TMemoryStream

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

Standard implementation of a stream that stores its data in memory

Declaration

Source position: classesh.inc line 1213

Type
  TMemoryStream = class (TCustomMemoryStream)
  private
    FCapacity : PtrInt;
    procedure SetCapacity(NewCapacity: PtrInt);
  protected
    function Realloc(var NewCapacity: PtrInt) : Pointer;  Virtual;
    Capacity : PtrInt;
  public
    destructor Destroy;  Override;
    procedure Clear;
    procedure LoadFromStream(Stream: TStream);
    procedure LoadFromFile(const FileName: string);
    procedure SetSize(const NewSize: Int64);  Override;
    function Write(const Buffer; Count: LongInt) : LongInt;  Override;
  end
  ;

Description

TMemoryStream is a TStream descendant that stores it's data in memory. It descends directly from TCustomMemoryStream and implements the necessary to allocate and de-allocate memory directly from the heap. It implements the Write method which is missing in TCustomMemoryStream.

TMemoryStream also introduces methods to load the contents of another stream or a file into the memory stream.

It is not necessary to do any memory management manually, as the stream will allocate or de-allocate memory as needed. When the stream is freed, all allocated memory will be freed as well.

Members

Member	Type	Visibility	Description
Capacity	Property	protected	Current capacity of the stream.
Clear	Method	public	Zeroes the position, capacity and size of the stream.
Destroy	Method	public	Frees any allocated memory and destroys the memory stream.
FCapacity	Field	private
LoadFromFile	Method	public	Loads the contents of a file into memory.
LoadFromStream	Method	public	Loads the contents of a stream into memory.
Realloc	Method	protected	Sets the new capacity for the memory stream
SetCapacity	Method	private
SetSize	Method	public	Sets the size for the memory stream.
Write	Method	public	Writes data to the stream's memory.

Inheritance

Class	Description
TMemoryStream	Standard implementation of a stream that stores its data in memory

See also

Name	Description
PtrInt	Signed integer type with same size as Pointer.
PtrInt	Signed integer type with same size as Pointer.
TCustomMemoryStream	Abstract stream that stores its data in memory.
TStream	Base class for streams.

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