CDataMemory : CDataFile

Description

Data Members

Constructors

CDataMemory()
CDataMemory( const CDataMemory& source )
CDataMemory( const BYTE * buffer_p, DWORD number_of_bytes )
CDataMemory( const CByteArray& source )

Constructs the object.

Methods

void Append( const CByteArray& source )
void Append( const CDataMemory& source )

Appends the contents of source to this object.

void AppendTo( CByteArray& data )

Appends the contents of this object to data.

void Close( void )

Closes the "file".

void Copy( const BYTE * buffer, DWORD number_of_bytes_to_copy )
void Copy( const CByteArray& buffer )
void Copy( const CDataMemory& buffer )

Copies the contents of buffer to this object. It replaces the current contents of this object with whatever is in buffer.

void CopyTo( CByteArray& data )

Replaces the contents of data with the contents of this object.

void Empty( void )

Empties this objects.

void Flush( void )

Does nothing, just intercept the call. Since we aren't really a file, it would just cause the base class to blow up.

const BYTE * GetData( void ) const

Returns a pointer to the raw data.

DWORD GetLength( void ) const

Returns the number of bytes currently in the buffer.

DWORD GetPosition( void ) const

Returns the current file pointer.

BOOL Open( LPCTSTR filename, UINT mode )

Doesn't do anything.

UINT Read( void * buffer, UINT number_of_bytes_to_read )

Reads data from the buffer.

long Seek( long offset, UINT from )

Positions the file pointer.

void Write( const void * buffer, UINT number_of_bytes_to_write )

Appends data to the buffer.

Operators

const CDataMemory& operator = ( const CDataMemory& source )
const CDataMemory& operator = ( const CByteArray& source )

Calls the Copy() method.

const CDataMemory& operator += ( const CDataMemory& source )
const CDataMemory& operator += ( const CByteArray& source )

Calls the Append() method.

Example

#include <wfc.h>

void read_next_chunk( CDataMemory& data_in_memory, CDataChunk& data )
{
   WFCTRACEINIT( TEXT( "read_next_chunk()" ) );

   data_in_memory.GetData( data );

   _tprintf( TEXT( "Read %lu bytes\n" ), data.Data.GetSize() );
}