dear sir
thank you for your reply
i shall take time to read code from examples and if i encounter any problem i
shall post.
best wishes
>
> > void dMainWin::cb_button_app(Fl_Button * button, void* m_win)
> > {
> > button->deactivate();
> > Fl::check();
> > system("./app");
> > button->activate();
> > Fl::check();
> > }
>
> Your problem is that "system" generally will not return until the "app"
> it launches finishes. So fltk is stuck in the callback waiting for your
> app to finish.
> You want to find another way to launch your app, "system" is a poor tool
> in most cases...
>
> What platform are you on? That makes a difference.
> On OSX, and maybe win32, it may be enough to use "open" to invoke your
> app. Or maybe, on win32, try ShellExecute().
> On unix, you probably want execv().
>
> Actually - now I think of it, there's an ideal "worked example" of how
> to launch external programs in the file "fl_open_uri.cxx" - check the
> code there and see how it achieves the result.
>
> However: You don't want to be doing any significant amount of processing
> in the button callback - rather, you want the button callback just to
> signal that the app should launch and do the real work "elsewhere" in
> your program.
>
> If you have the source for the app, it would probably be cleaner to
> build the GUI into it, rather than just trying to wrap it around an
> existing executable.
>
> The examples in the test folder show a variety of approaches you could
> try...
>
> > i have problems with re-drawing my button-tool bar (my fltk=20
> > application) when i cross with some other window across=20
> > everything inside my window vanish..
>
> This sounds like your code is not allowing the fltk run-loop to proceed
> - possibly due to the problem identified above.
>
> Again, I can only suggest you study the examples. If you are still have
> this problem, post a minimal compilable example that exhibits the error,
> and we can show you how to proceed.
>
>
>
>
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