RE: FLASH: OT: vbscript in Moock detect for Flash

[Nick Ryan]

A guess:


I suspect that IsObject may return an object reference (which can

evaluate to true)

or null (which doesn't evaluate to false).


In the ie3a version you have the lines:

	document.write('on error resume next \n');

	document.write('if

IsObject(CreateObject("ShockwaveFlash.ShockwaveFlash.5")) then \n');

	document.write('  flash5Installed=true \n');

	document.write('else \n');

	document.write('  flash5Installed=false \n');       


Perhaps the IsObject test on Flash5 generates an error because it

returns null and you 

do the equivalent of if null. If so,

the resume next may be causing the javascript engine (somewhat scarily)

to resume from the next line i.e. inside the if statement rather than

the

following else. This would cause flash5Installed to be set to true and

the 

rest of the if statements to be skipped.


In the ie1 version you have:

 document.write('flash5Installed =

(IsObject(CreateObject("ShockwaveFlash.ShockwaveFlash.5"))) \n');	

and then later:

 alert('flash5installed is ' + flash5installed);


I again suspect that IsObject may return an object reference (which can

evaluate to true)

or null (which doesn't evaluate to false).

Thus you would be setting flash5Installed to null in the first bit of

code and

would explain the runtime error of trying to do an alert on a null

variable

and also why the code:

	for (var i = 2; i <= 5; i++) {	

		if (eval("flash" + i + "Installed") == true)

actualVersion = i;

	}

still works.


-----Original Message-----

From: Helen Triolo [

designeri-technica [dot] com (mailto:designeri-technica [dot] com)

]

Sent: 18 December 2000 20:27

To:

flasherchinwag [dot] com

Subject: Re: FLASH: OT: vbscript in Moock detect for Flash



No answers on this from the state courts, so I'm bumping it up to the

supreme court in hopes that someone here will know...


Scenario:  running IE5, flash activex disabled per Macromedia

instructions, all copies of swflash.anyextension deleted from hard

drive, coded with subset and variants of Moock detection routine


Case 1) http://i-technica.com/flashdetect/detect_ie1a.html: popup

alertbox shows actualVersion=0 as expected, gif displayed as expected,

no prompts, everything peachy


Case 2) http://i-technica.com/flashdetect/detect_ie3a.html (code same in

all but 2nd section of javascript, but should function same): popup

alertbox shows actualVersion=5 and then does the "Do you want to install

and run Flash 5.0?" prompt.  Why does it think actualVersion=5?


Case 3) http://i-technica.com/flashdetect/detect_ie1.html (same code as

case 1, but with 2 lines added in body javascript to display variables

flash5installed and flash3installed):  popup alertbox shows

actualVersion=0, followed by runtime error, flash5installed undefined. 

Why undefined instead of false?  And if flash5installed is undefined,

why isn't actualVersion also undefined?


Any answers to 2 or 3 would be much appreciated.


Regards,

Helen 

-----------------------------------------------------

i-Technica  �  http://i-technica.com  �  301.424.6037

developer resources: http://i-technica.com/whitestuff


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

flasher is generously supported by...

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

   flashforward2000 and the Flash(tm) Film Festival

 November 27-29, 2000, LONDON, National Film Theatre


   Produced by United Digital Artists and lynda.com

-Sponsored by Macromedia, Adobe Systems and Apple Computer

-http://www.flashforward2000.com  or UK tel. +44 (0870) 751 1526

       Register before November 10 and save �200

            http:// www.flashforward2000.com

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

  To unsubscribe or change your list settings go to

http://www.chinwag.com/flasher or email

helpchinwag [dot] com

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

flasher is generously supported by...

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

   flashforward2000 and the Flash(tm) Film Festival

 November 27-29, 2000, LONDON, National Film Theatre


   Produced by United Digital Artists and lynda.com

-Sponsored by Macromedia, Adobe Systems and Apple Computer

-http://www.flashforward2000.com  or UK tel. +44 (0870) 751 1526

       Register before November 10 and save �200

            http:// www.flashforward2000.com

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

  To unsubscribe or change your list settings go to

http://www.chinwag.com/flasher or email

helpchinwag [dot] com