Re: Help, I need filter text in function

[Thomas Mailund <mailund mailund dk>]

On Fri, 2001-08-31 at 03:28, javiercmx@correo.unam.mx wrote:
> Hi list
> 
> I write a function it admit numbers, the function is: 
> 
> void edit_clv_plt(GtkWidget *widget, gpointer data) {
>   char *tmpplt;
>   char ch = *((char *) data);
>   char *str;
>  
>   str = (char *) data;
>  
>   if(isdigit (ch) && strlen (str) == 1) { /*introducing a number*/
>      g_free(host.plt);                   
>     
>      /*it obtains the chain*/
>      tmpplt=gtk_editable_get_chars(GTK_EDITABLE(widget),0 ,-1); 
>      host.plt=g_strdup(tmpplt);
>     
>   } else {
>     Messages("Error","Write the number");  /*Function for Show Messages*/
>   }
> }                                  

I don't know what your data element is, so I can't really tell you what
is wrong with your code.

> The user write the numbers, in GtkEntry, the text is not allowed, the max digits
> is 3, but when running the program write a text, call function Messages, if
> write a number, call a function Messages, where this the error

I've attached a program that only allows you to type in digits, and only
up to three of those.  It is not a particullar good example, 'cause you
cant delete chars or move the cursor since these keys are also aborted,
but perhaps you can use it to get where you want.

	/mailund

-- 

I used up all my sick days, so I'm calling in dead.

#include <gtk/gtk.h>
#include <ctype.h>
#include <string.h>

static gboolean
key_event (GtkWidget *entry, GdkEvent * event)
{
  if ((strlen (gtk_entry_get_text (GTK_ENTRY (entry))) < 3)
      && isdigit(event->key.keyval))
    {
      // don't abort
      return FALSE;
    }
  // abort event
  gtk_signal_emit_stop_by_name (GTK_OBJECT (entry), "key_press_event");
  return TRUE;
}

int
main (int argc, char *argv[])
{
  GtkWidget *win;
  GtkWidget *entry;

  gtk_init (&argc, &argv);

  win = gtk_window_new (GTK_WINDOW_TOPLEVEL);

  entry = gtk_entry_new ();
  gtk_container_add (GTK_CONTAINER (win), entry);

  gtk_signal_connect (GTK_OBJECT (entry), "key_press_event",
		      GTK_SIGNAL_FUNC (key_event), entry);

  gtk_widget_show_all (win);

  gtk_main ();

  return 0;
}

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