用VB代码实现声音频谱

下面是使用 VB 代码实现声音频谱的示例：

' 导入必要的命名空间
Imports System.IO
Imports System.Media

Public Class Form1
    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        ' 选择文件并打开
        If OpenFileDialog1.ShowDialog() = DialogResult.OK Then
            Dim fileName As String = OpenFileDialog1.FileName
            Dim wave As New WaveFile(fileName)

            ' 获取频谱数据
            Dim spectrum As Single() = wave.GetSpectrumData()

            ' 处理频谱数据（此处省略）
            ' ...

            ' 绘制频谱图
            DrawSpectrum(spectrum)
        End If
    End Sub

    Private Sub DrawSpectrum(spectrum As Single())
        ' 创建绘图表面
        Dim bmp As New Bitmap(PictureBox1.Width, PictureBox1.Height)
        Dim g As Graphics = Graphics.FromImage(bmp)

        ' 绘制频谱图
        ' ...

        ' 将绘图表面显示到 PictureBox 中
        PictureBox1.Image = bmp
    End Sub
End Class

' 封装波形文件的类
Public Class WaveFile
    Private stream As FileStream
    Private reader As BinaryReader

    Public Sub New(fileName As String)
        stream = New FileStream(fileName, FileMode.Open)
        reader = New BinaryReader(stream)

        ' 跳过文件头
        stream.Seek(44, SeekOrigin.Begin)
    End Sub

    Public Function GetSpectrumData() As Single()
        Dim data As Single() = New Single(511) {}
        For i As Integer = 0 To 511
            data(i) = reader.ReadSingle()
        Next
        Return data
    End Function

    Public Sub Close()
        reader.Close()
        stream.Close()
    End Sub
End Class

在这个示例中，我们使用了 `WaveFile` 类来封装波形文件的读取，并使用 `GetSpectrumData` 方法来获取频谱数据。然后，我们使用 `DrawSpectrum` 方法将频谱数据绘制到绘图表面上，并将其显示在 `Picture