RAD Studio VCL Reference
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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. 

 

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