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Chapter 7 — Programming

CN2B Mobile Computer User’s Manual 151

IOCTL_HAL_ITC_READ_PARM

Usage

#include “oemioctl.h”

Syntax

BOOL KernelIoControl( IOCTL_HAL_ITC_READ_PARM,LPVOID

lpInBuf,DWORD nInBufSize,LPVOID lpOutBuf,DWORD

nOutBufSize,LPDWORD lpBytesReturned );

Parameters

lpInBuf Points to this structure. See “ID Field Values” below.

struct PARMS {

BYTE id;

BYTE ClassId;

};

nInBufSize Must be set to the size of the PARMS structure.

lpOutBuf Must point to a buffer large enough to hold the return data of the function. If this field is set to

NULL and nOutBufSize is set to zero when the function is called the function will return the

number bytes required by the buffer.

nOutBufSize The size of lpOutBuf in bytes.

lpBytesReturned Number of bytes returned by the function for the data requested.

Return Values

Returns TRUE if function succeeds. Returns FALSE if the function fails.

GetLastError() may be used to get the error value. Either

ERROR_INVALID_PARAMETER or

ERROR_INSUFFICIENT_BUFFER may be returned when this function

is used to get the error.

ID Field Values

The id field of the PARMS structure may be one of the following values:

ID Field Values

ITC_NVPARM_SERIAL_NUM

This IOCTL returns the serial number of the device in BCD format. Six bytes are returned in the buffer pointed to by

the lpOutBuffer parameter.

ITC_NVPARM_MANF_DATE

This IOCTL returns the device date of manufacture in the BCD YYYY/MM/DD format. Four bytes are returned in

the buffer pointed to by the lpOutBuffer parameter.

ITC_NVPARM_SERVICE_DATE

This IOCTL returns the device’s date of last service in BCD YYYY/MM/DD format. Four bytes are returned in the

buffer pointed to by the lpOutBuffer parameter.

ITC_NVPARM_DISPLAY_TYPE

This returns the device’s display type. One byte is returned in the buffer pointed to by the lpOutBuffer parameter.

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