User supplied callback procedure for handling I/O operations.
    typedef GSErrCode  APIIO3DCommandProc (
        const API_IOParams*     ioParams,
        Modeler::SightPtr       sight
    );
    
Parameters
- ioParams
- [in] This structure contains the various parameters identifying the file to be opened or saved.
- sight
- [in] The 3D sight pointer.
Return Values
- NoError
- The function has completed with success.
For other common API errors see the API Errors document.
Remarks
This is the function which will be called when your add-on installed it with ACAPI_Install_FileTypeHandler3D.
Requirements
- Version: API 12.0 or later
- Header: APIdefs_Callback.h