Wolfi30
Anmeldungsdatum: 17.08.2007
Beiträge: 38
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 Verfasst am: 25.11.2007, 15:19 Titel: Kleine OOP-Liste |
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Hallo,
hab hier mal der Übung wegen eine kleine Liste in Freebasic-OOP aufgebaut!
Mir ist dabei aufgefallen, das eine deklarierte Variable in einer FOR-Schleife in einer property-Anweisung nicht erkannt wird! Compiler zeigt mir "Variable not declared" an. Hab dann mit der while-wend variante gearbeitet und es ging dann!
Deklariere ich die Variable direkt in der property-Anweisung erkennt die For-Schleife die Variable an!
Hier mal der Code mit einem Beispiel
| Code: | Type TListValue
pValue As UByte
pRev As TListValue Ptr
pNext As TListValue Ptr
End Type
Type TList
Declare Constructor()
Declare Destructor()
Declare Property GetStartAdr() As TListValue Ptr
Declare Property Value() As UByte
Declare Property Value(ByVal wert As UByte)
Declare Property ListCount() As UInteger
Declare Property DelListPos(ByVal position As UInteger)
Declare Property InsertPos(ByVal position As UInteger)
Declare Property GotoListPos(ByVal position As UInteger)
Declare Sub Start()
Declare Sub NewList()
Declare Sub NextValue()
Declare Sub PrevValue()
Private:
i As UInteger
count As uInteger
pStart As TListValue Ptr
pIst As TListValue ptr
pMerke As TListValue Ptr
pMerkeNext As TListValue Ptr
pDel As TListValue Ptr
End Type
Constructor TList()
pStart=allocate(SizeOf(TListValue))
pStart->pRev=0
pIst=pStart
count+=1
End Constructor
Destructor TList()
pMerke=pStart
While pMerke->pNext <> 0
pMerkeNext=pMerke->pNext
deallocate(pMerke)
pMerke=pMerkeNext
Wend
DeAllocate(pMerke)
count=0
End Destructor
Property TList.GetStartAdr() As TListValue Ptr
Property=pStart
End Property
Property TList.Value() As UByte
Property=pIst->pValue
End Property
Property TList.Value(ByVal wert As UByte)
pIst->pValue=wert
End Property
Property TList.ListCount() As UInteger
Property=count
End Property
Property TList.DelListPos(ByVal position As UInteger)
pMerke=pStart
If position = 1 Then
pDel=pMerke
pMerke=pMerke->pNext
pMerke->pRev=0
pStart=pMerke
DeAllocate(pDel)
count-=1
ElseIf position = count Then
While pMerke->pNext <> 0
pMerke=pMerke->pNext
Wend
pDel=pMerke
pMerke=pMerke->pRev
pMerke->pNext=0
DeAllocate(pDel)
count-=1
ElseIf position > count Then
Print "Error position > ListCount"
Else
i=1
While i <= position-1
pMerke=pMerke->pNext
i+=1
Wend
pDel=pMerke
pMerke=pDel->pRev
pMerkeNext=pDel->pNext
pMerke->pNext=pMerkeNext
pMerkeNext->pRev=pMerke
DeAllocate(pDel)
count-=1
EndIf
End Property
Property TList.InsertPos(ByVal position As UInteger)
pMerke=Allocate(SizeOf(TListValue))
If position=1 Then
pMerke->pRev=0
pMerke->pNext=pStart
pStart->pRev=pMerke
pStart=pMerke
Start()
count+=1
Else
pIst=pMerke
pMerke=pStart
i=1
While i <= position-2
pMerke=pMerke->pNext
i+=1
Wend
pMerkeNext=pMerke->pNext
pMerke->pNext=pIst
pMerkeNext->pRev=pIst
pIst->pRev=pMerke
pIst->pNext=pMerkeNext
count+=1
EndIf
End Property
Property TList.GotoListPos(ByVal position As UInteger)
Start()
i=1
While i <= position-1
pIst=pIst->pNext
i+=1
Wend
End Property
Sub TList.Start()
pIst=pStart
End Sub
Sub TList.NewList()
pIst->pNext=Allocate(SizeOf(TListValue))
pMerke=pIst
pIst=pIst->pNext
pIst->pRev=pMerke
pIst->pNext=0
count+=1
End Sub
Sub TList.NextValue()
If pIst->pNext <> 0 Then
pIst=pIst->pNext
EndIf
End Sub
Sub TList.PrevValue()
If pIst->pRev <> 0 Then
pIst=pIst->pRev
EndIf
End Sub
Dim Liste As TList
Dim i As UInteger
Liste.Value=10
For i=2 To 10
Liste.NewList
Liste.Value=i*10
Next
Liste.Start
For i=1 To Liste.ListCount
? Liste.Value
Liste.NextValue
Next
Sleep
?
Liste.InsertPos=3
Liste.Value=25
Liste.Start
For i=1 To Liste.ListCount
? Liste.Value
Liste.NextValue
Next
Sleep
?
Liste.DelListPos=3
Liste.Start
For i=1 To Liste.ListCount
? Liste.Value
Liste.NextValue
Next
Sleep |
Gruß Wolfi |
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