Question

我想制作一个类似Missing Bracket Finder的程序，但是我想让它告诉我哪个行缺少{或}，我完全是新手，对不起我的英语不好。

这是我的代码：

Public Class Form1

    Private Sub OpenFileDialog1_FileOk(ByVal sender As System.Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles OpenFileDialog1.FileOk
        TextBox1.Text = OpenFileDialog1.FileName
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        OpenFileDialog1.ShowDialog()
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        If System.IO.File.Exists(OpenFileDialog1.FileName) Then
            MsgBox("Number '{':" & System.IO.File.ReadAllText(OpenFileDialog1.FileName).Count(Function(x) x = "{") & "    " & "Number '}':" & System.IO.File.ReadAllText(OpenFileDialog1.FileName).Count(Function(x) x = "}"), MsgBoxStyle.OkOnly, "Info")
        Else
            MsgBox(TextBox1.Text & vbNewLine & "File not found." & vbNewLine & "Please verify the correct file name was given.", MsgBoxStyle.Exclamation, "Open")
        End If
    End Sub

End Class

Answer 1

对于您要解决的编程问题，我认为最好逐行读取文件。对于您阅读的每一行，您只需搜索“ {”和“}”的索引。如果搜索索引不会产生（-1），则说明您缺少“ {”或“}”。您可以查看下面的示例代码。我没有编写任何错误检查条件，因此您必须自己实现。

Module VBModule
    Sub Main()
        Dim fileName As String = "test.txt"
        Dim fileReader As System.IO.StreamReader
        Dim lineNumber As Integer = 0
        Dim lineContent As String
        fileReader = My.Computer.FileSystem.OpenTextFileReader(fileName)

        while fileReader.Peek() <> -1
            lineNumber = lineNumber + 1 ' <-- Move this to the bottom to start at line 0.
                                        '     Otherwise, it currently start at line 1.
            lineContent = fileReader.readLine()
            if ( lineContent.indexOf("{") = -1 ) then
                Console.WriteLine("Line " + lineNumber.toString() + " missing { ")
            end if
            if ( lineContent.indexOf("}") = -1 ) then
                Console.WriteLine("Line " + lineNumber.toString() + " missing } " )
            end if
        end while
    End Sub
End Module

以下是test.txt文件的内容：

abc {}
buffer{
c}
d

Answer 2

是的，这是一个简单的技巧，很普遍，并在这些程序和调试器中普遍使用。您只需为每种类型的括号设置一个计数器，当其为“ {”时加1，然后在相反的方向上减一。您不会得到的线，但是一旦您得出负值，近似解就可以使用，您应该始终最终得到0，并且永远不会有负值。如果仍然要行，则仅留空白。计算空的空间并计算出大括号，但不建议这样做。

如何查找缺少哪一行“ {”“}”

2 个答案: