c - GTK+2 : My App is Crashing on quit

Question

嗨，我正在编写一个简单文本编辑器，我使用此回调来处理主窗口删除事件

g_signal_connect(G_OBJECT(mainWindow),"delete-event",G_CALLBACK(quit),   (gpointer)textView);

这是我处理此事件的回调函数

    void quit(GtkWidget *wid,GdkEvent  *e,gpointer data)
{
    GtkTextIter iStart,iEnd;
    GtkTextBuffer *buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(textView));
    gtk_text_buffer_get_bounds(buffer,&iStart,&iEnd);
    gchar * text = gtk_text_buffer_get_text(buffer,&iStart,&iEnd,FALSE);
    if(docFile.isSaved == FALSE && strcmp("",text) )  
    {
        GtkWidget * msgDialog;
        msgDialog = gtk_message_dialog_new(NULL,
                                           GTK_DIALOG_MODAL,
                                           GTK_MESSAGE_QUESTION,
                                           GTK_BUTTONS_YES_NO,
                                           "Do you manna save your file ?",
                                           NULL);

        switch (gtk_dialog_run (GTK_DIALOG(msgDialog)))
        {
            case GTK_RESPONSE_YES:
                if(docFile.name == NULL)
                {
                    if(saveAs(textView))
                    {
                        gtk_widget_destroy (msgDialog);
                        gtk_main_quit ();
                    }
                }
                else
                {   
                    save(textView);
                    gtk_widget_destroy (msgDialog);
                    gtk_main_quit ();
                }
                break;
            case GTK_RESPONSE_NO:
                    gtk_widget_destroy (msgDialog);
                    gtk_main_quit ();

        }
    }else{
            gtk_main_quit();
        }
}

但是当我退出窗口时，我在终端中发现了这个

(Black Hole) adil Tux : SimpleEditor 
>>>> ./a.out 
*** Error in `./a.out': free(): invalid pointer: 0x0000000000604570 ***
======= Backtrace: =========
/usr/lib/libc.so.6(+0x7340e)[0x7fefc476a40e]
/usr/lib/libc.so.6(+0x7884e)[0x7fefc476f84e]
/usr/lib/libc.so.6(+0x7900b)[0x7fefc477000b]
./a.out[0x402ad0]
/usr/lib/libc.so.6(__libc_start_main+0xf0)[0x7fefc4717040]
./a.out[0x402069]
======= Memory map: ========
00400000-00404000 r-xp 00000000 08:06 2107681                            /home/adil/Src/SimpleEditor/a.out
00604000-00605000 rw-p 00004000 08:06 2107681                            /home/adil/Src/SimpleEditor/a.out
01a38000-01b83000 rw-p 00000000 00:00 0 
                             [heap]
....

7fefc736b000-7fefc736c000 rw-p 00022000 08:06 920725                     /usr/lib/ld-2.20.so
7fefc736c000-7fefc736d000 rw-p 00000000 00:00 0 
7fff6fd1c000-7fff6fd3d000 rw-p 00000000 00:00 0                          [stack]
7fff6fdfc000-7fff6fdfe000 r-xp 00000000 00:00 0                          [vdso]
7fff6fdfe000-7fff6fe00000 r--p 00000000 00:00 0                          [vvar]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  [vsyscall]
Aborted (core dumped)

并且认为你。

Answer 1

您的delete-event回调签名错误。它应该返回一个 bool 值来表示窗口是否被删除。

gboolean quit (GtkWidget *wid, GdkEvent *e, gpointer user_data)
{
    . . .
    return TRUE;
}

参见https://developer.gnome.org/gtk3/stable/GtkWidget.html#GtkWidget-delete-event了解更多详情