A wx:meta-file-dc% object is a type of device context that allows a metafile object to be created, and has most of the characteristics of a normal wx:dc%. The close ,ethod must be called after drawing into the device context to return a wx:meta-file% object.
Note that a metafile saved to disk is in standard Windows metafile format, and cannot be imported into most applications. To make it importable, call the function wx:make-meta-file-placeable after closing a disk-based metafile device context.
If filename is null, the metafile is created in memory.