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Odd behavior using copy/part?

 [1/4] from: webmaster::siliconspecies::com at: 4-Jan-2001 1:31


I have a function which reads the header of a binary file and extracts certain bits for analysis. It seems to work fine until home: copy/part header 1 Then it craps out. And the copy function which is Rebol native function returns as a variable instead of copy. You type Help Copy in Rebol/Command after this and it will tell you that copy is either worth 8 or no help for copy or something similar. Which I find distressing, the only way to restore the copy command in Rebol/Command is to close and restart. The solution I implemented was to kill at least half of the code below and only extract info that was absolutely necessary instead of the whole thing. code snippet: variable: head variable header: copy/part variable 4 header: enbase/base header 2 ;changes it to true binary which is like 11111111111110111001001100000000 sync: copy/part header 12 header: skip header 12 ID: copy/part header 1 header: skip header 1 layer: copy/part header 2 header: skip header 3 prot: copy/part header 1 header: skip header 1 bitrate: copy/part header 4 header: skip header 8 freq: copy/part header 2 header: skip header 2 pad: copy/part header 1 header: skip header 1 priv: copy/part header 1 header: skip header 1 mode: copy/part header 2 header: skip header 2 modext: copy/part header 2 header: skip header 2 copy: copy/part header 1 header: skip header 1 home: copy/part header 1 header: skip header 1 emphasis: copy/part header 1 Thanks, Jeff

 [2/4] from: rebol:techscribe at: 4-Jan-2001 0:25


Hi Jeff, your problem is the following line (5 lines from the bottom of the code your included in your email):
> copy: copy/part header 1
Here you are setting the word copy to the result of copy/part header 1 If you should encounter a problem like this again the easiest way of detecting it is by starting your code off with the function protect-system This will result in an error message when you attempt to set one of REBOL's predefined words to a new value, as is the case here. Pretty sure this helps ;-) Elan Jeff Rubin wrote:

 [3/4] from: al:bri:xtra at: 4-Jan-2001 22:03


> I have a function which reads the header of a binary file and extracts
certain bits for analysis.
> sync: copy/part header 12 > header: skip header 12 > ID: copy/part header 1 > header: skip header 1 > layer: copy/part header 2 > header: skip header 3
Easier might be: Sync: copy/part at Header 1 12 ID: copy/part at Header 13 1 Layer: copy/part at Header 15 2 and so on. I hope that helps! Andrew Martin Absolute Rebol... ICQ: 26227169 http://members.nbci.com/AndrewMartin/

 [4/4] from: webmaster:siliconspecies at: 4-Jan-2001 7:57


duh I must be blind :]