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## Chapter 23
The TYPINFO unit

The TypeInfo unit contains many routines which can be used for the querying of the Run-Time Type Information (RTTI) which is generated by the compiler for classes that are compiled under the {$M+} switch. This information can be used to retrieve or set property values for published properties for totally unknown classes. In particular, it can be used to stream classes. The TPersistent class in the Classes unit is compiled in the {$M+} state and serves as the base class for all classes that need to be streamed.

The unit should be compatible to the Delphi 5 unit with the same name. The only calls that are still missing are the Variant calls, since Free Pascal does not support the variant type yet.

The examples in this chapter use a rttiobj file, which contains an object that has a published property of all supported types. It also contains some auxiliary routines and definitions.

23.1 Constants, Types and variables
Constants
types
23.2 Function list by category
Examining published property information
Getting or setting property values
Auxiliary functions
23.3 Functions and Procedures
FindPropInfo
GetEnumName
GetEnumProp
GetEnumValue
GetFloatProp
GetInt64Prop
GetMethodProp
GetObjectProp
GetObjectPropClass
GetOrdProp
GetPropInfo
GetPropInfos
GetPropList
GetPropValue
GetSetProp
GetStrProp
GetTypeData
GetVariantProp
IsPublishedProp
IsStoredProp
PropIsType
PropType
SetEnumProp
SetFloatProp
SetInt64Prop
SetMethodProp
SetObjectProp
SetOrdProp
SetPropValue
SetSetProp
SetStrProp
SetToString
SetVariantProp
StringToSet

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