This article provides spell checking functionality for Windows Store Apps, which is missing out-of-box for C#-VB/XAML, HTML/JavaScript apps.  

This was implemented in response to MSDN forum questions where developers are often looking for spell check solutions in C# or JavaScripts apps. Writing a wrapper over the spell checker factory is easy. However, it could be a little tricky for C# developers. Also, in some way, it completes this Code Sample Request.

http://gallery.technet.microsoft.com/Spell-Checking-WinRT-cb59a4d5

Introduction

It also shows how to ...

1. Use WinRT Component

2. Create WinRT Component Wrapper over Win32 libraries

3. Use C++/CX class as a wrapper to expose Win32 apis

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Description

It implements the component wrapper over Win32 SpellChecker library. A wrapper that it can be easily used by caller of Windows Store App irrespective of Application Language and without worrying about C++ and COM intricacies.

Spell checking client sample (C++)

Also it needs to have spell checker provider installed. See below link for more details

Spell checking provider sample

Internals

The functionality to check spellings is exposed by ISpellCheckerFactory and ISpellChecker interface.

ISpellCheckerFactory : public IUnknown
    {
    public:
        virtual /* [propget] */ HRESULT STDMETHODCALLTYPE get_SupportedLanguages( 
            /* [retval][out] */ __RPC__deref_out_opt IEnumString **value) = 0;
        
        virtual HRESULT STDMETHODCALLTYPE IsSupported( 
            /* [in] */ __RPC__in LPCWSTR languageTag,
            /* [retval][out] */ __RPC__out BOOL *value) = 0;
        
        virtual HRESULT STDMETHODCALLTYPE CreateSpellChecker( 
            /* [in] */ __RPC__in LPCWSTR languageTag,
            /* [retval][out] */ __RPC__deref_out_opt ISpellChecker **value) = 0;
        
    };

To start using the functionality, we initialize the COM infrastructure and create a instance of ISpellCheckerFactory as shown below inside Win RT Component. 

  HRESULT hr = CoCreateInstance(__uuidof(SpellCheckerFactory), nullptr, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(spellCheckerFactory));
    if (FAILED(hr))
    {
		//"Unable to create Spell Checker Factory"
    }

ISpellChecker* spellChecker = nullptr;  
hr = spellCheckerFactory->CreateSpellChecker(languageTag, &spellChecker);
            if (SUCCEEDED(hr))
            {
		// Spell checker interface created
	}

IEnumSpellingError* enumSpellingError = nullptr;
				HRESULT hr = ReadText(buffer, ARRAYSIZE(text), text); // See project for more details of this function
				if (SUCCEEDED(hr))
				{
					hr = spellChecker->Check(text, &enumSpellingError);
				}

Consuming WinRT Spell Checker Component in Window Store App

1. Copy SpellCheckerWrapperComponent project to your solution

2. Add SpellCheckerWrapperComponent as Project Reference to the Project you would like to use the Spell Checker functions.

3. Use SpellChecker class inside namespace SpellCheckerWinRTComponent present in test project SpellChecker or simplly call the functions inside the WinRT component.

To get all available supported languages.

 SpellCheckerWrapperComponent.SpellChecker spellChecker = new SpellCheckerWrapperComponent.SpellChecker(); 
            IList<string> lstAllAvailablleLangs = spellChecker.GetSupportedLanguages();

 Dim spellChecker As SpellCheckerWrapperComponent.SpellChecker = New SpellCheckerWrapperComponent.SpellChecker() 
        Dim lstAvailablleLangs As IList(Of String) = spellChecker.GetSupportedLanguages() 
        

SpellCheckerWrapperComponent.SpellChecker spellChecker = new SpellCheckerWrapperComponent.SpellChecker(); 
SpellCheckerWrapperComponent.SpellingCheckResults spellingCheckResults = spellChecker.CheckWordSpelling(word, languageTag/*"en-US"*/);

Dim spellChecker As SpellCheckerWrapperComponent.SpellChecker = new SpellCheckerWrapperComponent.SpellChecker(); 
        Dim language As String = "en-US" 
        Dim word As String = "testin" 
        Dim spellingCheckResults As SpellCheckerWrapperComponent.SpellingCheckResults = spellChecker.CheckWordSpelling(word, language) 
        Dim isSpellingCorrect As String = spellingCheckResults.IsCorrect 
        Dim lstSuggestions As IList(Of String) = spellingCheckResults.Suggestions 
        Dim replacementIfAny As String = spellingCheckResults.ReplacementIfAny

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The Project

http://gallery.technet.microsoft.com/Spell-Checking-WinRT-cb59a4d5

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