Erreur : valeur de retour en fin de fonction

**l1xnoir** · 19/04/2007, 12h34

Bonjour,

Je suis en train de faire migrer un projet de VB6 a VB.NET, jusque là pas de problème, la fonction (de cryptage) reste fonctionnelle, sauf en fin de séquence, ou lorsque je lance l'execution, une erreur m'était signalée :
La fonction ne retourne pas une valeur pour tout les chemins de code. Une exception de référence null peu se produire au moment de l'execution lorsque le résultat est utilisé.

Pour résoudre ce problème, j'ai donc ajouté un Return, mais lors de l'execution, le programme affichait une valeur de retour "False"...

Que faire? J'ai peut être oublié un élément basique lors du renvoi de valeur...

Code Source correspondant :

Code :

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    Private Sub button_crypter_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles button_crypter.Click
        Dim phraseacoder As String
        Dim phrasecode As String
 
        phraseacoder = TextBox1.Text
        phraseacoder = Crypte_atozrev(phraseacoder)
        phrasecode = phraseacoder
        TextBox2.Text = phrasecode
    End Sub
 
    Public Function Crypte_atozrev(ByVal phraseacoder As String)
 
        Dim i As Long                                                'définition de l'indice du caractère
        Dim caractere As String                                 'définition de la variable contenant le caractère initial
        Dim caracterecode As String                           'définition de la variable contenant le caractère final
        Dim longueur As Integer                                 'définition de la variable qui contiendra la valeur du nombre de caractère dans la chaine a coder
        Dim phrasecoderev As String
 
        i = 1                                                               'affectation de la valeur -1 a i
        longueur = phraseacoder.Length                         'affectation de la valeur de longueur de la chaine à la variable longueur
 
        For i = 1 To longueur                                       'debut de la boucle allant de i = 1 à i = longueur
 
            caractere = Mid(phraseacoder, i, 1)         'affectation de la valeur du premier caractère de la chaine à la variable caractère
 
            caracterecode = Replace(caractere, " ", "'")
            Mid(phraseacoder, i, 1) = caracterecode
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "'", " ")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "a", "z")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "b", "y")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "c", "x")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "d", "w")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "e", "v")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "f", "u")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "g", "t")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "h", "s")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "i", "r")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "j", "q")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "k", "p")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "l", "o")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "m", "n")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "n", "m")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "o", "l")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "p", "k")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "q", "j")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "r", "i")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "s", "h")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "t", "g")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "u", "f")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "v", "e")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "w", "d")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "x", "c")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "y", "b")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "z", "a")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "A", "Z")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "B", "Y")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "C", "X")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "D", "W")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "E", "V")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "F", "U")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "G", "T")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "H", "S")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "I", "R")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "J", "Q")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "K", "P")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "L", "O")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "M", "N")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "N", "M")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "O", "L")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "P", "K")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "Q", "J")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "R", "I")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "S", "H")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "T", "G")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "U", "F")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "V", "E")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "W", "D")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "X", "C")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "Y", "B")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "Z", "A")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "0", "9")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "1", "8")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "2", "7")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "3", "6")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "4", "5")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "5", "4")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "6", "3")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "7", "2")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "8", "1")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "9", "0")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, ".", "~")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
            If caracterecode = caractere Then
                caracterecode = Replace(caractere, "~", ".")
                Mid(phraseacoder, i, 1) = caracterecode
            Else
                GoTo change_caractere
            End If
 
 
change_caractere:
        Next i
 
        phrasecoderev = StrReverse(phraseacoder)
        Return phraseacoder = phrasecoderev
 
    End Function
 
End Class

Si une âme charitable pouvait m'aider à résoudre mon problème je lui en serais très reconnaissant,
merci d'avance.

**Kelpan** · 19/04/2007, 14h35

Code vb.net :

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Return phraseacoder = phrasecoderev

Retourne vrai si phrasecode = phrasecodrev, sinon retourne faux ...
Donc logique qu'il te retourne un boolean

Ceci est plus juste :

Code vb.net :

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Return phrasecoderev

Code vb.net :

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Public Function Crypte_atozrev(ByVal phraseacoder As String) As String

De plus il serait plus judicieux de mettre le type de retour (Par défaut c'est 'Object'), cela permet d'identifier ce genre d'erreur à la compilation.

Sinon en passant, ceci n'est-il pas plus simple :

Code vb.net :

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Private Sub button_crypter_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles button_crypter.Click
 
        TextBox2.Text = Crypte_atozrev(TextBox1.Text)
    End Sub

**Kelpan** · 19/04/2007, 15h00

Par ailleurs si ceci peut t'aider à simplifier un "chouillat" ton code ...
Juste pour montrer qu'en cherchant un peu, on peu largement simplifier le code, la maintenance, etc ...

Code vb.net :

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Private Function Crypte_atozrev(ByVal Str_ChaineACoder As String) As String
    Dim Str_Code1 As String = " 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789.~"
    Dim Str_Code2 As String = "' zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA9876543210~."
    Dim Int_Index As Integer
    Dim Str_ChaineCodee As String
 
    For Int_Index = 0 To Str_ChaineACoder.Length - 1
        Str_ChaineCodee &= Str_Code2.Chars(Str_Code1.IndexOf(Str_ChaineACoder.Chars(Int_Index)))
    Next
 
    Return StrReverse(Str_ChaineCodee)
End Function

**l1xnoir** · 19/04/2007, 16h32

Merci encore pour ton aide, problème résolut, à la prochaine

Erreur : valeur de retour en fin de fonction

Windows Forms

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