FLASH: questions on file format

[Wei Qian]

Hi, there:


I am new to Flash and reading SWF File Format Spec. from the Macromedia

web page on

www.macromedia.com/software/flash/open/spec. I have two questions on

tagged block of

DefineButton2.


1. There is a field "Buttons" of button character records with color

transform

with alpha, typed BUTTONRECORD.

On the next page, the type of BUTTONRECORD is defined and the last

field of this record, ColorTransform has "nCharacters in button" number

of CXFORM's.

My question is that where the number "nCharacters in button" defined in

the file.


2. Right after the field "Button", it's the field

"Button2ActionCondition".  It seems to me

that this field does not consume any bytes since the type is empty and

the comment tells me

that it is equavilent to the rest of the block. Is that true?


Thanks in advance,


-Wei



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