Difference between revisions of "Truxton location get when"
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(Created page with "This retrieves the timestamp, if present, of the location. This corresponds to the <code>[When]</code> column of the <code><nowiki>[</nowiki>Location<nowiki...") |
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=Sample= | =Sample= | ||
<source lang="C" highlight="29"> | <source lang="C" highlight="29"> | ||
| − | void dump_location(uint64_t location_handle) | + | void dump_location( uint64_t location_handle ) |
{ | { | ||
double value = 0; | double value = 0; | ||
| Line 24: | Line 24: | ||
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 49: | Line 49: | ||
} | } | ||
</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 07:01, 10 February 2021
This retrieves the timestamp, if present, of the location.
This corresponds to the [When] column of the [Location] table.
Syntax
uint64_t truxton_location_get_when( uint64_t location_handle );
Parameters
location_handle
This handle comes from calling truxton_location_create() or truxton_child_file_create_location()
Return value
The location's timestamp in FILETIME ticks. If no timestamp is associated with this location, zero is returned.
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.
