UDT Array Sort Problem

[Guest Close Wyman A Belts]

Hi Everyone,
I've got a problem with sorting an array of UDT's that consist
of integers. When the integers are less than 255 they get sorted
correctly, but when they get > 255 they don't sort correctly. I
read somewhere that PB sorts UDT's like strings, so I'm assuming
that what happens is that once I get above 255 I'm creating a nul
that the string sorting algorithm sees as the lowest "character"
and puts it first in the list. Just in case I'm not making any
sense, here's an example:
[code]
#Compile Exe
#Dim All
#Register None
#Include "Win32API.INC"

Type TwoInts
Int1 As Integer
Int2 As Integer
End Type

Function WinMain(ByVal hCurInstance As Long, _
ByVal hPrevInstance As Long, _
lpszCmdLine As Asciiz Ptr, _
ByVal nCmdShow As Long) Export As Long
Dim IntArray(1 To 3) As TwoInts
Dim Counter As Integer

'Init Array:
For Counter = 1 To 3
IntArray(Counter).Int1 = Counter
IntArray(Counter).Int2 = Counter
Next Counter

'Sort Array:
Array Sort IntArray(), From 3 To 4

'Display Expected Results:
MsgBox "Element 1 =" & Str$(IntArray(1).Int1) & Chr$(13) & _
"Element 2 =" & Str$(IntArray(2).Int1) & Chr$(13) & _
"Element 3 =" & Str$(IntArray(3).Int1)

'Change The Value To > &HFF and < &HFF00 So There's A Null:
IntArray(2).Int2 = 256

'Sort Again:
Array Sort IntArray(), From 3 To 4

'Now Look Where The 256 Is:
MsgBox "Element 1 =" & Str$(IntArray(1).Int2) & Chr$(13) & _
"Element 2 =" & Str$(IntArray(2).Int2) & Chr$(13) & _
"Element 3 =" & Str$(IntArray(3).Int2)
End Function
[\CODE]
I understand (at least I think I do) why this is happening, but
is there someway I can keep my UDTs and still sort correctly? If
not, I can bust em' up into three Integer arrays, but that'll be
somewhat of a pain. I looked at the Collate String and that's
a possibility, but I'm not sure I'd have all my bases covered.
Thanks In Advance, folks!!!



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[email protected]

[Semen Matusovski Member Find all posts View Profile Close Semen Matusovski]

Wyman --
Create index array

   #Compile Exe
   #Dim All
   #Register None
   #Include "Win32API.INC"
   Type TwoInts
      Int1 As Integer
      Int2 As Integer
   End Type
   Function PbMain
      Dim IntArray(1 To 5) As TwoInts, i As Integer
      'Init Array:
      IntArray(1).Int2 = 1423
      IntArray(2).Int2 = -1500
      IntArray(3).Int2 = 783
      IntArray(4).Int2 = 25200
      IntArray(5).Int2 = -17200
      'Sort
      ReDim Idx (LBound(IntArray()) To UBound(IntArray())) As Integer
      For i = LBound(IntArray()) To UBound(IntArray())
        idx(i) = IntArray(i).Int2
      Next
      Array Sort Idx(), TagArray IntArray()
      MsgBox "Element 1 =" & Str$(IntArray(1).Int2) & Chr$(13) & _
             "Element 2 =" & Str$(IntArray(2).Int2) & Chr$(13) & _
             "Element 3 =" & Str$(IntArray(3).Int2) & Chr$(13) & _
             "Element 4 =" & Str$(IntArray(4).Int2) & Chr$(13) & _
             "Element 5 =" & Str$(IntArray(5).Int2)
   End Function

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[Guest Close Wyman A Belts]

Hi Semen!
To make sure I understand, you're making a second Integer array
that's equal to the field I'm sorting on. Then you sort it with
the UDT array as a tagarray, right? That'll work. Thanks a lot
Semen!!!

------------------
[email protected]

[Michael Mattias Member Find all posts View Profile Close Michael Mattias]

Alternately, you can store numeric values in String Signed Binary format and sort them as characters.

There are some functions in the source code forum to do this; search on "SSB" or "String Signed Binary" and you'll find them.

MCM
(inventor of SSB)