helpmanager.java

java 调用windows的api

package org.jawin.browser.help;

import org.jawin.browser.log.Log;
import java.io.File;

/**
 * Manages showing hh.exe help files, perhaps other help systems could be added?
 *
 * <p>Title: Jawin Code Generation GUI</p>
 * <p>Description: GUI for exploring type libraries and generating Java code</p>
 * <p>Copyright: Copyright (c) 2003</p>
 * <p>Company: Open Source Incentive</p>
 *
 * @author Josh Passenger
 * @version 1.0
 */

public class HelpManager
{

	private static HelpManager instance = null;

	private HelpManager()
	{
	}

	public static synchronized void initialize()
	{
		instance = new HelpManager();
	}

	public static HelpManager getInstance()
	{
		if (instance == null)
		{
			throw new IllegalStateException("HelpManager.getInstance() HelpManager was not initialized");
		}

		return instance;
	}

	/**
	 * Add other types of help if required
	 *
	 * @param helpFile
	 * @param helpIndex
	 */
	public void showHelp(String helpFile, int helpIndex)
	{
		String helpFileLower = helpFile.toLowerCase();

		if (helpFileLower.endsWith(".chm"))
		{
			showHtmlHelp(helpFile, helpIndex);
		}
		else if (helpFileLower.endsWith(".hlp"))
		{
			showWinHelp(helpFile, helpIndex);
		}

	}

	private void showHtmlHelp(String helpFile, int helpIndex)
	{
		StringBuffer buffer = new StringBuffer();

		buffer.append("hh ");

		if (helpIndex != 0)
		{
			buffer.append("-mapid ");
			buffer.append(helpIndex);
			buffer.append(" ");
		}

		if (helpFile.indexOf(' ') > -1)
		{
			buffer.append("\"");
			buffer.append(helpFile);
			buffer.append("\" ");
		}
		else
		{
			buffer.append(helpFile);
		}

		try
		{
			Runtime.getRuntime().exec(buffer.toString());
		}
		catch (Exception e)
		{
			Log.getInstance().exception("HelpManager.showHtmlHelp() failed to show help", e);
		}
	}

	private void showWinHelp(String helpFile, int helpIndex)
	{
		StringBuffer buffer = new StringBuffer();

		buffer.append("winhlp32 ");

		if (helpFile.indexOf(' ') > -1)
		{
			buffer.append("\"");
			buffer.append(helpFile);
			buffer.append("\" ");
		}
		else
		{
			buffer.append(helpFile);
		}

		try
		{
			Runtime.getRuntime().exec(buffer.toString());
		}
		catch (Exception e)
		{
			Log.getInstance().exception("HelpManager.showWinHelp() failed to show help", e);
		}
	}
}