來自xml文件的vb.net十六進制掃描

Question

我正在嘗試一些十六進制掃描儀源。

以下代碼有效，但速度很慢：

Public Class frmMain

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles LoadFile.Click

        Dim ArrayHold() As Byte
        Dim Index As Integer = 0
        Dim Str As New StringBuilder
        Dim tStr As String = ""
        Dim tempStr As String = ""
        Dim IndexEnd As Integer = 0
        Dim InputString As String = ""

        OpenDia.Filter = "All Files|*.*"

        If OpenDia.ShowDialog = Windows.Forms.DialogResult.OK Then
            Dim myStreamReader As StreamReader = Nothing
            myStreamReader = File.OpenText(OpenDia.FileName)
            InputString = myStreamReader.ReadToEnd()
            ArrayHold = Encoding.Default.GetBytes(InputString)

            Do
                IndexEnd = Index + 9

                For x As Integer = Index To IndexEnd

                    If x > UBound(ArrayHold) Then
                        tempStr = tempStr
                    Else
                        tStr = UCase(Convert.ToString(ArrayHold(x), 16))

                    If tStr.Length < 2 Then tStr = "0" & tStr

                    Str.Append(tStr)
                    tempStr = tempStr & Chr(ArrayHold(x))

                    End If
                Next

                Index = Index + 10
            Loop While IndexEnd < UBound(ArrayHold)

            If InStr(1, Str.ToString, "58354f2150254041505b345c505a58353428505e2937434329377d2445494341522d5354414e4441", vbTextCompare) Then
                Label1.Text = "Eicar-test-signature virus Detected!"
            End If
        End If
    End Sub
End Class

為了加快速度，我可以在XML文件中使用這種格式：

?xml version="1.0"?>
<signatures>
  <signature>
    <name>Eicar-Test-Signature</name>
      <hex>58354f2150254041505b345c505a58353428505e2937434329377d2445494341522d5354414e4441</hex>
  </signature>
  <signature>
    <name>Mid/Kakworm-Z</name>
      <hex>66732e4372656174655465787446696c652877642b276b616b2e72656727293b74322e77726974652827524547454449</hex>
  </signature>
</signatures>

但我不知道如何在VB.NET中閱讀和實現XML文件。 這很難，任何人都可以幫忙嗎？

Answer 1

好的，這是一個如何讀取XML文件的示例：

Dim xml = <?xml version="1.0"?>
          <signatures>
            <signature>
              <name>Eicar-Test-Signature</name>
              <hex>58354f2150254041505b345c505a58353428505e2937434329377d2445494341522d5354414e4441</hex>
            </signature>
            <signature>
              <name>Mid/Kakworm-Z</name>
              <hex>66732e4372656174655465787446696c652877642b276b616b2e72656727293b74322e77726974652827524547454449</hex>
            </signature>
          </signatures>

Dim dict As New Dictionary(Of String, String)
For Each signature As XElement In xml.Root.Elements
  dict.Add(signature.<name>.Value, signature.<hex>.Value)
Next

您可能正在使用XDocument.Load或XDocument.Parse ，而不是在代碼中嵌入XML（如上例所示）。

Answer 2

Neolisk很好地介紹了LINQ to XML部分。 這是一種使用Step簡化循環到單個For循環的方法。 此外，它在Using塊中使用StreamReader ，這將確保StreamReader被正確關閉和處理。

If OpenDia.ShowDialog = Windows.Forms.DialogResult.OK Then

    Using myStreamReader As StreamReader = File.OpenText(openDia.FileName)

        ArrayHold = Encoding.Default.GetBytes(myStreamReader.ReadToEnd())
    End Using

    Dim arrayLength As Integer = ArrayHold.Length - 1

    For i As Integer = 0 To arrayLength Step 10
        Str.Append(UCase(Convert.ToString(ArrayHold(i), 16).PadLeft(2, "0"c)))
    Next

    If dict.ContainsKey(Str.ToString()) Then
        Label1.Text = dict(str.ToString())
    End If 
End If

這使用StringBuilder而沒有額外的字符串，並且應該稍微提升性能，雖然我打賭你最大的打擊是循環通過你一次構建一個字符的字符串，檢查每個字符。

編輯

添加了用於檢查字典的代碼（基於Neolisk將XML解析為字典的答案）以獲得完整性。