<summary>
Gets the length in characters (not including the null terminator) of the string with the specified index.
</summary>
<param name="index">Zero-based index of the string.</param>
<param name="length">Receives the length in characters, not including the null terminator.</param>
<returns>
Standard HRESULT error code.
</returns>
<summary> Gets the length in characters (not including the null terminator) of the string with the specified index. </summary> <param name="index">Zero-based index of the string.</param> <param name="length">Receives the length in characters, not including the null terminator.</param> <returns> Standard HRESULT error code. </returns>