win32uienhancer.java

java 文件下载器。可自定义

// Decompiled by Jad v1.5.8e2. Copyright 2001 Pavel Kouznetsov.
// Jad home page: http://kpdus.tripod.com/jad.html
// Decompiler options: packimports(3) fieldsfirst ansi space 
// Source File Name:   Win32UIEnhancer.java

package org.gudy.azureus2.ui.swt.win32;

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;

public class Win32UIEnhancer
{

	public Win32UIEnhancer()
	{
	}

	static String findProgramKey(String extension)
	{
		if (extension == null)
			SWT.error(4);
		if (extension.length() == 0)
			return null;
		if (extension.charAt(0) != '.')
			extension = (new StringBuilder()).append(".").append(extension).toString();
		TCHAR key = new TCHAR(0, extension, true);
		int phkResult[] = new int[1];
		if (OS.RegOpenKeyEx(0x80000000, key, 0, 0x20019, phkResult) != 0)
			return null;
		int lpcbData[] = new int[1];
		int result = OS.RegQueryValueEx(phkResult[0], null, 0, null, (TCHAR)null, lpcbData);
		if (result == 0)
		{
			TCHAR lpData = new TCHAR(0, lpcbData[0] / TCHAR.sizeof);
			result = OS.RegQueryValueEx(phkResult[0], null, 0, null, lpData, lpcbData);
			if (result == 0)
				return lpData.toString(0, lpData.strlen());
		}
		OS.RegCloseKey(phkResult[0]);
		return null;
	}

	public static ImageData getBigImageData(String extension)
	{
		String key = findProgramKey(extension);
		if (key == null)
			return null;
		String DEFAULT_ICON = "\\DefaultIcon";
		String iconName = getKeyValue((new StringBuilder()).append(key).append(DEFAULT_ICON).toString(), true);
		if (iconName == null)
			iconName = "";
		int nIconIndex = 0;
		String fileName = iconName;
		int index = iconName.indexOf(',');
		if (index != -1)
		{
			fileName = iconName.substring(0, index);
			String iconIndex = iconName.substring(index + 1, iconName.length()).trim();
			try
			{
				nIconIndex = Integer.parseInt(iconIndex);
			}
			catch (NumberFormatException e) { }
		}
		TCHAR lpszFile = new TCHAR(0, fileName, true);
		int phiconSmall[] = null;
		int phiconLarge[] = new int[1];
		OS.ExtractIconEx(lpszFile, nIconIndex, phiconLarge, phiconSmall, 1);
		if (phiconLarge[0] == 0)
		{
			return null;
		} else
		{
			Image image = Image.win32_new(null, 1, phiconLarge[0]);
			ImageData imageData = image.getImageData();
			image.dispose();
			return imageData;
		}
	}

	static String getKeyValue(String string, boolean expand)
	{
		TCHAR key = new TCHAR(0, string, true);
		int phkResult[] = new int[1];
		if (OS.RegOpenKeyEx(0x80000000, key, 0, 0x20019, phkResult) != 0)
			return null;
		String result = null;
		int lpcbData[] = new int[1];
		if (OS.RegQueryValueEx(phkResult[0], (TCHAR)null, 0, null, (TCHAR)null, lpcbData) == 0)
		{
			result = "";
			int length = lpcbData[0] / TCHAR.sizeof;
			if (length != 0)
			{
				TCHAR lpData = new TCHAR(0, length);
				if (OS.RegQueryValueEx(phkResult[0], null, 0, null, lpData, lpcbData) == 0)
					if (!OS.IsWinCE && expand)
					{
						length = OS.ExpandEnvironmentStrings(lpData, null, 0);
						if (length != 0)
						{
							TCHAR lpDst = new TCHAR(0, length);
							OS.ExpandEnvironmentStrings(lpData, lpDst, length);
							result = lpDst.toString(0, Math.max(0, length - 1));
						}
					} else
					{
						length = Math.max(0, lpData.length() - 1);
						result = lpData.toString(0, length);
					}
			}
		}
		if (phkResult[0] != 0)
			OS.RegCloseKey(phkResult[0]);
		return result;
	}
}