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Microsoft Speech SDK

Object: SpVoice (Events)

Word Event

The Word event occurs when the text-to-speech (TTS) engine detects a word boundary while speaking a stream for the SpVoice object.

SpVoice.Word(
     StreamNumber As Long,
     StreamPosition As Variant,
     CharacterPosition As Long,
     Length As Long
)

Parameters

StreamNumber

The stream number which generated the event. When a voice enqueues more than one stream by speaking asynchronously, the stream number is necessary to associate an event with the appropriate stream.

StreamPosition

The character position in the output stream at which the word begins.

CharacterPosition

The character position in the input stream one character before the start of the word. In the case of the first word in a stream, this parameter is zero.

Length

The length of the word in the input stream.

Example

The following Visual Basic form code demonstrates the use of the Word event. To run this code, create a form with the following controls:

Paste this code into the Declarations section of the form.

The Form_Load procedure puts a text string in Text1 and creates a voice object. The command1_Click procedure calls the Speak method. This will cause the TTS engine to send the Word event to the voice; the Word event code will use the event parameters to highlight the word associated with the event.

Option Explicit

Public WithEvents vox As SpeechLib.SpVoice

Private Sub Command1_Click()

    vox.Speak Text1.Text, SVSFlagsAsync
    
End Sub

Private Sub Form_Load()

    Set vox = New SpVoice
    Text1.Text = "This is some text in a textbox."

End Sub

Private Sub vox_Word(ByVal StreamNumber As Long, ByVal StreamPosition As Variant, _
                     ByVal CharacterPosition As Long, ByVal Length As Long)

    ' In order to show this selection, 
    ' the Text1.HideSelection property must be False!

    Text1.SelStart = CharacterPosition
    Text1.SelLength = Length

End Sub