System.TypInfo.GetObjectPropClass

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Object Pascal

function GetObjectPropClass(Instance: TObject; const PropName: string): TClass;
function GetObjectPropClass(Instance: TObject; PropInfo: PPropInfo): TClass;
function GetObjectPropClass(PropInfo: PPropInfo): TClass;

C++

extern DELPHI_PACKAGE System::TClass __fastcall GetObjectPropClass(System::TObject* Instance, const System::UnicodeString PropName)/* overload */;

Properties

Type Visibility Source Unit Parent
function public
System.TypInfo.pas
System.TypInfo.hpp
System.TypInfo System.TypInfo

Description

Returns the class type of a component property that is an object type.

GetObjectPropClass utilises Object Pascal's RTTI (Run Time Type Information) to return the class type of a component's property where that property is an object.

In one form of this function, the object Instance's property is defined by a PropInfo record. GetPropInfo and GetPropList can be used to obtain such a record.

In the other form of this function, the name of the property, PropName, is explicitly given.

In both forms of the function, the class type of the property object value is returned.

The intrinsic value of this function is to allow retrieval of component properties without the need to hard code the property name. This allows mass visual component processing at run time.

Use GetPropValue to retrieve a property value where the type is unknown - it is returned in a Variant type.

Note: If the specified property does not exist, or is not a published property, an EPropertyError exception is thrown.

See Also