sdk/include/ddk/dxapi.h

   1 ULONG
   2 DxApiGetVersion(void);
   3
   4 ULONG
   5 DxApi(
   6   IN ULONG dwFunctionNum,
   7   IN PVOID lpvInBuffer,
   8   IN ULONG cbInBuffer,
   9   IN PVOID lpvOutBuffer,
  10   IN ULONG cbOutBuffer);