece of the library description in the "Libraries/Projects" combo
   // box.
   helpstring("Constants TypeLib"),

   // The Locale Identifier (LCID), identifies the language the type
   // library applies to.
   lcid(0x9),

   // This is the version number of the type library.
   version(1.0)
   ]

   // This is the name of the type library. It comes up in the object
   // browser as the first piece of the library description in the
   // "Libraries/Projects" combo box.
   library MyLib
   {
     // Define numeric constants.
     typedef enum tagConst
        {
          mylibConst1,       // Make the constant mylibconst1 equal to 0.
          mylibConst2=5,     // Make the constant mylibconst2 equal to 5.
          mylibConst3=7      // Make the constant mylibconst3 equal to 7.
        }Constants;

      // You need to define string constants in a module.
      // Modules also need to reference a dll name. In this case you don't
      // need to, so just give it a bogus name.
      [dllname("bogus")]
      module MoreConstants
       {
         // Define a constant mystr and assign it the value StringConstant.
         const LPSTR mystr="StringConstant";
       };

      // Now call a function located in the Windows API, specifically
      // User32.dll. Now you see why you need a dll name here, this is
      // where the API function will come from.
      [dllname("user32.dll")]
      module APIDeclare
       {
         // Give the API function a descriptive help line, this will
         // be seen in the Object browser. Then, you can declare the
         // function. The entry attribute specifies the identifier for the
         // entry point into the dll.
         // The in attribute specifies a parameter as a value going into
         // the function.
         //Note that the following two lines need to be all on one line.
   [helpstring("Test API function Declaration"), entry("CloseWindow")]_
    boolean

   CloseWindow([in] long Winhndl);
       };
   }