1.  Create a new project (Console App)

2.  Configure your new project

3.  Paste the sample code below into the cpp file

#include "tobii/tobii.h"
#include "tobii/tobii_streams.h"
#include <stdio.h>
#include <assert.h>
#include <string.h>

void gaze_point_callback( tobii_gaze_point_t const* gaze_point, void* /* user_data */)
{
    // Check that the data is valid before using it
    if( gaze_point->validity == TOBII_VALIDITY_VALID )
        printf( "Gaze point: %f, %f\n",
            gaze_point->position_xy[ 0 ],
            gaze_point->position_xy[ 1 ] );
}

void url_receiver( char const* url, void* user_data )
{
    char* buffer = (char*)user_data;
    if( *buffer != '\0' ) return; // only keep first value

    if( strlen( url ) < 256 )
        strcpy( buffer, url );
}

int main()
{
    // Create API
    tobii_api_t* api = NULL;
    tobii_error_t result = tobii_api_create( &api, NULL, NULL );
    assert( result == TOBII_ERROR_NO_ERROR );

    // Enumerate devices to find connected eye trackers, keep the first
    char url[ 256 ] = { 0 };
    result = tobii_enumerate_local_device_urls( api, url_receiver, url );
    assert( result == TOBII_ERROR_NO_ERROR );
    if(*url == '\0')
    {
        printf("Error: No device found\n");
        return 1;
    }

    // Connect to the first tracker found
    tobii_device_t* device = NULL;
    result = tobii_device_create( api, url, TOBII_FIELD_OF_USE_INTERACTIVE, &device );
    assert( result == TOBII_ERROR_NO_ERROR );

    // Subscribe to gaze data
    result = tobii_gaze_point_subscribe( device, gaze_point_callback, 0 );
    assert( result == TOBII_ERROR_NO_ERROR );

    // This sample will collect 1000 gaze points
    for( int i=0; i<1000; i++ )
    {
        // Optionally block this thread until data is available. Especially useful if running in a separate thread.
        result = tobii_wait_for_callbacks( 1, &device );
        assert( result == TOBII_ERROR_NO_ERROR || result == TOBII_ERROR_TIMED_OUT );

        // Process callbacks on this thread if data is available
        result = tobii_device_process_callbacks( device );
        assert( result == TOBII_ERROR_NO_ERROR );
    }

    // Cleanup
    result = tobii_gaze_point_unsubscribe( device );
    assert( result == TOBII_ERROR_NO_ERROR );
    result = tobii_device_destroy( device );
    assert( result == TOBII_ERROR_NO_ERROR );
    result = tobii_api_destroy( api );
    assert( result == TOBII_ERROR_NO_ERROR );
    return 0;
}

4.  Right-click the project -> Properties -> Configuration Properties -> C/C++ -> General -> Additional Include Directories

Add the include folder path

5.  Configuration Properties -> Linker -> General -> Additional Library Directories

Add the lib folder path

6.  Configuration Properties -> Linker -> Input -> Additional Dependencies

Add the lib name: tobii_stream_engine.lib

7.  Run and receive the gaze data!

8.  If you happen to receive this error, add “using namespace std” in the sample script

ref <https://stackoverflow.com/questions/57101085/how-to-fix-compile-error-this-function-or-variable-may-be-unsafe-strcpy>