Stefan aka Noneus

To better understand what exif tag is in which ifd I wrote a little exifviewer. A simple little programs which list all exif-tags from one picture and the ifd’s the tag belongs to.

#include <stdio.h>
#include <libexif/exif-data.h>

void display_entry(ExifEntry *entry, void *null) {
	char b[1024];
	exif_entry_get_value (entry, b, sizeof(b));
	printf("%s: %s\n",  exif_tag_get_name (entry->tag), b);
}

void display_content(ExifContent *content, void *null) {
	printf("\nEXIFIFD: %s:\n---------\n\n", exif_ifd_get_name(exif_content_get_ifd(content)));
	exif_content_foreach_entry (content, display_entry, NULL);
}

int main(int argc, char **argv) {
	ExifData *data;
	data = exif_data_new_from_file(argv[1]);
	if(data == NULL || argc != 2) {
		printf("Argument must be one valid jpg-file!\n");
		return(1);
	}
	exif_data_foreach_content (data, display_content, NULL);
	return 0;
}

Build it with(Install libexif-dev):

cc -lexif -lm -o exifviewer src/exifviewer.c