GTK+ Forums

gtkguan

there is an "open " menu item,

Code: (C)
1 2 3 4 5 6	menuitem = gtk_image_menu_item_new_from_stock(GTK_STOCK_OPEN, accel_group); gtk_menu_shell_append(GTK_MENU_SHELL(filemenu), menuitem); g_signal_connect(G_OBJECT(menuitem), "activate", G_CALLBACK(file_open), (gchar *)pfilename);

when I press "Open", a file chooser dialog opens. And when I chooser a file, I want to get this name of file. How does it returned?
Thank you?

dreblen · Posted: Mon Sep 01, 2008 10:30 pm Post subject:

in your file_open function, create a GtkFileChooserDialog and run it,
then use gtk_file_chooser_get_filename to get the file name:
http://library.gnome.org/devel/gtk/stable/GtkFileChooserDialog.html#gtk-file-chooser-dialog-new
http://library.gnome.org/devel/gtk/stable/GtkDialog.html#gtk-dialog-run
http://library.gnome.org/devel/gtk/stable/GtkFileChooser.html#gtk-file-chooser-get-filename
Here's an example:

Code: (C)

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18

void file_open(GtkMenuItem *item, gpointer user_data)
{
GtkWidget *dlg;
GtkResponseType response;
gchar *filename;

dlg = gtk_file_chooser_dialog_new("Open", NULL, GTK_FILE_CHOOSER_ACTION_OPEN, "_Open", GTK_RESPONSE_OK, "_Cancel", GTK_RESPONSE_CANCEL, NULL);
response = gtk_dialog_run(GTK_DIALOG(dlg));
switch(response)
{
case GTK_RESPONSE_OK:
filename = gtk_file_chooser_get_filename(GTK_FILE_CHOOSER(dlg));
break;
default:
break;
}
gtk_widget_destroy(dlg);
}

gtkguan · Posted: Tue Sep 02, 2008 5:46 am Post subject:

Thank you, dreblen.
I have used gtk_file_chooser_dialog_new. I want to use file chooser dialog to return the file name. And so I can create a widget displaying a image. The following is code slice. I think the trouble is the argument "filename" in function gdk_pixbuf_new_from_file

Code: (C)
1 2 3 4	pixbuf = gdk_pixbuf_new_from_file(filename, NULL); image = gtk_image_new_from_pixbuf(gdk_pixbuf_scale_simple(pixbuf, (int)(gdk_pixbuf_get_width(pixbuf)0.25), (int)(gdk_pixbuf_get_height(pixbuf)0.25), GDK_INTERP_BILINEAR)); gtk_box_pack_start(GTK_BOX(vbox), image, FALSE, FALSE, 0);

。
I have resolve this problem by adding the upper code silce in callback function file_open, just like this:

Code: (C)

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50

static void file_open (GtkMenuItem *menuitem, gpointer vbox)
{
GtkWidget *file_open_dialog;
GSList *filenames;
GtkFileFilter *file_filter_bmp, *file_filter_all;
gint result;
gchar *filename;

GtkWidget *table;
GtkWidget *image;
GdkPixbuf *pixbuf;

file_open_dialog = gtk_file_chooser_dialog_new(_("打开文件"), NULL,
GTK_FILE_CHOOSER_ACTION_OPEN,
GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
GTK_STOCK_OPEN, GTK_RESPONSE_ACCEPT,
NULL);

gtk_file_chooser_set_current_folder(GTK_FILE_CHOOSER(file_open_dialog), g_get_home_dir ());

file_filter_bmp = gtk_file_filter_new();
file_filter_all = gtk_file_filter_new();
gtk_file_filter_set_name(file_filter_bmp, "BMP files (*.bmp)");
gtk_file_filter_set_name(file_filter_all, "All files (*.*)");
gtk_file_filter_add_pattern(file_filter_bmp, "*.bmp");
gtk_file_filter_add_pattern(file_filter_all, "*");
gtk_file_chooser_add_filter(GTK_FILE_CHOOSER(file_open_dialog), file_filter_bmp);
gtk_file_chooser_add_filter(GTK_FILE_CHOOSER(file_open_dialog), file_filter_all);
gtk_file_chooser_set_filter(GTK_FILE_CHOOSER(file_open_dialog), file_filter_bmp);
gtk_file_chooser_set_filter(GTK_FILE_CHOOSER(file_open_dialog), file_filter_all);

/* allow the user to choose only ONE file at a time. */
gtk_file_chooser_set_select_multiple(GTK_FILE_CHOOSER(file_open_dialog), FALSE);

result = gtk_dialog_run(GTK_DIALOG(file_open_dialog));
if(GTK_RESPONSE_ACCEPT == result)
{
filenames = gtk_file_chooser_get_filenames(GTK_FILE_CHOOSER(file_open_dialog));
filename = (gchar *)filenames->data;
}
gtk_widget_destroy(file_open_dialog);

pixbuf = gdk_pixbuf_new_from_file(filename, NULL);
image = gtk_image_new_from_pixbuf(gdk_pixbuf_scale_simple(pixbuf, (int)(gdk_pixbuf_get_width(pixbuf)*0.25),
(int)(gdk_pixbuf_get_height(pixbuf)*0.25), GDK_INTERP_BILINEAR));
gtk_box_pack_start(GTK_BOX(vbox), image, FALSE, FALSE, 0);
gtk_widget_show(image);

}

But I do not want let this two kinds of code be in one function. So is there other solutions? Thank you!

dreblen · Posted: Tue Sep 02, 2008 1:31 pm Post subject:

I guess I don't understand the problem, is the pixbuf not loading?
what two pieces of code don't you want to mix?

if the pixbuf isn't loading, I'd recommend using the GError argument of gdk_pixbuf_new_from_file:

Code: (C)
1 2 3 4 5 6 7 8 9	GError *err; err = NULL; pixbuf = gdk_pixbuf_new_from_file(filename, &err); if(err != NULL) { g_warning(err->message); g_error_free(err); return; }

gtkguan · Posted: Wed Sep 03, 2008 3:03 pm Post subject:

dreblen, thanks for your help. I have solved this problem.