registry.c File Reference

#include "precomp.h"
#include <mmebuddy_debug.h>

Include dependency graph for registry.c:

Go to the source code of this file.

Functions
MMRESULT	OpenSoundDriverParametersRegKey (IN LPWSTR ServiceName, OUT PHKEY KeyHandle)
MMRESULT	OpenSoundDeviceRegKey (IN LPWSTR ServiceName, IN DWORD DeviceIndex, OUT PHKEY KeyHandle)

Function Documentation

OpenSoundDeviceRegKey()

MMRESULT OpenSoundDeviceRegKey	(	IN LPWSTR	ServiceName,
		IN DWORD	DeviceIndex,
		OUT PHKEY	KeyHandle
	)

Definition at line 73 of file registry.c.

{
    SIZE_T PathLength;
    PWCHAR RegPath;

    VALIDATE_MMSYS_PARAMETER( ServiceName );
    VALIDATE_MMSYS_PARAMETER( KeyHandle );

    /*
        Work out the space required to hold the path:

        HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\
            sndblst\
                Parameters\
                    Device123\
    */
    PathLength = wcslen(REG_SERVICES_KEY_NAME_U) + 1
               + wcslen(ServiceName) + 1
               + wcslen(REG_PARAMETERS_KEY_NAME_U) + 1
               + wcslen(REG_DEVICE_KEY_NAME_U)
               + GetDigitCount(DeviceIndex);

    /* Allocate storage for the string */
    RegPath = AllocateWideString(PathLength);

    if ( ! RegPath )
    {
        return MMSYSERR_NOMEM;
    }

    /* Write the path */
    wsprintf(RegPath,
             L"%ls\\%ls\\%ls\\%ls%d",
             REG_SERVICES_KEY_NAME_U,
             ServiceName,
             REG_PARAMETERS_KEY_NAME_U,
             REG_DEVICE_KEY_NAME_U,
             DeviceIndex);

    SND_TRACE(L"Opening reg key: %wS\n", RegPath);

    /* Perform the open */
    if ( RegOpenKeyEx(HKEY_LOCAL_MACHINE,
                      RegPath,
                      0,
                      KEY_READ,
                      KeyHandle) != ERROR_SUCCESS )
    {
        /* Couldn't open the key */
        SND_ERR(L"Failed to open reg key: %wS\n", RegPath);
        FreeMemory(RegPath);
        return MMSYSERR_ERROR;
    }

    FreeMemory(RegPath);

    return MMSYSERR_NOERROR;
}

Referenced by EnumerateNt4ServiceSoundDevices().

OpenSoundDriverParametersRegKey()

MMRESULT OpenSoundDriverParametersRegKey	(	IN LPWSTR	ServiceName,
		OUT PHKEY	KeyHandle
	)

Definition at line 20 of file registry.c.

{
    SIZE_T KeyLength;
    PWCHAR ParametersKeyName;

    VALIDATE_MMSYS_PARAMETER( ServiceName );
    VALIDATE_MMSYS_PARAMETER( KeyHandle );

    /* Work out how long the string will be */
    KeyLength = wcslen(REG_SERVICES_KEY_NAME_U) + 1
              + wcslen(ServiceName) + 1
              + wcslen(REG_PARAMETERS_KEY_NAME_U);

    /* Allocate memory for the string */
    ParametersKeyName = AllocateWideString(KeyLength);

    if ( ! ParametersKeyName )
        return MMSYSERR_NOMEM;

    /* Construct the registry path */
    wsprintf(ParametersKeyName,
             L"%s\\%s\\%s",
             REG_SERVICES_KEY_NAME_U,
             ServiceName,
             REG_PARAMETERS_KEY_NAME_U);

    SND_TRACE(L"Opening reg key: %wS\n", ParametersKeyName);

    /* Perform the open */
    if ( RegOpenKeyEx(HKEY_LOCAL_MACHINE,
                      ParametersKeyName,
                      0,
                      KEY_READ,
                      KeyHandle) != ERROR_SUCCESS )
    {
        /* Couldn't open the key */
        SND_ERR(L"Failed to open reg key: %wS\n", ParametersKeyName);
        FreeMemory(ParametersKeyName);
        return MMSYSERR_ERROR;
    }

    FreeMemory(ParametersKeyName);

    return MMSYSERR_NOERROR;
}