com.sun.jna.platform.win32.NtDllUtil Maven / Gradle / Ivy
/* Copyright (c) 2010 Daniel Doubrovkine, All Rights Reserved
*
* The contents of this file is dual-licensed under 2
* alternative Open Source/Free licenses: LGPL 2.1 or later and
* Apache License 2.0. (starting with JNA version 4.0.0).
*
* You can freely decide which license you want to apply to
* the project.
*
* You may obtain a copy of the LGPL License at:
*
* http://www.gnu.org/licenses/licenses.html
*
* A copy is also included in the downloadable source code package
* containing JNA, in file "LGPL2.1".
*
* You may obtain a copy of the Apache License at:
*
* http://www.apache.org/licenses/
*
* A copy is also included in the downloadable source code package
* containing JNA, in file "AL2.0".
*/
package com.sun.jna.platform.win32;
import com.sun.jna.platform.win32.Wdm.KEY_BASIC_INFORMATION;
import com.sun.jna.platform.win32.Wdm.KEY_INFORMATION_CLASS;
import com.sun.jna.platform.win32.WinReg.HKEY;
import com.sun.jna.ptr.IntByReference;
/**
* NtDll Utility API.
* @author dblock[at]dblock.org
*/
public abstract class NtDllUtil {
/**
* Retrieve the name of an opened registry key.
* @param hkey Opened registry key.
* @return Basic key name, not including node information.
*/
public static String getKeyName(HKEY hkey) {
IntByReference resultLength = new IntByReference();
int rc = NtDll.INSTANCE.ZwQueryKey(hkey, KEY_INFORMATION_CLASS.KeyBasicInformation,
null, 0, resultLength);
if (rc != NTStatus.STATUS_BUFFER_TOO_SMALL || resultLength.getValue() <= 0) {
throw new Win32Exception(rc);
}
KEY_BASIC_INFORMATION keyInformation = new KEY_BASIC_INFORMATION(
resultLength.getValue());
rc = NtDll.INSTANCE.ZwQueryKey(hkey, KEY_INFORMATION_CLASS.KeyBasicInformation,
keyInformation, resultLength.getValue(), resultLength);
if (rc != NTStatus.STATUS_SUCCESS) {
throw new Win32Exception(rc);
}
return keyInformation.getName();
}
}