Reference for package '#rtl'

PropType

Return the type of a property

Declaration

Source position: typinfo.pp line 883

  function PropType(Instance: TObject; const PropName: string) : TTypeKind;
  function PropType(AClass: TClass; const PropName: string) : TTypeKind;

Description

Proptype returns the type of the property PropName for a class. The class to be examined can be specified in one of 2 ways:

AClass
A class pointer.
Instance
An instance of the class.

Errors

No checks are done to ensure Instance or AClass are valid pointers. Specifying an invalid property name in PropName will result in an EPropertyError exception.

See also

Name Description
IsPublishedProp Check whether a published property exists.
IsStoredProp Check whether a property is stored.
PropIsType Check the type of a published property.

Example

program example17;
{ This program demonstrates the PropType function }
{$mode objfpc}
uses rttiobj,typinfo;
Var
  O : TMyTestObject;
begin
  O:=TMyTestObject.Create;
  Writeln('Property tests    : ');
  Write('PropType(O,BooleanField)     : ');
  Writeln(TypeNames[PropType(O,'BooleanField')]);
  Write('PropType(Class,BooleanField) : ');
  Writeln(TypeNames[PropType(O.ClassType,'BooleanField')]);
  Write('PropType(O,ByteField)        : ');
  Writeln(TypeNames[PropType(O,'ByteField')]);
  Write('PropType(Class,ByteField)    : ');
  Writeln(TypeNames[PropType(O.ClassType,'ByteField')]);
  O.Free;
end.