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134 lines
3.4 KiB
C
134 lines
3.4 KiB
C
/*
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* PROJECT: ReactOS Sound System "MME Buddy" NT4 Library
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* LICENSE: GPL - See COPYING in the top level directory
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* FILE: lib/drivers/sound/mment4/registry.c
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*
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* PURPOSE: Registry operation helper for audio device drivers.
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*
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* PROGRAMMERS: Andrew Greenwood (silverblade@reactos.org)
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*/
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#include "precomp.h"
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#include <mmebuddy_debug.h>
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/*
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Open the parameters key of a sound driver.
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NT4 only.
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*/
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MMRESULT
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OpenSoundDriverParametersRegKey(
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IN LPWSTR ServiceName,
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OUT PHKEY KeyHandle)
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{
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SIZE_T KeyLength;
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PWCHAR ParametersKeyName;
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VALIDATE_MMSYS_PARAMETER( ServiceName );
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VALIDATE_MMSYS_PARAMETER( KeyHandle );
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/* Work out how long the string will be */
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KeyLength = wcslen(REG_SERVICES_KEY_NAME_U) + 1
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+ wcslen(ServiceName) + 1
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+ wcslen(REG_PARAMETERS_KEY_NAME_U);
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/* Allocate memory for the string */
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ParametersKeyName = AllocateWideString(KeyLength);
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if ( ! ParametersKeyName )
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return MMSYSERR_NOMEM;
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/* Construct the registry path */
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wsprintf(ParametersKeyName,
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L"%s\\%s\\%s",
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REG_SERVICES_KEY_NAME_U,
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ServiceName,
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REG_PARAMETERS_KEY_NAME_U);
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SND_TRACE(L"Opening reg key: %wS\n", ParametersKeyName);
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/* Perform the open */
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if ( RegOpenKeyEx(HKEY_LOCAL_MACHINE,
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ParametersKeyName,
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0,
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KEY_READ,
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KeyHandle) != ERROR_SUCCESS )
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{
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/* Couldn't open the key */
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SND_ERR(L"Failed to open reg key: %wS\n", ParametersKeyName);
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FreeMemory(ParametersKeyName);
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return MMSYSERR_ERROR;
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}
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FreeMemory(ParametersKeyName);
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return MMSYSERR_NOERROR;
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}
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/*
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Open one of the Device sub-keys belonging to the sound driver.
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NT4 only.
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*/
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MMRESULT
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OpenSoundDeviceRegKey(
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IN LPWSTR ServiceName,
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IN DWORD DeviceIndex,
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OUT PHKEY KeyHandle)
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{
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SIZE_T PathLength;
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PWCHAR RegPath;
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VALIDATE_MMSYS_PARAMETER( ServiceName );
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VALIDATE_MMSYS_PARAMETER( KeyHandle );
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/*
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Work out the space required to hold the path:
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HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\
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sndblst\
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Parameters\
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Device123\
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*/
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PathLength = wcslen(REG_SERVICES_KEY_NAME_U) + 1
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+ wcslen(ServiceName) + 1
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+ wcslen(REG_PARAMETERS_KEY_NAME_U) + 1
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+ wcslen(REG_DEVICE_KEY_NAME_U)
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+ GetDigitCount(DeviceIndex);
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/* Allocate storage for the string */
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RegPath = AllocateWideString(PathLength);
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if ( ! RegPath )
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{
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return MMSYSERR_NOMEM;
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}
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/* Write the path */
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wsprintf(RegPath,
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L"%ls\\%ls\\%ls\\%ls%d",
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REG_SERVICES_KEY_NAME_U,
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ServiceName,
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REG_PARAMETERS_KEY_NAME_U,
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REG_DEVICE_KEY_NAME_U,
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DeviceIndex);
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SND_TRACE(L"Opening reg key: %wS\n", RegPath);
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/* Perform the open */
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if ( RegOpenKeyEx(HKEY_LOCAL_MACHINE,
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RegPath,
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0,
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KEY_READ,
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KeyHandle) != ERROR_SUCCESS )
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{
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/* Couldn't open the key */
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SND_ERR(L"Failed to open reg key: %wS\n", RegPath);
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FreeMemory(RegPath);
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return MMSYSERR_ERROR;
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}
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FreeMemory(RegPath);
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return MMSYSERR_NOERROR;
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}
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