g_strdup()

[Ignacio Nodal <inodal teleline es>]

Hi,

I'm using the g_strdup() function provided by glib, which is suppose to 
duplicate a string, to update a file name string stored in a gchar* from 
a GtkEntry.  In fact, it's a member of a my class, so I pass it in the 
constructor:


ParameterFile::ParameterFile(GtkWidget* parent, gchar* param)
{

 _file_name = param;
 _File_entry = 0; //It's created later

 _value_changed = 0;
....

}


I've connected the "activate" signal of the GtkEntry used show/enter the 
file name. In my callback I call a member function Update():

ParameterFile::Update()
{
  gchar *ch;

  ch = g_strdup(gtk_entry_get_text(GTK_ENTRY(_File_entry)));

  _value_changed = (strcmp(_file_name, ch) != 0);

  if (_value_changed) {
    if (_file_name != 0) g_free(_file_name);
    _file_name = g_strdup(ch);
  }

}

If I call g_print("post-g_strdup %s\n",_filename); it shows me the 
correct value.

If I call it in my main.cpp the value passed to the constructor, where 
the strign should be stored, points whereever it my be, but not where I 
want..


In my main.cpp, just testing, I use:

 gchar* _wrl_name = g_strdup("default.wrl");
 ParameterFile* entry_param = new ParameterFile(parent, _wrl_name);

 [...]

And a button that prints _wrl_name if clicked.

What's going wrong? Can I pass _wrl_name to my constructor or do I have 
to pass gchar**?

Thanks..

Someday I'll beat pointers...