AxsunOCTCapture_C_example.c

This is example source code showing how to use the image capture functionality of AxsunOCTCapture in a ANSI C client application (Windows OS).

// AxsunOCTCapture_C_example.c : This file contains the 'main' function. Program execution begins and ends there.
//
 
#include "AxsunOCTCapture.h"        // for all AxsunOCTCapture functions, structs, enums, typedefs
 
#include <stdio.h>                  // for printf(); not related to AxsunOCTCapture functionality
#include <windows.h>                // for loop timer Sleep function; not related to AxsunOCTCapture functionality
#include <conio.h>                  // for console keyboard interaction; not related to AxsunOCTCapture functionality
 
//#define PCIEMODE                  // comment this line out for Ethernet interface, leave uncommented for PCIe interface   
 
int main()
{
    printf("Welcome to the AxsunOCTCapture Example Console Application (ANSI C version).\n");
 
    // declare local variables
    AOChandle session = NULL;
    AxErr retval = NO_AxERROR;
    char message[512];
 
    // create a capture session with 100 MB main image buffer
    if (retval = axStartSession(&session, 100)) goto axerror;
    
    // select capture interface for this session
#ifdef PCIEMODE
    if (retval = axSelectInterface(session, PCI_EXPRESS)) goto axerror;
#else
    if (retval = axSelectInterface(session, GIGABIT_ETHERNET)) goto axerror;
#endif
 
    // print message describing current capture interface status
    if (retval = axGetMessage(session, message)) goto axerror;
    printf(message); printf("\n");
 
    // setup OpenGL-based rendering
    if (retval = axSetupDisplay(session, 0, 0, 0, 1024, 512, 0)) goto axerror;
    if (retval = axAdjustBrightnessContrast(session, 1, 0, 1)) goto axerror;
 
    // NOTE: before proceeding with this program:
    //    TURN ON LASER EMISSION using AxsunOCTControl or AxsunOCTControl_LW API, or OCT Host or Hardware Control Tool GUI
    //    FOR GIGABIT_ETHERNET INTERFACE, need to set DAQ Imaging On mode using AxsunOCTControl or AxsunOCTControl_LW API, or OCT Host or Hardware Control Tool GUI
 
#ifdef PCIEMODE
    // FOR PCIe INTERFACE, 
    if (retval = axPipelineMode(session, EIGHT_BIT, CHAN_1)) goto axerror; // set pipeline mode to 8-bit processed data on Channel 1
    if (retval = axImagingCntrlPCIe(session, -1)) goto axerror;                  // set DAQ Imaging On mode (live)
#endif
 
    // declare local variables
    uint32_t imaging, last_packet, last_frame, last_image, dropped_packets, frames_since_sync;      // for axGetStatus()
    request_prefs_t prefs = { 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0 };                // initialize struct variable
    image_info_t info;
    int32_t counter = 0;
 
    while (!_kbhit()) {                 // display loop until a key is pressed (this function in conio.h)
 
#ifdef _WIN32
        // handle Win32 events in OpenGL rendering window
        MSG msg;
        if (PeekMessage(&msg, 0, 0, 0, PM_REMOVE)) DispatchMessage(&msg);
#endif // _WIN32
 
        // get Main Image Buffer status 
        if (retval = axGetStatus(session, &imaging, &last_packet, &last_frame, &last_image, &dropped_packets, &frames_since_sync)) goto axerror;
 
        if (imaging) {
            // get image info on most recent image enqueued
            if (retval = axGetImageInfo(session, MOST_RECENT_IMAGE, &info)) {
                // print error details
                printf("axGetImageInfo() returned %d ", retval);
                axGetErrorString(retval, message);
                printf(message); printf("\n");
            }
            else {
                // if no errors, configure the request preferences and then request the image for display
                prefs.request_mode = DISPLAY_ONLY;
                prefs.which_window = 1;
                retval = axRequestImage(session, info.image_number, prefs, 0, NULL, &info);
 
                // and print some statistics to the console (every 25th iteration)
                if (!(counter % 25)) {
                    printf("Image number: %d, Width: %d, Dropped Packets: %d", info.image_number, info.width, dropped_packets);
                    if (info.force_trig) printf(" *** TRIGGER TOO SLOW, FORCE TRIGGERED ***");
                    if (info.trig_too_fast) printf(" *** TRIGGER TOO FAST ***");
                    printf("\n");
                }
            }
        }
        else {
            if (!(counter % 50)) {  // print every 50th iteration
                printf("Imaging is off. Turn on laser emission and set DAQ to Imaging On mode.\n");
            }
        }
 
        // increment loop counter
        counter++;
 
        // loop timer for approximately 30 fps update rate (this function in windows.h)
        Sleep(33);                      
    }
 
#ifdef PCIEMODE
    // FOR PCIe INTERFACE, set DAQ Imaging Off mode (idle)
    if (retval = axImagingCntrlPCIe(session, 0)) goto axerror;
#endif
 
axerror:
    if (retval) {                       // if we got here because of an error, print error code description
        printf("Error %d: ", retval);
        axGetErrorString(retval, message);
        printf(message); printf("\n");
    }
 
    printf("Quitting...\n\n");
 
    // stop the capture session
    axStopSession(session);
 
}