Difference between revisions of "Truxton location get media id"
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This retrieves the [https://en.wikipedia.org/wiki/Universally_unique_identifier GUID] of the media the location came from. | This retrieves the [https://en.wikipedia.org/wiki/Universally_unique_identifier GUID] of the media the location came from. | ||
This corresponds to the <code>[MediaID]</code> column of the <code><nowiki>[</nowiki>[[Location Table|Location]]<nowiki>]</nowiki></code> table. | This corresponds to the <code>[MediaID]</code> column of the <code><nowiki>[</nowiki>[[Location Table|Location]]<nowiki>]</nowiki></code> table. | ||
| − | The value should be present in the <code>[ID]</code> column of the <code>[Media]</code> table. | + | The value should be present in the <code>[ID]</code> column of the <code><nowiki>[</nowiki>[[Media Table|Media]]<nowiki>]</nowiki></code> table. |
=Syntax= | =Syntax= | ||
| Line 20: | Line 20: | ||
=Sample= | =Sample= | ||
<source lang="C" highlight="14"> | <source lang="C" highlight="14"> | ||
| − | void dump_location(uint64_t location_handle) | + | void dump_location( uint64_t location_handle ) |
{ | { | ||
double value = 0; | double value = 0; | ||
| Line 27: | Line 27: | ||
char label[ 256 ]; | char label[ 256 ]; | ||
| − | truxton_location_get_label(location_handle, label, sizeof( label )); | + | truxton_location_get_label( location_handle, label, sizeof( label ) ); |
printf( "%s\n", label ); | printf( "%s\n", label ); | ||
| − | truxton_location_get_file_id(location_handle, guid_string, sizeof( guid_string )); | + | truxton_location_get_file_id( location_handle, guid_string, sizeof( guid_string ) ); |
printf( "File ID: %s\n", guid_string ); | printf( "File ID: %s\n", guid_string ); | ||
| − | truxton_location_get_media_id(location_handle, guid_string, sizeof( guid_string )); | + | truxton_location_get_media_id( location_handle, guid_string, sizeof( guid_string ) ); |
printf( "Media ID: %s\n", guid_string ); | printf( "Media ID: %s\n", guid_string ); | ||
| Line 52: | Line 52: | ||
} | } | ||
</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. | ||
Latest revision as of 07:52, 3 February 2024
This retrieves the GUID of the media the location came from.
This corresponds to the [MediaID] column of the [Location] table.
The value should be present in the [ID] column of the [Media] table.
Syntax
void truxton_location_get_media_id( uint64_t location_handle, char * destination_string, size_t max_size );
Parameters
location_handle
This handle comes from calling truxton_location_create() or truxton_child_file_create_location()
destination_string
The string to be written to.
max_size
The maximum number of characters that can be written to destination_string.
Sample
void dump_location( uint64_t location_handle )
{
double value = 0;
uint64_t ticks = 0;
char guid_string[ 40 ];
char label[ 256 ];
truxton_location_get_label( location_handle, label, sizeof( label ) );
printf( "%s\n", label );
truxton_location_get_file_id( location_handle, guid_string, sizeof( guid_string ) );
printf( "File ID: %s\n", guid_string );
truxton_location_get_media_id( location_handle, guid_string, sizeof( guid_string ) );
printf( "Media ID: %s\n", guid_string );
value = truxton_location_get_latitude( location_handle );
printf( "Latitude: %lf\n", value );
value = truxton_location_get_longitude( location_handle );
printf( "Longitude: %lf\n", value );
value = truxton_location_get_altitude( location_handle );
printf( "Altitude: %lf meters\n", value );
ticks = truxton_location_get_type( location_handle );
printf( "Type: %" PRIu64 "\n", ticks );
ticks = truxton_location_get_when( location_handle );
printf( "Ticks: %" PRIu64 "\n", ticks );
}
The PRIu64 in the sample code above is a standard way of formatting a 64-bit unsigned integer in C.
Over the years, different compilers on different operating systems used different format specifiers for things, these PRI 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.
