Sam: /* Sample */

2021-02-06T11:09:15Z

Sample

Sam at 16:48, 26 December 2020

2020-12-26T16:48:40Z

Sam: Created page with "This corresponds to the `[Offset]` column of the `[EXIF]` table in the database. It is the offset into t..."

2020-12-26T16:46:48Z

Created page with "This corresponds to the <code>[Offset]</code> column of the <code><nowiki>[</nowiki>EXIF<nowiki>]</nowiki></code> table in the database. It is the offset into t..."

New page

This corresponds to the <code>[Offset]</code> column of the <code><nowiki>[</nowiki>[[EXIF Table|EXIF]]<nowiki>]</nowiki></code> table in the database.
It is the offset into the parent file where the EXIF data block began.

=Syntax=
<source lang="C">
uint64_t truxton_exif_get_offset( uint64_t exif_handle );
</source>

=Parameters=
==<code>exif_handle</code>==
This handle comes from calling <code>[[truxton_exif_create]]()</code> or <code>[[truxton_file_create_exif]]()</code>.

=Return value=
The offset into the parent file where the EXIF data block began.

=Sample=
<source lang="C" highlight="53">
void dump_exif( uint64_t exif_handle )
{
double floating_point_value = 0.0;
uint64_t integer_value = 0;

char id[ 65 ];

truxton_exif_get_id( exif_handle, id, sizeof( id ) );
printf( "ID: %s\n", id );

truxton_exif_get_file_id( exif_handle, id, sizeof( id ) );
printf( "File ID: %s\n", id );

truxton_exif_get_media_id( exif_handle, id, sizeof( id ) );
printf( "Media ID: %s\n", id );

truxton_exif_get_make( exif_handle, id, sizeof( id ) );
printf( "Make: %s\n", id );

truxton_exif_get_model( exif_handle, id, sizeof( id ) );
printf( "Model: %s\n", id );

truxton_exif_get_body_serial_number( exif_handle, id, sizeof( id ) );
printf( "Body serial number: %s\n", id );

truxton_exif_get_lens_serial_number( exif_handle, id, sizeof( id ) );
printf( "Lens serial number: %s\n", id );

integer_value = truxton_exif_get_device_time( exif_handle );
printf( "Device Time: %" PRIu64 "\n", integer_value );

integer_value = truxton_exif_get_gps_time( exif_handle );
printf( "GPS Time: %" PRIu64 "\n", integer_value );

floating_point_value = truxton_exif_get_focal_length( exif_handle );
printf( "35mm Focal Length: %lf\n", floating_point_value );

floating_point_value = truxton_exif_get_heading( exif_handle );
printf( "Heading: %lf degrees\n", floating_point_value );

floating_point_value = truxton_exif_get_latitude( exif_handle );
printf( "Latitude: %lf degrees\n", floating_point_value );

floating_point_value = truxton_exif_get_longitude( exif_handle );
printf( "Longitude: %lf degrees\n", floating_point_value );

floating_point_value = truxton_exif_get_altitude( exif_handle );
printf( "Altitude: %lf meters\n", floating_point_value );

integer_value = truxton_exif_get_shutter_count( exif_handle );
printf( "Shutter Count: %" PRIu64 "\n", integer_value );

integer_value = truxton_exif_get_offset( exif_handle );
printf( "EXIF Data Block found at offset %" PRIu64 "\n", integer_value );

integer_value = truxton_exif_get_gps_time_offset( exif_handle );
printf( "GPS Time offset: %" PRIu64 "\n", integer_value );

integer_value = truxton_exif_get_device_time_offset( exif_handle );
printf( "Device Time offset: %" PRIu64 "\n", integer_value );

integer_value = truxton_exif_get_latitude_offset( exif_handle );
printf( "Latitude offset: %" PRIu64 "\n", integer_value );

integer_value = truxton_exif_get_longitude_offset( exif_handle );
printf( "Longitude offset: %" PRIu64 "\n", integer_value );

integer_value = truxton_exif_get_altitude_offset( exif_handle );
printf( "Altitude offset: %" PRIu64 "\n", integer_value );

integer_value = truxton_exif_get_heading_offset( exif_handle );
printf( "Heading offset: %" PRIu64 "\n", integer_value );

integer_value = truxton_exif_get_focal_length_offset( exif_handle );
printf( "Focal Length offset: %" PRIu64 "\n", integer_value );

integer_value = truxton_exif_get_shutter_count_offset( exif_handle );
printf( "Shutter Count offset: %" PRIu64 "\n", integer_value );

integer_value = truxton_exif_get_thumbnail_offset_offset( exif_handle );
printf( "Thumbnail Offset offset: %" PRIu64 "\n", integer_value );

integer_value = truxton_exif_get_thumbnail_length_offset( exif_handle );
printf( "Thumbnail Length offset: %" PRIu64 "\n", integer_value );

integer_value = truxton_exif_get_make_offset( exif_handle );
printf( "Make offset: %" PRIu64 "\n", integer_value );

integer_value = truxton_exif_get_model_offset( exif_handle );
printf( "Model offset: %" PRIu64 "\n", integer_value );

integer_value = truxton_exif_get_body_serial_number_offset( exif_handle );
printf( "Body Serial Number offset: %" PRIu64 "\n", integer_value );

integer_value = truxton_exif_get_lens_serial_number_offset( exif_handle );
printf( "Lens Serial Number offset: %" PRIu64 "\n", integer_value );
}
</source>

← Older revision		Revision as of 11:09, 6 February 2021
Line 114:		Line 114:
	}		}
	</source>		</source>
		+
		+	The <code>PRIu64</code> in the sample code above is a standard way of [https://en.wikipedia.org/wiki/C_data_types#Printf_and_scanf_format_specifiers formatting] a 64-bit unsigned integer in C.
		+	Over the years, different compilers on different operating systems used different format specifiers for things, these <code>PRI</code> macros, along with some tricky string concatenation the compilers perform for you, allow you to maintain a single code base without a bunch of macro magic.

@@ Line 1: / Line 1: @@
 This corresponds to the <code>[Offset]</code> column of the <code><nowiki>[</nowiki>[[EXIF Table|EXIF]]<nowiki>]</nowiki></code> table in the database.
-It is the offset into the parent file where the EXIF data block began.
+It is the offset into the parent file where the [https://en.wikipedia.org/wiki/Exif EXIF] data block began.
 =Syntax=
@@ Line 12: / Line 12: @@
 =Return value=
-The offset into the parent file where the EXIF data block began.
+The offset into the parent file where the [https://en.wikipedia.org/wiki/Exif EXIF] data block began.
 =Sample=

Truxton exif get offset - Revision history

Sam: /* Sample */

Sam at 16:48, 26 December 2020

Sam: Created page with "This corresponds to the [Offset] column of the [EXIF] table in the database. It is the offset into t..."

Sam: Created page with "This corresponds to the `[Offset]` column of the `[EXIF]` table in the database. It is the offset into t..."