> Not sure offhand, but I'd say try printing the value of 'this'
> within your RefreshPlayerList() method, to see if it's different
> when calling from the button callback vs. refresh_callback..
> if the values are different, that might be the reason.
>
> If that's not it, it would be best if you can write a short
> simple standalone 'compilable' program that demonstrates the
> problem, as it's hard to tell with a code snippet.
You are right, the value of 'this' is different.
Somehow i think add_timeout corrupts the pointer...
If have written a working example (VS 2005 Express)
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#include <fltk/run.h>
#include <fltk/Window.h>
#include <fltk/Button.h>
#include <fltk/IntInput.h>
#include <fltk/Output.h>
#include <fltk/Browser.h>
#include <cstdlib>
using namespace fltk;
class ObserverWindow : public Window {
Button start_button;
Browser browser_playerlist;
inline void refresh_callback_i() {
RefreshPlayerList();
fltk::add_timeout(1.0,(fltk::TimeoutHandler)refresh_callback,this);
}
static void refresh_callback(Widget*, void* v) {
((ObserverWindow*)v)->refresh_callback_i(); //bad pointer :(
}
inline void start_callback_i() {
RefreshPlayerList();
fltk::add_timeout(1.0,(fltk::TimeoutHandler)refresh_callback,this); //still
good pointer
}
static void start_callback(Widget*, void* v) {
((ObserverWindow*)v)->start_callback_i(); //good pointer
}
public:
ObserverWindow(const char* label=0) :
Window(USEDEFAULT,USEDEFAULT,550,500,label,true),
start_button(160,180,40,20,"start"),
browser_playerlist(160, 60, 300, 100, "Player:") {
start_button.callback(start_callback,this);
end();
}
~ObserverWindow() {}
void RefreshPlayerList() {
browser_playerlist.remove_all();
browser_playerlist.redraw();
browser_playerlist.add("test",0,0,0,0);
}
};
int main(int argc, char ** argv) {
ObserverWindow wnd("crash_test");
wnd.show(argc,argv);
return run();
}
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I hope someone can tell me how i can fix this ? :)
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