On 01/25/2013 03:27 AM, Ian MacArthur wrote:
>
> On 25 Jan 2013, at 04:56, Moses McKnight wrote:
>
>> I'm using the latest svn of fltk 1.3, and I have a simple window
>> with an Fl_Output. When I call the value(const char*) function
>> with a string I get a segmentation fault, and running it in the
>> debugger shows it happens in the Fl_Widget::clear_changed()
>> function, called at the beginning of the
>> Fl_Input_::static_value(const char* str, int len) function.
>>
>> Any idea why this might be happening? I am using a number of
>> Fl_Output in other windows in this same application without any
>> problems.
>
>
> Without seeing more of your code, it's hard to say: a common reason
> for this sort of thing is that something (perhaps the string?) has
> been declared stack-automatic in some function, and has fallen out of
> scope before it is used... Does that sound likely here?
No, because here is my call: info_output->value("Testing");
I've done a little more testing and figured out that I can set the value
from outside the class, but not from a function in the class.
I also get a seg fault when I click the "Close" button, which is similar
I think because it calls a function on a object in the class.
I've included some of the code below. It is generated by fluid and the
same kind of thing is working in other windows in the same application.
The generate_license() function is in a separate file so I don't have to
change the fluid generated files, and that is where I call
info_output->value("Testing");
Here is my header file:
// generated by Fast Light User Interface Designer (fluid) version 1.0302
#ifndef licensegen_h
#define licensegen_h
#include <FL/Fl.H>
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Value_Input.H>
#include <FL/Fl_Output.H>
#include <FL/Fl_Button.H>
class licgen {
public:
void generate_license();
Fl_Double_Window* make_window();
Fl_Double_Window *window;
Fl_Value_Input *hub_id_input;
Fl_Output *info_output;
private:
inline void cb_Generate_i(Fl_Button*, void*);
static void cb_Generate(Fl_Button*, void*);
inline void cb_Close_i(Fl_Button*, void*);
static void cb_Close(Fl_Button*, void*);
};
#endif
And here is the main code:
// generated by Fast Light User Interface Designer (fluid) version 1.0302
#include "licensegen.h"
void licgen::cb_Generate_i(Fl_Button*, void*) {
generate_license();
}
void licgen::cb_Generate(Fl_Button* o, void* v) {
((licgen*)(o->parent()->user_data()))->cb_Generate_i(o,v);
}
void licgen::cb_Close_i(Fl_Button*, void*) {
window->hide();
}
void licgen::cb_Close(Fl_Button* o, void* v) {
((licgen*)(o->parent()->user_data()))->cb_Close_i(o,v);
}
Fl_Double_Window* licgen::make_window() {
{ window = new Fl_Double_Window(435, 130, "License Generator");
window->labelsize(12);
window->user_data((void*)(this));
{ hub_id_input = new Fl_Value_Input(5, 30, 275, 25, "ID#");
hub_id_input->labelsize(12);
hub_id_input->textsize(12);
hub_id_input->align(Fl_Align(FL_ALIGN_TOP_LEFT));
} // Fl_Value_Input* hub_id_input
{ info_output = new Fl_Output(5, 63, 420, 25);
info_output->color(FL_BACKGROUND_COLOR);
info_output->labelsize(12);
info_output->textsize(12);
info_output->align(Fl_Align(FL_ALIGN_TOP_LEFT));
} // Fl_Output* info_output
{ Fl_Button* o = new Fl_Button(290, 30, 135, 25, "Generate
License...");
o->labelsize(12);
o->callback((Fl_Callback*)cb_Generate);
} // Fl_Button* o
{ Fl_Button* o = new Fl_Button(180, 98, 80, 25, "Close");
o->labelsize(12);
o->callback((Fl_Callback*)cb_Close);
} // Fl_Button* o
window->end();
} // Fl_Double_Window* window
return window;
}
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