Option Explicit
Dim start, ends As Long
Dim JLH(1 To 300), LJD(1 To 300, 1 To 4), DST(1 To 300, 1 To 4) As Long
Dim BH(1 To 300), ADD(1 To 300) As String
Dim n As Integer
Dim vertexnum As Integer
Dim edgenum As Integer
Const max = 100000
Dim graph(0 To 300, 0 To 300) As Long
Dim visited(0 To 300) As Integer
Dim path(0 To 300) As Integer
Dim distance(0 To 90000) As Long

Private Function dijkstra(begin As Integer)
    Dim minedge, vertex, i, j, n, m, edges As Integer
    edges = 1
    visited(begin) = 1
    For i = 1 To vertexnum
        distance(i) = graph(begin, i)
'        Debug.Print distance(i)
    Next i
        distance(begin) = 0
              While (edges < vertexnum - 1)
                edges = edges + 1
                minedge = max
                For j = 1 To vertexnum
                    If visited(j) = 0 And minedge > distance(j) Then
                        vertex = j
                        minedge = distance(j)
                    End If
                Next j
                visited(vertex) = 1
                For n = 1 To vertexnum
                    If visited(n) = 0 And (distance(vertex) + graph(vertex, n)) < distance(n) Then
                        distance(n) = distance(vertex) + graph(vertex, n)
                        path(n) = vertex
                    End If
                Next
              Wend
End Function
Private Sub Command1_Click()
    Dim i, j As Integer
    Dim k As Integer
    Dim addname(1 To 100) As String
    
    Text1 = ""
        If start = 0 Or ends = 0 Then
        MsgBox "请选择起点与终点"
        Exit Sub
    End If
    For i = 1 To vertexnum
        visited(i) = 0
        path(i) = 1
    Next
    dijkstra (start)
    Text1 = "起讫：" & ADD(start) & "  -->  " & "终点：" & ADD(ends) & vbCrLf
    Text1 = Text1 & vbCrLf
    If distance(ends) = max Then
        Text1 = Text1 & "两点间没有可联接的路线！"
        Exit Sub
    Else
        Text1 = Text1 & "它们之间的距离为： " & distance(ends) * 0.1 & "  Km" & vbCrLf
        Text1 = Text1 & vbCrLf
        Text1 = Text1 & "它们之间的最短路线为：" & vbCrLf
        Text1 = Text1 & vbCrLf
        Text1 = Text1 & ADD(start)
    End If
    k = ends
    j = 1
    Do
        addname(j) = ADD(k)
        k = path(k)
        j = j + 1
    Loop While (k <> 1)
    For j = j - 1 To 1 Step -1
        Text1 = Text1 & "--> " & addname(j)
    Next j
End Sub

Private Sub Form_Initialize()
    Dim i, j, k As Long
    Dim filename As String
    Dim buffers As String
    
    On Error Resume Next
    
    filename = App.path + "\" + "Add_Dst" + ".txt"
    Open filename For Input As #1
    If LOF(1) = 0 Then
        MsgBox "The lenth of the file is zero! Please Select it asgain。" & vbCrLf & "The file name is Add_Dst。"
        
        Exit Sub
    End If
    i = 1
    Do While Not EOF(1)
    Line Input #1, buffers
        BH(i) = Val(Mid$(buffers, 1, 3))
        ADD(i) = Mid$(buffers, 4, 4)
            Combo1.AddItem ADD(i)
            Combo2.AddItem ADD(i)
        LJD(i, 1) = Val(Mid$(buffers, 8, 3))    '邻接点的编号
        DST(i, 1) = Val(Mid$(buffers, 11, 2))    '与邻接点之间的距离
        LJD(i, 2) = Val(Mid$(buffers, 13, 3))
        DST(i, 2) = Val(Mid$(buffers, 16, 2))
        LJD(i, 3) = Val(Mid$(buffers, 18, 3))
        DST(i, 3) = Val(Mid$(buffers, 21, 2))
        LJD(i, 4) = Val(Mid$(buffers, 24, 3))
        DST(i, 4) = Val(Mid$(buffers, 27, 2))
        Kill buffers
        i = i + 1
    Loop
        n = i - 1
'       Debug.Print n
    Close #1
       
    vertexnum = n  '设置图的顶点数
    
    edgenum = 0
   
    For i = 1 To n
        For j = 1 To 4
            If LJD(i, j) = 0 Then Exit For
            edgenum = edgenum + 1    '获得图的边数
            graph(i, LJD(i, j)) = DST(i, j)   '从i点与其邻接点LJD(i,j)的距离
        Next
    Next

    For i = 0 To n
        For j = 0 To n
            If graph(i, j) = 0 Then
                graph(i, j) = max
            End If
        Next
    Next
End Sub
Private Sub Combo1_click()
    start = Combo1.ListIndex + 1      '获得起点的编号
End Sub

Private Sub Combo2_click()
    ends = Combo2.ListIndex + 1      '获得终点的编号
End Sub

Private Sub Text1_Change()

End Sub

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