IDWriteTextAnalysisSource.GetNumberSubstitution

<summary> Get number substitution on the range affected by it. </summary> <param name="textPosition">Position to get the number substitution of.</param> <param name="textLength">Receives the length from the given position up to the next differing number substitution.</param> <param name="numberSubstitution">Address that receives a pointer to the number substitution at the specified position.</param> <remarks> Any implementation should return the number substitution with an incremented ref count, and the analysis will release when finished with it (either before the next call or before it returns). However, the sink callback may hold onto it after that. </remarks>