DirectInput is not taking input

Every thing runs fine, but DirectInput does not respond to key events. This is what I use in my code

  
#define KEY_DOWN( name, key )			( ( name[key] & 0x80 ) ? true : false )


if ( FAILED( g_pKeyboard->GetDeviceState( sizeof( UCHAR[256] ), ( LPVOID )buffer ) ) )
		g_pKeyboard->Acquire();

	if ( FAILED( g_pMouse->GetDeviceState( sizeof( DIMOUSESTATE ), ( LPVOID )& states ) ) )
		g_pMouse->Acquire();

	if ( KEY_DOWN( buffer, VK_ESCAPE ) )
		PostQuitMessage( 0 );

This has worked before, why isn''t it now? I have now errors setup DirectInput for keybaord and mouse input. They just don''t respond. There''s now reason for it not to work!! That I can see any ways.

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