[Overview][Constants][Types][Classes][Procedures and functions][Index] Reference for unit 'TypInfo' (#rtl)

PropType

Return the type of a property

Declaration

Source position: typinfo.pp line 783

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

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.

Documentation generated on: May 14 2021