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16-Jul-2017 02:18

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HKEY_LOCAL_MACHINE, //HKEY "SOFTWARE\Microsoft\Windows NT\Current Version", //Key "Product Name"); //Value Name println("Windows Distribution = " value); import reflect. The correct value can be seen in the reflected Windows Preferences. This is very nasty - it involves invoking non-public methods through reflection. there's an extra semicolon in "new String Writer();;". Workaround is to call twice with both paths Java Native Access (JNA) is an excellent project for working with native libraries and has support for the Windows registry in the platform library (platform.jar) through Advapi32Util and Advapi32. Value Type; public class Fix Stuff I've incremented the Pure java code originally posted by David to allow acessing the 32-bits section of the registry from a 64-bit JVM, and vice-versa. = REG_SUCCESS) int[] info = (int[]) reg Query Info Key.invoke(root, new Object[] ); int count = info[0]; // Fix: info[2] was being used here with wrong results.

In other words, you are going outside the Preferences contract as described in the Javadocs, and this code may break any time Oracle push out a new update. Note that the read Registry method can add a second Stream Reader if you want to read the output of Error Stream(). Update: Here's a snippet with some examples of how easy it is to use JNA to work with the Windows registry using JNA 3.4.1, In my experience, LGPL licensed software can be redistributed with commercial software (GPL is much more restrictive). I don't think any of the other answers address this. Suggested by davenpcj, confirmed by Petrucio int maxlen = info[3]; // value length max for(int index=0; index Yes, using the Preferences; public class Win Registry { private static final int REG_SUCCESS = 0; private static final int REG_NOTFOUND = 2; private static final int KEY_READ = 0x20019; private static final int REG_ACCESSDENIED = 5; private static final int KEY_ALL_ACCESS = 0xf003f; public static final int HKEY_CLASSES_ROOT = 0x80000000; public static final int HKEY_CURRENT_USER = 0x80000001; public static final int HKEY_LOCAL_MACHINE = 0x80000002; private static final String CLASSES_ROOT = "HKEY_CLASSES_ROOT"; private static final String CURRENT_USER = "HKEY_CURRENT_USER"; private static final String LOCAL_MACHINE = "HKEY_LOCAL_MACHINE"; private static Preferences user Root = Root(); private static Preferences system Root = Preferences.system Root(); private static Class user Class = user Class(); private static Method reg Open Key = null; private static Method reg Close Key = null; private static Method reg Query Value Ex = null; private static Method reg Enum Value = null; private static Method reg Query Info Key = null; private static Method reg Enum Key Ex = null; private static Method reg Create Key Ex = null; private static Method reg Set Value Ex = null; private static Method reg Delete Key = null; private static Method reg Delete Value = null; static /** * Reads value for the key from given path * @param hkey HKEY_CURRENT_USER/HKEY_LOCAL_MACHINE * @param path * @param key * @return the value * @throws Illegal Argument Exception * @throws Illegal Access Exception * @throws Invocation Target Exception * @throws IOException */ public static String value For Key(int hkey, String path, String key) throws Illegal Argument Exception, Illegal Access Exception, Invocation Target Exception, IOException /** * Reads all key(s) and value(s) from given path * @param hkey HKEY_CURRENT_USER/HKEY_LOCAL_MACHINE * @param path * @return the map of key(s) and corresponding value(s) * @throws Illegal Argument Exception * @throws Illegal Access Exception * @throws Invocation Target Exception * @throws IOException */ public static Map values For Path(int hkey, String path) throws Illegal Argument Exception, Illegal Access Exception, Invocation Target Exception, IOException /** * Read all the subkey(s) from a given path * @param hkey HKEY_CURRENT_USER/HKEY_LOCAL_MACHINE * @param path * @return the subkey(s) list * @throws Illegal Argument Exception * @throws Illegal Access Exception * @throws Invocation Target Exception */ public static List sub Keys For Path(int hkey, String path) throws Illegal Argument Exception, Illegal Access Exception, Invocation Target Exception /** * Create a key * @param hkey HKEY_CURRENT_USER/HKEY_LOCAL_MACHINE * @param key * @throws Illegal Argument Exception * @throws Illegal Access Exception * @throws Invocation Target Exception */ public static void create Key(int hkey, String key) throws Illegal Argument Exception, Illegal Access Exception, Invocation Target Exception /** * Write a value in a given key/value name * @param hkey * @param key * @param value Name * @param value * @throws Illegal Argument Exception * @throws Illegal Access Exception * @throws Invocation Target Exception */ public static void write String Value(int hkey, String key, String value Name, String value) throws Illegal Argument Exception, Illegal Access Exception, Invocation Target Exception /** * Delete a given key * @param hkey * @param key * @throws Illegal Argument Exception * @throws Illegal Access Exception * @throws Invocation Target Exception */ public static void delete Key(int hkey, String key) throws Illegal Argument Exception, Illegal Access Exception, Invocation Target Exception /** * delete a value from a given key/value name * @param hkey * @param key * @param value * @throws Illegal Argument Exception * @throws Illegal Access Exception * @throws Invocation Target Exception */ public static void delete Value(int hkey, String key, String value) throws Illegal Argument Exception, Illegal Access Exception, Invocation Target Exception // ===================== private static int delete Value(Preferences root, int hkey, String key, String value) throws Illegal Argument Exception, Illegal Access Exception, Invocation Target Exception private static int delete Key(Preferences root, int hkey, String key) throws Illegal Argument Exception, Illegal Access Exception, Invocation Target Exception private static String value For Key(Preferences root, int hkey, String path, String key) throws Illegal Argument Exception, Illegal Access Exception, Invocation Target Exception, IOException private static String query Value For Key(int hkey, String path, String key) throws IOException private static Map(); int[] handles = (int[]) reg Open Key.invoke(root, new Object[] ); if (handles[1] !

Incorrectly editing your registry can stop your PC from functioning and create irreversible damage to your operating system.

In fact, one misplaced comma can prevent your PC from booting entirely!

[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Java Soft\Java Update\Policy] "Enable Java Update"=dword:00000000 "Enable Auto Update Check"=dword:00000000 "Notify Download"=dword:00000001 "Notify Install"=dword:00000001 Problem is, that DWORD Enable Java Update hide tab Update" on Java Control Panel, but I don't want to hide this tab, just unselect this checkbox.

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It also looks like JNA will be dual licensed to allow redistribution under Apache 2.0 when JNA 4.0 is released (see github.com/twall/jna/blob/master/LICENSE). It is an LGPL Java/JNI library that can do what you need. * Modified by [email protected](828681) to add support for * reading (and writing but not creating/deleting keys) the 32-bits * registry view from a 64-bits JVM (KEY_WOW64_32KEY) * and 64-bits view from a 32-bits JVM (KEY_WOW64_64KEY). In the end it depends on what you're wanting to do: storing preferences for your app is what the Preferences does just great. At the very bottom level it replaces the call to the Preference class with shelling out to the "reg query" command, but it looks enough like the accepted answer that you might not realize this right away. Method; /** * Simple registry access class implemented using some private APIs * in prefs. */ public final class Windows Registry Thank you for your interest in this question.I also tried Sysinternals Proc Monitor, but can't find place in registry where this information is stored.