HID_Transaction_Utilities.h

/*
    File:       HID_Transaction_Utilities.h
 
    Contains:   Implementation of the HID queue functions for the HID utilites.
    
    DRI: George Warner
 
    Copyright:  Copyright © 2002 Apple Computer, Inc., All Rights Reserved
 
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*/
 
#ifndef _HID_Transaction_Utilities_h_
#define _HID_Transaction_Utilities_h_
 
#include "HID_Utilities.h"
 
// ==================================
 
#ifdef __cplusplus
extern "C" {
#endif
 
// ==================================
// Create and open an transaction interface to device, required prior to extracting values or building Transactions
extern unsigned long HIDTransactionAddElement(pRecDevice pDevice, pRecElement pElement);
 
// removes an element from a Transaction
extern unsigned long  HIDTransactionRemoveElement(pRecDevice pDevice, pRecElement pElement);
 
// return true if this transaction contains this element
extern Boolean HIDTransactionHasElement(pRecDevice pDevice, pRecElement pElement);
 
/* This changes the default value of an element, when the values of the */
/* elements are cleared, on clear or commit, they are reset to the */
/* default value */
/* This call can be made on elements that are not in the transaction, but */
/* has undefined behavior if made on elements not in the transaction */
/* which are later added to the transaction. */
/* In other words, an element should be added before its default is */
/* set, for well defined behavior. */
extern unsigned long  HIDTransactionSetElementDefault(pRecDevice pDevice, pRecElement pElement,IOHIDEventStruct* pValueEvent);
 
/* Get the current setting of an element's default value */
extern unsigned long  HIDTransactionGetElementDefault(pRecDevice pDevice, pRecElement pElement,IOHIDEventStruct* pValueEvent);
 
/* Add a change to the transaction, by setting an element value */
/* The change is not actually made until it is commited */
/* The element must be part of the transaction or this call will fail */
extern unsigned long  HIDTransactionSetElementValue(pRecDevice pDevice, pRecElement pElement,IOHIDEventStruct* pValueEvent);
 
/* Get the current setting of an element value */
extern unsigned long  HIDTransactionGetElementValue(pRecDevice pDevice, pRecElement pElement,IOHIDEventStruct* pValueEvent);
 
/* Commit the transaction, or clear all the changes and start over */
/* timoutMS is the timeout in milliseconds, a zero timeout will cause */
/*  this call to be non-blocking (returning queue empty) if there */
/*  is a NULL callback, and blocking forever until the queue is */
/*  non-empty if their is a valid callback */
/* callback, if non-NULL is a callback to be called when data is */
/*  inserted to the queue  */
/* callbackTarget and callbackRefcon are passed to the callback */
extern unsigned long  HIDTransactionCommit(pRecDevice pDevice);
 
/* Clear all the changes and start over */
extern unsigned long  HIDTransactionClear(pRecDevice pDevice);
 
#ifdef __cplusplus
}
#endif
 
#endif // _HID_Transaction_Utilities_h_