1 /*
   2  * Copyright (c) 2008, 2009, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 #include <windows.h>
  27 
  28 #include "jni.h"
  29 #include "jni_util.h"
  30 #include "jlong.h"
  31 
  32 #include "sun_nio_fs_RegistryFileTypeDetector.h"
  33 
  34 
  35 JNIEXPORT jstring JNICALL
  36 Java_sun_nio_fs_RegistryFileTypeDetector_queryStringValue(JNIEnv* env, jclass this,
  37     jlong keyAddress, jlong nameAddress)
  38 {
  39     LPCWSTR lpSubKey= (LPCWSTR)jlong_to_ptr(keyAddress);
  40     LPWSTR lpValueName = (LPWSTR)jlong_to_ptr(nameAddress);
  41     LONG res;
  42     HKEY hKey;
  43     jstring result = NULL;
  44 
  45     res = RegOpenKeyExW(HKEY_CLASSES_ROOT, lpSubKey, 0, KEY_READ, &hKey);
  46     if (res == ERROR_SUCCESS) {
  47         DWORD type;
  48         BYTE data[255];
  49         DWORD size = sizeof(data);
  50 
  51         res = RegQueryValueExW(hKey, lpValueName, NULL, &type, (LPBYTE)&data, &size);
  52         if (res == ERROR_SUCCESS) {
  53             if (type == REG_SZ) {
  54                 jsize len = (jsize)wcslen((WCHAR*)data);
  55                 result = (*env)->NewString(env, (const jchar*)&data, len);
  56             }
  57         }
  58 
  59         RegCloseKey(hKey);
  60     }
  61     return result;
  62 }