IDWriteFactory.RegisterFontFileLoader

<summary> Registers a font file loader with DirectWrite. </summary> <param name="fontFileLoader">Pointer to the implementation of the IDWriteFontFileLoader for a particular file resource type.</param> <returns> Standard HRESULT error code. </returns> <remarks> This function registers a font file loader with DirectWrite. Font file loader interface handles loading font file resources of a particular type from a key. The font file loader interface is recommended to be implemented by a singleton object. A given instance can only be registered once. Succeeding attempts will return an error that it has already been registered. IMPORTANT: font file loader implementations must not register themselves with DirectWrite inside their constructors and must not unregister themselves in their destructors, because registration and unregistration operations increment and decrement the object reference count respectively. Instead, registration and unregistration of font file loaders with DirectWrite should be performed outside of the font file loader implementation as a separate step. </remarks>