The application passes a parameter list with the same meaning as defined for MouSetPtrShape to the mouse device driver. The mouse device driver copies the parameters that describe the pointer shape and attributes into the pointer definition control block pointed to by the PtrDefRec parameter. The cb field must contain the size in bytes of the application buffer where the device driver is to insert the sessions pointer image. All other fields are returned to the application by MouGetPtrShape.

If the buffer size is insufficient, the cb field contains the actual size in bytes of the returned pointer image.

The pointer shape may be set by the application with MouSetPtrShape or may be the default image provided by the installed Pointer Device Driver.