Why am I getting an implicit declaration error for a predefined gtk function?

Question

I am trying to read text in from a file and insert that text into a text box.

This is the code I am using.

FILE *infile;
GdkFont *fixed_font;
infile = fopen("text.txt", "r");



fixed_font = gdk_font_load ("-misc-fixed-medium-r-*-*-*-140-*-*-*-*-*-*");

if (infile) {
char buffer[1024];
int nchars;

while (1)
  {
    nchars = fread(buffer, 1, 1024, infile);
    gtk_text_insert(view, fixed_font, NULL, NULL, buffer, nchars);

    if (nchars < 1024)
      break;
  }

fclose (infile);

These are my includes

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

When I compile I get this warning:

warning: implicit declaration of function ‘gtk_text_insert’ 

I have read on this forum and others that implicit declaration errors come from using functions before they are declared. However, gtk_text_insert() is included in the header file so how can this be implicit?

I am using the following software:

  gtk version 2.20.1

  Red Hat Enterprise Linux Server release 6.5

Answer 1

GtkText is deprecated and unsupported. It is known to be buggy. To use it, you must define the symbol GTK_ENABLE_BROKEN prior to including the GTK+ header files. Use GtkTextView instead.

From https://developer.gnome.org/gtk2/stable/GtkText.html