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Now I'm curious. This indicates that it indeed supports interface inheritance (described here), and like you mention it does not directly support implementation inheritance.
I'd look into this inventive way to get implementation inheritance working, but I think won't since I don't plan to use VB6 ever again. 
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I didn't need it often - maybe a couple of times in a year. What I did was use an internal class with the same interface. A
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That was the first letter of my first name -_-'
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I worked in VB6 for years. I was firmly entrenched that I didn't need any other languages, because I could use all the APIs and add functionality if needed.
Using CreateThread() from VB6 was generally a very bad idea. You couldn't access anything from the VB runtime, since that was not re-entrant. The best you could get was an Out-Of-Process component as a "multiple thread" but I'm not sure if we can count that.
Now that I can look back on VB6, I can say that Classes and Object-Oriented support in VB6 was barely workable. When I think back to the things that took the most effort in VB6, I realize that almost all of that effort is either a result of features the language didn't have (such as emulating implementation inheritance by delegating to an aggregate and using implementation inheritance), or working around it's myriad fiobles (have fun implementing IEnumVariant!).
Compared to VB6, C# is (for me) like the difference between having to manually slaughter, gut, and butcher a Animal compared to simply having to cook a steak.
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I agree that C#, and VB.NET, are much better than VB6. That is why I have not written new code in VB6 for years.
My approach, back in my VB6 days, was that if I had a performance bottleneck in my VB6 code that was not resource-related (disk I/O, RAM, etc.), then that code would get moved to C++ (or even C in some cases) to improve performance. But for Windows programming, VB6 was pretty much all that was needed. I wrote Windows services, COM+ servers, other middleware, as well as UI code with VB6. All worked well. Classes and OOP in VB6 was easily doable, for its day, so long as I took the time to know how things worked. I find OOP in C# and VB.NET is not only easier today, but has the additional functionality not available in VB6. Plus, I can write 64 bits apps, which I cannot in VB6.
Using CreateThread() in VB6 is not a bad idea, just one that requires a little knowledge. For example, I used a TLB for the thread API to bypass the runtime and go to OLE directly. The code I wrote for multithreaded VB6 apps was always stable and worked well. My code was adapted from some work Srideep Prasad did and posted on Planet Source Code back in the day.
VB6 was excellent for its day, did not deserve the reputation it had, and was the best Windows development language available then. But that was 12 years ago when .NET took its place.
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Welcome to my world. We have an application that was converted from mainframe COBOL to netCobol, i.e. the worst .Net step-child ever thought up, then converted to C# a few years later. The Brainchild behind this endeavor felt it necessary to code this into the netCobol version.
toolStripStatusLabel1.Text = "Silly error message that by rights should be in a message box.";
Console.Beep();
This kind of thing exists 87 times and they're still in the new C# version. I figure if a message to the user is important enough to require a beep to get their attention, it should really be in a message box. Then again, the person coding this app also thought it would be a good idea to load the main form with 12,000+ lines of code, most of which is business logic. But what do I know, I only have an associates degree.
Comments from work:- "Why can't you just do it like everybody else?"
- "Well, we haven't had any complaints yet."
- "I just want to get it into production."
- "It only matters if it’s important to someone who matters."
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I feel for you, I really do.
The one redeeming factor where I am is that I'm in the position of determining the new architecture, so a lot of detritus is firmly being shown the door.
PS. I knew some company must have been using one of the odd .NET COBOL variants.
It could be worse, I had to port some RPG to C years ago, and there is indeed an RPG .NET compiler. Look at the (Wikipedia[^] to see how bad things could be.
"If you don't fail at least 90 percent of the time, you're not aiming high enough."
Alan Kay.
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Thanks. It's encouraging to know there are people in the position of being able to kill code silliness and then have the sense to do it.
As for RPG.NET, yuck. I think I'll avoid it as much as I do netCobol, a subject you realy don't want me to get started on.
Comments from work:- "Why can't you just do it like everybody else?"
- "Well, we haven't had any complaints yet."
- "I just want to get it into production."
- "It only matters if it’s important to someone who matters."
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 Perhaps they had to run lengthy jobs while they slept, and had it beep to wake them up in case anything went wrong?
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I always thought that was what the keyboard auto-repeat beeps were for - to notify you that you've nodded off at your keyboard.
"If you don't fail at least 90 percent of the time, you're not aiming high enough."
Alan Kay.
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A beep wouldn't wake you up unless you're a mosquito 
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Especially not here, where PC speakers are disconnected by company policy.
"If you don't fail at least 90 percent of the time, you're not aiming high enough."
Alan Kay.
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I'd wake up if an ant farted.
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AspDotNetDev wrote: I'd wake up if an ant farted.
Because of the sound or because of the smell?
Author of Primary ROleplaying SysTem
How do I take my coffee? Black as midnight on a moonless night.
War doesn't determine who's right. War determines who's left.
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Back in the day a beep was a good thing to have.
So what did you replace it with when you rewrote the vb6 code? 
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There are two parts:
1. We now use a .config file to store these settings. Reading these is done during app startup. If errors occur, either (a) a message is shown to the user if the settings is required, or (b) an entry is made in a log if the entry is non-critical.
2. The original coding loaded the settings within a VB Form. I've migrated this to app startup code, so the errors (a) raise an exception so they can be reported back to the user in a more managed way.
The old app has the business logic entirely in VB forms, in the new version almost all business logic is in C# classes, the (WPF) forms have minimal code to set the data context for the form to an appropriate view model object.
"If you don't fail at least 90 percent of the time, you're not aiming high enough."
Alan Kay.
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Don't underestimate "beeps". I know one wizard of Oz who writes batch mode applications (each averages 30 mins of run time) and over years, he has evolved this beeps thingy into the state of art. Most days, his daily task comprises of starting the comps, setting batch jobs, set them running and then loiter around in office all day. He can be at other end of room and just by hearing meaningless (to me) sequence of beeps, he can tell which batch job which started finished.
For those not directly involved with his work, it is a sight to see whenever his batch jobs fail and he gets desk-bound for hours. Guess where the beeps are coming from in those days? His mouth!! (And it ain't pre-watershed telly!!!)
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Rob Grainger wrote: It's also worth considering that none of our PC's have a speaker 
Surprisingly, someone asked me for an internal speaker beep to be added to a VB6 application recently, for users without speakers.
I had a look into it and, ignoring the fact that there would probably not be an internal speaker, a modern Windows O/S will divert the beep to the soundcard if there is one (even if its integrated) which needs speakers. So unless you have a machine with an internal speaker running Windows 98 or something, it just won’t do anything.
For some reason that made me feel sad and I briefly missed not being able to make things beep in such a simple manner!
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There must be a lot of VB6 code in those darn smoke detectors!
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The developer who made this, should be forced to wear headphones and make his/her program fail constantly for 24 hours... 
Seriously, there was a time when computers had an internal speaker, given that this is VB6, i'm not really surprised.
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RafagaX wrote: Seriously, there was a time when computers had an internal speaker
I remember far enough back that the way you made sound on a computer was by controlling the data emitted when saving to cassette (not to be recommended).
"If you don't fail at least 90 percent of the time, you're not aiming high enough."
Alan Kay.
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List<Employee> employees = new List<Employee>();
if (employees != null){
employees = GetEmployees();
}
Previous -> Read "CLR via C#" by Jeffrey Ritcher.
Current -> Exploring WCF thru Apress' "Pro WCF" by Chris Peiris and Dennis Mulder.
Next -> Need to read "The Art of Computer Programming" by Donald E. Knuth.
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