Visual Basic .Net语音命令

问题描述：

我正在制作一个具有语音命令的简单程序。我不完全知道vb.net中的代码，所以我试图复制C＃中的代码，然后把它放在VB中，当我运行它时，它说“空规则是不允许的”Visual Basic .Net语音命令

这是我的代码：

Private Sub loginCommandFom_Load(sender As Object, e As EventArgs) Handles MyBase.Load 
    Try 
     Dim commandChoices As New Recognition.Choices 
     Dim grammarBuilder As New Recognition.GrammarBuilder 
     Dim gr As New Recognition.Grammar(grammarBuilder) 
     commandChoices.Add(New String("Hey", "Wazzup")) 
     grammarBuilder.Append(commandChoices) 
     commandRecognition.LoadGrammarAsync(gr) 
     commandRecognition.SetInputToDefaultAudioDevice() 
     commandRecognition.RecognizeAsync() 
    Catch ex As Exception 
     MessageBox.Show(ex.Message, "Error!", MessageBoxButtons.OK, MessageBoxIcon.Information) 
    End Try 
End Sub 
Private Sub speechCompleted(sender As Object, e As System.Speech.Recognition.RecognizeCompletedEventArgs) Handles commandRecognition.RecognizeCompleted 
    commandRecognition.RecognizeAsync() 
End Sub 
Private Sub speechRecognize(sender As Object, e As System.Speech.Recognition.SpeechRecognizedEventArgs) Handles commandRecognition.SpeechRecognized 
    Select Case e.Result.Text 
     Case "Hey" 
      MsgBox("Yeah") 
     Case "Wazzup" 
      MsgBox("Yah") 
    End Select 
End Sub

答

有你犯的一个小错误是你正在尝试将null grammarbuilder添加到gramar中。

空规则是不允许的 - 在这里规则意味着语法，当您使用语法classGrammar（grammarBuilder）的构造

化妆以下更改为它分配它在当时是空的。

Private Sub loginCommandFom_Load(sender As Object, e As EventArgs) Handles MyBase.Load 
Try 
    Dim commandChoices As New Recognition.Choices 
    Dim grammarBuilder As New Recognition.GrammarBuilder 
    'removed 
    commandChoices.Add(New String("Hey", "Wazzup")) 
    grammarBuilder.Append(commandChoices) 
    'added 
    Dim gr As New Recognition.Grammar(grammarBuilder) 
    commandRecognition.LoadGrammarAsync(gr) 
    commandRecognition.SetInputToDefaultAudioDevice() 
    commandRecognition.RecognizeAsync() 
Catch ex As Exception 
    MessageBox.Show(ex.Message, "Error!", MessageBoxButtons.OK, MessageBoxIcon.Information) 
End Try 
End Sub 
Private Sub speechCompleted(sender As Object, e As System.Speech.Recognition.RecognizeCompletedEventArgs) Handles commandRecognition.RecognizeCompleted 
commandRecognition.RecognizeAsync() 
End Sub 
Private Sub speechRecognize(sender As Object, e As System.Speech.Recognition.SpeechRecognizedEventArgs) Handles commandRecognition.SpeechRecognized 
Select Case e.Result.Text 
    Case "Hey" 
     MsgBox("Yeah") 
    Case "Wazzup" 
     MsgBox("Yah") 
End Select 
End Sub

Visual Basic .Net语音命令

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