README.TXT

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#  ActiveMovie readme.txt 
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The async sample code comprises 3 directories: 
 
 
INCLUDE 
------- 
 
Defines some helper classes to create filters which conform to the 
IAsyncReader interface. 
 
 
Four classes are defined: 
 
    CAsyncReader 
    ------------ 
    To create a filter.  Defines the filter and pin. 
 
    CAsyncOutputPin 
    --------------- 
    The filter's output pin 
 
    CAsyncIo 
    -------- 
    Methods to manage a set of async requests 
 
    CAsyncStream 
    ------------ 
    An abstract class that represents the source of the data 
 
 
BASE 
---- 
 
    Impelments 
 
    -- CAsyncReader 
 
    -- CAsyncOutputPin 
 
    -- CAsyncIo 
 
    CAsyncReader is passed a CAsyncStream object which the filter uses 
    as its data source 
 
 
MEMFILE 
------- 
 
    Consists of 
 
    1.  A definition of 
 
        --  CMemStream - a non-abstract class derived from CAsyncStream that 
            wraps a memory segment as the IAsyncReader source data 
 
        --  CMemReader - a source filter derived from CAsyncReader.  It 
            just overrides the constructor of CAsyncReader to set the 
            output pin's media type dependent on the file type 
 
    1.  A main() routine that 
 
        Opens a file 
 
        Guesses the file's media type dependent on the file extension.  Note 
        that RenderFile actually looks at the check bytes in the 
 
            HKEY_CLASSES_ROOT\Media Type 
 
        key of the registation data base to try to determine the media type 
        and media subtype of the file. 
 
        Creates a filter graph 
 
        Creates a source filter of type CMemReader and adds it to the filter 
        graph 
 
        Renders the output pin of this filter 
 
        Plays the graph through once