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randomDecay

problems with IDirectDrawSurface7 pointer

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Wasup. I have a Sprite class which holds a pointer to an IDirectDrawSurface7 which is where the sprite frames are. When I create a new sprite, I pass in a bunch of stuff including what surface the frames reside in. Well, when I go to draw (blt) the current frame, nothing happens. And yes I am calling flip. anyway, here is the constructor and the Draw function:
    
Sprite::Sprite( IDirectDrawSurface7 *p_surfaceDest, 
			    LONG p_x,
				LONG p_y,
				DWORD p_cx,
				DWORD p_cy,
				LONG p_dx,
				LONG p_dy,
				int p_nFrames,
				bool p_used	) :
				
					m_pDDS( p_surfaceDest ),
					m_x( p_x ),
					m_y( p_y ),
					m_cx( p_cx ),
					m_cy( p_cy ),
					m_dx( p_dx ),
					m_dy( p_dy ),
					m_numFrames( p_nFrames ),
					m_used( p_used ),					
					m_frame( 0 ),
					m_dwMsecBasis( 20 ),
					m_dwTimeLastMoveX( 0 ),
					m_dwTimeLastMoveY( 0 ),					
					dwRemainderX( 0 ),
					dwRemainderY( 0 )
{
	
}
  

      
void Sprite::Draw( IDirectDrawSurface7 *pDDSDest )
{
	RECT rectSrc;
	RECT rectDst;

    rectSrc.left = 0;
    rectSrc.top = m_frame * m_cy;
    rectSrc.right = m_cx;
    rectSrc.bottom = rectSrc.top + m_cy;

    rectDst.left = m_x;
    rectDst.top = m_y;
    rectDst.right = rectDst.left + m_cx;
    rectDst.bottom = rectDst.top + m_cy;

	// diy clipping

	if ( m_x < 0 )
	{
		m_dx *= -1;
	}
	else if ( m_x + m_cx > SCREEN_WIDTH )
	{
		m_dx *= -1;
	}
	
	if ( m_y < 0 )
	{	
		m_dy *= -1;
	}
	else if ( m_y + m_cy > SCREEN_HEIGHT )
	{
		m_dy *= -1;
	}
	
	pDDSDest->Blt( &rectDst, m_pDDS, &rectSrc, DDBLT_KEYSRC | DDBLT_WAIT, NULL );
}
    
I believe it has something to do with m_pDDS, not sure tho. Anyone have a guess? edit - just to clarify about when I call Flip, it's in my DrawFrame function which is in my peek message loop. Edited by - randomDecay on March 19, 2002 12:25:18 PM

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For starters, does debug DX runtime say anything? And why don''t you add some error checking code and see for yourself?

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