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 afieldstring()      Return the contents of a field in an alias
------------------------------------------------------------------------------
 Declaration
   database.hdr

 Syntax
   func char afieldstring extern
   param       alias sDatabase, ;
         value uint  uField

 Arguments
   sDatabase is the alias to retrieve information about.
   uField is the field number.

 Return
   The contents of the field as a character string.

 Description
   The afieldstring() function returns the contents of the uField-th
   field in sDatabase.

   The function only considers the fields which have been declared in the
   matching dbfdef statement, i. e. the physical database file might contain 
   more fields.

 Example
   #define EXAMPLE_DATABASE
   #include example.hdr

   proc Test_afieldstring
   vardef
      uint n
   enddef
   open sTest
   for n := 1 to NUM_FIELDS
      ? n, afieldstring( sTest, n )         // show field contents
   next
   endproc

   proc main
   Test_afieldstring()
   endproc