utils.java

SWT开发的Java调用COM的工具集

/*
 * Copyright (c) 2007 Software Wizards Pty Ltd, Victoria, Australia.
 * mailto:[e-mail]. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted. See the GNU General Public License
 * for more details.
 *
 * Redistribution of the SWTtoCOM software is not permitted as part of any
 * commercial product. Licensing terms for such distribution may be
 * obtained from the copyright holder.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
package au.com.swz.swttocom.example.win32explorer.views;

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.internal.win32.OS;
import org.eclipse.swt.internal.win32.TCHAR;
import org.eclipse.swt.program.Program;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableItem;

public abstract class Utils {

	/**
	 * Returns the icon that is associated with the specified file.
	 * 
	 * @param path the file for which the associated icon is required.
	 * @return the associated image or null if no image is associated
	 *         with the specified file.
	 */
	public static Image getAssociatedImage(String path) {
		int i = path.lastIndexOf('.');
		if (i != -1) {
			String extension = path.substring(i+1);
			Program program = Program.findProgram(extension);
			if (program != null) {
				ImageData imageData = program.getImageData();
				if (imageData != null) {
					return new Image(Display.getDefault(), imageData);
				}
			}
		}
		return null;
	}

	private static final String SHELL32 = "C:\\WINDOWS\\SYSTEM32\\SHELL32.DLL";
	public static Image extractShell32Image(int nIconIndex) {
		return extractFileImage(SHELL32, nIconIndex);
	}
	
	public static Image extractFileImage(String path, int nIconIndex) {
		TCHAR lpszFile = new TCHAR (0, path, true);
		int [] phiconSmall = new int[1], phiconLarge = null;
		OS.ExtractIconEx (lpszFile, nIconIndex, phiconLarge, phiconSmall, 1);
		if (phiconSmall [0] != 0) {
			return Image.win32_new (null, SWT.ICON, phiconSmall[0]);
		}
		return null;
	}

	public static Image getKnownShell32Image(String extension) {
		if (extension.equalsIgnoreCase("TTF")) {
			return extractShell32Image(74);
		} else if (extension.equalsIgnoreCase("HTML")) {
			return extractShell32Image(13);
		}
		return null;
	}
	
	public static void main(String[] args) {
		Display display = new Display ();
		Shell shell = new Shell (display);
		final Table table = new Table (shell, SWT.BORDER | SWT.MULTI | SWT.V_SCROLL);
		int idx = 0;
		while (true) {
			Image image = extractFileImage("C:\\WINDOWS\\SYSTEM32\\SHELL32.DLL", idx);
			if (image == null) {
				break;
			}
			TableItem tableItem = new TableItem(table, SWT.NONE);
			tableItem.setText("Index " + idx);
			tableItem.setImage(image);
			idx++;
		}
		table.setBounds (0, 0, 300, 600);
		shell.pack ();
		shell.open ();
		while (!shell.isDisposed ()) {
			if (!display.readAndDispatch ()) display.sleep ();
		}
		display.dispose ();
	}
}