SemanticValue.Count Property

Returns the number of child SemanticValue objects under the current SemanticValue instance.

Namespace: Microsoft.Speech.Recognition
Assembly: Microsoft.Speech (in microsoft.speech.dll)

Syntax

'Declaration

Property Value

Returns an int containing the number of child SemanticValue objects the current SemanticValue has.

Remarks

Recognition results which do not make use of semantic parsing always have a Count property of zero, as well as a Value of null.

Example

The example below shows a handler for a SpeechRecognized event designed to handle commands to change foreground and background color.

Cases where phrases are recognized, but have no semantic structure, are identified by the handler by having Count of zero and a Value of null (see highlights below). This recognition output is then processed directly from the parsing the raw text.

In other cases, the handler obtains specific information about whether the command is to set the foreground or background color, and the RGB of official name of a color setting based on keys, or indicates that no valid key was found.

newGrammar.SpeechRecognized +=
    delegate(object sender, SpeechRecognizedEventArgs eventArgs) {
        // Retrieve the value of the semantic property.
        bool changeBackGround = true;
        string errorString = "";
        SemanticValue semantics = eventArgs.Result.Semantics;

        Color newColor = Color.Empty;
        

        try {
            if (semantics.Count == 0 && semantics.Value==null){
                
                //This signature of recognition by grammar with no semantic
                ////We have to parse the string. hope last word is color, search for background or forground in input
                if (eventArgs.Result.Text.Contains("foreground")) {
                    changeBackGround = false;
                }
                string cName = eventArgs.Result.Words[eventArgs.Result.Words.Count - 1].Text;
                newColor = Color.FromName(cName);
            
            }else if (semantics.ContainsKey("colorStringList") ^ semantics.ContainsKey("colorRGBValueList")) {
                //Check background vs foreground

                if (semantics.ContainsKey("applyChgToBackground")) {
                    changeBackGround = semantics["applyChgToBackground"].Value is bool;
                }

                //Get color value
                if (semantics.ContainsKey("colorStringList")) {
                    newColor = Color.FromName((string)semantics["colorStringList"].Value);
                }
                if (semantics.ContainsKey("colorRGBValueList")) {
                    newColor = System.Drawing.Color.FromArgb((int)semantics["colorRGBValueList"].Value);
                }
            } else {
                //we have a semantics that does not contain the keys we support, throw an exception.
                throw(new Exception("Unsupported semantics keys found."));
            }

        } catch (Exception exp) {
            MessageBox.Show(String.Format("Unable to process color semantics.:\n{0}\n", exp.Message));
            return;
        }
        //Change colors, either foreground or background.
        if (changeBackGround) {
            BackColor = newColor;
            float Bright = BackColor.GetBrightness();
            float Hue = BackColor.GetHue();
            float Sat = BackColor.GetSaturation();
            //Make sure the text is readable regardless of background.
            if (BackColor.GetBrightness() <= .50) {
                ForeColor = Color.White;
            } else {
                ForeColor = Color.Black;
            }
        } else {
            ForeColor = newColor;
            float Bright = ForeColor.GetBrightness();
            float Hue = ForeColor.GetHue();
            float Sat = ForeColor.GetSaturation();
            //Make sure the text is readable regardless of Foreground.
            if (ForeColor.GetBrightness() <= .50) {
                BackColor = Color.White;
            } else {
                BackColor = Color.Black;
            }
        }
        Return;

};

Thread Safety

All public static (Shared in Visual Basic) members of this type are thread-safe. Instance members are not guaranteed to be thread-safe.

Platforms

Development Platforms

Windows XP Professional with Service Pack 2 (SP2), Windows Server 2003, Windows Vista Ultimate Edition, Windows Vista Business Edition, Windows Vista Enterprise Edition

Target Platforms

See Also

Reference

SemanticValue Class
SemanticValue Members
Microsoft.Speech.Recognition Namespace