bootstrap.java

java 调用windows的api

/*
 * Bootstrap.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: Bootstrap.java,v 1.6 2004/06/14 19:51:59 arosii_moa Exp $ */

package org.jawin;

import java.io.File;

/**
 * Jawin internal class with native entry points used to bootstrap Jawin.
 * All native functions are package scoped to prevent outsiders calling them.
 * <br><br>
 * Most applications should not need to call {@link #init()} as this is 
 * automatically called from all classes containing native methods.
 * 
 * @version     $Revision: 1.6 $
 * @author      Stuart Halloway, http://www.relevancellc.com/halloway/weblog/
 */
public class Bootstrap {

	static {
		String hardLib = System.getProperty("org.jawin.hardlib");
		if (hardLib != null) {
			if (!(new File(hardLib).isAbsolute())) {
				String userDir = System.getProperty("user.dir");
				hardLib = userDir + java.io.File.separator + hardLib;
			}
			
			System.err.println("Loading jawin from hardcoded path " + hardLib);
			System.load(hardLib);
		} else {
			String libName = System.getProperty("org.jawin.lib");
			if (libName == null) {
				libName = "jawin";
			}
			System.loadLibrary(libName);
		}
		
		// init the three base interfaces.
		DispatchPtr.init(); // IDispatch
		IEnumVariant.init(); // IEnumVariant
		UnknownPtr.init(); // IUnknown
	}

	/**
	 * private constructor to avoid instantiation, as this class only contains
	 * static methods.
	 */
	private Bootstrap() {
		// never called
	}

	/** 
	 * call to initialize Jawin (work actually done in static initializer).
	 */
	public static void init() {}
	
	/*
	 * functions used by FuncPtr for managing libraries (dll's) and
	 * native exposed functions in these.
	 */
	static native int loadLibrary(String lib) throws COMException;
	static native int loadFunction(int lib, String function) throws COMException;
	static native void freeLibrary(int lib) throws COMException;
	
	/**
	 * Revokes a GIT entry. Called only by {@link org.jawin.IdentityManager} 
	 */
	static native void revokeGIT(int peer) throws COMException;

	/**
	 * Jawin caches guids under an integer token, to avoid the overhead
	 * of marshalling GUIDs back and forth
	 */
	static native int registerGUID(byte[] guid) throws COMException;
	
	/**
	 * @throws COMException if the requested interface is not supported.
	 */
	static native int queryInterface(int unknown, int guidToken) throws COMException;
	
	static native int unmarshalFromGIT(int peer, int guidToken) throws COMException;
	
	static native int marshalToGIT(int unknown, int guidToken) throws COMException;
	
	/**
	 * vtable call with no args, used for AddRef and Release
	 */
	static native int directCOM(int unknown, int vtableOffset);
}