Patch for Ken Ryall - 186436 - add getLocalMachineKeyName() native method.

core/org.eclipse.cdt.core.win32/library/winreg/winreg.cpp

@@ -78,3 +78,43 @@ JNIEXPORT jstring JNICALL Java_org_eclipse_cdt_utils_WindowsRegistry_getLocalMac
 
 	return result;
 }
+
+/*
+ * Given a subkey (string) under HKEY_LOCAL_MACHINE, and an index (starting from 0)
+ * to the key's array of keys, return the name of the indexed key. 
+ * The return value is null on any error or when the index is invalid.
+ */
+ 
+extern "C"
+JNIEXPORT jstring JNICALL Java_org_eclipse_cdt_utils_WindowsRegistry_getLocalMachineKeyName(
+	JNIEnv * env, jobject obj, jstring subkey, jint index)
+{
+	const jchar * csubkey = env->GetStringChars(subkey, NULL);
+	jstring 	result = NULL;
+
+	HKEY key;
+	LONG rc = RegOpenKeyEx(HKEY_LOCAL_MACHINE, (const wchar_t *)csubkey, 0, KEY_READ, &key);
+	if (rc != ERROR_SUCCESS)
+		return NULL;
+	
+	wchar_t keyName[256];
+	DWORD 	nameSize = sizeof(keyName) + 2;
+	
+	rc = RegEnumKeyEx(key, index, 
+			keyName, 		// UNICODE string
+			&nameSize,
+			NULL, NULL,
+			NULL,
+			NULL);			// size in BYTE of data.
+	
+	if (rc == ERROR_SUCCESS)
+	{
+		result = env->NewString((jchar *)keyName, nameSize);
+	}
+	
+	RegCloseKey(key);
+	
+	env->ReleaseStringChars(subkey, csubkey);
+
+	return result;
+}

core/org.eclipse.cdt.core/utils/org/eclipse/cdt/utils/WindowsRegistry.java

@@ -65,5 +65,17 @@ public class WindowsRegistry {
 	 * @return name of registry value or null if not found
 	 */
 	public native String getLocalMachineValueName(String subkey, int index);
+	
+	/**
+	 * Given a subkey of HKEY_LOCAL_MACHINE, and an index (starting from 0)
+	 * to the key's array of sub keys, return the name of the indexed key. 
+	 * The return value is null on any error or when the index is invalid.
+	 * The key name can be used in the above getLocalMachineValueName()
+	 * to retrieve value names.
+	 * @param subkey   subkey of HKEY_LOCAL_MACHINE
+	 * @param index    index to the subkey's array of values, starting from 0. 
+	 * @return name of registry value or null if not found
+	 */
+	public native String getLocalMachineKeyName(String subkey, int index);
 
 }