DisplayAttributes Enumeration

DisplayAttributes Enumeration

 

Lists the options that the SpeechRecognitionEngine object can use to specify white space for the display of a word or punctuation mark.

This enumeration has a FlagsAttribute attribute that allows a bitwise combination of its member values.

Namespace:   System.Speech.Recognition
Assembly:  System.Speech (in System.Speech.dll)

[FlagsAttribute]
public enum DisplayAttributes

Member nameDescription
ConsumeLeadingSpaces

The item has no spaces preceding it.

None

The item does not specify how white space is handled.

OneTrailingSpace

The item has one space following it.

TwoTrailingSpaces

The item has two spaces following it.

ZeroTrailingSpaces

The item has no spaces following it.

Windows Desktop Speech returns recognized phrases as collections of RecognizedWordUnit or ReplacementText objects. Each object corresponds to a single word or punctuation mark. The DisplayAttributes property of a RecognizedWordUnit or ReplacementText uses a member of the DisplayAttributes enumeration to describe how print spacing is handled around a given word or punctuation mark.

Two or more members of the DisplayAttributes enumeration may be combined by a bit-wise OR to specify how a particular word should be displayed.

System_CAPS_noteNote

The display formatting that the speech recognizer uses is language specific.

For example, suppose the input phrase to a recognition engine using the default system grammar provided by DictationGrammar is "Hello comma he said period". Then the recognition engine returns a RecognizedPhrase containing five RecognizedWordUnit objects containing the following strings with the following DisplayAttributes values.

Item

DisplayAttributes

Hello

OneTrailingSpace

,

OneTrailingSpace | ConsumeLeadingSpaces

he

OneTrailingSpace

said

OneTrailingSpace

.

OneTrailingSpace | ConsumeLeadingSpaces

The text returned for this recognized phrase is printed as: "Hello, he said."

The following example uses the DisplayAttributes property of a list of RecognizedWordUnit objects to format the words as a phrase.


// Use the DisplayAttributes property to format speech as text. 

static string GetDisplayText(List<RecognizedWordUnit> words)
{
  StringBuilder sb = new StringBuilder();

  // Concatenate the word units together. Use the DisplayAttributes
  // property of each word unit to add or remove white space around
  // the word unit.
  foreach (RecognizedWordUnit word in words)
  {
    if ((word.DisplayAttributes
      & DisplayAttributes.ConsumeLeadingSpaces) != 0))
    {
      sb = new StringBuilder(sb.ToString().TrimEnd());
    }

    sb.Append(word.Text);

    if ((word.DisplayAttributes
      & DisplayAttributes.OneTrailingSpace) != 0)
    {
      sb.Append(" ");
    }
    else if ((word.DisplayAttributes
      & DisplayAttributes.TwoTrailingSpaces) != 0)
    {
      sb.Append("  ");
    }
  }

  return sb.ToString();
}

.NET Framework
Available since 3.0
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