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/* compile with gcc -Wall -o canon-capture -lgphoto2 canon-capture.c
 * This code released into the public domain 21 July 2008
 * This program does the equivalent of:
 * gphoto2 --shell
 *   > set-config capture=1
 *   > capture-image-and-download
 * compile with gcc -Wall -o canon-capture -lgphoto2 canon-capture.c
 * Taken from: http://credentiality2.blogspot.com/2008/07/linux-libgphoto2-image-capture-from.html 

#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <gphoto2/gphoto2.h>

#include "samples.h"

static void errordumper(GPLogLevel level, const char *domain, const char *format,
                 va_list args, void *data) {
  vfprintf(stdout, format, args);
  fprintf(stdout, "\n");

/* This seems to have no effect on where images go
void set_capturetarget(Camera *canon, GPContext *canoncontext) {
      int retval;
      printf("Get root config.\n");
      CameraWidget *rootconfig; // okay, not really
      CameraWidget *actualrootconfig;

      retval = gp_camera_get_config(canon, &rootconfig, canoncontext);
      actualrootconfig = rootconfig;
      printf("  Retval: %d\n", retval);

      printf("Get main config.\n");
      CameraWidget *child;
      retval = gp_widget_get_child_by_name(rootconfig, "main", &child);
      printf("  Retval: %d\n", retval);

      printf("Get settings config.\n");
      rootconfig = child;
      retval = gp_widget_get_child_by_name(rootconfig, "settings", &child);
      printf("  Retval: %d\n", retval);

      printf("Get capturetarget.\n");
      rootconfig = child;
      retval = gp_widget_get_child_by_name(rootconfig, "capturetarget", &child);
      printf("  Retval: %d\n", retval);

      CameraWidget *capture = child;

      const char *widgetinfo;
      gp_widget_get_name(capture, &widgetinfo);
      printf("config name: %s\n", widgetinfo );

      const char *widgetlabel;
      gp_widget_get_label(capture, &widgetlabel);
      printf("config label: %s\n", widgetlabel);

      int widgetid;
      gp_widget_get_id(capture, &widgetid);
      printf("config id: %d\n", widgetid);

      CameraWidgetType widgettype;
      gp_widget_get_type(capture, &widgettype);
      printf("config type: %d == %d \n", widgettype, GP_WIDGET_RADIO);

      printf("Set value.\n");

      // capture to ram should be 0, although I think the filename also plays into
      // it
      int one=1;
      retval = gp_widget_set_value(capture, &one);
      printf("  Retval: %d\n", retval);

      printf("Enabling capture to CF.\n");
      retval = gp_camera_set_config(canon, actualrootconfig, canoncontext);
      printf("  Retval: %d\n", retval);

static void
capture_to_file(Camera *canon, GPContext *canoncontext, char *fn) {
      int fd, retval;
      CameraFile *canonfile;
      CameraFilePath camera_file_path;


      /* NOP: This gets overridden in the library to /capt0000.jpg */
      strcpy(camera_file_path.folder, "/");
      strcpy(camera_file_path.name, "foo.jpg");

      retval = gp_camera_capture(canon, GP_CAPTURE_IMAGE, &camera_file_path, canoncontext);
      printf("  Retval: %d\n", retval);

      printf("Pathname on the camera: %s/%s\n", camera_file_path.folder, camera_file_path.name);

      fd = open(fn, O_CREAT | O_WRONLY, 0644);
      retval = gp_file_new_from_fd(&canonfile, fd);
      printf("  Retval: %d\n", retval);
      retval = gp_camera_file_get(canon, camera_file_path.folder, camera_file_path.name,
                 GP_FILE_TYPE_NORMAL, canonfile, canoncontext);
      printf("  Retval: %d\n", retval);

      retval = gp_camera_file_delete(canon, camera_file_path.folder, camera_file_path.name,
      printf("  Retval: %d\n", retval);


main(int argc, char **argv) {
      Camera      *canon;
      int   retval;
      GPContext *canoncontext = sample_create_context();

      gp_log_add_func(GP_LOG_ERROR, errordumper, NULL);

      /* When I set GP_LOG_DEBUG instead of GP_LOG_ERROR above, I noticed that the
       * init function seems to traverse the entire filesystem on the camera.  This
       * is partly why it takes so long.
       * (Marcus: the ptp2 driver does this by default currently.)
      printf("Camera init.  Takes about 10 seconds.\n");
      retval = gp_camera_init(canon, canoncontext);
      if (retval != GP_OK) {
            printf("  Retval: %d\n", retval);
            exit (1);
      canon_enable_capture(canon, TRUE, canoncontext);
      /*set_capturetarget(canon, canoncontext);*/
      capture_to_file(canon, canoncontext, "foo.jpg");
      gp_camera_exit(canon, canoncontext);
      return 0;

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