question

Hi FayWang, thanks for th reply. I tried out the API but the API DWriteCreateFactory() fails for the IDWriteTextAnalysisSink interface. The HRESULT error is "Not an interface". Below is the code I have used. Could you please check and point out where I have possibly gone wrong?

 IDWriteNumberSubstitution* sub;
 IDWriteFactory* fact;
 HRESULT hr = DWriteCreateFactory(DWRITE_FACTORY_TYPE_SHARED, __uuidof(IDWriteFactory), reinterpret_cast<IUnknown**>(&fact));
 if (SUCCEEDED(hr))
 {
        
     hr = fact->CreateNumberSubstitution(DWRITE_NUMBER_SUBSTITUTION_METHOD_CONTEXTUAL, strLocale.c_str(), TRUE, &sub); //  strLocale contains say "en-us" for eg:
     if (SUCCEEDED(hr))
     {
            
         IDWriteTextAnalysisSink* sink;
         hr = DWriteCreateFactory(DWRITE_FACTORY_TYPE_SHARED,__uuidof(IDWriteTextAnalysisSink), reinterpret_cast<IUnknown**>(&sink)); // Fails
         if (SUCCEEDED(hr))
         {
                
             hr = sink->SetNumberSubstitution(0, m_myStringVal.GetLength(), sub); // m_myStringVal is CString
             if (SUCCEEDED(hr))
             {
                    
             }
         }
     }
 }

Hello,​

Welcome to our Microsoft Q&A platform!

The only workarounds that may help achieve your end goal to listen for text input and manually change numbers typed in Arabic to English. This means you can implement a TextChanging event handler and transform the national digits produced by the Arabic keyboard to Latin digits. You can try the following method to detect Arabic numerals to convert them to English.

 private string toEnglishNumber(string input)
 {
     string EnglishNumbers = "";
    
     for (int i = 0; i < input.Length; i++)
     {
         if (Char.IsDigit(input[i]))
         {
             EnglishNumbers += char.GetNumericValue(input, i);
         }
         else
         {
             EnglishNumbers += input[i].ToString();
         }
     }
     return EnglishNumbers;
 }