TBinaryObjectReader

[Properties (by Name)][Methods (by Name)][Events (by Name)]

Driver class descendant which reads component data stored in binary format.

Declaration

Source position: classesh.inc line 1421

Type
  TBinaryObjectReader = class (TAbstractObjectReader)
  protected
    FStream : TStream;
    FBuffer : Pointer;
    FBufSize : Integer;
    FBufPos : Integer;
    FBufEnd : Integer;
    function ReadWord : Word;
    function ReadDWord : LongWord;
    function ReadQWord : QWord;
    function ReadExtended : extended;
    procedure SkipProperty;
    procedure SkipSetBody;
  public
    constructor Create(Stream: TStream; BufSize: Integer);
    destructor Destroy;  Override;
    function NextValue : TValueType;  Override;
    function ReadValue : TValueType;  Override;
    procedure BeginRootComponent;  Override;
    procedure BeginComponent(var Flags: TFilerFlags; 
                            var AChildPos: Integer; 
                            var CompClassName: string; var CompName: string)
                            ;  Override;
    function BeginProperty : string;  Override;
    procedure Read(var Buf; Count: LongInt);  Override;
    procedure ReadBinary(const DestData: TMemoryStream);  Override;
    function ReadFloat : Extended;  Override;
    function ReadSingle : Single;  Override;
    function ReadDate : TDateTime;  Override;
    function ReadCurrency : Currency;  Override;
    function ReadIdent(ValueType: TValueType) : string;  Override;
    function ReadInt8 : ShortInt;  Override;
    function ReadInt16 : SmallInt;  Override;
    function ReadInt32 : LongInt;  Override;
    function ReadInt64 : Int64;  Override;
    function ReadSet(EnumType: Pointer) : Integer;  Override;
    procedure ReadSignature;  Override;
    function ReadStr : string;  Override;
    function ReadString(StringType: TValueType) : string;  Override;
    function ReadWideString : WideString;  Override;
    function ReadUnicodeString : UnicodeString;  Override;
    procedure SkipComponent(SkipComponentInfos: Boolean);  Override;
    procedure SkipValue;  Override;
  end
  ;

Description

The TBinaryObjectReader class reads component data stored in binary form in a file. For this, it overrides or implements all abstract methods from TAbstractObjectReader . No new functionality is added by this class, it is a driver class for the streaming system.

It should never be necessary to create an instance of this class directly. Instead, the TStream.WriteComponent call should be used.

Members

Member	Type	Visibility	Description
BeginComponent	Method	public	Start reading a component.
BeginProperty	Method	public	Start reading a property.
BeginRootComponent	Method	public	Start reading the root component.
Create	Method	public	Creates a new binary data reader instance.
Destroy	Method	public	Destroys the binary data reader.
FBufEnd	Field	protected
FBuffer	Field	protected
FBufPos	Field	protected
FBufSize	Field	protected
FStream	Field	protected
NextValue	Method	public	Return the type of the next value.
Read	Method	public	Read raw data from stream
ReadBinary	Method	public	Start reading a binary value.
ReadCurrency	Method	public	Read a currency value from the stream.
ReadDate	Method	public	Read a date.
ReadDWord	Method	protected
ReadExtended	Method	protected
ReadFloat	Method	public	Read a float value
ReadIdent	Method	public	Read an identifier
ReadInt16	Method	public	Read a 16-bits integer.
ReadInt32	Method	public	Read a 32-bits integer.
ReadInt64	Method	public	Read a 64-bits integer.
ReadInt8	Method	public	Read an 8-bits integer.
ReadQWord	Method	protected
ReadSet	Method	public	Read a set
ReadSignature	Method	public	Reads the filer signature
ReadSingle	Method	public	Read a single-size float value
ReadStr	Method	public	Read a short string
ReadString	Method	public	Read a string
ReadUnicodeString	Method	public	Read a Unicode string value
ReadValue	Method	public	Read the next value in the stream
ReadWideString	Method	public	Read a widestring value from the stream.
ReadWord	Method	protected
SkipComponent	Method	public	Skip a component's data
SkipProperty	Method	protected
SkipSetBody	Method	protected
SkipValue	Method	public	Skip a value's data

Inheritance

Class	Description
TBinaryObjectReader	Driver class descendant which reads component data stored in binary format.

See also

Name	Description
Integer	A signed 16-bits integer
Integer	A signed 16-bits integer
Integer	A signed 16-bits integer
TAbstractObjectReader	Abstract driver class to read stored component data.
TBinaryObjectWriter	Driver class which stores component data in binary form.
TStream	Base class for streams.

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