Compdigitec Labs

« | Home | »

The “Gtk-CRITICAL gtk_text_buffer_emit_insert assertion” warning in PHP-GTK2

By admin | August 30, 2008

If your internationalized PHP-GTK2 apps have ever failed to work, you probably received the following message in the terminal before:

Gtk-CRITICAL **: gtk_text_buffer_emit_insert: assertion `g_utf8_validate (text, len, NULL)' failed

This means that you have been using or passing non-UTF8 (good chance that it is CP1252 on Windows) strings to PHP-GTK2 classes and methods, such as GtkWindow, GtkLabel or GtkTextBuffer. To fix this, you should use iconv to convert those non-UTF8 strings. Below is a list of commonly used encodings:

To use this list, take the encoding and put it in parameter 1. See below for examples:


// Convert from Chinese, Simplified
$result = iconv(“GB2312”,“UTF-8”,$source);

// Convert from Greek
$result = iconv(“ISO-8859-7”,“UTF-8”,$source);

// Convert from Arabic
$result = iconv(“ISO-8859-6”,“UTF-8”,$source);

// Convert from French, German, and other Western languages
$result = iconv(“windows-1252”,“UTF-8”,$source);


If, as an exception, that you don’t have the iconv extension (included on most PHP-GTK2 setups), you can change the php-gtk.codepage directive. However, this is not flexible and can only be used for one language.

If you found this article helpful or useful, please help Compdigitec by spreading the word or by leaving a comment. Don’t forget to subscribe to Compdigitec Labs for more interesting articles!

If you found this article helpful or interesting, please help Compdigitec spread the word. Don’t forget to subscribe to Compdigitec Labs for more useful and interesting articles!

Topics: PHP | 1 Comment »

One Response to “The “Gtk-CRITICAL gtk_text_buffer_emit_insert assertion” warning in PHP-GTK2”

  1. sbobet Says:
    June 12th, 2021 at 18:20

    … [Trackback]

    […] Find More Info here to that Topic: […]