Early Enough For You?

Interesting post from Jeff Attwood.


He makes good points about not pushing your code the extra mile to get it absolutely perfect before shipping, although the Rumsfeld quote is always unfortunate IMO, and there is a lot of truth in it. However, it is not that black and white. The correct balance has to be struck. We all know the development paradigm, balancing time, quality and cost; something always has to give. It is invariably quality, and maybe Jeff is right and that is the first thing that should go, but not at any quality. If it is not good enough, then it should be held back, releasing a pile of rubbish will do more harm than being a bit late.


I personally think that Excel 2007 was released before it should have been, and Vista most certainly was. These were development decisions made for marketing purposes, and I don’t think it has enhanced Microsoft’s standing or image.

Conditionally Yours

VBA is a very simple language and programming environment, very easy to get something up and running very quickly, but it is showing its age these days, and with Microsoft making no improvements to the language it will not get better.

Which all means that we should utilise all of the functionality already available to us. I was using a particular technique the other day, and I recollected a discussion on one of the popular Excel forums that I had participated in, one in which I was surprised at the lack of knowledge of this technique.

The situation I found myself in was that I had developed some functionality in an application, and this functionality was quite sophisticated, but was not fully working as I wanted. I needed to deliver something, so I decided to do it in a simpler way, but I didn’t want to just lose my previous efforts, I wanted to continue to try and complete my initial attempts.

I could have just stripped out all of the old code and added in the new code and save it as a new workbook, I will still have the original code from the previous workbook. But this would mean that any other changes that I made to my new workbook, other than this revised function, would need to retro-fitted into the old workbook otherwise it would soon be useless. I think the chances of messing this up are obvious.

Another way would be to create a Public constant, and test this variable and execute the code depending upon this variable, something like this

Public Const NewVersion As Boolean = True

And then in the modules, code such

    If Not NewVersion Then

       ‘old code
    Else

        ‘new version code
    End If

This works okay, but of course all of the code will be compiled, and there are potential problems if you have variables associated specifically with the old or new versions, if they are being used incorrectly elsewhere the compiler will not throw them out as they will still be defined.

The solution is to use Conditional Compilation. This is similar to the technique above, but a conditional constant is used, and conditional statements. The code would look like this

#Public NewVersion = True

And then in the modules, code such

    #If Not NewVersion Then

       ‘old code
    #Else

        ‘new version code
    #End If

The advantages to this approach are:

·         depending upon
the value of the conditional constant, only that part of the code will be
compiled

·         unlike standard
If statements, public variables can be wrapped in #If … #End If statements

·         VBA contains a
few built-in conditional constants, such as Mac (test for Mac platform), Win
(Windows), VB6, which are available to use

·         the conditional
statements can help ensure variables are correctly used when compiling

·         identifying the
code to strip out if and when it is decided that one approach is the preferred
way is facilitated by the #If statements.


I tend to put conditional constants in each code module, although it is possible to set it in the project properties. I just find the module approach more intuitive, you can assign values such as True/False whereas in the project properties you have to set values of -1/0 (sic!). It also means I can have different values in each module when I am testing. Note that conditional constants will not accept an explicit Public declaration, nor will they allow strict data typing.


This is an extremely useful technique, but just remember to have those values properly set at the end.



 

One King Bearing Gifts


I got a new laptop on Friday (my old one gave up the ghost as explained here).


One of the major pains of a new laptop is re-installing all of those applications. It takes so long, and inevitably you will be working and you realise that you need another utility, which means you have to interrupt your flow to grab it and load it. I was more prepared for this installation than I usually am, I had compiled a list of those applications that I wanted, my directory structure, and URLs to the files, but I missed plenty (you just forget some of those things that you use, such as Inno Setup until you need them).


I am sure that many of you will be saying that if I had taken a disk image, re-installing would have been a breeze. That may be so, but I tend to see re-installing as an opportunity, an opportunity to get rid of much of the crud that accumulates over time, only install the things that you need.


As one would expect, some things went so smoothly, some things did not.


Installing Office 2000 and Office 2003 was a breeze, I remembered that I wanted VBA loaded (yes, I have forgotten it before), and it loaded so quickly, so effortlessly. I had to do all of the customisations, remove those stupid restricted menus and always show the full menus. I did get caught by not giving Trusted Access to Visual Basic, and one of my VBIDE routines failed, but that was soon rectified.


Office 2007 was no great problem, it took a lot longer than 2000 or 2003, but I guess that is the way that things progress. One of the pleasing things is the way that many settings seem to get inherited by all versions. I know this may seem like heresy, but I have missed 2007. I can’t say I am a fan of the Ribbon as I think it is a mis-guided concept and is restrictive and inefficient, and there are many things broken in 2007, but since I have loaded it I have tended to use 2007 as my default Excel. As I have said previously, I have enjoyed using Excel 2000 but I heave eased into 2007. I have also adopted Outlook 2007, but one email client isn’t much different to another is it? Word 2007 still grates with me, it seems perverse (but Word has always seemed perverse to me, just look at how it keeps messing bullet lists up). Building the QAT back up was far time consuming than I would like. I know Jon Peltier doesn’t believe in customising the QAT, he says that is subverting to MS’ ribbon philosophy, but I find that I have to have my most frequent functions on hand.


But why oh why do all new applications get added to the foot of the program list? Why doesn’t it get slotted in alphabetically. The bottom is usually the last place I want it.


And while we are at it, why is the Quick Launch toolbar hidden in XP, and locked down to boot?


One thing that went remarkably smoothly was my Firefox bookmarks. I use XMarks to synchronise my bookmarks, so a quick login to XMarks, tell it to synchronise with this laptop and remove all existing bookmarks, and I was up and running. All of my bookmarks, all of my RSS feeds were re-installed in minutes, and XMarks will keep me up to date ready for my next laptop crash (thanks Aidan!).


It took me a while, but I am back and active now. I am sure more things will arise over the next few weeks (I still need to add another partition and install Windows 7 dual boot), but essentially we are there.


One thing to finish with. Where we would we be without free software, open source and not. The following is a list f some of the free software I have loaded and use regularly


GParted
Inno Setup
Firefox
Revelation
MP3Tag
Audacity
Skype
Hamachi
FileZilla
IZarc
Belarc Advisor
CDex
CCleaner
Code Cleaner
NameManager
KeePass


Plus others that I am sure that I have missed (so, Mike Alexander, with quality free products like this, why shouldn’t  corporations trust them?)