段錯誤在C/GTK + 3程序的標題內定義的

Question

的Structs：

struct info{ 
    gint mode, isSignalActivate; 
    gchar *filename; 
    GtkWidget *pwdEntry, *pwdReEntry, *mainwin, *dialog, *file_dialog; 
}; 
extern struct info s_Info; 

struct hashes{ 
    gchar *filename; 
    GtkWidget *entryMD5, *entryS1, *entryS256, *entryS512, *entryWhir, *entryRMD; 
    GtkWidget *checkMD5, *checkS1, *checkS256, *checkS512, *checkWhir, *checkRMD; 
}; 
extern struct hashes s_HashType; 

和節目的主要部分：

int main(int argc, char **argv){ 
    if(!gcry_check_version(GCRYPT_MIN_VER)){ 
     fputs("libgcrypt min version required: 1.5.0\n", stderr); 
     return -1; 
    } 
    gcry_control(GCRYCTL_INIT_SECMEM, 16384, 0); 
    gcry_control(GCRYCTL_INITIALIZATION_FINISHED, 0); 

    GtkApplication *app; 
    int status; 

    app = gtk_application_new ("org.gtk.polcrypt",G_APPLICATION_FLAGS_NONE); 
    g_signal_connect (app, "startup", G_CALLBACK (startup), NULL); 
    g_signal_connect (app, "activate", G_CALLBACK (activate), NULL); 
    status = g_application_run (G_APPLICATION (app), argc, argv); 
    g_object_unref (app); 
    return status; 
} 

static void startup (GtkApplication *application, gpointer user_data __attribute__ ((unused))) 
{ 
    static const GActionEntry actions[] = { 
    { "about", about }, 
    { "quit", quit } 
    }; 

    GMenu *menu; 

    g_action_map_add_action_entries (G_ACTION_MAP (application), actions, G_N_ELEMENTS (actions), application); 

    menu = g_menu_new(); 
    g_menu_append (menu, "About", "app.about"); 
    g_menu_append (menu, "Quit", "app.quit"); 
    gtk_application_set_app_menu (application, G_MENU_MODEL (menu)); 
    g_object_unref (menu); 
} 

static void activate (GtkApplication *app, gpointer user_data __attribute__ ((unused))) 
{ 
    GtkWidget *butHa, *grid; 
    struct info s_Info; 

    s_Info.mainwin = gtk_application_window_new(app); 
    gtk_window_set_application (GTK_WINDOW (s_Info.mainwin), GTK_APPLICATION (app)); 
    gtk_window_set_position(GTK_WINDOW(s_Info.mainwin), GTK_WIN_POS_CENTER); 
    gtk_window_set_title(GTK_WINDOW(s_Info.mainwin), "PolCrypt"); 
    gtk_window_set_resizable(GTK_WINDOW(s_Info.mainwin), FALSE); 
    gtk_container_set_border_width(GTK_CONTAINER(s_Info.mainwin), 10); 

    butHa = gtk_button_new_with_label("Compute Hash"); 
    g_signal_connect(butHa, "clicked", G_CALLBACK (is_hash), &s_Info); 

    grid = gtk_grid_new(); 
    gtk_container_add(GTK_CONTAINER(s_Info.mainwin), grid); 
    gtk_grid_set_row_homogeneous(GTK_GRID(grid), TRUE); 
    gtk_grid_set_column_homogeneous(GTK_GRID(grid), TRUE); 
    gtk_grid_set_row_spacing(GTK_GRID(grid), 5); 
    gtk_grid_set_column_spacing(GTK_GRID(grid), 5); 

    //numero colonna, numero riga, colonne da occupare, righe da occupare. Colonne e righe sono aggiunte automaticamente 
    gtk_grid_attach(GTK_GRID(grid), butHa, 0, 0, 5, 1); 

    gtk_widget_show_all(s_Info.mainwin); 
} 

static void is_hash(GtkWidget *ignored __attribute__ ((unused)), struct info *s_Info){ 
    s_Info->mode = 3; 
    file_dialog(s_Info); 
} 

static void file_dialog(struct info *s_Info){ 
    s_Info->file_dialog = gtk_file_chooser_dialog_new("Choose File", NULL, GTK_FILE_CHOOSER_ACTION_OPEN, ("_Cancel"), GTK_RESPONSE_CANCEL, ("_Ok"), GTK_RESPONSE_ACCEPT, NULL); 
    if (gtk_dialog_run (GTK_DIALOG (s_Info->file_dialog)) == GTK_RESPONSE_ACCEPT){ 
     s_Info->filename = gtk_file_chooser_get_filename (GTK_FILE_CHOOSER (s_Info->file_dialog)); 
     if(s_Info->mode == 3){ 
      select_hash_type(s_Info); 
      g_free (s_Info->filename); 
     } 
    } 
    gtk_widget_destroy (s_Info->file_dialog); 
} 

static void select_hash_type(struct info *s_InfoHash){ 
    gtk_widget_hide(GTK_WIDGET(s_InfoHash->file_dialog)); 
    struct hashes s_HashType; 
    GtkWidget *content_area, *grid2; 
    s_InfoHash->dialog = gtk_dialog_new_with_buttons ("Select Hash", NULL, GTK_DIALOG_MODAL | GTK_DIALOG_DESTROY_WITH_PARENT, "_Quit", GTK_RESPONSE_CLOSE, NULL); 
    content_area = gtk_dialog_get_content_area (GTK_DIALOG (s_InfoHash->dialog)); 

    s_HashType.checkMD5 = gtk_check_button_new_with_label("MD5"); 

    s_HashType.entryMD5 = gtk_entry_new(); 

    gtk_editable_set_editable(GTK_EDITABLE(s_HashType.entryMD5), FALSE); 

    gtk_widget_set_size_request(s_InfoHash->dialog, 250, 150); // richiedo una grandezza minima 

    grid2 = gtk_grid_new(); 
    gtk_grid_set_row_homogeneous(GTK_GRID(grid2), TRUE); // righe stessa altezza 
    gtk_grid_set_column_homogeneous(GTK_GRID(grid2), TRUE); // colonne stessa larghezza 
    gtk_grid_set_row_spacing(GTK_GRID(grid2), 5); // spazio fra le righe 

    // numero colonna, numero riga, colonne da occupare, righe da occupare 
    gtk_grid_attach(GTK_GRID(grid2), s_HashType.checkMD5, 0, 0, 1, 1); 
    gtk_grid_attach(GTK_GRID(grid2), s_HashType.entryMD5, 2, 0, 6, 1); 

    /* Add the grid, and show everything we've added to the dialog */ 
    gtk_container_add (GTK_CONTAINER (content_area), grid2); 
    gtk_widget_show_all (s_InfoHash->dialog); 

    s_HashType.filename = malloc(strlen(s_InfoHash->filename)+1); 
    strcpy(s_HashType.filename, s_InfoHash->filename); 

    g_signal_connect_swapped(s_HashType.checkMD5, "clicked", G_CALLBACK(compute_md5), &s_HashType); 

    gint result = gtk_dialog_run(GTK_DIALOG(s_InfoHash->dialog)); 
    switch(result){ 
     case GTK_RESPONSE_CLOSE: 
      gtk_widget_destroy(s_InfoHash->dialog); 
      break; 
    } 
    free(s_HashType.filename); 
} 

我的問題是在當點擊該程序段錯誤「退出」按鈕s_InfoHash->dialog。
上面是gdb的輸出。

Program received signal SIGSEGV, Segmentation fault. 
0x00000000009aa4f0 in ??() 
(gdb) where 
#0 0x00000000009aa4f0 in ??() 
#1 0x00000000008f2290 in ??() 
#2 0x00007fffffffd330 in ??() 
#3 0x00000000007e0480 in ??() 
#4 0x0000000000000188 in ??() 
#5 0x0000000040000002 in ??() 
#6 0x00007ffff5afbba9 in g_hash_table_lookup() 
    from /usr/lib64/libglib-2.0.so.0 
#7 0x00007ffff5e17b7f in g_signal_emit_valist() 
    from /usr/lib64/libgobject-2.0.so.0 
#8 0x00007ffff5e1881a in g_signal_emit() from /usr/lib64/libgobject-2.0.so.0 
#9 0x00007ffff76be454 in ??() from /usr/lib64/libgtk-3.so.0 
#10 0x00007ffff75943dc in ??() from /usr/lib64/libgtk-3.so.0 
#11 0x00007ffff7595c2a in gtk_main_do_event() from /usr/lib64/libgtk-3.so.0 
#12 0x00007ffff71ac522 in ??() from /usr/lib64/libgdk-3.so.0 
#13 0x00007ffff5b0bc66 in g_main_context_dispatch() 
    from /usr/lib64/libglib-2.0.so.0 
#14 0x00007ffff5b0bfb8 in ??() from /usr/lib64/libglib-2.0.so.0 
#15 0x00007ffff5b0c05c in g_main_context_iteration() 
    from /usr/lib64/libglib-2.0.so.0 
#16 0x00007ffff60d9eec in g_application_run() from /usr/lib64/libgio-2.0.so.0 
#17 0x0000000000403339 in main (argc=1, argv=0x7fffffffd878) 
    at src/gtk3/main-gui.c:35 

這件事情讓我發瘋了，因爲我無法找到是什麼原因造成的段錯誤...（我知道，GDB說gtk_application_run (#17)但這是什麼意味着什麼？我該如何調試和修復這個東西？）

我使用的GCC 4.8.1和GTK + 3.10

Answer 1

s_Info沒有停止離開activate()後存在，因此當一個信號發出您正在訪問無效的內存塊（以前由s_Info佔領，並指出，你路過&s_Info作爲信號回調的user_data）