sprites | GameDev.net

im trying to use d3d9 to create a 2d game. the following code is to try and set up sprite animation. i have cut out some of the code, hopefully havnt cut out anything important, when compiling i get the error Unhandled exception at 0x4fe5798b in startingD3D9.exe: 0xC0000005: Access violation writing location 0xababab5b. i roughly understand the problem being with pointers and memory but i dont know how to fix the issue. i know this is a common issue and i looked on msdn and it used the example int foo; int * ip = NULL; foo = *ip; //crash! i just dont know how to apply it. thanks mark



//loop through images
	int nImage = 0 ;

.....
// some code removed which wasnt relevant
.....
			//create texture
			m_pDestinationDevice->CreateTexture ( nTextureWidth , nTextureHeight , 1 , 0 , Format , D3DPOOL_DEFAULT , &m_pTextures [ nImage ], NULL ) ;

			//grab texture surface
			IDirect3DSurface9* pTextureSurface ;
			m_pTextures [ nImage ]->GetSurfaceLevel ( 0 , &pTextureSurface ) ;

			//source and destination
			POINT ptDst ;
			RECT rcSrc ;
			ptDst.x = 0 ;
			ptDst.y = 0 ;
			SetRect ( &rcSrc , 0 , 0 , nTextureWidth , nTextureHeight ) ;

			//copy rectangle
			m_pDestinationDevice->UpdateSurface ( pSurface , &rcSrc , pTextureSurface , &ptDst ) ;

			//release texture surface
			pTextureSurface->Release ( ) ;

			//offset rectangle
			OffsetRect ( &rcImage , -ptCenter.x , -ptCenter.y ) ;  //breaks here due to ptCenter not beign defined

			//set up vertices
			m_Vertices [ nImage * 4 ].x = rcImage.left ;
			m_Vertices [ nImage * 4 ].y = rcImage.top ;
			m_Vertices [ nImage * 4 ].z = 0.0f ;
			m_Vertices [ nImage * 4 ].rhw = 1.0f ;
			m_Vertices [ nImage * 4 ].diffuse = D3DCOLOR_XRGB ( 255 , 255 , 255 ) ;
			m_Vertices [ nImage * 4 ].u = 0.0f ;
			m_Vertices [ nImage * 4 ].v = 0.0f ;
			m_Vertices [ nImage * 4 + 1 ].x = rcImage.right ;
			m_Vertices [ nImage * 4 + 1 ].y = rcImage.top ;
			m_Vertices [ nImage * 4 + 1 ].z = 0.0f ;
			m_Vertices [ nImage * 4 + 1 ].rhw = 1.0f ;
			m_Vertices [ nImage * 4 + 1 ].diffuse = D3DCOLOR_XRGB ( 255 , 255 , 255 ) ;
			m_Vertices [ nImage * 4 + 1 ].u = ( float ) nSpriteWidth / ( float ) nTextureWidth ;
			m_Vertices [ nImage * 4 + 1 ].v = 0.0f ;
			m_Vertices [ nImage * 4 + 2 ].x = rcImage.left ;
			m_Vertices [ nImage * 4 + 2 ].y = rcImage.bottom ;
			m_Vertices [ nImage * 4 + 2 ].z = 0.0f ;
			m_Vertices [ nImage * 4 + 2 ].rhw = 1.0f ;
			m_Vertices [ nImage * 4 + 2 ].diffuse = D3DCOLOR_XRGB ( 255 , 255 , 255 ) ;
			m_Vertices [ nImage * 4 + 2 ].u = 0.0f ;
			m_Vertices [ nImage * 4 + 2 ].v = ( float ) nSpriteHeight / ( float ) nTextureHeight ;
			m_Vertices [ nImage * 4 + 3 ].x = rcImage.right ;
			m_Vertices [ nImage * 4 + 3 ].y = rcImage.bottom ;
			m_Vertices [ nImage * 4 + 3 ].z = 0.0f ;
			m_Vertices [ nImage * 4 + 3 ].rhw = 1.0f ;
			m_Vertices [ nImage * 4 + 3 ].diffuse = D3DCOLOR_XRGB ( 255 , 255 , 255 ) ;
			m_Vertices [ nImage * 4 + 3 ].u = ( float ) nSpriteWidth / ( float ) nTextureWidth ;
			m_Vertices [ nImage * 4 + 3 ].v = ( float ) nSpriteHeight / ( float ) nTextureHeight ;

			//increment image number
			nImage ++ ;
.....
// some code removed which wasnt relevant
.....
//retrieve information
IDirect3DTexture9* CSpriteSet::GetTexture ( int nImage ) 
{
	//return the texture
	return ( m_pTextures [ nImage ] ) ;
}

SpriteSetVertex* CSpriteSet::GetVertex ( int nImage , int nVertex ) 
{
	//return pointer to the vertex
	return ( &m_Vertices [ nImage * 4 + nVertex ] ) ;
}

//render
void CSpriteSet::PutSprite ( int nImage , float x , float y , float angle , float scalex , float scaley ) 
{
.....
// some code removed which wasnt relevant
.....
	//set the texture
	m_pDestinationDevice->SetTexture ( 0 , m_pTextures[nImage] ) ;

	//render
	m_pDestinationDevice->DrawPrimitiveUP ( D3DPT_TRIANGLESTRIP , 2 , | , sizeof ( SpriteSetVertex ) ) ;

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