oshi.hardware.platform.windows.WindowsDisplay Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of oshi-core Show documentation
There is a newer version: 6.6.4
/**
 * MIT License
 *
 * Copyright (c) 2010 - 2020 The OSHI Project Contributors: https://github.com/oshi/oshi/graphs/contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package oshi.hardware.platform.windows;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

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

import com.sun.jna.platform.win32.Advapi32; // NOSONAR squid:S1191
import com.sun.jna.platform.win32.Guid;
import com.sun.jna.platform.win32.SetupApi;
import com.sun.jna.platform.win32.SetupApi.SP_DEVICE_INTERFACE_DATA;
import com.sun.jna.platform.win32.SetupApi.SP_DEVINFO_DATA;
import com.sun.jna.platform.win32.WinBase;
import com.sun.jna.platform.win32.WinError;
import com.sun.jna.platform.win32.WinNT;
import com.sun.jna.platform.win32.WinReg.HKEY;
import com.sun.jna.ptr.IntByReference;

import oshi.annotation.concurrent.Immutable;
import oshi.hardware.Display;
import oshi.hardware.common.AbstractDisplay;

/**
 * A Display
 */
@Immutable
final class WindowsDisplay extends AbstractDisplay {

    private static final Logger LOG = LoggerFactory.getLogger(WindowsDisplay.class);

    private static final SetupApi SU = SetupApi.INSTANCE;
    private static final Advapi32 ADV = Advapi32.INSTANCE;

    private static final Guid.GUID GUID_DEVINTERFACE_MONITOR = new Guid.GUID("E6F07B5F-EE97-4a90-B076-33F57BF4EAA7");

    /**
     * Constructor for WindowsDisplay.
     *
     * @param edid
     *            a byte array representing a display EDID
     */
    WindowsDisplay(byte[] edid) {
        super(edid);
        LOG.debug("Initialized WindowsDisplay");
    }

    /**
     * Gets Display Information
     *
     * @return An array of Display objects representing monitors, etc.
     */
    public static List getDisplays() {
        List displays = new ArrayList<>();

        WinNT.HANDLE hDevInfo = SU.SetupDiGetClassDevs(GUID_DEVINTERFACE_MONITOR, null, null,
                SetupApi.DIGCF_PRESENT | SetupApi.DIGCF_DEVICEINTERFACE);
        if (!hDevInfo.equals(WinBase.INVALID_HANDLE_VALUE)) {
            SP_DEVICE_INTERFACE_DATA deviceInterfaceData = new SetupApi.SP_DEVICE_INTERFACE_DATA();
            deviceInterfaceData.cbSize = deviceInterfaceData.size();

            // build a DevInfo Data structure
            SP_DEVINFO_DATA info = new SetupApi.SP_DEVINFO_DATA();

            for (int memberIndex = 0; SU.SetupDiEnumDeviceInfo(hDevInfo, memberIndex, info); memberIndex++) {
                HKEY key = SU.SetupDiOpenDevRegKey(hDevInfo, info, SetupApi.DICS_FLAG_GLOBAL, 0, SetupApi.DIREG_DEV,
                        WinNT.KEY_QUERY_VALUE);

                byte[] edid = new byte[1];

                IntByReference pType = new IntByReference();
                IntByReference lpcbData = new IntByReference();

                if (ADV.RegQueryValueEx(key, "EDID", 0, pType, edid, lpcbData) == WinError.ERROR_MORE_DATA) {
                    edid = new byte[lpcbData.getValue()];
                    if (ADV.RegQueryValueEx(key, "EDID", 0, pType, edid, lpcbData) == WinError.ERROR_SUCCESS) {
                        Display display = new WindowsDisplay(edid);
                        displays.add(display);
                    }
                }
                Advapi32.INSTANCE.RegCloseKey(key);
            }
            SU.SetupDiDestroyDeviceInfoList(hDevInfo);
        }
        return Collections.unmodifiableList(displays);
    }
}