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