deleting key from windows registry

Posted on 2002-05-25
Last Modified: 2012-05-04
Can any one help me out with JNI code snippet to delete the key from windows registry. Key is set in,
HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Control\\Session Manager\\Environment

Question by:vibhav
LVL 86

Expert Comment

ID: 7034607
Have you looked for classes or other MS java classes on your machine? You might well be able to find the classes that are for the registry.
LVL 92

Expert Comment

ID: 7034880

Author Comment

ID: 7035205
to objects:

I need simple delete function in has lot of feature and bit confusing in th link u provided.
LVL 92

Expert Comment

ID: 7035988
Just extract the delete functionality if that's all you want. I doubt you'll find anything that *just* does delete.

Accepted Solution

AndrewRodionov earned 100 total points
ID: 7036540
Hi vibhav,

Here is a little sample demonstrates how to delete Windows registry values using JNI:
class JNIRegDelSample
  private native int deleteRegValue( String key, String subkey, String value );
  public static void main( String[] args )
    String key = "HKEY_LOCAL_MACHINE";
    String subkey =
      "SYSTEM\\CurrentControlSet\\Control\\Session Manager\\Environment";
    String value = "TEST";
    JNIRegDelSample sample = new JNIRegDelSample();
    System.out.println( sample.deleteRegValue( key, subkey, value ) );
  static {
    System.loadLibrary( "delreg" );

/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class JNIRegDelSample */

#ifndef _Included_JNIRegDelSample
#define _Included_JNIRegDelSample
#ifdef __cplusplus
extern "C" {
 * Class:     JNIRegDelSample
 * Method:    deleteRegValue
 * Signature: (Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)I
JNIEXPORT jint JNICALL Java_JNIRegDelSample_deleteRegValue
  (JNIEnv *, jobject, jstring, jstring, jstring);

#ifdef __cplusplus

#include <string.h>
#include <windows.h>

#include "JNIRegDelSample.h"

jint JNICALL Java_JNIRegDelSample_deleteRegValue
( JNIEnv *env, jobject obj, jstring key, jstring subkey, jstring value )
  const char *pszKey = (*env)->GetStringUTFChars( env, key, 0 );
  const char *pszSubKey = (*env)->GetStringUTFChars( env, subkey, 0 );
  const char *pszValue = (*env)->GetStringUTFChars( env, value, 0 );
  HKEY hkey = NULL;
  HKEY hRoot = NULL;
  LONG lResult;

  if ( strcmp( pszKey, "HKEY_CLASSES_ROOT" ) == 0 ) {
  } else if ( strcmp( pszKey, "HKEY_CURRENT_CONFIG" ) == 0 ) {
  } else if ( strcmp( pszKey, "HKEY_CURRENT_USER" ) == 0 ) {
  } else if ( strcmp( pszKey, "HKEY_LOCAL_MACHINE" ) == 0 ) {
  } else if ( strcmp( pszKey, "HKEY_USERS" ) == 0 ) {
    hRoot = HKEY_USERS;
  } else {
    return -1;
  lResult = RegOpenKeyEx( hRoot, pszSubKey, 0L, KEY_SET_VALUE, &hkey );
  if ( lResult == ERROR_SUCCESS ) {
    RegDeleteValue( hkey, pszValue );
    RegCloseKey( hkey );
  return lResult;

Your steps:
1) javac
2) javah JNIRegDelSample
3) cl -I%JAVA_HOME%\include -I%JAVA_HOME%\include\win32 -LD advapi32.lib delreg.c -Fedelreg.dll

Note that for the step 3) you should setup VC vars (run something like "C:\Program Files\Microsoft Visual Studio\VC98\Bin\VCVARS32.BAT").

Ask me more if you need.
Regards, Andrew.

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