WindowsRuntimeUtil.java

/*
 * This file is part of VLCJ.
 *
 * VLCJ is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * VLCJ is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with VLCJ.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Copyright 2009-2016 Caprica Software Limited.
 */

package uk.co.caprica.vlcj.runtime.windows;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.sun.jna.platform.win32.Advapi32Util;
import com.sun.jna.platform.win32.WinReg;

/**
 * Windows specific run-time utilities.
 */
public final class WindowsRuntimeUtil {

    /**
     * Log.
     */
    private static final Logger logger = LoggerFactory.getLogger(WindowsRuntimeUtil.class);

    /**
     * The VLC registry key, under HKLM.
     */
    public static final String VLC_REGISTRY_KEY = "SOFTWARE\\VideoLAN\\VLC";

    /**
     * The VLC registry key for the installation directory.
     */
    public static final String VLC_INSTALL_DIR_KEY = "InstallDir";

    /**
     * Prevent direct instantiation by others.
     */
    private WindowsRuntimeUtil() {
    }

    /**
     * Get the VLC installation directory.
     * <p>
     * If vlc is installed correctly, this should not be needed.
     *
     * @return fully-qualified directory name, or <code>null</code> if the value could not be obtained
     */
    public static String getVlcInstallDir() {
        logger.debug("getVlcInstallDir()");
        try {
            return Advapi32Util.registryGetStringValue(WinReg.HKEY_LOCAL_MACHINE, VLC_REGISTRY_KEY, VLC_INSTALL_DIR_KEY);
        }
        catch(Exception e) {
            logger.warn("Failed to get VLC installation directory from the registry", e);
            return null;
        }
    }
}