| Microsoft DirectX 8.1 (C++) | 
Retrieves the currently set vertex shader.
HRESULT GetVertexShader( DWORD* pHandle );
If the method succeeds, the return value is D3D_OK.
D3DERR_INVALIDCALL is returned if pHandle is invalid.
  Header: Declared in D3d8.h.
  Import Library: Use D3d8.lib.