Grammar Constructor (SrgsDocument)
Constructs a new instance of Grammar from an instance of SrgsDocument.
Namespace: Microsoft.Speech.Recognition
Assembly: Microsoft.Speech (in microsoft.speech.dll)
Syntax
'Declaration
Parameters
- srgsDocument
An instance of SrgsDocument to a file containing a rules and a grammar to be used to construct the Grammar object.
Exceptions
| Exception type | Condition |
|---|---|
| ArgumentException | Generated for invalid values. Generated if the SrgsDocument specified by srgsDocument does not contain a root rule ruleName. |
Remarks
The srgsDocument argument
Must never be null.
Must contain the root rule
No parameters are supplied to this constructor, therefore the loaded rule should either have no initialization handler defined, or the initialization handler should require no arguments.
As there is no Base URI specified, any relative rule references must:
Have with absolute URIs.
Be contained within the grammar being loaded.
Using any paths defined in the grammar object being loaded. If the stream was created from a file, this typically includes the directory where that file was located.
Example
The following try/catch block attempts to create a new Grammar from an instance of SrgsDocument (srgsDoc).
The SrgsDocument instance must:
Contain a root rule
Have all references to other rules and grammars accessible in default locations.
Have no initialization handler, or a handler that takes not arguments.
XML defining SRGS content that would satisfy these conditions can be found following the source to this try/catch block.
try {
Grammar grammar = new Grammar(srgsDoc);
grammar.Enabled = true;
_recognizer.LoadGrammar(grammar);
} catch (System.ArgumentException exp) {
MessageBox.Show(String.Format("Invalid constructor arguments:\n{0}\n", exp.Message));
} catch (Exception exp) {
// Catch all other exceptions
MessageBox.Show(String.Format("Failed to load {0}.\nError Message:\n{1}",
filename, exp.Message));
}
A sample MapLookup.xml:
<grammar xml:lang="en-us" version="1.0"
xmlns="http://www.w3.org/2001/06/grammar" tag-format="properties-ms/1.0"
xmlns:sapi="http://schemas.microsoft.com/Speech/2002/06/SRGSExtensions"
sapi:debug="True" root="MapLookup">
<rule id="MapLookup" scope="public" sapi:onParse="OnParseMapLookup" sapi:onInit="OnInit" >
bis
</rule>
<sapi:script sapi:rule="MapLookup">
<![CDATA[
public object OnParseMapLookup(SemanticValue result, RecognizedWordUnit[] words) {
Console.WriteLine("OnParse MapLookup: " + _value);
return _value;
}
public SrgsRule[] OnInit(string state_region, string city, string country) {
Console.WriteLine(String.Format("Initializer using three arguments: {0},{1},{2}\n",
state_region, city, country));
_state_region = state_region;
_city = city;
_country = country;
return null;
}
public SrgsRule[] OnInit( string city, string state_region)
{
Console.WriteLine (String.Format("Initializer using two arguments: {0},{1}\n",
city,state_region));
_state_region = state_region;
_city=city;
_country="United States";
return null;
}
public SrgsRule[] OnInit(string country) {
Console.WriteLine(String.Format("Initializer using one argument: {0}\n",
country));
_state_region = null;
_city = null;
_country = country;
return null;
}
public SrgsRule[] OnInit() {
Console.WriteLine(String.Format("Initializer using no arguments\n"));
_state_region = null;
_city = null;
_country = "United States";
return null;
}
private string _state_region;
private string _city;
private string _state_region1;
private string _city1;
private string _value;
private string _country;
]]>
</sapi:script>
</grammar>
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
Grammar Class
Grammar Members
Microsoft.Speech.Recognition Namespace
Microsoft.Speech.Recognition.SrgsGrammar
SrgsDocument
SpeechRecognizer
SpeechRecognitionEngine
Grammar Constructor