DCTag SDK: dc_tag_write.c

DCTag SDK 1.2.1

This is an example of how to write tag in the DataCenter.
#include <memory.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include "DCTag.h"
void print_tag_value ( DC_TAG * tag )
{
 time_t tt;
 struct tm * gmt;
 printf( "Value: %lf\n", tag->value );
 printf( "Quality: %04xH\n", (uint16_t) tag->quality );
 tt = tag->time;
 gmt = gmtime( &tt );
 printf(
 "Time Stamp (UTC): %04d-%02d-%02d %02d:%02d:%02d (%llu.%06u)\n\n",
 1900 + gmt->tm_year,
 gmt->tm_mon + 1,
 gmt->tm_mday,
 gmt->tm_hour,
 gmt->tm_min,
 gmt->tm_sec,
 tag->time,
 tag->usec );
}
int main ( int argc, char * argv[] )
{
 DC_TAG_HANDLE tag_handle;
 DC_TAG tag_value;
 double write_value = 0.0f;
 int rc;
 
 if ( argc != 3 )
 {
 printf( "usage: dc_tag_write <tag_name> <tag_value>\n" );
 return -1;
 }
 // initialize the DCTag SDK
 rc = dc_tag_init( 1, NULL, NULL );
 if ( rc != 0 )
 {
 printf( "dc_tag_init failed! error = %d\n", rc );
 return -2;
 }
 // open the tag
 tag_handle = dc_tag_open( argv[ 1 ], NULL );
 if ( NULL == tag_handle )
 {
 printf( "fail to open tag: %s\n", argv[ 1 ] );
 dc_tag_uninit();
 return -3;
 }
 // read tag
 memset( &tag_value, 0, sizeof( tag_value ) );
 rc = dc_tag_read( &tag_handle, &tag_value, 1 );
 if ( rc != 0 )
 {
 printf( "fail to read tag value! error = %d\n", rc );
 dc_tag_close( tag_handle );
 dc_tag_uninit();
 return -4;
 }
 if ( tag_value.quality < 0 )
 {
 printf( "we can't write the tag with the bad quality value: %d\n", tag_value.quality );
 dc_tag_close( tag_handle );
 dc_tag_uninit();
 return -5;
 }
 // write tag
 write_value = atof( argv[ 2 ] );
 rc = dc_tag_write( &tag_handle, &write_value, 1 );
 printf( "dc_tag_write with value = %lf return: %d\n", write_value, rc );
 printf( "\n" );
 // close tag handles
 dc_tag_close( tag_handle );
 // uninitialize the SDK
 dc_tag_uninit();
 
 return 0;
}
Generated on Thu May 19 2016 14:18:17 for DCTag SDK by
1.8.11
previous page start next page