Question

compare

Asked by: firekiller15

delphi
Hi how to compare a string with integer as below

example
currently im using comparetext.
when i try to sort integer value i get as below

Filename1
Filename10
Filename101
Filename2
Filename3

how to make it
Filename1
Filename2
Filename3
Filename10
Filename101


my code is below

PRec = ^Rec;
Rec = record
Filename: string;
 
...
 
procedure TfrmAddNU.virtualstringtreeTestingCompareNodes(Sender: TBaseVirtualTree; Node1,
var
testing:PRec;
begin
  Testing1 := PRec(virtualstringtreeTesting.GetNodeData(Node1));
  Testing2 := PRec(virtualstringtreeTesting.GetNodeData(Node2));
case Column of
    0: Result := CompareText(Testing1.Filename, Testing2.Filename);
end;   
end;
                                  
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Asked On
2008-09-14 at 20:01:02ID23730853
Tags

delphi

Topic

Delphi Programming

Participating Experts
3
Points
250
Comments
8

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Answers

 

by: TheRealLokiPosted on 2008-09-14 at 20:25:11ID: 22475782

 if length(testing1) < length(testing2) then result := -1 else if length(testing1) > length(testing2) then result := 1
  else
    result := CompareText( TMyString(p1).Value, TMyString(p2).Value );

 

by: firekiller15Posted on 2008-09-14 at 22:48:15ID: 22476071

where should i place your code above
or should i create a new method for the code.

>> result := CompareText( TMyString(p1).Value, TMyString(p2).Value );
where you get TmyString(p1)
should i add 0: result?

 

by: TheRealLokiPosted on 2008-09-14 at 22:51:24ID: 22476083

a fuller example using your code...

procedure TfrmAddNU.virtualstringtreeTestingCompareNodes(Sender: TBaseVirtualTree; Node1,
var
testing:PRec;
begin
  Testing1 := PRec(virtualstringtreeTesting.GetNodeData(Node1));
  Testing2 := PRec(virtualstringtreeTesting.GetNodeData(Node2));
case Column of
    0: begin
          if length(testing1.Filename) < length(testing2.Filename) then result := -1
          else if length(testing1.Filename) > length(testing2.Filename) then result := 1
          else
            Result := CompareText(Testing1.Filename, Testing2.Filename);
        end;
end;

 

by: firekiller15Posted on 2008-09-14 at 23:07:00ID: 22476132

now it become

example

filename1
filename12
testfilename
filename12345

how to sort it as

filename1
filename12
filename12345
testfilename

 

by: Geert_GruwezPosted on 2008-09-15 at 00:01:40ID: 22476319

this can't work unless you write some special rules
sort a section beginning with filename and sort beginning with test,  etc
but what if they differ ???

and why would you want to sort that complicated anyway ?
why not just a numeric or alphabetic sort.

users looking for a line will not know where to look,
or they will have to figure out your special rules first ???

procedure TfrmAddNU.virtualstringtreeTestingCompareNodes(Sender: TBaseVirtualTree; Node1,
var
testing:PRec;
begin
  Result := 0;
  Testing1 := PRec(virtualstringtreeTesting.GetNodeData(Node1));
  Testing2 := PRec(virtualstringtreeTesting.GetNodeData(Node2));
  case Column of
    0: Result := CompareText(Format('%20.s', [Testing1.FileName]), Format('%20.s', [Testing2.FileName]));
  end;
end;

                                              
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by: Geert_GruwezPosted on 2008-09-15 at 00:10:12ID: 22476354

or extract a number first if any

and sort it by the numbers if both have numbers

procedure TfrmAddNU.virtualstringtreeTestingCompareNodes(Sender: TBaseVirtualTree; Node1,
var testing1, testing2:PRec;
  F1, F2: Double;
  C1, C2: integer;
begin
  Result := 0;
  Testing1 := PRec(virtualstringtreeTesting.GetNodeData(Node1));
  Testing2 := PRec(virtualstringtreeTesting.GetNodeData(Node2));
  case Column of
    0: 
    begin
      Result := CompareText(Format('%20.s', [Testing1.FileName]), Format('%20.s', [Testing2.FileName]));
      Val(Testing1.FileName, F1, C1);
      Val(Testing2.FileName, F2, C2);
      if (C1 = 0) and (C2 = 0) then 
        Result := CompareText(Format('%20.f', [F1]), Format('%20.f', [F2]));
    end;
  end;
end;

                                              
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by: TheRealLokiPosted on 2008-09-15 at 04:30:58ID: 22477496

I didn't realise "testfilename" was a possibility...
you didn't list it in your question description.
As Geert says, you will need to make some "rules"
If you can't think of the rules, then give us the biggest range of filenames you can think of, and then tell us what order they should appear in, and we'll pose some algorithms for you to choose.

 

by: huferryPosted on 2008-09-22 at 03:47:29ID: 22538796

Replace you CompareText function with CompareNumberedText below:

function ExtractTailNumber(AText: string): Integer;
var
  Str: string;
begin
  Str := Trim(AText);

  // stripping the alpha character
  while (Length(Str)>0) and not (Str[1] in ['0'..'9']) do
  begin
    Delete(Str,1,1);
  end;

  Result := StrToIntDef(Str, 0);
end;

function ExtractHeadString(AText: string): string;
var
  Str: string;
begin
  Str := Trim(AText);
  Result := '';

  // getting the heading the alpha character
  while (Length(Str)>0) and not (Str[1] in ['0'..'9']) do
  begin
    Result := Result + Str[1];
    Delete(Str,1,1);
  end;

end;

function CompareNumberPart(AText1, AText2: string): Integer;
begin
  Result := CompareValue(ExtractTailNumber(AText1), ExtractTailNumber(AText2));
end;

function CompareAlphaPart(AText1, AText2: string): Integer;
begin
  Result := CompareText(ExtractHeadString(AText1), ExtractHeadString(AText2));
end;

function CompareNumberedText(AText1, AText2: string): Integer;
begin
  Result := CompareAlphaPart(AText1, AText2);
  if Result=0 then
    Result := CompareNumberPart(AText1, AText2);
end;

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