CryptableApps

CryptableApps is an attempt to overcome some of the shortcomings of the PortableApps platform.  While PortableApps generally kicks ass, there are two issues that people are always asking about on the forum:

• password protection of the drive
• automatically launching applications from the PortableApps menu on insertion

It is my hope that this application will address these concerns and allow people holding onto U3 for these purposes to ditch U3 and embrace the far superior PortableApps system.

CryptableApps accomplishes this by use of TrueCrypt in traveler mode to mount an encrypted file, from which PortableApps is then run.  You must have administrator privileges to do this.  This is a limitation of the CryptableApps solution that may prevent you from using it in certain locations such as libraries or internet kiosks.  However, you can certainly keep as many applications as you like on the primary drive and run them from there if you do not have admin privileges on a given machine.  There have been some criticisms of TrueCrypt on the PortableApps forums, but in my opinion, TrueCrypt provides far better security than U3 and any truly encrypted partition will require admin privileges to run.  The traces TrueCrypt leaves in the registry are not significant- they will merely let someone know that TrueCrypt was run.
You can download CryptableApps here

Fixing MP3 Offsets

When using Windows, my cd ripper of choice is CDEX, which does a very nice job. Recently I was trying to convert some audio books to MP3 to listen to on my iPod. One nice feature CDEX is supposed to have, is a track offset setting. So if I want to have disk 2 have the same album and artist name as disk 1, I can set an offset so that I don't have two songs labeled "track 1", which would confuse the heck out of my iPod

Unfortunately, that feature fails to write the offset track number to the ID3 tag.

Perl to the Rescue!

introducing pspVo!

Okay, since I've closed the doors over at handX.net, I guess I'll have to start attending to the geekstuff section of this website again. But with a redesign pending, I'll post this to here for now.

If you have a TiVo with TiVo to go, and a PSP, it's probably occurred to you more than once that it would be nifty to transfer tv shows from your TiVo to your PSP. You might have even installed psp video 9, which does a fine job of converting shows on the fly. But if you have a daily trainride as I do, it might have occured to you that it would be nice to set up a scheduled job to convert a tv show automatically. Well, it's now possible.

This is a little Perl script that can be edited and scheduled to copy your programs for you. It takes some work, if you don't know how to install Perl, find out your TiVo's IP address, or how to type in the path to FFMPeg or what the path to your PSP's video folder is, you should probably do yourself a favor and just give up now- this tool is not for you. But if you're cool with that, and can figure out how to install FFMPeg and AviSynth (here's a hint- install psp video 9) then download it and give it a shot. I won't be providing any support for this, it's use at your own risk and figure out how to get it to work yourself software. That being said, have fun with it. And if you figure out a way to make it better, please let me know.

handX pInstaller now has a new home

pInstaller is a Free, Open Source installer written in Delphi 7. While pInstaller is powerful enough to be used as a general purpose installer, it was designed with the PalmOS developer in mind. It includes facilities that make it easy to install PalmOS applications and conduits.

If you've installed handX webLog, Lingo or corpLink or even our hXPiCS Demo, you've seen the pInstaller in action.

You can freely download pInstaller and use it to build your own installation packages.

You can call this progam from within one of the normal install builders like InstallShield or Wise, or you can simply create a self extracting executable containing "pInstaller.exe" to install conduits, Palm files, or basic Windows programs.

pInstaller uses a simple file that details the conduit settings and Palm applications to install, and what file to run after nstallation (if any). You can specify required or optional files to be installed on the PC or on Palm Devices registered with HotSync. It also allows you to generate registry settings in the Hive that your conduit has been installed into (e.g HKEY_CURRENT_USER\Software\U.S. Robotics\Pilot Desktop\Application5). pInstaller will even generate an uninstall entry with Windows.

handX pInstaller is no longer being actively developed, which is why it now resides here. If you are interested in taking over maintenance of the code, let me know.

You can download pInstaller and it's source code here.

Documentation is here

pInstaller Construction Set Demo

hXpICS is designed to take the hassle out of creating an installation package for your PalmOS application and conduit. A easy to use interface walks you through the process of creating a self extracting package that you can distribute. A complete help file documents each step of the process. hXpICS is powerful enough to be used as an installer for your Windows packages as well

While hXpICS is no longer being actively developed, I have put it back on sale after many requests to do so

Five cows think our product is nifty.

I believe that our pInstaller Construction Set is the best way to create a Palm Installation package. But since I'm not the guy you probably want to trust on this, you might be interested that it recieved a coveted five cow rating from tucows. And it's offered at the remarkable price of just US$75 ($50 upgrade for Conduit Installer Wizard customers). But I don't expect you to take our word on the value of this product. Download the demo now to see if it meets your needs, then purchase the full version to create a distributable package.

Checking palm user ID/passwords from a Delphi App

If you ever have a need to check a palm user ID/password from the PC side, Palm provided a static library(.lib) for doing so. Unfortunately, you can't use that static library from Delphi. I've taken the static library and compiled it into a dll which can be called from Delphi. That dll and the Delphi source for a simple example are available here. This dll is provided for any use whatsoever without any warantee whatsoever. It has only been tested using HotSync 4, and if Palm ever changes the way passwords are handles (as they are rumored to do soon) this is unlikely to work.

As a generally useful note, the process for building a DLL from a static library is pretty simple if you have access to the Visual C++ command line tools lib and link. Here are the commands used to build the dll:

lib.exe c:\temp\PWD5.lib /extract:.\Release\PASSWORD.OBJ /out:c:\temp\hXpwd5.obj

link.exe /EXPORT:PwdVerify /DLL c:\temp\hXpwd5.obj

Screen Saver Source

If you are a Delphi programmer and want to write screen savers for Windows 95, this page should help you. You can download the source code to a screen saver written in Delphi, published under the GNU Public License. What this means to you is that you can download the source, modify it to make your own screen saver and even sell that screen saver.

There is a catch though. First of all, you have to send your source code back to me. Second of all, you must license your screen saver under the GPL, and freely share your source code with anyone who asks. This may sound a little weird, but if you don't like it, don't download the code.

This licensing is new to most Windows programmers, but it's been working for years in the Linux community, and many amazing applications are licensed under the GPL.

The compressed file includes a file called HOWTO.txt which describes the process of modifying the source code. In most cases, it's simply a matter of creating a resource file with a sprite and mask, modifying a few constants, then changing the configuration form to show what you want it to. Of course, given the source code, you can also modify it to be completely unique.

Download the source code here Download the screen saver for installation here

Rag-A-Das is the name of a B24 liberator that my grandfather flew in (as a mid-waist gunner in World War II. You can see the nose art from that plane above. He has recently been using prodigy and the internet to meet other people who shared similar experiences during the war. I wrote the Rag-A-Das screen saver for him to run on his computer and share with his online friends.

If you are interested in information about B-24 Veterans on the internet, I recommend that you check out the B-24 Veterans Group web site. For more information on the B-24, check out The Pueblo Historical Aircraft Society B-24 Museum page.

You can download a ShareWare copy of RAG-A-DAS Screen Saver. The file you download is a self extracting executable.

To use it, copy the downloaded file, RAGADAS.EXE, onto a blank floppy disk. From a Dos prompt select that drive and type RAGADAS. Or, from Windows file manager or explorer, double click on the file RAGADAS.EXE.

When you are finished with this process, Go to the file menu in Windows (Start Button in Win 95) and select Run. Type D:.EXE, where D is the name of the floppy drive. For example, to run it from the A drive type A:SETUP.EXE. The setup program will install the necessary files, ask you if you wish to set RAG-A-DAS as your default screen saver, and if you'd like to install icon based shortcuts to it. When you are done this, setup will prompt you to enter registration information or continue unregistered. That's it.

Because no geek section would be complete without a reference to everyone's favorite number

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3

note:
this page is amazingly outdated- much of the code shown won't even run in a modern browser, but it amuses me to keep it here.

so there.

i*net Programming

Introduction

The internet is the fastest growth area in computing. The promise of browsers is the distribution of applications across platforms ranging from high end UNIX workstations, Macintoshes, Wintel PCs, or even low cost browser appliances. This promise has driven organizations throughout the world to develop applications for the internet. Many companies have created internal internets, known as intranets or extranets, depending on the access that they provide to the outside world. Collectively, these systems are referred to as i*net technologies.

There are many options available for programming for the internet. CGI, JavaScript, VBScript, ActiveX and Java are all technologies that can be used to create dynamic HTML pages for distribution over the World Wide Web. I was curious to explore these languages, so I set out to create an application in all of them.

Before I could begin, I had to select an application to write. I decided that to fully compare the languages, I should try to write the same program in each language. As ActiveX is not a language, I chose to use Delphi (the language I generally use for Windows application programming) to generate my ActiveX object. I ended up deciding to write a pregnancy due date calculator. This application allows me to work with dates, calculations, and graphics. It was also an attempt to appease my pregnant wife for the hours I knew I would spend building this page.

The application was to have 3 drop down selection boxes: one for the month, one for the day, and one for the year. A change to the year or the month should make the day selection box show the appropriate number of days. Once the user selects the appropriate date and pressed a button, a calendar should paint with the due date (280 days after the current date).

I succeeded in creating the application in all of the languages mentioned above with the exception of CGI. Unfortunately, CompuServe does not support CGI, so I didn't go to the bother of creating a page I couldn't host. This page contains a general description of each of these languages, as well as links to the source code of the applications created and the applications themselves.

JavaScript

JavaScript is a scripting language developed by Netscape and built into Netscape Navigator. A limited version of JavaScript is also built into Microsoft Internet Explorer. This makes JavaScript somewhat universal, as Internet Explorer and Netscape Navigator are definitely the market leaders, but there are other browsers out there.

If you are designing application for in house use where Navigator is used, JavaScript is an excellent choice. It's fully object based, and the code is text stored within your HTML document or a separate text file stored on the server. The code is quickly downloaded with the document and interpreted by the browser.

If you have only limited requirements, you can code carefully for Internet Explorer in JavaScript. Microsoft chose to implement their own language, JScript, rather than licensing from a competitor. JScript is compliant with version 1.0 of JavaScript. For assistance programming JavaScript for Microsoft compliancy check out The JavaScript Sourcebook.

The application shown works almost entirely in Internet Explorer, with the exception of the dynamic recreation of the Day selection combo box. I thought about removing it for cross-browser compatibility, but I decided to stick to the original specs.

The most interesting problem that I encountered in working with JavaScript was dealing with dates. The function Date.getYear(); returns the year as a two digit number for dates between 1970 and 1999 (you can't use dates earlier than 1970) and returns a four digit number for dates beyond 1999. While it's not impossible to work around this issue, it surprises me that a language created in 1997 would have such a problem. The code to avoid the problem is shown below:

var Year = today.getYear();
if (Year < 100)
  Year += 1900;
if (year < 1970) {
  year = year + 100;
  }


While this code is not a big deal (in fact, each of the languages I used had to incorporate some Year 2000 compliancy code with the exception of Delphi) It is curious that this was not taken into consideration in the creation of JavaScript.

There are some limits to what JavaScript can do, but it is an easy language to learn and work in. The only tool you need to generate JavaScript code is a text editor to create the HTML codes. One issue to be aware of with both JavaScript and VBScript is that your source code is there for anyone to view. It is plain text, and difficult to protect. Overall, JavaScript is a strong tool for development of dynamic web pages.

• To learn more about the JavaScript Due Date Calculator, read the source code.
  
• To see the application, check out the JavaScript Due Date Calculator. Note: This page only works in Netscape Navigator 3.0 or greater

VBScript

VBScript is a scripting language developed by Microsoft and built into Internet Explorer. Although VBScript is licensable, I know of no other browser that implements it. This puts a serious limitation on the utility of VB Script for the World Wide Web. Even Microsoft uses JavaScript on their web site over VBScript in almost all cases.

If you are designing application for in house use where Explorer is deployed, VBScript is an acceptable choice. Microsoft has made it very easy for developers to add browser capabilities into applications using Internet Explorer, and it is free to users. Over time, these factors are almost sure to make Internet Explorer a default in many organizations.

VBScript is based on Microsoft's popular Visual Basic(VB) language, and should be an easy choice for organizations looking to do in-house work for Internet Explorer, especially if they have used Visual Basic in the past. Like VB, VBScript is partially object based. Users who have not used a fully object oriented language may like this better than JavaScript's fully object based approach at first.

The use of ActiveX objects in VBScript allows for more potential flexibility, but designing an HTML form with these is complicated. The example below shows the code to add the combo box for the Months.

<OBJECT ID="cboMonths" WIDTH=137 HEIGHT=24   CLASSID="CLSID:8BD21D30-EC42-11CE-9E0D-00AA006002F3">
    <PARAM NAME="VariousPropertyBits" VALUE="746604571">
    <PARAM NAME="DisplayStyle" VALUE="7">
    <PARAM NAME="Size" VALUE="3634;635">
    <PARAM NAME="MatchEntry" VALUE="1">
    <PARAM NAME="ShowDropButtonWhen" VALUE="2">
    <PARAM NAME="FontCharSet" VALUE="0">
    <PARAM NAME="FontPitchAndFamily" VALUE="2">
    <PARAM NAME="FontWeight" VALUE="0">
</OBJECT>


Before you get too panicky, you don't have to generate this code from scratch. Microsoft has a product called the ActiveX Control Pad to assist in the creation of this code. The control pad is a little clunky to me, and I prefer the limited but obvious control model of JavaScript to working in this, but the flexibility of adding any ActiveX control has serious advantages. You can download the ActiveX Control Pad from Microsoft.

I found VBScript a little more awkward than JavaScript. The limitation to only Microsoft browsers is an issue, and I'm not sure that any ActiveX control will run consistently on non-Microsoft platforms. However corporate environments with a trained Visual Basic programming staff might find VBScript the easiest way to go.

• To learn more about the VBScript Due Date Calculator, read the source code.
  
• To see the application, check out the VBScript Due Date Calculator. Note: This page only works in Internet Explorer 3.0 or greater.

ActiveX

ActiveX is a technology from Microsoft built on their common object model(COM) and Object Linking and Embedding(OLE) technologies. ActiveX files are compiled to a specific machine, which limits their usefulness to the internet. At this point, the only browser which supports ActiveX objects is Microsoft Internet Explorer 3.x or higher for Windows. Soon(at least soon in Microsoft's mind) ActiveX should be available for Macintosh and UNIX. This will solve some problems, but one control on your page will not work in all environments. You have to build separate ActiveX controls, one for Windows, one for UNIX, and one for Macs; then incorporate them into separate pages.

While the platform dependence of ActiveX limits it's use for the web, the fact that ActiveX controls can also be deployed in Microsoft Office Applications as well as most Windows development environments makes it a tough competitor in the Wintel dominated corporate workplace. ActiveX files are also downloaded from the internet and executed natively on the machine. ActiveX is the only internet technology that allows for native code, which tends to run much faster than interpreted code.

ActiveX development for Windows is fairly easy. Visual C++, Visual Basic, Delphi, and PowerBuilder all include facilities for generating ActiveX objects. As a long time Delphi user, I selected Delphi to create my project. Delphi generates thousands of lines of code for an "Active Form" project, but adding your own code is quite simple.

The oddest quirk that I encountered in creating this project was dealing with combo boxes. Something about the Active Form loading process makes reading the itemIndex of a combo box set at form load read as -1, in spite of a different visible item. You can get around this by using the indexOf method of TStrings with the text property of the combo box as shown Below:

monthInt:=cboMonth.Items.IndexOf(cboMonth.text);

This works quite well, and doesn't require significantly more code than the itemIndex method.

Another issue specific to ActiveX controls in general is code signing. As you will see from the example, an unsigned ActiveX file will display a warning to the user before downloading. The warning says that the file has not been "signed" and may contain viruses or otherwise harm your computer. To sign your applications, you have to register with an authenticode Digital ID broker such as VeriSign. VeriSign charges $20 per year for a personal digital ID.

While it was fun to create the ActiveForm project, I wouldn't recommend it as a useful web programming tool. If you are designing a control that can be used throughout applications such as Word and Excel as well as in house applications, an ActiveX control is useful, and can certainly be added to a web page if it needs to be accessed over the web. However, if you are designing a control specifically for access through a browser, I would encourage you to look at your other options first.

• To learn more about the ActiveX Due Date Calculator, read the Delphi source code.
  
• To see the application, check out the Active Due Date Calculator. Note: This page only works in Internet Explorer 3.0 or greater. A prompt will come up telling you that the file is not signed by the publisher. Although I have not spent money to verify that my intentions are good, I assure you that they are.

Java

Java is one of the most talked about technologies for the web today, and not without good reason. Java is really three things. First, it is a language. The language is a fully object-oriented language similar to C++. Second, it is a type of compiled small application (generally called "applet") in a format called bytecode. Finally, it is an interpreter that can run on almost any platform, taking the bytecode and executing it. Java was created by Sun Microsystems and it has had a huge impact on the computing world in a very short time. Of all the solutions talked about on this page, the Java applet is the only solution that runs on both Internet Explorer and Netscape Navigator

Java has just gone through a major revision to 1.1, but most browsers are still only compliant with Java 1.0. If you develop an Applet using 1.1 features, it may not work on many desktops. The JavaBeans component model introduced with Java 1.1 makes it a serious contender for enterprise application development, not just web page applets. Within the next year or so, more browsers will support Java 1.1. In the meantime, 1.0 is sufficient for fairly sophisticated development.

I found one bug when compiling my application. The line

long gestation = 1000*60*60*24*280;

did not calculate to 24192000000, as it should have. To get the line to work properly, I had to break it into two calculations as shown below:

//1 ms * 1000= 1 sec * 60 = 1min * 60 = 1 hr * 24 = 1 day
long oneDay = 1000*60*60*24;
long gestation = oneDay * 280;
//following line will cause incorrect date--
//must break it down to the two lines above
//long gestation = 1000*60*60*24*280;


I encountered this error using the JDK 1.0.2 compiler for Windows 95. I have not done serious testing to see if the error occurs in other environments.

Java is certainly the programming language of choice for dynamic HTML pages that can be viewed on a variety of browsers. The tools needed are any text editor and the Java Developer's Kit, which is available on Sun's home page for a variety of platforms. Over the next year, the JDK 1.1 will become supported under more browsers, and sophisticated Integrated Development Environments will be released for it, making visual application development more accessible.

• To learn more about the Java Due Date Calculator, read the source code.
  
• To see the application, check out the Java Due Date Calculator.

Conclusion

Of the technologies I used, ActiveX is the least generically useful. It is a proprietary solution, and not entirely appropriate for web development. VBScript is also relatively limited at this point, as it is only supported by Internet Explorer. JavaScript is more useful, but you should stick to developing 1.0 compliant JavaScript so that it will work in Internet Explorer. Hopefully, the HTML standard will be extended to include some scripting capabilities. If this happens, all browsers will have to support it.

In the meantime, Java is the most complete and fully supported programming method for the world wide web. Over the next several years, Java should continue to evolve and gain support. Most current operating system vendors have committed to build Java into the core of their operating systems. Sun has talked about creating Java accelerator chips, which should improve the performance of Java on systems that incorporate the chip. Nothing in the computer industry is certain, but enough large companies have invested in Java that it should continue to grow and evolve.