8.12 File Information Example

The final example in this chapter prints all information about a file that GnomeVFS can find. Not only do you see the file information structure from Section 8.3.3, but MIME types (Section 8.7) pop up, as do some portability issues.
Run this program on the command line, using a URI string as a single argument.
 /* -*-coding: utf-8;-*- */ /* file.c -- retrieve and summarize file information */ #include <string.h> /* for strlen() */ #include <time.h> /* for ctime() */ #include <libgnome/libgnome.h> #include <libgnomevfs/gnome-vfs.h> #include <libgnomevfs/gnome-vfs-mime-handlers.h> #ifdef LINUX # include <linux/fs.h> /* for MAJOR() und MINOR() */ #endif /* LINUX */ int print_file_error(GnomeVFSResult code, const gchar *uri_string) {   const gchar *error_str;   error_str = gnome_vfs_result_to_string(code);   g_printerr("%s: file error (%d): %s\n", uri_string, code, error_str);   return 1; } int main(int argc, char **argv) {   gchar *file_uri_str;   GnomeVFSResult result;   GnomeVFSFileInfo *info;   GnomeVFSMimeApplication *application;   gchar *icon_name, *icon_name_tmp, *icon_path, *tmp;   if (argc != 2)   {      g_printerr("Usage: %s <uri>\n", argv[0]);      exit (1);   }   /* initialize GnomeVFS */   if (!gnome_vfs_init())   {      g_error("%s: could not initialize GnomeVFS\n", argv[0]);      exit (2);   }   /* determine URI */   file_uri_str = argv[1];   /* load a new file info structure with information about the URI */   info = gnome_vfs_file_info_new();   result = gnome_vfs_get_file_info(file_uri_str, info,                                    GNOME_VFS_FILE_INFO_GET_MIME_TYPE);   if (result != GNOME_VFS_OK)   {      exit(print_file_error(result, file_uri_str));   }   g_print("URI: %s\n", file_uri_str);   g_print("base name: %s ", info->name);   if (info->valid_fields & GNOME_VFS_FILE_INFO_FIELDS_TYPE)   {      switch (info->type) {         case GNOME_VFS_FILE_TYPE_UNKNOWN:            g_print("(unknown type)\n"); break;         case GNOME_VFS_FILE_TYPE_REGULAR:             g_print("(normal file)\n"); break;         case GNOME_VFS_FILE_TYPE_DIRECTORY:             g_print("(directory)\n"); break;         case GNOME_VFS_FILE_TYPE_FIFO:             g_print("(FIFO/named pipe)\n"); break;         case GNOME_VFS_FILE_TYPE_SOCKET:             g_print("(socket)\n"); break;         case GNOME_VFS_FILE_TYPE_CHARACTER_DEVICE:             g_print("(character device)\n"); break;         case GNOME_VFS_FILE_TYPE_BLOCK_DEVICE:             g_print("(block device)\n"); break;         case GNOME_VFS_FILE_TYPE_SYMBOLIC_LINK:             g_print("(symbolic link)\n"); break;      }   }   if (info->valid_fields & GNOME_VFS_FILE_INFO_FIELDS_SYMLINK_NAME)   {      g_print("- symbolic link points to %s\n", info->symlink_name);   }   if (info->valid_fields & GNOME_VFS_FILE_INFO_FIELDS_PERMISSIONS)   {      g_print("- Permissions: 0%o\n", info->permissions);   }   if (info->valid_fields & GNOME_VFS_FILE_INFO_FIELDS_FLAGS)   {      if (info->flags & GNOME_VFS_FILE_FLAGS_LOCAL)      {         g_print("- is on a local file system"); #ifdef LINUX         if (info->valid_fields & GNOME_VFS_FILE_INFO_FIELDS_DEVICE)         {            g_print(" (device %d, %d)",                    (int)MAJOR(info->device), (int)MINOR(info->device));         } #endif /* LINUX */         if (info->valid_fields & GNOME_VFS_FILE_INFO_FIELDS_INODE)         {            g_print(" (inode %"\ GNOME_VFS_SIZE_FORMAT_STR")", info->inode);         }      }      g_print("\n");   }   if (info->valid_fields & GNOME_VFS_FILE_INFO_FIELDS_LINK_COUNT)   {      g_print("- %d link%s\n",              info->link_count, (info->link_count == 1) ? "" : "s");   }   g_print("- user id (UID): %d\n",info->uid);   g_print("- group id (GID): %d\n", info->gid);   if (info->valid_fields & GNOME_VFS_FILE_INFO_FIELDS_SIZE)   {      tmp = gnome_vfs_format_file_size_for_display(info->size);      g_print("- size: %s ", tmp);      g_free(tmp);   }   if (info->valid_fields & GNOME_VFS_FILE_INFO_FIELDS_BLOCK_COUNT)   {      g_print(" (%"\ GNOME_VFS_SIZE_FORMAT_STR" 512-byte blocks)\n", info->block_count);   } else {      g_print("\n");   }   if (info->valid_fields & GNOME_VFS_FILE_INFO_FIELDS_IO_BLOCK_SIZE)   {      g_print("- optimal read/write buffer: %d bytes\n", info->io_block_size);   }   if (info->valid_fields & GNOME_VFS_FILE_INFO_FIELDS_ATIME)   {      g_print("- last access:       %s", ctime(&(info->atime)));   }   if (info->valid_fields & GNOME_VFS_FILE_INFO_FIELDS_MTIME)   {      g_print("- last modification: %s", ctime(&(info->mtime)));   }   if (info->valid_fields & GNOME_VFS_FILE_INFO_FIELDS_CTIME)   {      g_print("- last change:       %s", ctime(&(info->ctime)));   }   if (info->valid_fields & GNOME_VFS_FILE_INFO_FIELDS_MIME_TYPE)   {      g_print("- MIME type: %s (%s)\n", info->mime_type,              gnome_vfs_mime_get_description(info->mime_type));      switch (gnome_vfs_mime_get_default_action_type(info->mime_type))      {         case GNOME_VFS_MIME_ACTION_TYPE_NONE:            g_print("- no default action\n");            break;         case GNOME_VFS_MIME_ACTION_TYPE_APPLICATION:            application =               gnome_vfs_mime_get_default_application(info->mime_type);            g_print("- default action: open with application %s\n",                    application? application->name : "");            gnome_vfs_mime_application_free(application);            break;         case GNOME_VFS_MIME_ACTION_TYPE_COMPONENT:            g_print("- default action: open with a component\n");            break;      }      /* somewhat roundabout way of finding an icon */      icon_name = g_strdup(gnome_vfs_mime_get_icon(info->mime_type));      if (icon_name)      {         g_print("- icon name: %s\n", icon_name);         icon_path = gnome_vfs_icon_path_from_filename(icon_name);         /* path doesn't exist? try with .png extension */         if (!icon_path)         {            icon_name_tmp = g_strconcat(icon_name, ".png", NULL);            icon_path = gnome_vfs_icon_path_from_filename(icon_name_tmp);            g_free(icon_name_tmp);         }         if (icon_path)         {            g_print("- icon path: %s\n", icon_path);            g_free(icon_path);         }         g_free(icon_name);      }   }   /* clean up GnomeVFS, exit */   gnome_vfs_file_info_unref(info);   gnome_vfs_shutdown();   exit (0); }