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MathGroup Archive 2006

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RE: Strange use of FrontEnd`FileName

  • To: mathgroup at smc.vnet.net
  • Subject: [mg71721] RE: [mg71664] Strange use of FrontEnd`FileName
  • From: "Philipp" <philipp.m.o at gmail.com>
  • Date: Mon, 27 Nov 2006 04:04:57 -0500 (EST)

Dear Li,

I never questioned that the FrontEnd`FileName wrapper (Head) worked in
the original statement, i.e., ToFileName accepted input wrapped in
FrontEnd`FileName. My question was, why it was necessary to wrap the
result of Extract in the FrontEnd`FileName Head, and why ToFileName
accepted input with FrontEnd`FileName. Even the error message caused by
your In[16], where you wrap the directory list in test, states that
"ToFileName::strse: String or list of strings expected at position 1
...".

Following your logic

In[1]:=  fn = "FileName" /. NotebookInformation[EvaluationNotebook[]]
Out[1]=  FrontEnd`FileName[{$RootDirectory, E:, Common, Desktop},
           Untitled-1.nb, CharacterEncoding -> WindowsANSI]

In[2]:=  ex0 = Extract[fn, {1}]
         ex1 = Extract[fn, {1}, FrontEnd`FileName]

Out[2]=  {, E:, Common, Desktop}
         FrontEnd`FileName[{$RootDirectory, E:, Common, Desktop}]

In[4]:=  ToFileName[ex0]
         ToFileName[ex1]

Out[4]=  E:\Common\Desktop\
         E:\Common\Desktop\

The last two statements still give the same answer, although ex1 has
FrontEnd`FileName wrapper,

In[6]:=  Head[ex0]
         Head[ex1]
         
Out[6]=  List
         FrontEnd`FileName

Cheers,

Philipp.

-----Original Message-----
From: À÷Õý¼ª [mailto:zhengji.li at gmail.com] 
Sent: Monday, November 27, 2006 9:16 AM
To: Philipp
Cc: mathgroup at smc.vnet.net
Subject: [mg71721] Re: [mg71664] Strange use of FrontEnd`FileName

Philipp,

Firstly, see what's happened with the use of extract.

In[8]:=
"FileName" /. NotebookInformation[EvaluationNotebook[]]
Out[8]=
FrontEnd`FileName[{$RootDirectory, "C:", Documents and Settings", ...,
     "Desktop"}, Untitled-2.nb, CharacterEncoding -> WindowsANSI]
In[9]:=
Extract["FileName" /. NotebookInformation[
    EvaluationNotebook[]], {1}, FrontEnd`FileName]
Out[9]=
FrontEnd`FileName[{$RootDirectory, "C:", Documents and Settings", ...,
     "Desktop"}]

Secondly, ToFileName really works with
FrontEnd`FileName[{$RootDirectory, "C:", Documents and Settings", ...,
 "Desktop"}]. Let's check it out:

In[16]:=
FrontEnd`FileName[{$RootDirectory, "C:", "Desktop"}] // ToFileName (*
This is OK*)
Remove[test];
test[{$RootDirectory, "C:", "Desktop"}] // ToFileName (* This is bad *)
{$RootDirectory, "C:", "Desktop"} // ToFileName (* OK, too *)
Out[16]=
C:\Desktop\


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