demoregistry.java

java 调用windows的api

/*
 * DemoRegistry.java -
 *
 * This file is part of the Jawin Project: http://jawinproject.sourceforge.net/
 * 
 * Please consult the LICENSE file in the project root directory,
 * or at the project site before using this software.
 */

/* $Id: DemoRegistry.java,v 1.4 2004/07/02 18:45:00 arosii_moa Exp $ */

package demos;

import java.io.ByteArrayInputStream;
import java.io.IOException;

import org.jawin.COMException;
import org.jawin.FuncPtr;
import org.jawin.ReturnFlags;
import org.jawin.donated.win32.Registry;
import org.jawin.donated.win32.RegistryConstants;
import org.jawin.io.LittleEndianInputStream;
import org.jawin.io.LittleEndianOutputStream;
import org.jawin.io.NakedByteStream;

/**
 * NOTE: This demo modifies the registry.
 * <br><br>
 * This demo reads the Java Runtime Enviroment version from the registry.
 * It then adds a Jawin-key to the HKEY_LOCAL_MACHINE/SOFTWARE registry hive,
 * and deletes it again.
 *
 * @version     $Revision: 1.4 $
 * @author      Stuart Halloway, http://www.relevancellc.com/halloway/weblog/
 */
public class DemoRegistry {

	public static void deleteKey(int handle, String key) throws COMException, IOException {
		System.out.println("Deleting key " + handle + " " + key);
		Registry.DeleteKey(handle, key);
	}

	public static int createKey(int handle, String key) throws COMException, IOException {
		System.out.println("Creating key " + handle + " " + key);
		int result = Registry.CreateKey(handle, key);
		System.out.println("Created key, value is " + result);
		return result;
	}
	
	/**
	 * FIXME - remove again - made for testing the retval-handling
	 * in the GenericStub native methods.
	 */
	public static int createKey2(int handle, String key) throws COMException, IOException {
		System.out.println("Creating key2 " + handle + " " + key);
		
		FuncPtr fpCrK = new FuncPtr("ADVAPI32.DLL", "RegCreateKeyW");
		String marshal = "IGA:I:L8n4";
		NakedByteStream nbs = new NakedByteStream();
		LittleEndianOutputStream leos = new LittleEndianOutputStream(nbs);
		leos.writeInt(handle);
		leos.writeStringUnicode(key);
		
		byte[] res = fpCrK.invoke(marshal, 12, nbs, null, ReturnFlags.CHECK_W32);
		ByteArrayInputStream bais = new ByteArrayInputStream(res);
		LittleEndianInputStream leis = new LittleEndianInputStream(bais);
		leis.readInt(); //ignore return value
		int result = leis.readInt(); // the out param
		System.out.println("Created key2, value is " + result);
		return result;
	}

	public static void main(String[] args) throws Exception {
		System.out.println(
			"Accessing the registry to determine the most recent version of the JRE");
		int key =
			Registry.OpenKey(
					RegistryConstants.HKEY_LOCAL_MACHINE,
				"SOFTWARE\\JavaSoft\\Java Runtime Environment");
		System.out.println("Key opened successfully.  Handle is " + key);
		String value = Registry.QueryStringValue(key, "CurrentVersion");
		System.out.println(
			"The value of HKEY_LOCAL_MACHINE\\SOFTWARE\\JavaSoft\\Java Runtime Environment is "
				+ value);
		Registry.CloseKey(key);
		int jawinKey =
			createKey2(RegistryConstants.HKEY_LOCAL_MACHINE, "SOFTWARE\\Jawin");
//			createKey2(RegistryConstants.HKEY_CURRENT_USER, "SOFTWARE\\Jawin");
		int testkey = createKey2(jawinKey, "testsubkey");
		deleteKey(testkey, "");
		deleteKey(jawinKey, "");
	}
}