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problem with D3DXSaveMeshToX

problem with D3DXSaveMeshToX

problem with D3DXSaveMeshToX

I'm having trouble with the D3DXSaveMeshToX function. I am starting with the most basic thing which is to open a file, and then save it right away. I get an access violation when I run this. From the debugger it looks like the error is in the getString function. Here is the code

// Load the mesh from the specified file
hr = D3DXLoadMeshFromX( strMesh, D3DXMESH_SYSTEMMEM, m_pd3dDevice,
ppAdjacencyBuffer, &pD3DXMtrlBuffer, NULL,
&m_dwNumMaterials, &pMeshSysMem );
if( FAILED(hr) )
goto End;

_tcscpy( m_strMeshFilename, _T("C:\\dx90sdk\\Samples\\Media\\tiger2.x") );

hr = D3DXSaveMeshToX(
(const unsigned long *)*ppAdjacencyBuffer,
(D3DXMATERIAL *)pD3DXMtrlBuffer,

Can anyone help me with this?

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