Re: Progress bars and syscals

[Paolo Costabel <paolo zebradevelopment com>]

You need to call

while( g_main_iteration (FALSE));

to update the progress bar. The gtk_progress_bar_set_fraction queues 
draw requests that are then executed
inside gtk main event loop. Be careful that calling g_main_iteration 
also processes user messages, so if the user
clicks on something, the corresponding code will be executed inside the 
while. This may cause unwanted effects.

Fireel wrote:

> Hello,
>
>   Since i'm quite new to both C and Gtk, i met a problem which i am 
> not able to solve. The     base  of the problem is that i have a task, 
> which should fetch several files from the internet. When a button is 
> pressed, a new window with a progress bar opens and indicates the 
> progress of the task. Basicly, since i thought C is a linear language, 
> i just added several system() calls and added 
> gtk_progress_bar_set_fraction between them like so:
>
> ...
>   system("wget file.a");
>   gtk_progress_bar_set_fraction(GTK_PROGRESS_BAR(pb1), 0.3);
>   system("wget file.b");
>   gtk_progress_bar_set_fraction(GTK_PROGRESS_BAR(pb1), 0.6);  ...
>
> and so on.
>
> The result was that the program first executed the system calls, and 
> only afterwards did it paint something or tampered with the progress bar.
>
> Why? How to go around this? What to read?
>
> Thank you,
> Fireel
>
>
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