Problem with gtk_print_operation_run()

Zoltan Boszormenyi <zboszor@xxxxxxxxxxx> · Fri, 05 Oct 2012 13:38:56 +0200



    Hi,

    
    I have problems using the printing feature with this GTK 2.x code:

    
    ----8<--------8<--------8<--------8<--------8<----

            GtkPrintOperation *print;

            GtkPrintOperationResult res; 

    
            print = gtk_print_operation_new ();

    
            if (settings != NULL)  

                    gtk_print_operation_set_print_settings (print,
    settings);

    
            g_signal_connect (print, "status-changed", G_CALLBACK
    (print_status_changed), NULL);

            g_signal_connect (print, "begin-print", G_CALLBACK
    (begin_print), NULL);

            g_signal_connect (print, "request-page-setup", G_CALLBACK
    (print_request_page_setup), NULL);

            g_signal_connect (print, "done", G_CALLBACK (print_done),
    NULL);

            g_signal_connect (print, "end-print", G_CALLBACK
    (print_end), NULL);

            g_signal_connect (print, "paginate", G_CALLBACK
    (print_paginate), NULL);

            g_signal_connect (print, "draw-page", G_CALLBACK
    (draw_page), NULL);

    
            gtk_print_operation_set_allow_async(print, FALSE);

            gtk_print_operation_set_job_name(operation, "myprog");

            gtk_print_operation_set_n_pages(operation, n_pages);

            gtk_print_operation_set_use_full_page (operation, TRUE);

            gtk_print_operation_set_unit (operation, GTK_UNIT_POINTS);

    
            res = gtk_print_operation_run (print,
    GTK_PRINT_OPERATION_ACTION_PRINT_DIALOG,

                                                    GTK_WINDOW
    (main_window), NULL);

    
            printf("on_button5_clicked gtk_print_operation_run result:
    %d\n", res);

    ----8<--------8<--------8<--------8<--------8<----

    
    The problem is that my code only receives the "status-changed" event
    twice,

    once with GTK_PRINT_STATUS_INITIAL
      and then with GTK_PRINT_STATUS_PREPARING. At
    this point,

    the printer dialog disappears but my code doesn't receive any other
    printing event

    or the result of gtk_print_operation_run().

    
    I have used

            gtk_print_operation_set_allow_async(print, FALSE);

    since I want the printing to be synchronous, at least up to spooling
    the print job.

    The same happens without gtk_print_operation_set_allow_async(), I
    guess this is

    the default.

    
    The printing events progress further only when I press Ctrl-C in the
    terminal

    from where I started this program. Only then I receive these in
    order:

    - begin-print

    - paginate

    - status-change with status = GTK_PRINT_STATUS_GENERATING_DATA

      - request-page-setup with page_nr 0

    - draw-page with page_nr 0

    - end-print

    - status-change with status = GTK_PRINT_STATUS_SENDING_DATA

    - status-change with status = GTK_PRINT_STATUS_PRINTING

    - done with result = GTK_PRINT_OPERATION_RESULT_APPLY

    
    Do I have to do something special in the status-changed callback to
    drive the

    printing further? I am on Fedora 17/x86_64 if that's interesting.

    
    Thanks in advance,

    Zoltán Böszörményi

    
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