Ruby code to retrive sketchup version of a model

slbaumgartner

I find it interesting that model#save includes an argument to tell SketchUp what format to use when saving a model, but like @glro I can find no method to determine either the format that was in effect when the file was opened nor the format used the last time it was saved. Obviously, the data needs to be in the correct form for the running version of SketchUp while in memory, but if it can be converted on load and save, shouldn't the API remember these things?

glro

I have to improve a lot to be able to understand such code...
i'll try

thank you for your quick answer

@tig said:

You need to read the start of the SKP to get its version, before you try to open it or try to load it...
This with get the SKP file's version - referenced as 'v' [string]

vv=File.open(skp_path, 'rb'){|f| f.read }.unpack('m*').pack('m').gsub(/SketchUpModel/,'').to_i.to_s;if v=~/^1/;v=vv[0..1];else;v=vv[0];end

It could be greatly improved, but it works - tested in v2014/v2015 !

driven

@giro
here's a slightly different version I use, with a bit of explanation...

      # 'IO.read' reads the open model file's first '50' bytes
      # which we 'unpack' from binary using 'm' however many times '*' until we get to the end
      # we 'pack' these with 'm' to give a human readable string
      # then we use ruby 'sub' to substitute using a Regular expression '/\D+/' any non Digits with a nothing ''
      # of the remaining string, it's the first 2 digit we want to check '[0..1]'
      ver = IO.read(Sketchup.active_model.path, 50).unpack('m*').pack('m').sub(/\D+/,'')[0..1]
      # to check, we ask if the first '[0]' is a '1', if it is we use both, if not we only use it 
      ver[0].to_i == 1 ? ver ; ver = ver[0]
      puts ver

john

TIG

I said it could be improved

glro

Thank you both of you

my skills in ruby are very limited; using this code , i get in the ruby console:

"56" for a model made with SU8
"49" for a model made with SU13

it's exactly what i was looking for
i shall make a test and filter the skps to process according to the number i get

thanks again

@driven said:

@giro
here's a slightly different version I use, with a bit of explanation...

      # 'IO.read' reads the open model file's first '50' bytes
>       # which we 'unpack' from binary using 'm' however many times '*' until we get to the end
>       # we 'pack' these with 'm' to give a human readable string
>       # then we use ruby 'sub' to substitute using a Regular expression '/\D+/' any non Digits with a nothing ''
>       # of the remaining string, it's the first 2 digit we want to check '[0..1]'
>       ver = IO.read(Sketchup.active_model.path, 50).unpack('m*').pack('m').sub(/\D+/,'')[0..1]
>       # to check, we ask if the first '[0]' is a '1', if it is we use both, if not we only use it 
>       ver[0].to_i == 1 ? ver ; ver = ver[0]
>       puts ver

john

TIG

My way should return "8" or "13" ?
Not sure what's happening...

driven

@sam, why would it return the octal char?

mmm... so should mine return '8' or '13' in your case...
but break it down and post the result...

ver = IO.read(Sketchup.active_model.path, 50).unpack('m*').pack('m')

that should return the first 50bytes...
e.g. SketchUpModel151
if not try 100 for the bytes, maybe windows sees it differently?
john

sdmitch

56 is the octal character value for "8" and 49 for "1". It is a function of V8 Ruby vs V14.

sdmitch

@driven said:

@sam, why would it return the octal char?

mmm... so should mine return '8' or '13' in your case...
but break it down and post the result...

ver = IO.read(Sketchup.active_model.path, 50).unpack('m*').pack('m')

that should return the first 50bytes...
e.g. SketchUpModel151
if not try 100 for the bytes, maybe windows sees it differently?
john

As I added to my previous post, it is the difference between Ruby 1.8 and 2.0. If you run Sketchup8 and enter your code you will get 56 returned. If you change the last line to Puts ver.chr, you will get 8.

glro is running V8, so TIG's code should be

vv=File.open(skp_path, 'rb'){|f| f.read }.unpack('m*').pack('m').gsub(/SketchUpModel/,'').to_i.to_s;if vv=~/^1/;v=vv[0].chr+v[1].chr;else;v=vv[0].chr;end

and yours

      # 'IO.read' reads the open model file's first '50' bytes
      # which we 'unpack' from binary using 'm' however many times '*' until we get to the end
      # we 'pack' these with 'm' to give a human readable string
      # then we use ruby 'sub' to substitute using a Regular expression '/\D+/' any non Digits with a nothing ''
      # of the remaining string, it's the first 2 digit we want to check '[0..1]'
      ver = IO.read(Sketchup.active_model.path, 50).unpack('m*').pack('m').sub(/\D+/,'')[0..1]
      # to check, we ask if the first '[0]' is a '1', if it is we use both, if not we only use it 
      ver[0].to_i == 1 ? ver ; ver = ver[0].chr
      puts ver

TIG

As I said in my first posted code - it was only tested in Ruby2 [v2014/2015]...
As @sdmitch says you need to do it slightly differently in <=v2013 - the vv[0] is NOT the character as it would be with >=v2014, but the 'octal' code which needs translating with .chr...
For v8/2013 my version should then be:

vv=File.open(skp_path, 'rb'){|f| f.read }.unpack('m*').pack('m').gsub(/SketchUpModel/,'').to_i.to_s;if vv[0].chr=='1';v=vv[0].chr+vv[1].chr;else;v=vv[0].chr;end

Then 'v' is the version as '8', '13', '14 or '15'.
For Sup versions >2013 [with Ruby2] you must omit all of the .chr codes...

glro

so it is much more complex than what i thought i understood..

programming ruby for sketchup is a never ending game

thank you all for the details

tt_su

unpack("m*").pack("m") gobbles up some characters. Here's an old snippet I used in the past to sniff out the version number: (Works for Ruby 1.8 and 2.0)

<span class="syntaxdefault"><br />module&nbsp;Example<br /><br />&nbsp;&nbsp;def&nbsp;self</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">read_skp_version</span><span class="syntaxkeyword">(</span><span class="syntaxdefault">file</span><span class="syntaxkeyword">)<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span class="syntaxcomment">#&nbsp;Get&nbsp;the&nbsp;size&nbsp;of&nbsp;the&nbsp;file&nbsp;ID&nbsp;block;<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span class="syntaxdefault">id_size&nbsp;</span><span class="syntaxkeyword">=&nbsp;</span><span class="syntaxdefault">IO</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">read</span><span class="syntaxkeyword">(</span><span class="syntaxdefault">file</span><span class="syntaxkeyword">,&nbsp;</span><span class="syntaxdefault">1</span><span class="syntaxkeyword">,&nbsp;</span><span class="syntaxdefault">3</span><span class="syntaxkeyword">).</span><span class="syntaxdefault">unpack</span><span class="syntaxkeyword">(</span><span class="syntaxstring">'C'</span><span class="syntaxkeyword">)[</span><span class="syntaxdefault">0</span><span class="syntaxkeyword">]&nbsp;*&nbsp;</span><span class="syntaxdefault">2<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span class="syntaxcomment">#&nbsp;=>&nbsp;28<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;#&nbsp;Get&nbsp;the&nbsp;size&nbsp;of&nbsp;the&nbsp;file&nbsp;version&nbsp;block;<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span class="syntaxdefault">version_size&nbsp;</span><span class="syntaxkeyword">=&nbsp;</span><span class="syntaxdefault">IO</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">read</span><span class="syntaxkeyword">(</span><span class="syntaxdefault">file</span><span class="syntaxkeyword">,&nbsp;</span><span class="syntaxdefault">1</span><span class="syntaxkeyword">,&nbsp;</span><span class="syntaxdefault">4&nbsp;</span><span class="syntaxkeyword">+&nbsp;</span><span class="syntaxdefault">id_size&nbsp;</span><span class="syntaxkeyword">+&nbsp;</span><span class="syntaxdefault">3</span><span class="syntaxkeyword">).</span><span class="syntaxdefault">unpack</span><span class="syntaxkeyword">(</span><span class="syntaxstring">'C'</span><span class="syntaxkeyword">)[</span><span class="syntaxdefault">0</span><span class="syntaxkeyword">]&nbsp;*&nbsp;</span><span class="syntaxdefault">2<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span class="syntaxcomment">#&nbsp;=>&nbsp;20<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;#&nbsp;Get&nbsp;the&nbsp;version&nbsp;block&nbsp;data.&nbsp;This&nbsp;will&nbsp;be&nbsp;UTF-16LE&nbsp;encoded.&nbsp;Since&nbsp;Ruby&nbsp;1.8<br />&nbsp;&nbsp;&nbsp;&nbsp;#&nbsp;doesn't&nbsp;have&nbsp;the&nbsp;encoding&nbsp;methods&nbsp;we&nbsp;hack&nbsp;it&nbsp;by&nbsp;zapping&nbsp;out&nbsp;all&nbsp;the&nbsp;zero&nbsp;bytes<br />&nbsp;&nbsp;&nbsp;&nbsp;#&nbsp;in&nbsp;the&nbsp;data&nbsp;string&nbsp;which&nbsp;will&nbsp;give&nbsp;us&nbsp;a&nbsp;regular&nbsp;ASCII&nbsp;string.&nbsp;This&nbsp;works<br />&nbsp;&nbsp;&nbsp;&nbsp;#&nbsp;because&nbsp;we&nbsp;know&nbsp;the&nbsp;version&nbsp;string&nbsp;is&nbsp;within&nbsp;the&nbsp;ASCII&nbsp;range.<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span class="syntaxdefault">version&nbsp;</span><span class="syntaxkeyword">=&nbsp;</span><span class="syntaxdefault">IO</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">read</span><span class="syntaxkeyword">(</span><span class="syntaxdefault">file</span><span class="syntaxkeyword">,&nbsp;</span><span class="syntaxdefault">version_size</span><span class="syntaxkeyword">,&nbsp;</span><span class="syntaxdefault">4&nbsp;</span><span class="syntaxkeyword">+&nbsp;</span><span class="syntaxdefault">id_size&nbsp;</span><span class="syntaxkeyword">+&nbsp;</span><span class="syntaxdefault">4</span><span class="syntaxkeyword">).</span><span class="syntaxdefault">gsub</span><span class="syntaxkeyword">(</span><span class="syntaxstring">"\x00"</span><span class="syntaxkeyword">,</span><span class="syntaxstring">""</span><span class="syntaxkeyword">)<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span class="syntaxcomment">#&nbsp;=>&nbsp;{15.1.106}<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;#&nbsp;Extract&nbsp;the&nbsp;version&nbsp;components.<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span class="syntaxdefault">version</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">match</span><span class="syntaxkeyword">(/\{(\</span><span class="syntaxdefault">d</span><span class="syntaxkeyword">+)\.(\</span><span class="syntaxdefault">d</span><span class="syntaxkeyword">+)\.(\</span><span class="syntaxdefault">d</span><span class="syntaxkeyword">+)\}/).</span><span class="syntaxdefault">captures</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">map&nbsp;</span><span class="syntaxkeyword">{&nbsp;|</span><span class="syntaxdefault">x</span><span class="syntaxkeyword">|&nbsp;</span><span class="syntaxdefault">x</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">to_i&nbsp;</span><span class="syntaxkeyword">}<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span class="syntaxcomment">#&nbsp;=>&nbsp;[15,&nbsp;1,&nbsp;106]<br />&nbsp;&nbsp;</span><span class="syntaxdefault">end<br /><br />end&nbsp;</span><span class="syntaxcomment">#&nbsp;module<br /><br />#&nbsp;Example&nbsp;usage;<br /></span><span class="syntaxdefault">major</span><span class="syntaxkeyword">,&nbsp;</span><span class="syntaxdefault">minor</span><span class="syntaxkeyword">,&nbsp;</span><span class="syntaxdefault">revision&nbsp;</span><span class="syntaxkeyword">=&nbsp;</span><span class="syntaxdefault">Example</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">read_skp_version</span><span class="syntaxkeyword">(</span><span class="syntaxdefault">Sketchup</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">active_model</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">path</span><span class="syntaxkeyword">)<br />&nbsp;</span><span class="syntaxdefault"></span>