OpenSoundDeviceRegKey

OpenSoundDriverParametersRegKey

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

Definition at line 71 of file registry.c.

Referenced by EnumerateNt4ServiceSoundDevices().

{
    DWORD 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;
}

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