Hi John > Extra question: > > It looks like code like > > for i:=1 to length(string1) do > begin > DoSomethingWithOneChar(string1[i]); > end; > > cannot be used reliably.
I think the solution here is to not to concentrate so much on unicode, but rather on what DoSomethingWithOneChar() is trying to achieve. Does the function even make sense for non-ANSI characters? Todd. > The problems are that length(string1) looks like > it cannot be safely used - as unicode characters may include 2 codepoints > and length(string1) highlights that there is a difference between the number > of unicode characters in a string and the number of codepoints. Still > figuring out what is the best practice here, as I have quite a lot of string > routines. Should be be OK as long as the unicode text actually is ASCII. > > Q2 – With XE do the .pas and .dfm files become unicode text and hence cannot > be read by earlier Delphi, eg D2007 any more? > > Answer - Is a project option from what I have read?, yes not portable if > unicode. > > Q3 – I do a lot of reading ascii data files, and writing back. Using > mainly TFilestream and stringlists. Does this in general mean I will need > to use file variables declared as Ansichar and AnsiString instead of Char > and String? > (I would prefer to use the standard VCL where possible) > > If I have variables > as1:Ansistring; > s2:string; > > Q4 – if I do s2:=as1 does this convert ansistrings to unicode? > > Answer - yes, there are performance issues to watch out for if conversion > happens a lot. > > Q5 – if I do as1:=s2 does this convert a unicode string to ansistring? > > (otherwise how do I do this?) > > Answer - yes, there are performance issues to watch out for if conversion > happens a lot. > > Q6 – I understand any code like > > char1:=string1[i]; > if char1 in [‘a’..’z’] then > begin > message:=string[i]+’ - character is lowercase’; > end > > will break, as ansi characters are ordinal (less than 256 or 512) > and set comparisons ['a'..'z'] or ['a','b','c'] can be used, this set > code cannot be used for unicode characters. What is the replacement? > > Answer - There is CharInSet call and numerous extra housekeeping functions > added in TCharacter. > > Q7 – do literals like #13#10 still mean carriage return and linefeed? #9 > means tab? > if I have code like (logline string1 string2 are string) > > logline:=FormatDateTime(‘dd-mmm-yyyy hh:nn:ss’,now) + string1 + > #13#10+#9 + string2; > ShowMessage(logline); > Button1.hint:=logline; > writeln(f,logline); > > these work D5-D2007 - ie a 2 line messagebox text, 2 line hint, > and 2 lines written to a log file. > is this still going to work? > > do carriage returns/tabs/other control characters have to be defined > differently, eg as constants? > > Answer - not figured out yet - anyone else know? > > Q8 – stringlist1.loadfromfile(‘Test1.txt’); > what happens if this file is ascii text being read into a stringlist > which is unicode strings. > > Answer - Default is Ascii text for loadfromfile and savetofile, use > overloaded routines for Unicode > > Q9 - stringlist1.savetofile(‘Test1.txt’) > presumably this is no longer ascii text. How do I save and read a > stringlist to/from a file if it is to be Ansi text? > > Q10 – If there are complexities in Q8 and Q9 is there a TAnsiStringlist > type (for ansistrings) as well as a unicode TStringlist type? > (I use stringlists a lot) > > Answer - unicodestring lists can save to ascii or unicode files, so > TAnsiStringlist not needed. > > Q11 – do inifiles become unicode too? > > Answer - looks like no? Not clear? Anyone else know? > > Q12 – does Windows Notepad open unicode text files correctly? or can it > only be used on Ansi text files? > > Anyone know this? > > Q13 - It looks like most programmers editors read and write ascii and > unicode encoding.....the one I use seems to distinguish between UTF-8 and > unicode as well – what is the difference? > > Anyone know this? > > John > > _______________________________________________ > NZ Borland Developers Group - Delphi mailing list > Post: delphi@delphi.org.nz > Admin: http://delphi.org.nz/mailman/listinfo/delphi > Unsubscribe: send an email to delphi-requ...@delphi.org.nz with Subject: > unsubscribe > > _______________________________________________ > NZ Borland Developers Group - Delphi mailing list > Post: delphi@delphi.org.nz > Admin: http://delphi.org.nz/mailman/listinfo/delphi > Unsubscribe: send an email to delphi-requ...@delphi.org.nz with Subject: > unsubscribe _______________________________________________ NZ Borland Developers Group - Delphi mailing list Post: delphi@delphi.org.nz Admin: http://delphi.org.nz/mailman/listinfo/delphi Unsubscribe: send an email to delphi-requ...@delphi.org.nz with Subject: unsubscribe
