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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>
static void errordumper(GPLogLevel level, const char *domain, const char *format,
va_list args, void *data) {
vfprintf(stdout, format, args);
fprintf(stdout, "\n");
}
static void enable_capture(Camera *canon, GPContext *canoncontext) {
int retval;
CameraWidget *rootconfig; /* okay, not really */
CameraWidget *actualrootconfig;
CameraWidget *child;
CameraWidget *capture = child;
const char *widgetinfo;
const char *widgetlabel;
int widgetid;
CameraWidgetType widgettype;
const int one=1;
printf("Get root config.\n");
retval = gp_camera_get_config(canon, &rootconfig, canoncontext);
actualrootconfig = rootconfig;
printf(" Retval: %d\n", retval);
printf("Get main config.\n");
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 capture config.\n");
rootconfig = child;
retval = gp_widget_get_child_by_name(rootconfig, "capture", &child);
printf(" Retval: %d\n", retval);
gp_widget_get_name(capture, &widgetinfo);
printf("config name: %s\n", widgetinfo );
gp_widget_get_label(capture, &widgetlabel);
printf("config label: %s\n", widgetlabel);
gp_widget_get_id(capture, &widgetid);
printf("config id: %d\n", widgetid);
gp_widget_get_type(capture, &widgettype);
printf("config type: %d == %d \n", widgettype, GP_WIDGET_TOGGLE);
printf("Set value.\n");
retval = gp_widget_set_value(capture, &one);
printf(" Retval: %d\n", retval);
printf("Enabling capture.\n");
retval = gp_camera_set_config(canon, actualrootconfig, canoncontext);
printf(" Retval: %d\n", retval);
}
/* 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 retval;
CameraFile *canonfile;
const char *filedata;
unsigned long int filesize;
printf("Capturing.\n");
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);
retval = gp_file_new(&canonfile);
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_file_get_data_and_size(canonfile, &filedata, &filesize);
printf(" Retval: %d\n", retval);
int fd = open(fn, O_CREAT | O_WRONLY, 0644);
write(fd, filedata, filesize);
close(fd);
printf("Deleting.\n");
retval = gp_camera_file_delete(canon, camera_file_path.folder, camera_file_path.name,
canoncontext);
printf(" Retval: %d\n", retval);
gp_file_free(canonfile);
}
int
main(int argc, char **argv) {
Camera *canon;
int retval;
gp_log_add_func(GP_LOG_ERROR, errordumper, NULL);
GPContext *canoncontext = gp_context_new();
gp_camera_new(&canon);
/* 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);
printf(" Retval: %d\n", retval);
enable_capture(canon, canoncontext);
/*set_capturetarget(canon, canoncontext);*/
capture_to_file(canon, canoncontext, "foo.jpg");
gp_camera_exit(canon, canoncontext);
return 0;
}
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