## FMAIExporter FMAIExporter — The Export Interface |

## Functions

#define | FMA_IEXPORTER()
#define | FMA_IS_IEXPORTER()
#define | FMA_IEXPORTER_GET_INTERFACE()

## Types and Values

#define | FMA_TYPE_IEXPORTER
| FMAIExporter
| FMAIExporterInterface
enum | FMAIExporterExportStatus
| FMAIExporterFormat
| FMAIExporterFormatv2
| FMAIExporterFileParms
| FMAIExporterFileParmsv2
| FMAIExporterBufferParms
| FMAIExporterBufferParmsv2

## Includes

    #include <filemanager-actions/fma-iexporter.h>

## Description

The FMAIExporter interface exports items to the outside world. Each implementation may provide one or more formats.

### Export format identifier

For its own internal needs, FileManager-Actions™ requires that each export format have its own identifier, as an ASCII string.

In order to avoid any collision, this export format identifier is allocated by the FileManager-Actions™ maintainers team. If you wish provide yourself a new export format, and so need a new export format identifier, please contact the maintainers (see filemanager-actions.doap at the root of the source tree).

Below is a list of currently allocated export format identifiers. This list has been last updated on 2015, September 10th.

Table 5. Currently allocated export format identifiers

Identifier | Name | Holder | Allocated on |  |
--- | --- | --- | --- | --- | ---
`Ask` | Reserved for FileManager-Actions™ internal needs | FileManager-Actions™ | 2010-02-15 |  | current
`Desktop1` | FMA Desktop module | FileManager-Actions™ | 2010-07-28 |  | current
`GConfSchemaV1` | FMA XML module | FileManager-Actions™ | 2010-02-15 | deprecated |
`GConfSchemaV2` | FMA XML module | FileManager-Actions™ | 2010-02-15 | deprecated |
`GConfEntry` | FMA XML module | FileManager-Actions™ | 2010-02-15 | deprecated |

### Versions historic

Table 6. Historic of the versions of the FMAIExporter interface

FileManager-Actions™ version | FMAIExporter interface version |  |
--- | --- | --- | ---
from 2.30 to 3.1.5 | 1 | deprecated |
since 3.2 | 2 |  | current version

## Functions

### FMA_IEXPORTER()

    #define FMA_IEXPORTER( instance )               ( G_TYPE_CHECK_INSTANCE_CAST( instance, FMA_TYPE_IEXPORTER, FMAIExporter ))

### FMA_IS_IEXPORTER()

    #define FMA_IS_IEXPORTER( instance )            ( G_TYPE_CHECK_INSTANCE_TYPE( instance, FMA_TYPE_IEXPORTER ))

### FMA_IEXPORTER_GET_INTERFACE()

    #define FMA_IEXPORTER_GET_INTERFACE( instance ) ( G_TYPE_INSTANCE_GET_INTERFACE(( instance ), FMA_TYPE_IEXPORTER, FMAIExporterInterface ))

## Types and Values

### FMA_TYPE_IEXPORTER

    #define FMA_TYPE_IEXPORTER                      ( fma_iexporter_get_type())

### FMAIExporter

    typedef struct _FMAIExporter FMAIExporter;

### FMAIExporterInterface

    typedef struct {
    	/**
    	 * get_version:
    	 * @instance: this FMAIExporter instance.
    	 *
    	 * FileManager-Actions calls this method each time it needs to know
    	 * which version of this interface the plugin implements.
    	 *
    	 * If this method is not implemented by the plugin,
    	 * FileManager-Actions considers that the plugin only implements
    	 * the version 1 of the FMAIImporter interface.
    	 *
    	 * Return value: if implemented, this method must return the version
    	 * number of this interface the I/O provider is supporting.
    	 *
    	 * Defaults to 1.
    	 *
    	 * Since: 2.30
    	 */
    	guint   ( *get_version )( const FMAIExporter *instance );

    	/**
    	 * get_name:
    	 * @instance: this FMAIExporter instance.
    	 *
    	 * Return value: if implemented, the method should return the name to be
    	 * displayed, as a newly allocated string which will be g_free() by the
    	 * caller.
    	 *
    	 * This may be the name of the module itself, but this also may be a
    	 * special name the modules gives to this interface.
    	 *
    	 * Defaults to a NULL string.
    	 *
    	 * Since: 2.30
    	 */
    	gchar * ( *get_name )   ( const FMAIExporter *instance );

    	/**
    	 * get_formats:
    	 * @instance: this FMAIExporter instance.
    	 *
    	 * For its own internal needs, FileManager-Actions requires each export
    	 * format has its own unique identifier (in fact, just a small ASCII
    	 * string).
    	 *
    	 * To avoid any collision, the format identifier is allocated by the
    	 * FileManager-Actions maintainers team. If you wish develop a new export
    	 * format, and so need a new format identifier, please contact the
    	 * maintainers (see filemanager-actions.doap).
    	 *
    	 * Return value:
    	 * - Interface v1:
    	 *   a null-terminated list of FMAIExporterFormat structures
    	 *   which describes the formats supported by this FMAIExporter
    	 *   provider.
    	 *   The returned list is owned by the FMAIExporter provider,
    	 *   and should not be freed nor released by the caller.
    	 *
    	 * - Interface v2:
    	 *   a GList of FMAIExporterFormatv2 structures
    	 *   which describes the formats supported by this FMAIExporter
    	 *   provider.
    	 *   The caller should then invoke the free_formats() method
    	 *   in order the provider be able to release the resources
    	 *   allocated to the list.
    	 *
    	 * Defaults to NULL (no format at all).
    	 *
    	 * Since: 2.30
    	 */
    	void *  ( *get_formats )( const FMAIExporter *instance );

    	/**
    	 * free_formats:
    	 * @instance: this FMAIExporter instance.
    	 * @formats: a null-terminated list of FMAIExporterFormatv2 structures,
    	 *  as returned by get_formats() method above.
    	 *
    	 * Free the resources allocated to the @formats list.
    	 *
    	 * Since: 3.2
    	 */
    	void    ( *free_formats )( const FMAIExporter *instance, GList *formats );

    	/**
    	 * to_file:
    	 * @instance: this FMAIExporter instance.
    	 * @parms: a FMAIExporterFileParmsv2 structure.
    	 *
    	 * Exports the specified 'exported' to the target 'folder' in the required
    	 * 'format'.
    	 *
    	 * Return value: the FMAIExporterExportStatus status of the operation.
    	 *
    	 * Since: 2.30
    	 */
    	guint   ( *to_file )    ( const FMAIExporter *instance, FMAIExporterFileParmsv2 *parms );

    	/**
    	 * to_buffer:
    	 * @instance: this FMAIExporter instance.
    	 * @parms: a FMAIExporterFileParmsv2 structure.
    	 *
    	 * Exports the specified 'exported' to a newly allocated 'buffer' in
    	 * the required 'format'. The allocated 'buffer' will be g_free()
    	 * by the caller.
    	 *
    	 * Return value: the FMAIExporterExportStatus status of the operation.
    	 *
    	 * Since: 2.30
    	 */
    	guint   ( *to_buffer )  ( const FMAIExporter *instance, FMAIExporterBufferParmsv2 *parms );
    } FMAIExporterInterface;

This defines the interface that a FMAIExporter should implement.

#### Members

`get_version` () | [should] returns the version of this interface the plugin implements. |
`get_name` () | [should] returns the public plugin name. |
`get_formats` () | [should] returns the list of supported formats. |
`free_formats` () | [should] free a list of formats |
`to_file` () | [should] exports an item to a file. |
`to_buffer` () | [should] exports an item to a buffer. |

### enum FMAIExporterExportStatus

The reasons for which an item may not have been exported

#### Members

FMA_IEXPORTER_CODE_OK | export OK. |
FMA_IEXPORTER_CODE_INVALID_ITEM | exported item was found invalid. |
FMA_IEXPORTER_CODE_INVALID_TARGET | selected target was found invalid. |
FMA_IEXPORTER_CODE_INVALID_FORMAT | asked format was found invalid. |
FMA_IEXPORTER_CODE_UNABLE_TO_WRITE | unable to write the item. |
FMA_IEXPORTER_CODE_ERROR | other undetermined error. |

### FMAIExporterFormat

    typedef struct {
    	gchar     *format;
    	gchar     *label;
    	gchar     *description;
    } FMAIExporterFormat;

`FMAIExporterFormat` has been deprecated since version 3.2 and should not be used in newly-written code.

This structure describes a supported output format. It must be provided by each FMAIExporter implementation (see e.g. `src/io-xml/naxml-formats.c`).

When listing available export formats, the instance returns a GList of these structures.

#### Members

gchar *`format`; | format identifier (ascii). |
gchar *`label`; | short label to be displayed in dialog (UTF-8 localized) |
gchar *`description`; | full description of the format (UTF-8 localized); mainly used in the export assistant. |

### FMAIExporterFormatv2

    typedef struct {
    	guint         version;
    	FMAIExporter *provider;
    	gchar        *format;
    	gchar        *label;
    	gchar        *description;
    	GdkPixbuf    *pixbuf;
    } FMAIExporterFormatv2;

`FMAIExporterFormatv2` is deprecated and should not be used in newly-written code.

This structure describes a supported output format. It must be provided by each FMAIExporter implementation (see e.g. `src/io-xml/fma-xml-formats.c`).

When listing available export formats, the `provider` must return a GList of these structures.

#### Members

guint `version`; | the version of this FMAIExporterFormatv2 structure; equals to 2; since structure version 1. |
FMAIExporter *`provider`; | the FMAIExporter provider for this format; since structure version 2. |
gchar *`format`; | format identifier (ascii, allocated by the FileManager-Actions team); since structure version 2. |
gchar *`label`; | short label to be displayed in dialog (UTF-8 localized); since structure version 2. |
gchar *`description`; | full description of the format (UTF-8 localized); mainly used as a tooltip; since structure version 2. |
GdkPixbuf *`pixbuf`; | an image to be associated with this export format; this pixbuf is supposed to be rendered with GTK_ICON_SIZE_DIALOG size; since structure version 2. |

Since: 3.2

### FMAIExporterFileParms

    typedef struct {
    	guint          version;
    	FMAObjectItem *exported;
    	gchar         *folder;
    	GQuark         format;
    	gchar         *basename;
    	GSList        *messages;
    } FMAIExporterFileParms;

`FMAIExporterFileParms` has been deprecated since version 3.2 and should not be used in newly-written code.

The structure that the implementation receives as a parameter of `FMAIExporterInterface.to_file()` interface method.

#### Members

guint `version`; | [in] version of this structure; since structure version 1. |
FMAObjectItem *`exported`; | [in] exported FMAObjectItem-derived object; since structure version 1. |
gchar *`folder`; | [in] URI of the target folder; since structure version 1. |
GQuark `format`; | [in] export format as a GQuark; since structure version 1. |
gchar *`basename`; | [out] basename of the exported file; since structure version 1. |
GSList *`messages`; | [in/out] a GSList list of localized strings; the provider may append messages to this list, but shouldn't reinitialize it; since structure version 1. |

### FMAIExporterFileParmsv2

    typedef struct {
    	guint          version;
    	guint          content;
    	FMAObjectItem *exported;
    	gchar         *folder;
    	gchar         *format;
    	gchar         *basename;
    	GSList        *messages;
    } FMAIExporterFileParmsv2;

The structure that the plugin receives as a parameter of `FMAIExporterInterface.to_file()` interface method.

#### Members

guint `version`; | [in] version of this structure; equals to 2; since structure version 1. |
guint `content`; | [in] version of the content of this structure; equals to 1; since structure version 2. |
FMAObjectItem *`exported`; | [in] exported FMAObjectItem-derived object; since structure version 1. |
gchar *`folder`; | [in] URI of the target folder; since structure version 1. |
gchar *`format`; | [in] export format string identifier; since structure version 1. |
gchar *`basename`; | [out] basename of the exported file; since structure version 1. |
GSList *`messages`; | [in/out] a GSList list of localized strings; the provider may append messages to this list, but shouldn't reinitialize it; since structure version 1. |

Since: 3.2

### FMAIExporterBufferParms

    typedef struct {
    	guint          version;
    	FMAObjectItem *exported;
    	GQuark         format;
    	gchar         *buffer;
    	GSList        *messages;
    } FMAIExporterBufferParms;

`FMAIExporterBufferParms` has been deprecated since version 3.2 and should not be used in newly-written code.

The structure that the plugin receives as a parameter of `FMAIExporterInterface.to_buffer()` interface method.

#### Members

guint `version`; | [in] version of this structure; since structure version 1. |
FMAObjectItem *`exported`; | [in] exported FMAObjectItem-derived object; since structure version 1. |
GQuark `format`; | [in] export format as a GQuark; since structure version 1. |
gchar *`buffer`; | [out] buffer which contains the exported object; since structure version 1. |
GSList *`messages`; | [in/out] a GSList list of localized strings; the provider may append messages to this list, but shouldn't reinitialize it; since structure version 1. |

### FMAIExporterBufferParmsv2

    typedef struct {
    	guint          version;
    	guint          content;
    	FMAObjectItem *exported;
    	gchar         *format;
    	gchar         *buffer;
    	GSList        *messages;
    } FMAIExporterBufferParmsv2;

The structure that the plugin receives as a parameter of `FMAIExporterInterface.to_buffer()` interface method.

#### Members

guint `version`; | [in] version of this structure; equals to 2; since structure version 1. |
guint `content`; | [in] version of the content of this structure; equals to 1; since structure version 2. |
FMAObjectItem *`exported`; | [in] exported FMAObjectItem-derived object; since structure version 1. |
gchar *`format`; | [in] export format string identifier; since structure version 2. |
gchar *`buffer`; | [out] buffer which contains the exported object; since structure version 1. |
GSList *`messages`; | [in/out] a GSList list of localized strings; the provider may append messages to this list, but shouldn't reinitialize it; since structure version 1. |

Since: 3.2