Re: is this correct way to open file in buffer?
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
On 01/30/2013 07:39 AM, Rudra Banerjee wrote:
Dear friends, I am trying hard to get rid of file reading and editing (as
evident from my previous post) Here is a small code where I tried to open
my file in a buffer and scan. Its small, 50 line code. I will be grateful
if anybody kindly have a look and tell if this is really opening the file
from buffer or still using the file. Please help.
I am coming late into this thread, so please forgive the following question(s).
I would like clarification opening the file from buffer or still using the
file.
In C, there is an api that allows us to open a file, and then associate a
memory location with the file's contents. There after, any modification to the
file, automatically shows in the buffer (i.e. no read() or re-read is
required) and any modification to the file buffer will automatically show on
disk (without the necessity of a write()).
Is this what you are trying to do ?
If yes, then the below will not accomplish this. The C api is to do a standard
open(2) and then a mmap(2) to associate the file's buffer to a fixed memory
location - I am happy to supply more details upon a confirmation.
All the best,
- -Greg
void open_file(GtkWidget *widget, gpointer data){ GScanner *scanner;
GHashTable *table; char* fd; gsize length; GError* error=NULL; GtkWidget
*dialog; //, *entry; GtkFileFilter *filter; dialog =
gtk_file_chooser_dialog_new(Open File, NULL,
GTK_FILE_CHOOSER_ACTION_OPEN, GTK_STOCK_OPEN, GTK_RESPONSE_ACCEPT,
GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL, NULL);
filter = gtk_file_filter_new(); gtk_file_filter_set_name(filter, All files
(*.*)); gtk_file_filter_add_pattern(filter, *);
gtk_file_chooser_add_filter(GTK_FILE_CHOOSER(dialog), filter);
filter = gtk_file_filter_new(); gtk_file_filter_set_name(filter, Bibtex
file (*.bib)); gtk_file_filter_add_pattern(filter, *.bib);
gtk_file_chooser_add_filter(GTK_FILE_CHOOSER(dialog), filter);
gtk_file_chooser_set_filter(GTK_FILE_CHOOSER(dialog), filter);
if (gtk_dialog_run(GTK_DIALOG(dialog)) == GTK_RESPONSE_ACCEPT) { filename =
gtk_file_chooser_get_filename(GTK_FILE_CHOOSER(dialog));
gtk_list_store_clear (store); g_file_get_contents(filename, fd, length ,
error); g_assert(!error);
scanner = g_scanner_new (NULL); g_scanner_input_text (scanner, fd,
CHAR_BUFF);
table = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_free);
do { g_hash_table_remove_all (table); parse_entry (scanner, table);
output_entry (table);
g_scanner_peek_next_token (scanner); } while (scanner-next_token !=
G_TOKEN_EOF scanner-next_token != G_TOKEN_ERROR);
/* finsish parsing */ g_scanner_destroy (scanner); g_hash_table_destroy
(table);
gtk_label_set_text(GTK_LABEL(flabel), filename);
gtk_widget_destroy(dialog); } else gtk_widget_destroy(dialog); }
___ gtk-app-devel-list mailing
list gtk-app-devel-list@gnome.org
https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
- --
+-+
Please also check the log file at /dev/null for additional information.
(from /var/log/Xorg.setup.log)
| Greg Hosler ghos...@redhat.com|
+-+
-BEGIN PGP SIGNATURE-
Version: GnuPG v1.4.13 (GNU/Linux)
Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/
iEYEARECAAYFAlEIYewACgkQ404fl/0CV/TEZwCgrUZ9iXok5ykJLMAg0dn8QfAU
EDsAn2oAgw6aoXMG39yWQSu1RW7o8Gux
=b+22
-END PGP SIGNATURE-
___
gtk-app-devel-list mailing list
gtk-app-devel-list@gnome.org
https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: is this correct way to open file in buffer?
Well,
my final goal is to able to edit the file, but not save every time
something has changed.
So, in irc and other place, i was instructed to use get_contents method.
Can you kindly clarify where I went wrong?
On Wed, 2013-01-30 at 07:57 +0800, Gregory Hosler wrote:
On 01/30/2013 07:39 AM, Rudra Banerjee wrote:
Dear friends, I am trying hard to get rid of file reading and editing (as
evident from my previous post) Here is a small code where I tried to open
my file in a buffer and scan. Its small, 50 line code. I will be grateful
if anybody kindly have a look and tell if this is really opening the file
from buffer or still using the file. Please help.
I am coming late into this thread, so please forgive the following
question(s).
I would like clarification opening the file from buffer or still using the
file.
In C, there is an api that allows us to open a file, and then associate a
memory location with the file's contents. There after, any modification to the
file, automatically shows in the buffer (i.e. no read() or re-read is
required) and any modification to the file buffer will automatically show on
disk (without the necessity of a write()).
Is this what you are trying to do ?
If yes, then the below will not accomplish this. The C api is to do a standard
open(2) and then a mmap(2) to associate the file's buffer to a fixed memory
location - I am happy to supply more details upon a confirmation.
All the best,
-Greg
void open_file(GtkWidget *widget, gpointer data){ GScanner *scanner;
GHashTable *table; char* fd; gsize length; GError* error=NULL; GtkWidget
*dialog; //, *entry; GtkFileFilter *filter; dialog =
gtk_file_chooser_dialog_new(Open File, NULL,
GTK_FILE_CHOOSER_ACTION_OPEN, GTK_STOCK_OPEN, GTK_RESPONSE_ACCEPT,
GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL, NULL);
filter = gtk_file_filter_new(); gtk_file_filter_set_name(filter, All files
(*.*)); gtk_file_filter_add_pattern(filter, *);
gtk_file_chooser_add_filter(GTK_FILE_CHOOSER(dialog), filter);
filter = gtk_file_filter_new(); gtk_file_filter_set_name(filter, Bibtex
file (*.bib)); gtk_file_filter_add_pattern(filter, *.bib);
gtk_file_chooser_add_filter(GTK_FILE_CHOOSER(dialog), filter);
gtk_file_chooser_set_filter(GTK_FILE_CHOOSER(dialog), filter);
if (gtk_dialog_run(GTK_DIALOG(dialog)) == GTK_RESPONSE_ACCEPT) { filename =
gtk_file_chooser_get_filename(GTK_FILE_CHOOSER(dialog));
gtk_list_store_clear (store); g_file_get_contents(filename, fd, length ,
error); g_assert(!error);
scanner = g_scanner_new (NULL); g_scanner_input_text (scanner, fd,
CHAR_BUFF);
table = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_free);
do { g_hash_table_remove_all (table); parse_entry (scanner, table);
output_entry (table);
g_scanner_peek_next_token (scanner); } while (scanner-next_token !=
G_TOKEN_EOF scanner-next_token != G_TOKEN_ERROR);
/* finsish parsing */ g_scanner_destroy (scanner); g_hash_table_destroy
(table);
gtk_label_set_text(GTK_LABEL(flabel), filename);
gtk_widget_destroy(dialog); } else gtk_widget_destroy(dialog); }
___ gtk-app-devel-list mailing
list gtk-app-devel-list@gnome.org
https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
___
gtk-app-devel-list mailing list
gtk-app-devel-list@gnome.org
https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: is this correct way to open file in buffer?
On Wed, Jan 30, 2013 at 8:39 AM, Rudra Banerjee
rudra.baner...@aol.co.uk wrote:
Dear friends,
I am trying hard to get rid of file reading and editing (as evident from
my previous post)
Here is a small code where I tried to open my file in a buffer and scan.
Its small, 50 line code.
I will be grateful if anybody kindly have a look and tell if this is
really opening the file from buffer or still using the file. Please
help.
I can't tell you what it is 'still' doing, however in the code portions
which you've posted here, you are first reading the contents of the
file into a buffer using g_file_get_contents(); and then parsing
that buffer afterwards.
I assume this is what you're after, however I should point out
that naming your allocated buffer 'fd' is thoroughly confusing
to the reader.
At first glance, it would appear that your scanner is operating
on an fd, i.e. a file descriptor, not an allocated buffer.
Cheers,
-Tristan
void open_file(GtkWidget *widget, gpointer data){
GScanner *scanner;
GHashTable *table;
char* fd;
gsize length;
GError* error=NULL;
GtkWidget *dialog; //, *entry;
GtkFileFilter *filter;
dialog = gtk_file_chooser_dialog_new(Open File, NULL,
GTK_FILE_CHOOSER_ACTION_OPEN,
GTK_STOCK_OPEN, GTK_RESPONSE_ACCEPT,
GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
NULL);
filter = gtk_file_filter_new();
gtk_file_filter_set_name(filter, All files (*.*));
gtk_file_filter_add_pattern(filter, *);
gtk_file_chooser_add_filter(GTK_FILE_CHOOSER(dialog), filter);
filter = gtk_file_filter_new();
gtk_file_filter_set_name(filter, Bibtex file (*.bib));
gtk_file_filter_add_pattern(filter, *.bib);
gtk_file_chooser_add_filter(GTK_FILE_CHOOSER(dialog), filter);
gtk_file_chooser_set_filter(GTK_FILE_CHOOSER(dialog), filter);
if (gtk_dialog_run(GTK_DIALOG(dialog)) == GTK_RESPONSE_ACCEPT) {
filename = gtk_file_chooser_get_filename(GTK_FILE_CHOOSER(dialog));
gtk_list_store_clear (store);
g_file_get_contents(filename, fd, length , error);
g_assert(!error);
scanner = g_scanner_new (NULL);
g_scanner_input_text (scanner, fd, CHAR_BUFF);
table = g_hash_table_new_full (g_str_hash, g_str_equal, g_free,
g_free);
do
{
g_hash_table_remove_all (table);
parse_entry (scanner, table);
output_entry (table);
g_scanner_peek_next_token (scanner);
}
while (scanner-next_token != G_TOKEN_EOF
scanner-next_token != G_TOKEN_ERROR);
/* finsish parsing */
g_scanner_destroy (scanner);
g_hash_table_destroy (table);
gtk_label_set_text(GTK_LABEL(flabel), filename);
gtk_widget_destroy(dialog);
}
else
gtk_widget_destroy(dialog);
}
___
gtk-app-devel-list mailing list
gtk-app-devel-list@gnome.org
https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
___
gtk-app-devel-list mailing list
gtk-app-devel-list@gnome.org
https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
