VB Application Sample: Command and Control Recognition (SAPI 5.3)

Microsoft Speech API 5.3

VB Application Sample: Command and Control Recognition

The following code sample represents a simple, but functional, recognition application. It uses a command and control grammar which limits the recognizable text to those listed in the configuration file. In this case, the file is named sol.xml and the file contents are listed in the second code box below. The text is restricted to the single command "new game."

The commented lines in the Visual Basic code refer to hypothetical labels in a form to possibly display information. If a speech attempt does not match the new game rule pattern, it could also display "(no recognition)". Of course you may modify this application as needed to fit your own requirements.

Before running the application, a speech reference must be included. Using the Project->References menu, find and select the Microsoft Speech Object Library.

  
Public WithEvents RC As SpSharedRecoContext
Public myGrammar, b As ISpeechRecoGrammar

Private Sub Form_Load()
    On Error GoTo EH

    Set RC = New SpSharedRecoContext

    Set myGrammar = RC.CreateGrammar
    myGrammar.CmdLoadFromFile "sol.xml", SLODynamic
    myGrammar.CmdSetRuleIdState 0, SGDSActive

EH:
    If Err.Number Then ShowErrMsg
End Sub

Private Sub RC_FalseRecognition(ByVal StreamNumber As Long, ByVal StreamPosition As Variant, ByVal Result As SpeechLib.ISpeechRecoResult)
    'Label1.Caption = "(no recognition)"
End Sub

Private Sub RC_Recognition(ByVal StreamNumber As Long, ByVal StreamPosition As Variant, ByVal RecognitionType As SpeechLib.SpeechRecognitionType, ByVal Result As SpeechLib.ISpeechRecoResult)
    'Label1.Caption = Result.PhraseInfo.GetText
End Sub

Private Sub RC_StartStream(ByVal StreamNumber As Long, ByVal StreamPosition As Variant)
    'Label2.Caption = Val(StreamNumber)
End Sub

Private Sub ShowErrMsg()

    ' Declare identifiers:
    Const NL = vbNewLine
    Dim T As String

    T = "Desc: " & Err.Description & NL
    T = T & "Err #: " & Err.Number
    MsgBox T, vbExclamation, "Run-Time Error"
    End

End Sub

In addition to copying the code to the Visual Basic project, copy the following XML code into a new file named sol.xml.

  <GRAMMAR LANGID="409">
    <DEFINE>
	<ID NAME="RID_NewGame" VAL="101"/>
    </DEFINE>
	
   <RULE NAME="newgame" ID="RID_NewGame" TOPLEVEL="ACTIVE">
      <P>new +game</P>
   </RULE>
</GRAMMAR>

In cases when a second grammar file is needed, copy the following XML code into a new file named sol2.xml.

  <GRAMMAR LANGID="409">
    <DEFINE>
	<ID NAME="RID_FileGame" VAL="200"/>
    </DEFINE>
	
   <RULE NAME="filegame" ID="RID_FileGame" TOPLEVEL="ACTIVE">
      <P>file +game</P>
   </RULE>
</GRAMMAR>