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Execute command into a GtkTextView (C and Libglade)

 
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Micah Carrick
Never Seen the Sunlight


Joined: 21 Sep 2005
Posts: 421
Location: Portland, OR USA
PostPosted: Fri Nov 30, 2007 9:39 pm    Post subject: Execute command into a GtkTextView (C and Libglade) Reply with quote
This is in response to a question I saw on Ubuntu Forums. Figured it'd be a good example. Shows how to use g_command_line_sync() to output a command into a GtkTextView.



main.c
Code: (C)
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/*
Example running a command into a GtkTextView by Micah Carrick
Written for www.gtkforums.com
Compile using:
gcc -Wall -g main.c -o example `pkg-config --cflags --libs gtk+-2.0 libglade-2.0` 
*/

#include <gtk/gtk.h>
#include <glade/glade.h>

/* structure to hold references to our widgets */
typedef struct
{       
        GtkWidget               *entry;
        GtkWidget               *textview;
} MyWidgets;
               
/* call back function for when the button is pressed */
static void
on_execute_button_clicked (GtkWidget* widget, gpointer user_data)
{
        MyWidgets               *widgets;
        gchar                   *output;       
        const gchar             *command;       
        GError                  *error = NULL; 
        GtkTextBuffer           *buffer;
             
        widgets = (MyWidgets *)user_data;
        command = gtk_entry_get_text (GTK_ENTRY (widgets->entry));
       
        /* execute command */     
        g_spawn_command_line_sync (command, &output, NULL, NULL, &error);
       
        if (error != NULL)
        {
                GtkWidget *dialog;
               
                /* create an error dialog containing the error message */
                dialog = gtk_message_dialog_new (NULL, GTK_DIALOG_DESTROY_WITH_PARENT,
                                                GTK_MESSAGE_ERROR,
                                                GTK_BUTTONS_OK,
                                                error->message);
                gtk_window_set_title (GTK_WINDOW (dialog), "Error");
               
                /* run the dialog */
                gtk_dialog_run (GTK_DIALOG (dialog));
               
                /* clean up memory used by dialog and error */
                gtk_widget_destroy (dialog);   
                g_error_free(error);
               
                return;
        }
       
        /* get the text buffer */
        buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (widgets->textview));
       
        /* set the text in the buffer to the output */
        gtk_text_buffer_set_text (buffer, output, -1);
       
        /* free the output string */
        g_free (output);   
}

int
main (int argc, char *argv[])
{
       
        GtkWidget               *window;
        GladeXML                *gxml;
        MyWidgets               *widgets;
        PangoFontDescription    *font_desc;
       
        widgets = g_slice_new (MyWidgets);
       
        /* initialize the GTK+ library */
        gtk_init (&argc, &argv);

        /* build GladeXML object from the glade XML file */
        gxml = glade_xml_new ("example.glade", NULL, NULL);

        /* get widgets from GladeXML object */
        window = glade_xml_get_widget (gxml, "window");
        widgets->entry = glade_xml_get_widget (gxml, "execute_entry");
        widgets->textview = glade_xml_get_widget (gxml, "output_textview");
       
        /* call gtk_main_quit() when the window's "x" is clicked */
        glade_xml_signal_connect (gxml, "gtk_main_quit",
            G_CALLBACK (gtk_main_quit));

        /*
        Call on_button_clicked() when execute_button is clicked, passing the
        MyWidget struct to the function as the user_data
        */
        glade_xml_signal_connect_data (gxml, "on_execute_button_clicked",
            G_CALLBACK (on_execute_button_clicked), widgets);

        /* free GladeXML object */
        g_object_unref (G_OBJECT (gxml));
             
        /* use a fixed width font on the text view so the output looks proper */
       
        font_desc = pango_font_description_from_string ("monospace 10");
        gtk_widget_modify_font (widgets->textview, font_desc);     
        pango_font_description_free (font_desc);     
             
        /* show the main window */
        gtk_widget_show (window);

        gtk_main ();
       
        return 0;     
}



example.glade

Code: (XML/HTML)
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE glade-interface SYSTEM "glade-2.0.dtd">
<!--Generated with glade3 3.4.0 on Fri Nov 30 13:06:29 2007 -->
<glade-interface>
  <widget class="GtkWindow" id="window">
    <property name="events">GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK</property>
    <property name="border_width">10</property>
    <signal name="destroy" handler="gtk_main_quit"/>
    <child>
      <widget class="GtkVBox" id="vbox1">
        <property name="visible">True</property>
        <property name="events">GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK</property>
        <child>
          <widget class="GtkHBox" id="hbox1">
            <property name="visible">True</property>
            <property name="events">GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK</property>
            <property name="spacing">5</property>
            <child>
              <widget class="GtkEntry" id="execute_entry">
                <property name="visible">True</property>
                <property name="can_focus">True</property>
                <property name="events">GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK</property>
              </widget>
            </child>
            <child>
              <widget class="GtkButton" id="execute_button">
                <property name="visible">True</property>
                <property name="can_focus">True</property>
                <property name="receives_default">True</property>
                <property name="events">GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK</property>
                <property name="label" translatable="yes">gtk-execute</property>
                <property name="use_stock">True</property>
                <property name="response_id">0</property>
                <signal name="clicked" handler="on_execute_button_clicked"/>
              </widget>
              <packing>
                <property name="expand">False</property>
                <property name="position">1</property>
              </packing>
            </child>
          </widget>
          <packing>
            <property name="expand">False</property>
          </packing>
        </child>
        <child>
          <widget class="GtkScrolledWindow" id="scrolledwindow1">
            <property name="visible">True</property>
            <property name="can_focus">True</property>
            <property name="events">GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK</property>
            <property name="border_width">2</property>
            <property name="hscrollbar_policy">GTK_POLICY_AUTOMATIC</property>
            <property name="vscrollbar_policy">GTK_POLICY_AUTOMATIC</property>
            <property name="shadow_type">GTK_SHADOW_ETCHED_IN</property>
            <child>
              <widget class="GtkTextView" id="output_textview">
                <property name="visible">True</property>
                <property name="can_focus">True</property>
                <property name="events">GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK</property>
              </widget>
            </child>
          </widget>
          <packing>
            <property name="position">1</property>
          </packing>
        </child>
      </widget>
    </child>
  </widget>
</glade-interface>
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gege2061



Joined: 04 Jan 2007
Posts: 3
Location: France
PostPosted: Fri Dec 07, 2007 8:58 am    Post subject: Reply with quote
Hello,

Some comments :
  • Why use Libglade and not new GtkBuilder Widget?
  • If command takes times, it's worth a better use g_spawn_command_line_async
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Micah Carrick
Never Seen the Sunlight


Joined: 21 Sep 2005
Posts: 421
Location: Portland, OR USA
PostPosted: Fri Dec 07, 2007 4:09 pm    Post subject: Reply with quote
Quote:
Why use Libglade and not new GtkBuilder Widget?


Because I have not yet learned anything about GtkBuilder, but it's on my TODO list. :)

Quote:
If command takes times, it's worth a better use g_spawn_command_line_async


Very true. I was just doing a very, very simple example. Readers will want to look over the Spawning Processes documentation.
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gege2061



Joined: 04 Jan 2007
Posts: 3
Location: France
PostPosted: Mon Dec 10, 2007 3:13 pm    Post subject: Reply with quote
Micah Carrick wrote:
Because I have not yet learned anything about GtkBuilder, but it's on my TODO list. :)

GtkBuilder is "juste" a libglade integration in GTK+.

First delete line 33 in example.glade (bug #496344) :
Code: (XML/HTML)
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<property name="response_id">0</property>


Convert .glade file in GtkBuilder XML format :
Code: (Plaintext)
1
gtk-builder-convert example.glade example.xml


And remplace glade_* functions :
Code: (C)
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/*
Example running a command into a GtkTextView by Micah Carrick
Written for www.gtkforums.com
Compile using:
gcc -Wall -g main.c -o example `pkg-config --cflags --libs gtk+-2.0 libglade-2.0`
*/

#include <gtk/gtk.h>

/* structure to hold references to our widgets */
typedef struct
{
        GtkWidget               *entry;
        GtkWidget               *textview;
} MyWidgets;

/* call back function for when the button is pressed */
static void
on_execute_button_clicked (GtkWidget* widget, gpointer user_data)
{
        MyWidgets               *widgets;
        gchar                   *output;
        const gchar             *command;
        GError                  *error = NULL;
        GtkTextBuffer           *buffer;

        widgets = (MyWidgets *)user_data;
        command = gtk_entry_get_text (GTK_ENTRY (widgets->entry));

        /* execute command */
        g_spawn_command_line_sync (command, &output, NULL, NULL, &error);

        if (error != NULL)
        {
                GtkWidget *dialog;

                /* create an error dialog containing the error message */
                dialog = gtk_message_dialog_new (NULL, GTK_DIALOG_DESTROY_WITH_PARENT,
                                                GTK_MESSAGE_ERROR,
                                                GTK_BUTTONS_OK,
                                                error->message);
                gtk_window_set_title (GTK_WINDOW (dialog), "Error");

                /* run the dialog */
                gtk_dialog_run (GTK_DIALOG (dialog));

                /* clean up memory used by dialog and error */
                gtk_widget_destroy (dialog);
                g_error_free(error);

                return;
        }

        /* get the text buffer */
        buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (widgets->textview));

        /* set the text in the buffer to the output */
        gtk_text_buffer_set_text (buffer, output, -1);

        /* free the output string */
        g_free (output);
}

int
main (int argc, char *argv[])
{

        GtkWidget               *window;
        GtkBuilder              *gxml;
        MyWidgets               *widgets;
        PangoFontDescription    *font_desc;

        widgets = g_slice_new (MyWidgets);

        /* initialize the GTK+ library */
        gtk_init (&argc, &argv);

        /* build GladeXML object from the glade XML file */
        gxml = gtk_builder_new ();
        gtk_builder_add_from_file (gxml, "example.xml", NULL);

        /* get widgets from GladeXML object */
        window = GTK_WIDGET (gtk_builder_get_object (gxml, "window"));
        widgets->entry = GTK_WIDGET (gtk_builder_get_object (gxml, "execute_entry"));
        widgets->textview = GTK_WIDGET (gtk_builder_get_object (gxml, "output_textview"));

        /* call gtk_main_quit() when the window's "x" is clicked */
        g_signal_connect (G_OBJECT (window), "delete-event", gtk_main_quit,
                          NULL);

        /*
        Call on_button_clicked() when execute_button is clicked, passing the
        MyWidget struct to the function as the user_data
        */
        g_signal_connect (gtk_builder_get_object (gxml, "execute_button"),
                          "clicked", G_CALLBACK (on_execute_button_clicked),
                          widgets);

        /* free GladeXML object */
        g_object_unref (G_OBJECT (gxml));

        /* use a fixed width font on the text view so the output looks proper */

        font_desc = pango_font_description_from_string ("monospace 10");
        gtk_widget_modify_font (widgets->textview, font_desc);
        pango_font_description_free (font_desc);

        /* show the main window */
        gtk_widget_show (window);

        gtk_main ();

        return 0;
}


;)
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