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HWIoctl

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This function is the device I/O control routine.

BOOL HWIoctl(
  DWORD dwOpenData,
  DWORD dwCode,
  PBYTE pBufIn,
  DWORD dwLenIn,
  PBYTE pBufOut,
  DWORD dwLenOut,
  PDWORD pdwActualOut 
);

Parameters

  • dwOpenData
    [in] Specifies a value returned from a call to the COM_Open function.
  • dwCode
    [in] Specifies an I/O control code to be performed.
  • pBufIn
    [in] Pointer to the data input to the device.
  • dwLenIn
    [in] Specifies the number of bytes being passed in.
  • pBufOut
    [out] Pointer to the output data from the device.
  • dwLenOut
    [out] Specifies the maximum number of bytes to receive from a device.
  • pdwActualOut
    [out] Pointer to the actual number of bytes received from a device.

Return Values

TRUE indicates success. FALSE indicates failure.

Remarks

The upper layer passes any unrecognized I/O Control codes through to this function. OEMs can implement custom I/O control codes for whatever purposes they need.

This function supports the implementation of the lower layers of serial port drivers.

Requirements

OS Versions: Windows CE 1.0 and later.
Header: Serhw.h.

See Also

COM_Open

 Last updated on Tuesday, May 18, 2004

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