Question

Empty row

Asked by: firekiller15

delphi
Hi how to compare if one of the row is empty

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

1

12

5

how to make it
1
5
12
empty
empty

i try to sort above but receive error message " '' is not a valid integer"



my code is below

PRec = ^Rec;
Rec = record
StudentID: string;
 
...
 
procedure TfrmAddNU.virtualstringtreeTestingCompareNodes(Sender: TBaseVirtualTree; Node1,
var
testing:PRec;
begin
case Column of
    0: Result := StrToInt(Testing.numberofball) - StrToInt(Testing.numberofball);
end;   
end;

                                  
1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:

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Asked On
2008-09-11 at 23:52:15ID23725523
Tags

delphi

Topic

Delphi Programming

Participating Experts
4
Points
250
Comments
8

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Answers

 

by: kretzschmarPosted on 2008-09-12 at 00:19:18ID: 22457706

you could use a function which may handle this exception like

function getInt(AValue : AString) : Integer;
begin
  try
    result := StrToInt(AValue);
  except
    result := 0; //or -1, as you want
  end;
end;

so the call could be changed to

   0: Result := getInt(Testing.numberofball) - getInt(Testing.numberofball);

another way is to store the StudentID in the record as a integer instead of use of a string

meikl ;-)

 

by: ThievingSixPosted on 2008-09-12 at 00:25:24ID: 22457718

Why not just do

0: Result := StrToIntDef(Testing.numberofball,0) - StrToIntDef(Testing.numberofball,0);

StrToIntDef = String to integer default. So if the passed integer isn't an integer it defaults to the second number.

 

by: firekiller15Posted on 2008-09-12 at 00:46:09ID: 22457791

if i have 3 row
test1
test3
test10

when i do sorting i will become
test1
test10
test3
 
how to sort it according to their number if 2 or more name is the same

 

by: ziolkoPosted on 2008-09-12 at 00:56:06ID: 22457825

>>Why not just do

>>0: Result := StrToIntDef(Testing.numberofball,0) - StrToIntDef(Testing.numberofball,0);

that was my last post in previous question:)

ziolko.

 

by: Geert_GruwezPosted on 2008-09-12 at 02:18:35ID: 22458131

and this mine:

Result := CompareText(Format('%20:s', [Testing.NumberOfBall]), Format('%20:s', [Testing.NumberOfBall]));

 

by: Geert_GruwezPosted on 2008-09-12 at 02:22:52ID: 22458140

actually if you want the empty ones last :

Result := CompareText(Format('%20:s', [StringReplace(Testing.NumberOfBall, ' ', Chr(254), [rfReplaceAll])]), Format('%20:s', [StringReplace(Testing.NumberOfBall, ' ', Chr(254), [rfReplaceAll])]));

 

by: Geert_GruwezPosted on 2008-09-12 at 02:24:17ID: 22458146

1
5
12
empty
empty

will become
     1
     5
    12
      
      

 

by: Geert_GruwezPosted on 2008-09-12 at 02:25:03ID: 22458150

hmm guess you can't see char 254 with text

20120131-EE-VQP-002

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