Source code of Windows XP (NT5)
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/***************************************************************************
Copyright (c) 2000 Microsoft Corporation
Module Name:
Dot4Usb.sys - Lower Filter Driver for Dot4.sys for USB connected
IEEE 1284.4 devices.
File Name:
Registry.c
Abstract:
Registry access utility functions
Environment:
Kernel mode only
Notes:
THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
PURPOSE.
Copyright (c) 2000 Microsoft Corporation. All Rights Reserved.
Revision History:
01/18/2000 : created
Author(s):
Doug Fritz (DFritz)
Joby Lafky (JobyL)
****************************************************************************/
#include "pch.h"
/************************************************************************/
/* RegGetDword */
/************************************************************************/
//
// Routine Description:
//
// - Read a DWORD value from the registry (with caller specified
// default value) given an absolute KeyPath.
//
// - If we are unable to read the value from the registry for any
// reason (e.g., no ValueName entry exists) then return the
// default value passed into the function in *Value.
//
// Arguments:
//
// KeyPath - absolute path to registry key
// ValueName - name of the value to retrieve
// Value - in - points to a default value
// - out - points to the location for returned value
// Return Value:
//
// NTSTATUS
//
/************************************************************************/
NTSTATUS
RegGetDword(
IN PCWSTR KeyPath,
IN PCWSTR ValueName,
IN OUT PULONG Value
)
{
NTSTATUS status;
RTL_QUERY_REGISTRY_TABLE paramTable[2];
D4UAssert( KeyPath && ValueName && Value );
RtlZeroMemory( &paramTable[0], sizeof(paramTable) );
paramTable[0].Flags = RTL_QUERY_REGISTRY_DIRECT;
paramTable[0].Name = (PWSTR)ValueName; // cast away const
paramTable[0].EntryContext = Value;
paramTable[0].DefaultType = REG_DWORD;
paramTable[0].DefaultData = Value;
paramTable[0].DefaultLength = sizeof(ULONG);
// leave paramTable[1] as all zeros - this terminates the table
status = RtlQueryRegistryValues( RTL_REGISTRY_ABSOLUTE | RTL_REGISTRY_OPTIONAL,
KeyPath,
&paramTable[0],
NULL,
NULL );
TR_VERBOSE(("registry::RegGetDword - status = %x , *Value = %x\n", status, *Value));
return status;
}
/************************************************************************/
/* RegGetDeviceParameterDword */
/************************************************************************/
//
// Routine Description:
//
// - Read a DWORD value from the registry (with caller specified
// default value) given a PDO.
//
// - If we are unable to read the value from the registry for any
// reason (e.g., no ValueName entry exists) then return the
// default value passed into the function in *Value.
//
// Arguments:
//
// Pdo - PDO for which we want to read the device parameter
// ValueName - name of the value to retrieve
// Value - in - points to a default value
// - out - points to the location for returned value
// Return Value:
//
// NTSTATUS
//
/************************************************************************/
NTSTATUS
RegGetDeviceParameterDword(
IN PDEVICE_OBJECT Pdo,
IN PCWSTR ValueName,
IN OUT PULONG Value
)
{
NTSTATUS status;
HANDLE hKey;
D4UAssert( Pdo && ValueName && Value );
status = IoOpenDeviceRegistryKey( Pdo, PLUGPLAY_REGKEY_DEVICE, KEY_READ, &hKey );
if( NT_SUCCESS(status) ) {
RTL_QUERY_REGISTRY_TABLE queryTable[2];
RtlZeroMemory(&queryTable, sizeof(queryTable));
queryTable[0].Flags = RTL_QUERY_REGISTRY_DIRECT;
queryTable[0].Name = (PWSTR)ValueName; // cast away const
queryTable[0].EntryContext = Value;
queryTable[0].DefaultType = REG_DWORD;
queryTable[0].DefaultData = Value;
queryTable[0].DefaultLength = sizeof(ULONG);
status = RtlQueryRegistryValues( RTL_REGISTRY_HANDLE | RTL_REGISTRY_OPTIONAL,
hKey,
queryTable,
NULL,
NULL );
ZwClose(hKey);
TR_VERBOSE(("registry::RegGetDeviceParameterDword - status = %x , *Value = %x\n", status, *Value));
}
return status;
}