Over the last couple of weeks I’ve had the delightful experience of conversing with one of my heroes – Bruce McKinney who wrote Hardcore Visual Basic. Bruce has been off doing other things – not programming. So from my narrow perspective, it’s a bit like talking to he’s been in a time capsule. I asked him to let me share this unique and very different perspective on VB.NET:
I hadn’t even thought about VB or any other computer language for years when a woman named Kathleen Dollard sent me an email out of the blue asking if I was the same Bruce McKinney who wrote a certain book. Well, yes, I did write a certain book about a certain language back in a different lifetime. I started a conversation with Ms. Dollard (who turned out to be some sort of VB.NET guru) and during that conversation I idly asked how VB.NET had turned out. I had written a short analysis of VB.NET in its beta stage (see http://vb.mvps.org/hardweb/vbnet.htm), but I never saw the finished product, much less the current version of what should by now be a mature language.
Well, one thing led to another (as it had in the past and as I had promised it never would again). I discovered what I assumed was a crippled toy version of VB.NET called Visual Basic Express Edition. Why not download it and at least look through the language syntax to figure out what happened? Well, anybody reading this probably knows that VB Express is one of the largest toys in history. It didn’t take long to realize that I had probably made a mistake.
The first thing I discovered is how bad the help and the help engine are. It’s a mess of incompleteness and broken links—even worse than the execrable help in VB6. During setup I made the mistake of saying I wanted help first on my disk rather than online. The result was total confusion with all sorts of languages mixed up with incomplete topics. Everything seems related to VB6, and some of it is completely wrong about VB6, and its differences from VB 2008. You’d think after ten years most VB.NET programmers would be new people who wouldn’t know or care about VB6, but the internal help seems oriented to people who skipped all those earlier versions and are just now converting from VB6.
Finally I got online to an MSDN site that summarized all the language features. It wasn’t great, but way beyond what came with the program. I worked for five or six years in Microsoft language documentation before I went into development and then to Microsoft Press. We had less training and education than documenters have today, but we did a much better job. Are there no good technical writers left? Is MSDN paying three times as much as the VB team to get the few semi-competent ones? It was depressing.
Once I finally found documentation, I had some surprises. First I checked everything I criticized in the beta and sure enough the mistakes were all still there. They really did cripple arrays. They really did put AddressOf in the Delegate syntax even though it’s a lie. They really did change While/Wend to While/End While instead of killing it. They really did change the Property syntax for no reason other than to break code. They really did remove Imp and Eqv without adding Shl and Shr. Fortunately, they restored Static, which some idiots had removed from the beta.
Now I know these are really small things in the big picture, but languages are about symbolism and metaphor. If you don’t understand the importance of metaphor you shouldn’t be designing languages. And if you’re going to clean house and change everything, why not kill Dim? If they had just added Local, they could have left Dim in place for compatibility, but no thoughtful coder would ever use it in new code. But no on the VB team seems to understand the purpose of compatibility or deprecated features.
The thing that bugs me the most is the crippled arrays. In VB6 (as in all real high-level languages) you can declare any array bounds you want. For example, assume I wanted an array of temperatures within a reasonable range so that I could record how many times each temperature was reached.
Const iMinTemp As Integer = -50, iMaxTemp As Integer = 125
Dim aTemp(iMinTemp To iMaxTemp) As Integer
aTemp(iTodayTemp) += 1
That’s how I’d do it in VB6 (or Pascal or any other civilized high level language), but that’s not possible in VB.NET (or C# or Java or any of the other pretenders). Instead I’d do something like:
Dim iOffsetTemp = 0 – iMinTemp
Dim aTemp(0 To iMaxTemp – iMinTemp) As Integer
aTemp(iTodayTemp + iOffsetTemp) += 1
I have to do all the stupid bookkeeping (with all the risk of an off-by-one error) every time I use the array even though that’s the sort of thoughtless bookkeeping high level languages are supposed to take care of. Every time I used one of these brain-dead arrays it would make me angry that someone had deliberately crippled our language.
Well, enough about old complaints. I also found some surprising new stuff such as += and -=. I didn’t expect that. It’s hardly in the Basic tradition, but I always appreciated those operators in C. They also added signed integers. Kemeny and Kurtz didn’t just forget about signed integers. They left them out on purpose and bragged about their absence as a feature. I’m sure signed integers are there for interoperability, which shouldn’t be a Basic goal and wasn’t needed, not even to call signed arguments in the library.
How about operator overloading? That was a surprise. Does overloading work nice and easy in VB? Or is it loaded with gotchas as in C++? Generics look simple enough, and it would be nice to have them built into the language without the weird side effect of the C++ preprocessor. I had a great time building generic C++ classes for VB safearrays (now gone). I hope generics in VB are as much fun as in C++, but less confusing.
But enough philosophizing. Let’s write some code. I start out by trying File New Project. Interesting choices. I have not the slightest idea what a WPF Application might be (and when I check help I see I don’t want to know), but I can guess what a Windows Form Application might be. So I try it. There’s my form. Once again VB guesses that I want to call my form variable Form1 and that the caption on it should be “Form1″. Just as wrong and evil as in VB1. You’d think by now they’d have learned not to encourage bad habits. OK, I want to put a button on this form, but there are no buttons. I play around for three minutes before I figure out how the toolbox slides over. Cool.
I put a button on the form. It comes out as Button1 rather than Command1. A step forward. It takes me a minute to figure out how to change the variable name to something sensible–btn. I add a label named lbl. When I remove the text from this label it disappears. Something funny is going on in the properties, so I examine the list. There are some properties I’ve never seen. I put the cursor on an unfamiliar one and press F1. It tells me what a property list is, but nothing about any particular property. Hmmm. Finally I figure out how to turn off AutoSize and make the label 3-D.
I click on the button and insert lbl.text = “Hello, world” in the btn event procedure. I run it and it works. But when I click it again nothing appears to happen because it’s overwriting the same message. I need the text to change. I go back to the event procedure and type Static c As Integer = 1. Ahhhh! What a luxury! What I would have given to do that back in VB5. I started begging for this in VB4. I go to the bottom of the procedure and type c += 1. I’m still not sure I like this, but I do it anyway. Then I think what if VB has… Naw, it couldn’t be. I try c++, and what a relief. It doesn’t work.
Then I go back up and change the label assignment to lbl.text = “Hello, world ” + c. I get an InvalidCastException. So, VB is not so loose anymore with type conversions. “Evil Type Coercion” must be gone. This is a good thing. How about “Hello, world ” + CStr(c). This works. But then I think: This is an object oriented language. An integer variable ought to have conversion methods. So I remove the CStr and type a dot after c. All the methods appear including ToString. Wow! lbl.Text = “Hello, world ” + c.ToString. Yes! When I run it, the text counts every time I click.
Not quite like old times, but it has its moments.
Then I remember something interesting from the File New Dialog. Could I really write a console application in Visual Basic? I try it and there’s the Sub Main() followed by End Sub with a cursor sitting in the middle. It looks more like my first C program than my first BASICA program, but it’s obvious what to put in between. I type Print “Hello, World”. VB encloses my string in parentheses. Is the syntax difference between a Sub and a Function really gone? When I press Run, it starts a console, but then fails and tells me an InvalidCastException was handled. A syntax diagram tells me that print takes a file number followed by a ParamArray Output(). OK, we’re not in Kansas anymore.
This isn’t enough information, so I move the cursor to Print and press F1. Information Not Found. No help on Print? I look in the help index. No Print statement. There is an entry for Print # statement, but that takes me to a table of changes from VB6. I find Print # in this table and click on a topic called Print and PrintLine. Information Not Found.
After messing around for a while and seeing more Information Not Founds, I figure out that I may be on the completely wrong track. It appears that maybe writing text is done through the FileSystem. Instead of Print, I try My.Computer.FileSystem.WriteAllText(“Hello, World”). This fails because it needs three arguments, the first a file name. Maybe there is a standard string for the console such as “CON” or “SCRN”. I think this worked in some version of C file I/O. After some experimenting, I try arguments WriteAllText(“scrn”, “Hello, world”, True). This is valid and runs, but doesn’t print in a console. Probably somewhere on my disk is a file called “scrn” containing the words “Hello, world”. I search and sure enough, there it is in a semi-random directory.
I put my cursor on WriteAllText and press F1. Information Not Found. I mess around for a while longer and find a link to a help topic on console applications. Information Not Found. Do I really want to be a VB programmer? Information Not Found.
Now it happens that at the moment my home internet connection is broken so I have to go to work to get online, but I’m doing this at home. I could probably figure this out if I could get to MSDN. But there’s no excuse for installing a broken help system on something called VB Express Edition that takes more than an hour to install. Sure enough, when I get back to the internet, the solution is simple, although I never did find it in VB help or MSDN. I googled “VB.NET console sample” and found the information on a non-Microsoft web site. I just need Console.WriteLine(“Hello, world).
There are some good things here, but overall I think I better get this damn thing off my computer before I get really mad. Or hooked.