Whats wrong here? | GameDev.net

i almost copied the entire (working)tut for displaying a simple line on the screen, but after couple of frames it displays an access violation... my source:

  
g_pd3dDevice->Clear( 0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0,0,0), 1.0f, 0 );
	g_pd3dDevice->BeginScene();
	CVertex *vtxQuad;
	vbuffer->Lock(0, 0, (BYTE **)&vtxQuad, NULL);
	vtxQuad[0].Create(1, 0, 0);
	vtxQuad[1].Create(0, 1, 0);
	vbuffer->Unlock();
		
	g_pd3dDevice->SetStreamSource(0, vbuffer, sizeof(CVertex));
	g_pd3dDevice->SetVertexShader(D3DFVF_CVertex);
	g_pd3dDevice->DrawPrimitive(D3DPT_LINELIST, 0, 1);
	g_pd3dDevice->EndScene();
	g_pd3dDevice->Present( NULL, NULL, NULL, NULL );

whats wrong? Gil

Gil Zussman gil@gilzu.com http://www.gilzu.com

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