images.cpp

#ifdef WIN32
#include <windows.h>
#endif

/*
* Define handler functions required to ensure a clean shutdown of the PST Tracker when the
* application is terminated.
*/

static void Exithandler(int sig);

#ifdef WIN32
BOOL WINAPI ConsoleHandler(DWORD CEvent)
{
    Exithandler(CEvent);
    return TRUE;
}
#endif

/* End of handler functions */

#include <memory>
#include <iostream>

#include "pst-sdk.h"
#include "TrackerExceptions.h"

/* Control variable for main loop */
static bool running = true;

/* Number of data points to grab before application termination */
static const uint32_t numberOfSamplesToGrab = 1000;

/*
* Implementation of the PSTech::pstsdk::Listener class to receive tracking data.
* The OnTrackerData() callback function receives the data as soon as it becomes
* available.
*/
class MyListener : public PSTech::pstsdk::Listener
{
    virtual void OnTrackerData(PSTech::pstsdk::TrackerData& td)
    {
        static uint32_t samplesGrabbed = 0;
        if (samplesGrabbed++ >= numberOfSamplesToGrab)
            running = false;

        // Do something with the received data.
    }
} listener;

/*
* Create a shared pointer for storing the PSTech::pstsdk::Tracker object instance.
* By making use of a shared pointer, proper destruction of the PST Tracker connection
* is ensured in case the application is shut down.
*/
std::shared_ptr<PSTech::pstsdk::Tracker> pst;

/*
* Implement the exit handler to shut-down the PST Tracker connection on application terrmination.
*/
static void Exithandler(int sig)
{
    pst->Shutdown();
}

int main(int argc, char *argv[])
{
    // Register the exit handler with the application
#ifdef WIN32
    SetConsoleCtrlHandler((PHANDLER_ROUTINE)ConsoleHandler, TRUE);
#else
    signal(SIGTERM, Exithandler);
    signal(SIGKILL, Exithandler);
    signal(SIGQUIT, Exithandler);
    signal(SIGINT, Exithandler);
#endif

    // Implement error handling of PSTech::TrackerException exceptions to prevent 
    // improper PST Tracker shutdown on errors.
    try
    {
        // Create an instance of the Tracker object using the default configuration path and file names.
        pst = std::make_shared<PSTech::pstsdk::Tracker>();

        // Print version number of the tracker server being used.
        std::cout << "Running PST Server version " << pst->GetVersionInfo() << "\n";

        // Register the listener object to the tracker server.
        pst->AddTrackerListener(&listener);

        // Start the tracker server.
        pst->Start();

        // Perform a system check to see if the tracker server is running OK and print the result.
        std::cout << "System check: " << (int)pst->Systemcheck() << "\n\n";
        std::cout << "***************************\n\n";

        // Set the frame rate to 60 Hz.
        pst->SetFramerate(60);
        std::cout << "Current frame rate: " << pst->GetFramerate() << " Hz\n\n";

        // In order to start receiving images, enable image transfer. When image transfer is disabled, 
        // the vector of images returned by GetImage will be empty.
        pst->EnableImageTransfer();

        // The standard PST trackers will run at a reduced frame rate of 30 Hz when image transfer is enabled.
        // However, since this frame rate is temporary for as long as image transfer is enabled, that frame rate
        // will not be reported as the current frame rate.
        std::cout << "Enabled image transfer. Current frame rate: " << pst->GetFramerate() << " Hz\n\n";
        std::cout << "***************************\n\n";

        // Try to capture 100 images.
        for (int i = 0; i < 100; ++i)
        {
            // Get a reference to the last grabbed image in the PSTech::pstsdk::Image struct.
            // Note that enabling image transfer takes some time. While image transfer is being enabled,
            // the images vector in the PSTech::pstsdk::Image struct will be empty.
            PSTech::pstsdk::Image images;
            bool succes = pst->GetImage(images);
            std::cout << "Retrieval operation " << ((succes) ? "successful!\n" : "unsuccesful!\n\n");
            if (succes)
            {
                std::cout << "Retrieved " << images.images.size() << " image(s) of size: " << images.width << " X " << images.height << "\n\n";
                // Do something with the image.
            }
        }

        // Wait for 5 seconds, since this is > 4 seconds, image transfer will be disabled automatically.
        Sleep(5000);

        // Try to grab one image. Since image retrieval timed out, it should return an empty image vector.
        PSTech::pstsdk::Image images;
        bool succes = pst->GetImage(images);
        std::cout << "Retrieval operation " << ((succes) ? "successful!\n" : "unsuccesful!");
        if (succes)
        {
            std::cout << "Retrieved " << images.images.size() << " image(s) of size: " << images.width << " X " << images.height << "\n\n";
        }

        // Main loop, wait for auto-termination.
        while (running)
        {
            Sleep(100);
        }
    }
    catch (PSTech::TrackerException &e)
    {
        // Catch PSTech::TrackerException exceptions and print error messages.
        std::cout << e.full_description() << "\n";
    }

    // Make sure that the connection to the PST Tracker is shut down properly.
    pst->Shutdown();

    // Pause command line to see results.
    std::cout << "Press enter to continue...\n";
    std::cin.get();

    return 0;
}