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• Human sacrifice, dogs and cats living together, mass hysteria! and thread model errors!

  Reader Shaka comments on my post about error messages that "catastrophic failure" really does take the cake as being a terrible error message. I fondly remember the first time I saw "catastrophic failure" as an error message. I was an intern, running Read More... Posted Monday, May 07, 2007 4:22 PM by Eric Lippert | 1 Comments Filed under: Scripting, COM Programming, Threading

• Checking For Script Syntax Errors, This Time With Code

  A number of people asked me to clarify yesterday's entry. Rather than try to talk you through it, I think the code is straightforward enough to speak for itself. Here's a little skeleton that I just whipped up. #include <stdio.h> #include <activscp.h> Read More... Posted Wednesday, October 12, 2005 9:37 AM by Eric Lippert | 9 Comments Filed under: JScript, VBScript, Scripting, COM Programming

• Implementing Event Handling, Part Two

  It's been an insanely busy month for me, between having multiple out-of-town guests, throwing a party for the people who couldn't make it to the wedding, and oh yeah, getting up to speed on the C# compiler and trying to understand the implications that Read More... Posted Wednesday, September 21, 2005 11:51 AM by Eric Lippert | 3 Comments Filed under: JScript, VBScript, Scripting, COM Programming

• Implementing Event Handling, Part One

  Back in February I posted a bit about how script hosts such as Windows Script Host dynamically hook up event sources (objects) to event sinks (chunks of script that run when the event fires.) It has become apparent from some questions I've received recently Read More... Posted Friday, September 09, 2005 3:35 PM by Eric Lippert | 0 Comments Filed under: Scripting, COM Programming

• VBScript Default Property Semantics

  Here’s a question I recently got about VBScript, where by "recently" I mean August 28th, 2003. This code works just fine: Set myObject = CreateObject("myObject") myObject.myName = "Eric" WScript.Echo myObject ' myName is the default property, so prints Read More... Posted Tuesday, August 30, 2005 10:15 AM by Eric Lippert | 9 Comments Filed under: VBScript, Scripting, COM Programming

• How Do Script Engines Implement Object Identity?

  I've talked a few times in this blog about the semantics of the equality operators in various languages. (Such as here , and here .) Recently a reader asked me how JScript implements object identity. That is, given two objects, how do we know if they Read More... Posted Tuesday, April 26, 2005 12:49 PM by Eric Lippert | 6 Comments Filed under: JScript, VBScript, Scripting, COM Programming

• Why does WScript.ConnectObject not always work?

  I've had a tiny handful of entries in my VBScript quiz . I know from my logs that 2600+ people have read it. Come on people, there are fabulous prizes at stake here! Go for it! I'm going to keep the contest open until Friday morning, at which point I'll Read More... Posted Tuesday, February 15, 2005 11:54 AM by Eric Lippert | 6 Comments Filed under: Scripting, COM Programming

• VBScript Terminators, Part Two

  You guys came up with good answers to three of my four questions, which is about what I expected; question 2 was pretty hard. To sum up: QUESTION #1: Why does the termination logic go terminate, terminate, terminate, clear, clear, clear, instead of terminate Read More... Posted Wednesday, December 29, 2004 7:47 PM by Eric Lippert | 9 Comments Filed under: VBScript, Scripting, COM Programming

• T4: VBScript and the Terminator

  I had some free time on the flight to Canada and my laptop with me, so maybe I will do a little blogging on my vacation after all. A week ago or so a reader asked me to talk a bit about how class termination works in VBScript. Let’s start by looking at Read More... Posted Wednesday, December 22, 2004 3:42 PM by Eric Lippert | 11 Comments Filed under: VBScript, Scripting, COM Programming

• Why do built-in JScript functions not appear in the typeinfo?

  A reader sent me an email over the weekend asking about some odd behaviour in the guts of the JScript engine. Unfortunately, they didn't include an email address that worked; I just got a bounce message back, Ben. Therefore I'll just answer the question Read More... Posted Monday, December 06, 2004 1:08 PM by Eric Lippert | 14 Comments Filed under: JScript, Scripting, COM Programming

• Wherefore IDispatchEx?

  Quite a while back I said that I'd write a post describing why we invented IDispatchEx . I already covered the part about using it to probe the stack for security reasons, but what other reasons did we implement that thing? The documentation is pretty Read More... Posted Thursday, October 07, 2004 10:32 AM by Eric Lippert | 17 Comments Filed under: JScript, Scripting, COM Programming

• Use vs. Mention in JScript Doesn't Come For Free

  Before today's entry, a quick note. Work has just gotten insanely busy as we push towards getting VSTO ready for the Whidbey release. I likely won't have much time to blog over the next couple weeks, so the blog refresh rate is going to go down for a Read More... Posted Monday, September 20, 2004 10:16 AM by Eric Lippert | 18 Comments Filed under: JScript, Scripting, COM Programming

• Eric's Complete Guide To Type Signatures Of Scriptable Object Models

  Moving away from the problems of junior high school … Here's a question I've gotten many times over the years: how do you design an object so that it can be easily called from both VBScript and JScript? COM defines a fairly complex type system, Read More... Posted Wednesday, July 14, 2004 11:44 AM by Eric Lippert | 9 Comments Filed under: JScript, VBScript, Scripting, COM Programming

• You Can't Convert Data Structures To Strings In VBScript Without Breaking A Few Eggs

  Here's a question I get every now and then: I've written a VBScript program which calls a method on an object that returns an array of bytes containing a GUID. VBScript only supports arrays of variants. How can I turn this into a human-readable string? Read More... Posted Tuesday, May 25, 2004 11:06 AM by Eric Lippert | 15 Comments Filed under: VBScript, Scripting, COM Programming

• SimpleScript Part Seven: Binder Skeleton

  In Part Five I was discussing modules: there is a "global module" and any number of additional modules. Each module is associated with a named item, and the only module which is associated with more than one named item is the global module. This means Read More... Posted Tuesday, May 04, 2004 10:51 AM by Eric Lippert | 16 Comments Filed under: Scripting, COM Programming, SimpleScript