System.TCallDesc Record

TCallDesc is the dispatch call descriptor for variants, and PCallDesc is a pointer to this descriptior.

Pascal

TCallDesc = packed record
  CallType: Byte;
  ArgCount: Byte;
  NamedArgCount: Byte;
  ArgTypes: array[0..255] of Byte;
end;

C++

struct TCallDesc {
  Byte CallType;
  Byte ArgCount;
  Byte NamedArgCount;
  array[0..255] of Byte ArgTypes;
};

System

TCallDesc identifies a method call that was made using a Variant.

CallType identifies the method that was called.

ArgCount indicates the total number of arguments passed to the method.

NamedArgCount

ArgTypes is an array giving the type codes for each argument.