Set of Char in XE8 gives compiler warnings - how to re-code? [Edit]
I have code like this:
{code}
const
{Characters not allowed in file names.}
FileNameForbiddenChars: set of Char = ['<', '>', '|', '"', '\', '/', ':', '*', '?','&']; // note: Some of these, while technically legal, cause issues elsewhere
function IsValidFileName(Filename:String):Boolean;
{
Returns "True" if file name is legal/valid in Windows.
Note: This is for FILE NAMES not full file paths, so will return false
for a path like "C:\MyFile.txt"
}
var
I: integer;
begin
Result:=Filename<>'';
for I:=1 to Length(Filename) do
Result:=Result and not (Filename[I] in FileNameForbiddenChars);
end;
{code}
This gives the compiler warning:
+[dcc32 Warning] Unit1.pas(312): W1050 WideChar reduced to byte char in set expressions. Consider using 'CharInSet' function in 'SysUtils' unit.+
What would you suggest I change in order to eliminate this compiler warning, while still keeping my constant defined outside of the function as a set?
Note: The above is just a sample of code for a general issue.
Thanks!
Carl.
Edited by: Carl Olsen on Jun 30, 2015 11:39 AM
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Carl
6/30/2015 6:40:23 PM
embarcadero.delphi.general
4258 articles. 
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Carl wrote:
> I have code like this:
<snip>
> This gives the compiler warning:
>
> +[dcc32 Warning] Unit1.pas(312): W1050 WideChar reduced to byte char
> in set expressions. Consider using 'CharInSet' function in 'SysUtils'
> unit.+
As it should be. In Delphi 2009, Char was changed from AnsiChar to WideChar.
A "Set of Char" would thus produce a Set of up to 65535 elements, not 256
elements like before. However, a Set cannot hold more than 256 elements,
so the compiler has no choice but to truncate your Char values to 8bit instead,
thus the warning. Which is fine as long as your filenames only contain ASCII
characters. But if they contain non-ASCII characters, you are going to lose
precision in your comparisons.
> What would you suggest I change in order to eliminate this compiler
> warning, while still keeping my constant defined outside of the
> function as a set?
You could do what the compiler warning says - use the SysUtils.CharInSet()
function:
{code}
const
{Characters not allowed in file names.}
FileNameForbiddenChars: TSysCharSet = ['<', '>', '|', '"', '\', '/', ':',
'*', '?', '&']; // note: Some of these, while technically legal, cause issues
elsewhere
function IsValidFileName(Filename:String):Boolean;
{
Returns "True" if file name is legal/valid in Windows.
Note: This is for FILE NAMES not full file paths, so will return false
for a path like "C:\MyFile.txt"
}
var
I: integer;
begin
Result := Filename <> '';
for I := 1 to Length(Filename) do
Result := Result and not CharInSet(Filename[I], FileNameForbiddenChars);
end;
{code}
However, that is not really any better, as each Char will still be truncated
to 8bit, CharInSet() merely hides the warning from you.
If you support Unicode characters, you can't use a Set anymore. Re-write
the code, eg:
{code}
const
{Characters not allowed in file names.}
FileNameForbiddenChars: string = '<>|"\/:*?&'; // note: Some of these,
while technically legal, cause issues elsewhere
function IsValidFileName(Filename:String):Boolean;
{
Returns "True" if file name is legal/valid in Windows.
Note: This is for FILE NAMES not full file paths, so will return false
for a path like "C:\MyFile.txt"
}
var
I, J: integer;
begin
Result := Filename <> '';
for I := 1 to Length(Filename) do
Result := Result and (Pos(Filename[I], FileNameForbiddenChars) = 0);
end;
{code}
However, there is a small performance hit when passing a single Char to Pos().
You might not notice it for small filenames. But, if you want to avoid
that hit, you can do this instead:
{code}
const
{Characters not allowed in file names.}
FileNameForbiddenChars: string = '<>|"\/:*?&'; // note: Some of these,
while technically legal, cause issues elsewhere
function IsValidFileName(Filename:String):Boolean;
{
Returns "True" if file name is legal/valid in Windows.
Note: This is for FILE NAMES not full file paths, so will return false
for a path like "C:\MyFile.txt"
}
var
I: integer;
Tmp: String;
begin
Result := False;
if Filename <> '' then
begin
SetLength(Tmp, 1);
for I := 1 to Length(Filename) do
begin
Tmp[1] := Filename[I];
if Pos(Tmp, FileNameForbiddenChars) <> 0 then
Exit;
end;
Result := True;
end;
end;
{code}
Or this:
{code}
const
{Characters not allowed in file names.}
FileNameForbiddenChars: string = '<>|"\/:*?&'; // note: Some of these,
while technically legal, cause issues elsewhere
function IsValidFileName(Filename:String):Boolean;
{
Returns "True" if file name is legal/valid in Windows.
Note: This is for FILE NAMES not full file paths, so will return false
for a path like "C:\MyFile.txt"
}
var
I, J: integer;
C: Char;
begin
Result := False;
if Filename <> '' then
begin
for I := 1 to Length(Filename) do
begin
C := Filename[I];
for J := 1 to Length(FileNameForbiddenChars) do begin
if FileNameForbiddenChars[J] = C then Exit;
end;
end;
Result := True;
end;
end;
{code}
--
Remy Lebeau (TeamB)
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Remy
6/30/2015 8:36:08 PM
Wow, Remy - you are a fountain of awesomeness! Thank you once again! > Remy Lebeau (TeamB)
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Carl
6/30/2015 8:51:01 PM
Remy, Thanks for your earlier reply on this. I have things working nicely on my side thanks to your input. One thing has been bugging me a bit, though, that I don't understand in your statement below: >As it should be. In Delphi 2009, Char was changed from AnsiChar to WideChar. >A "Set of Char" would thus produce a Set of up to 65535 elements, not 256 >elements like before. However, a Set cannot hold more than 256 elements, >so the compiler has no choice but to truncate your Char values to 8bit instead, >thus the warning. I would think that a set would still be 256 elements regardless of whether Char, AnsiChar, WideChar, etc., and that the penalty of a set of WideChar vs AnsiChar is that you would have a set of 256 Words instead of a set of 256 bytes, but in both cases, a set would be limited to 256 elements. Why is it that a set of WideChar would become 65535 elements all of a sudden? I would think that each individual element would be able to store a value of 65535, since it's two bytes, but I would not expect the set to become an array[0..65535] of WideChar.
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Carl
7/6/2015 8:32:18 PM
Carl wrote: > I would think that a set would still be 256 elements regardless of > whether Char, AnsiChar, WideChar, etc., and that the penalty of > a set of WideChar vs AnsiChar is that you would have a set of > 256 Words instead of a set of 256 bytes Only if you explicitly restrict the Set to 256 elements, but you are not doing that. You are declaring an unbound "Set of Char", which creates a Set that encompasses the entire range of Low(Char)..High(Char) (and you are then populating the Set with only a few select characters, but space for the other characters still has to be allocated). When Char was an alias for AnsiChar in Delphi 2007 and earlier, High(Char) was 255, and all was fine as Low(Char)..High(Char) was 256 elements. But now that Char is an alias for WideChar in Delphi 2009+, High(Char) is 65535 now, so Low(Char)..High(Char) is 65536 elements, which is too many. > Why is it that a set of WideChar would become 65535 elements all of > a sudden? I would think that each individual element would be able to > store a value of 65535, since it's two bytes, but I would not expect > the set to become an array[0..65535] of WideChar. Because High(WideChar) is 65535, thus Low(Char)..High(Char) (0..65535) is 65536 elements. It seems you have a fundamental misunderstanding what how a Set really works. A Set is not an array of values, like you are thinking. It is actually an array of bits, where each allowed value within the Set's range is represented by a single bit, the Set does not hold the actual values. So, 8 values in the Set can be stored in a single Byte in memory, up to 32 bytes total for a 256-element Set. Set operations like Include()/Exclude(), "value in Set", "Set +/- [values]", etc are very fast and efficient, because they are simply querying/twiddling individual bits, not whole values. A Set is physically restricted to 256 bits max, and thus can only represent 256 values, regardless of the byte size of the element type. So, when Char is WideChar, a "Set of Char" cannot represent all of the values that a WideChar can contain, thus the compiler warning when it has to truncate WideChar values in Set expressions. If Sets larger than 256 elements were allowed, a "Set of Char" for WideChar values would take up 8K of memory (65536 bits) max. With your thinking, an array of 65536 2-byte whole values would take up 128K of memory, and be extremely slow in comparison. -- Remy Lebeau (TeamB)
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Remy
7/6/2015 9:36:49 PM
>It seems you have a fundamental misunderstanding what how a Set really works. Wow - you are absolutely right! I am glad we had this conversation, because I had it all wrong in my head. Thanks!!
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Carl
7/6/2015 10:22:29 PM
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Re-compiling vcl170.dpk of Delphi XE3 Update 2 (17.0.4770.56661) [Edit]
We want to migrate from Delphi 7 to Delphi XE3. After migrate, all things okay but we set Application.BiDiKeyboard and Application.NonBiDiKeyboard, when user want to switch between controls, there is a delay about 1 sec for each transition. I search and review the problem and see that it is a bug! of Windows 7 and above. When VCL call LoadKeyboardLayout in TWinControl.CMEnter(var Message: TCMEnter); this delay occurred. Considering a form with a lots of controls, loading the form was very slow and switching between controls are hard, specially for users that work alot with keyboard. I try t...
Re: calling a c++ function from Delphi [Edit] [Edit]
costa basil wrote: > Sorry, I posted it here because different people read different lists > and c++ guys might not read the delphi lists and vice-versa and I > want to pick-up all brains... And yet, it is not allowed. -- Rudy Velthuis (TeamB) http://www.teamb.com "This isn't right, this isn't even wrong." -- Wolfgang Pauli (1900-1958), upon reading a young physicist's paper ok, understood. ...
Code works in Delphi 7 but not in Delphi 2010 [Edit]
hello, i have a procedure that open's a file by passing the file name as the parameter to the executable. something like this {code} C : \ P r o g r a m F i l e s \ Da c k e r \ D r a c k e r . e x e " G : \ D E l p h i 7 \ D e l p h i 7 A p p _ l o g . t " {code} The source code is {code} procedure OpenFileWithExe var hReg: HKEY; Ret: Longint; RegDataType, RegDataSize: DWORD; CmdLine: array [0..560] of Char; Len: Integer; SInfo: TStartupInfo; PInfo: TProcessInformation; begin Ret := windows.RegOpenKeyEx(HKEY_CURRENT_USER, ...
Re: Maybe is a new life for Delphi? [Edit] [Edit]
Cesar Romero wrote: > > This is not ad. Sparta is not commercial product. > > Any product announcement should be in 3rd party group, comercial or > not, that is part of newsgroup guidelines. Right. -Craig [moderator] -- Craig Stuntz · Vertex Systems Corp. · Columbus, OH Delphi/InterBase Weblog : http://blogs.teamb.com/craigstuntz/ ...
Re: compile problem c++ 2009 [Edit] [Edit]
Antonio Estevez <amelsoft@terra.es> wrote: >> Again a bit further, but now the next errors: >> >> static unsigned int nr_of_links = ((sizeof( log_link_array )) / >> (sizeof(log_link_array[0]))); >> >> [BCC32 Warning] PatsupFunctionelelaag.h(405): W8058 Cannot create >> pre-compiled header: initialized data in header > >That's a warning, not an error. Agreed, but it's probably worth trying to clear up, just for build times. In this case, (and bearing in mind I don't have CB2009, so I'm unsure quite how fussy...
Attempting to compile Delphi 5 code in Delphi XE5 is failing
Greetings All, If I'm not in the correct formum please tell me which one I should be in. Just upgraded to Delphi XE5 and am attempting to compile one of my Delphi 5 projects. I used Interbase Express I use either TDataSource -> TCDSProvider -> TDataSetProvider -> TIBQuery or TDataSource -> TClientDataSet -> TDataSetProvider -> TIBQuery Also used TIBDatabase, TIBTransaction, and TIBStoredProc I open the smallest project I have and click compile and almost immediately I receive this error Checking project dependencies... Compiling CITranEngine.dproj...
Delphi 2006 product activation (re end of support for Delphi 2006) [Edit]
Apologies if this question has been asked and answered elsewhere, but I recently got an email informing me support for Delphi 2006 was going to be dropped. I have mostly converted to Delphi 2009 now, but I'll still be able to activate my copy of 2006 on any future installation right? Edited by: David Howes on Jul 18, 2009 9:53 AM David Howes wrote: > Apologies if this question has been asked and answered elsewhere, but I recently got an email informing me support for Delphi 2006 was going to be dropped. I have mostly converted to Delphi 2009 now, but I'll still be able to acti...
FastScript in Delphi XE8
I am converting from Delphi 2006 to Delphi XE8, and am now nearing the finish line, but have one remaining major roadblock: FastScript I use Fastscript very heavily as a way to allow our users to write scripts that can extend our software as much as they like, including creating forms and adding buttons. This is not working. A specific problem that I have, is that code that works great in Delphi 2006 does not work in Delphi XE8. Specifically, if my script contains a reference to a "TForm", or "TBitBtn" (as well as many other components), then FastScript will return ...
FastScript in Delphi XE8
*Edit: This is now solved, but I leave the original message below for reference. The solution was essentially to delete all traces of FastReports (That's "Reports", not "Script") from the computer, as it was interfering with FastScript. This was actually fairly involved to do, and we did it under the supervision of someone from FastScript tech support, who was extremely helpful. If you run into the problem described below, be sure to contact their technical support and see if maybe you are experiencin g the same issue, and how to resolve it. I hope this is helpfu...
Best practice when code should still compile with elder versions of Delphi but also Delphi 2009
When tryung to compile Turbopower Orpheus and other Turbopower products which I still use in my applications and therefor need to convert to Delphi 2009, I get lots of warnings even though others has made it possible to get Orpheus compiled. The problem is checking a char in a set which gives a type cast warning and suggests using a new function instead. [DCC Warning] ovcdbnum.pas(401): W1050 WideChar reduced to byte char in set expressions. Consider using 'CharInSet' function in 'SysUtils' unit. So what would be the best practice here eg. correcting this ro...
Error: "Query: dataset not in Edit mode": in delphi code for Rave Report [Edit]
I am trying to write a Delphi code (Delphi 2010) to print a rave report from the access database; I am using RVSystemprint method; q1 is a query name. I get error message " q1: dataset not in edit or insert mode", at the line: while not q1.Eof. Even though I added q1.Edit or q1.insert, it doesn't work. Database's readonly property is FALSE. What is missing in the code? Thanks. procedure TForm1.rsysPrint(Sender: TObject); begin with Sender as TBaseReport do begin ..... q1.Open; q1.Edit; q1.first; while not q1.Eof do begin ... end; .... ...
YOU RE-SET MY SETTINGS!!
Name: Product: Firefox Summary: YOU RE-SET MY SETTINGS!! Comments: I AM VERY, VERY UNHAPPY THAT YOUR UM-ANNOUNCED DOWNLOAD TO MY COMPUTER DHANGES MY FIREFOX SETTINGS!!!!! ENOUGH SO... THAT IF / WHEN IF HAPPENS AGAIN? I WILL PERMANENTLY SWITCH TO ANOTHER BROWSER!! WHAT IS PARTICULARLY GALLING IS HAT I HAVE CONVINCED DOZENS OF FRIENDS TO FIREFOX! STOP ^%$^*%$& WITH MY FIREFOX SETTINGS!!!!!!!!!!!!!! Browser Details: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1.5) Gecko/20091102 Firefox/3.5.5 (.NET CLR 3.5.30729) From URL: http://hendrix.mozilla.org/ Note to...
RE: RE: RE: RE: [wxperl-users] wxTreeCtrl, edit an treeItem
>>Found a fix ( I hope ); download the modified wx22_9.dll from >>http://wwwstud.dsi.unive.it/~mbarbon/wx/wx22_9.dll.gz >>uncompress it and put it in $PERL/site/lib/auto/Wx >>( make a backup of the original one, of course ). >>This fixes your problem with tree control, but may introduce >>new ones ( it is a fix backported from wxWIndows 2.3 ). >> >>Regards >>Mattia > >hey thanks man! >i had no time to work on my application but i checked the wxwindows >mailinglist archive. you asked for a code change as workaround......
set of char and Delphi 2009
In delphi, it is not possible to use 'set of word' because of its big memory requirement (But I think 64KB is not a big memory nowadays and it is applicable). Therefore, 'set of char' will not be compiled in Delphi 2009 (I haven't tried D2009 yet). myset:=['a','d'..'x']; if mychar in myset then ... What do you recommend, how to change this code to be compiled in Delphi 2009 without speed decrease? "Samir Shagavatov" <samir105@gmail.com> skrev i meddelelsen news:10065@forums.codegear.com... > In delphi, it is not possibl...
compiled code has grown again! [Edit]
Every new version of cbuilder makes the compiled code grow. xe2 6,025,728 xe 4,922,368 and I remember being shocked at how big it was moving to xe. and I remember being shocked at how big it was moving to rad studio. and so on. The code hasn't changed substantially over the last couple of years, yet it has more then doubled in size. Is there a way go move back to smaller code while keeping xe2? > {quote:title=Chris Bruner wrote:}{quote} > Every new version of cbuilder makes the compiled code grow. > > xe2 6,025,728 > xe 4,922,368 > Is there a wa...
Web resources about - Set of Char in XE8 gives compiler warnings - how to re-code? [Edit] - embarcadero.delphi.general
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