Planning upgrading from D2007 to XE, but want to read up on issues I will
need to consider first to do with strings becoming Unicode by default. I
recall the release of D2009 came with good white papers explaining
ramifications, however I haven’t seen these as I haven’t upgraded. Asked
for such also at the XE event but have not been sent anything yet.
I have a lot of code which I want to plan to be able to recompile easily,
and would like to plan this migration. I would prefer to put anything
contentious or varying into a library unit, a ‘wrapper’ so that I don’t have
to deal with these version differences in the main code...
Anyone can answer any of these quick questions please post here or email
me – thanks!
Q1 - Anyone got some good references to read up on ansistring to unicode
issues ? Comprehensive please!
Q2 – With XE do the .pas and .dfm files become unicode text and hence cannot
be read by earlier Delphi, eg D2007 any more?
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?
Q5 – if I do as1:=s2 does this convert a unicode string to ansstring?
(otherwise how do I do this?)
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?
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?
Q8 – stringlist1.loadfromfile(‘Test1.txt’);
what happens if this file is ascii text being read into a stringlist
which is unicode strings.
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)
Q11 – do inifiles become unicode too?
Q12 – does Windows Notepad open unicode text files correctly? or can it
only be used on Ansi text files?
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?
John
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