单击 GtkButton 时出现分段错误
segmentation fault on clicking a GtkButton
根据我程序中 init_prog(user) 调用的位置，我遇到了分段错误，我不明白原因。如果我在单击 btn_go 后将调用放在 start() 回调函数中，它会崩溃：
Thread 1 "./a.out" received signal SIGSEGV, Segmentation fault.
0x00007ffff7812526 in gdk_window_get_display (window=0x55555555b1c0) at ../../../../gdk/gdkwindow.c:2303
2303 ../../../../gdk/gdkwindow.c: No such file or directory.
这是回溯：
Thread 1 "./a.out" received signal SIGSEGV, Segmentation fault.
0x00007ffff7812526 in gdk_window_get_display (window=0x55555555b1c0) at ../../../../gdk/gdkwindow.c:2303
2303 ../../../../gdk/gdkwindow.c: No such file or directory.
(gdb) bt
#0 0x00007ffff7812526 in gdk_window_get_display (window=0x55555555b1c0) at ../../../../gdk/gdkwindow.c:2303
#1 0x00007ffff78022ce in event_get_display (event=0x7fffe800add0) at ../../../../gdk/gdkevents.c:457
#2 0x00007ffff78022ce in gdk_event_free (event=0x7fffe800add0) at ../../../../gdk/gdkevents.c:839
#3 0x00007ffff783311a in gdk_event_source_dispatch
(source=<optimized out>, callback=<optimized out>, user_data=<optimized out>)
at ../../../../../gdk/x11/gdkeventsource.c:369
#4 0x00007ffff730cf2e in g_main_context_dispatch () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5 0x00007ffff730d1c8 in () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6 0x00007ffff730d4c2 in g_main_loop_run () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#7 0x00007ffff7affb15 in gtk_main () at ../../../../gtk/gtkmain.c:1323
#8 0x0000555555556da1 in create_window () at gui.c:118
#9 0x000055555555644d in main (argc=1, argv=0x7fffffffe328) at main.c:26
这是代码：
#include <glib.h>
#include <stdio.h>
#include <gtk/gtk.h>
void start (GtkWidget *widget, struct prog_data *user);
void create_window() {
GtkWidget *window;
GtkWidget *headbar;
GtkWidget *vbox;
GtkWidget *hbox_superself;
GtkWidget *hbox_my_struct;
GtkWidget *hbox_self;
GtkWidget *btn_about;
GtkWidget *btn_go;
GtkWidget *evnt_box[3];
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
headbar = gtk_header_bar_new();
btn_about = gtk_button_new_with_label("About");
btn_go = gtk_button_new_with_label("Start");
evnt_box[0] = gtk_evnt_box_new ();
evnt_box[1] = gtk_evnt_box_new ();
evnt_box[2] = gtk_evnt_box_new ();
vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
hbox_superself = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 35);
hbox_my_struct = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
hbox_self = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 35);
my_struct.label_user[USR0] = gtk_label_new ("0");
my_struct.label_user[USR1] = gtk_label_new ("0");
my_struct.lbl_pings_left = gtk_label_new ("");
my_struct.img_show[0] = gtk_image_new ();
my_struct.img_show[1] = gtk_image_new ();
my_struct.image_deck_pile = gtk_image_new_from_file ("1.png");
my_struct.self_image[0] = gtk_image_new_from_file ("2.png");
my_struct.self_image[1] = gtk_image_new_from_file ("2.png");
my_struct.self_image[2] = gtk_image_new_from_file ("2.png");
my_struct.image_orca = gtk_image_new ();
my_struct.super_self[0] = gtk_image_new();
my_struct.super_self[1] = gtk_image_new();
my_struct.super_self[2] = gtk_image_new();
gtk_header_bar_set_title (GTK_HEADER_BAR (headbar), "Orca");
gtk_window_set_title (GTK_WINDOW (window), "Orca");
gtk_window_set_titlebar (GTK_WINDOW (window), headbar);
gtk_header_bar_set_show_close_button (GTK_HEADER_BAR (headbar), TRUE);
gtk_window_maximize (GTK_WINDOW (window));
GtkCssProvider *css_provider = gtk_css_provider_new();
gtk_css_provider_load_from_path (css_provider, "style.css", NULL);
GdkScreen *myScreen = gdk_screen_get_default();
gtk_style_context_add_provider_for_screen (myScreen, GTK_STYLE_PROVIDER (css_provider), GTK_STYLE_PROVIDER_PRIORITY_USER);
struct prog_data user[2];
gtk_container_add(GTK_CONTAINER (headbar), btn_about);
gtk_container_add(GTK_CONTAINER (window), vbox);
gtk_container_add(GTK_CONTAINER (vbox), hbox_superself);
gtk_container_add(GTK_CONTAINER (vbox), hbox_my_struct);
gtk_container_add(GTK_CONTAINER (vbox), hbox_self);
gtk_container_add(GTK_CONTAINER (hbox_superself), my_struct.self_image[0]);
gtk_container_add(GTK_CONTAINER (hbox_superself), my_struct.self_image[1]);
gtk_container_add(GTK_CONTAINER (hbox_superself), my_struct.self_image[2]);
gtk_container_add(GTK_CONTAINER (hbox_superself), my_struct.label_user[USR1]);
gtk_container_add(GTK_CONTAINER (hbox_my_struct), my_struct.image_orca);
gtk_container_add(GTK_CONTAINER (hbox_my_struct), my_struct.image_deck_pile);
gtk_container_add(GTK_CONTAINER (hbox_my_struct), my_struct.lbl_pings_left);
gtk_container_add(GTK_CONTAINER (hbox_my_struct), btn_go);
gtk_container_add(GTK_CONTAINER (hbox_my_struct), my_struct.img_show[0]);
gtk_container_add(GTK_CONTAINER (hbox_my_struct), my_struct.img_show[1]);
gtk_container_add(GTK_CONTAINER (hbox_self), evnt_box[0]);
gtk_container_add(GTK_CONTAINER (hbox_self), evnt_box[1]);
gtk_container_add(GTK_CONTAINER (hbox_self), evnt_box[2]);
gtk_container_add(GTK_CONTAINER (evnt_box[0]), my_struct.super_self[0]);
gtk_container_add(GTK_CONTAINER (evnt_box[1]), my_struct.super_self[1]);
gtk_container_add(GTK_CONTAINER (evnt_box[2]), my_struct.super_self[2]);
gtk_container_add(GTK_CONTAINER (hbox_self), my_struct.label_user[USR0]);
GtkStyleContext *context1;
context1 = gtk_widget_get_style_context(hbox_self);
gtk_style_context_add_class(context1, "my_hbox_self");
GtkStyleContext *context2;
context2 = gtk_widget_get_style_context(hbox_superself);
gtk_style_context_add_class(context2, "my_hbox_superself");
GtkStyleContext *context3;
context3 = gtk_widget_get_style_context(hbox_my_struct);
gtk_style_context_add_class(context3, "my_hbox_my_struct");
gtk_widget_set_name (my_struct.img_show[0], "user1");
g_signal_connect (btn_about, "clicked", G_CALLBACK (activate_about), NULL);
g_signal_connect (G_OBJECT (evnt_box[0]), "button_press_event", G_CALLBACK (ping1_clicked), user);
g_signal_connect (G_OBJECT (evnt_box[1]), "button_press_event", G_CALLBACK (ping2_clicked), user);
g_signal_connect (G_OBJECT (evnt_box[2]), "button_press_event", G_CALLBACK (ping3_clicked), user);
g_signal_connect (G_OBJECT (btn_go), "button_press_event", G_CALLBACK (start), user);
g_signal_connect (G_OBJECT (window), "destroy", G_CALLBACK (destroy), NULL);
gtk_widget_show_all (window);
gtk_main();
}
void start (GtkWidget *btn_go, struct prog_data *user) {
gtk_widget_hide(btn_go);
printf("Right\n");
init_prog(user);
}
如果我在 create_window() 函数中将调用 init_prog(user) 移动到 gtk_widget_show_all (window); 之后，我不会遇到任何崩溃。我单独测试了 init_prot(user) 函数，它运行良好。
您通过提供不正确的回调函数来欺骗 GTK。
The manual 告诉我们您的回调在 "button_press_event":
中的样子
gboolean
user_function (GtkWidget *widget,
GdkEvent *event,
gpointer user_data)
您访问 event 指针并将其视为 user_data 指针。这会导致未定义的行为。
您也未能提供强制布尔值 return 值。
您必须调整回调函数的签名以满足要求。
或者您可能会改为使用按钮小部件的 "clicked" 或 "pressed" 事件，而不是 "button-pressed-event"。
您还应检查问题中未出现的其他回调函数是否存在相同错误。
根据我程序中 init_prog(user) 调用的位置，我遇到了分段错误，我不明白原因。如果我在单击 btn_go 后将调用放在 start() 回调函数中，它会崩溃：
Thread 1 "./a.out" received signal SIGSEGV, Segmentation fault.
0x00007ffff7812526 in gdk_window_get_display (window=0x55555555b1c0) at ../../../../gdk/gdkwindow.c:2303
2303 ../../../../gdk/gdkwindow.c: No such file or directory.
这是回溯：
Thread 1 "./a.out" received signal SIGSEGV, Segmentation fault.
0x00007ffff7812526 in gdk_window_get_display (window=0x55555555b1c0) at ../../../../gdk/gdkwindow.c:2303
2303 ../../../../gdk/gdkwindow.c: No such file or directory.
(gdb) bt
#0 0x00007ffff7812526 in gdk_window_get_display (window=0x55555555b1c0) at ../../../../gdk/gdkwindow.c:2303
#1 0x00007ffff78022ce in event_get_display (event=0x7fffe800add0) at ../../../../gdk/gdkevents.c:457
#2 0x00007ffff78022ce in gdk_event_free (event=0x7fffe800add0) at ../../../../gdk/gdkevents.c:839
#3 0x00007ffff783311a in gdk_event_source_dispatch
(source=<optimized out>, callback=<optimized out>, user_data=<optimized out>)
at ../../../../../gdk/x11/gdkeventsource.c:369
#4 0x00007ffff730cf2e in g_main_context_dispatch () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5 0x00007ffff730d1c8 in () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6 0x00007ffff730d4c2 in g_main_loop_run () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#7 0x00007ffff7affb15 in gtk_main () at ../../../../gtk/gtkmain.c:1323
#8 0x0000555555556da1 in create_window () at gui.c:118
#9 0x000055555555644d in main (argc=1, argv=0x7fffffffe328) at main.c:26
这是代码：
#include <glib.h>
#include <stdio.h>
#include <gtk/gtk.h>
void start (GtkWidget *widget, struct prog_data *user);
void create_window() {
GtkWidget *window;
GtkWidget *headbar;
GtkWidget *vbox;
GtkWidget *hbox_superself;
GtkWidget *hbox_my_struct;
GtkWidget *hbox_self;
GtkWidget *btn_about;
GtkWidget *btn_go;
GtkWidget *evnt_box[3];
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
headbar = gtk_header_bar_new();
btn_about = gtk_button_new_with_label("About");
btn_go = gtk_button_new_with_label("Start");
evnt_box[0] = gtk_evnt_box_new ();
evnt_box[1] = gtk_evnt_box_new ();
evnt_box[2] = gtk_evnt_box_new ();
vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
hbox_superself = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 35);
hbox_my_struct = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
hbox_self = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 35);
my_struct.label_user[USR0] = gtk_label_new ("0");
my_struct.label_user[USR1] = gtk_label_new ("0");
my_struct.lbl_pings_left = gtk_label_new ("");
my_struct.img_show[0] = gtk_image_new ();
my_struct.img_show[1] = gtk_image_new ();
my_struct.image_deck_pile = gtk_image_new_from_file ("1.png");
my_struct.self_image[0] = gtk_image_new_from_file ("2.png");
my_struct.self_image[1] = gtk_image_new_from_file ("2.png");
my_struct.self_image[2] = gtk_image_new_from_file ("2.png");
my_struct.image_orca = gtk_image_new ();
my_struct.super_self[0] = gtk_image_new();
my_struct.super_self[1] = gtk_image_new();
my_struct.super_self[2] = gtk_image_new();
gtk_header_bar_set_title (GTK_HEADER_BAR (headbar), "Orca");
gtk_window_set_title (GTK_WINDOW (window), "Orca");
gtk_window_set_titlebar (GTK_WINDOW (window), headbar);
gtk_header_bar_set_show_close_button (GTK_HEADER_BAR (headbar), TRUE);
gtk_window_maximize (GTK_WINDOW (window));
GtkCssProvider *css_provider = gtk_css_provider_new();
gtk_css_provider_load_from_path (css_provider, "style.css", NULL);
GdkScreen *myScreen = gdk_screen_get_default();
gtk_style_context_add_provider_for_screen (myScreen, GTK_STYLE_PROVIDER (css_provider), GTK_STYLE_PROVIDER_PRIORITY_USER);
struct prog_data user[2];
gtk_container_add(GTK_CONTAINER (headbar), btn_about);
gtk_container_add(GTK_CONTAINER (window), vbox);
gtk_container_add(GTK_CONTAINER (vbox), hbox_superself);
gtk_container_add(GTK_CONTAINER (vbox), hbox_my_struct);
gtk_container_add(GTK_CONTAINER (vbox), hbox_self);
gtk_container_add(GTK_CONTAINER (hbox_superself), my_struct.self_image[0]);
gtk_container_add(GTK_CONTAINER (hbox_superself), my_struct.self_image[1]);
gtk_container_add(GTK_CONTAINER (hbox_superself), my_struct.self_image[2]);
gtk_container_add(GTK_CONTAINER (hbox_superself), my_struct.label_user[USR1]);
gtk_container_add(GTK_CONTAINER (hbox_my_struct), my_struct.image_orca);
gtk_container_add(GTK_CONTAINER (hbox_my_struct), my_struct.image_deck_pile);
gtk_container_add(GTK_CONTAINER (hbox_my_struct), my_struct.lbl_pings_left);
gtk_container_add(GTK_CONTAINER (hbox_my_struct), btn_go);
gtk_container_add(GTK_CONTAINER (hbox_my_struct), my_struct.img_show[0]);
gtk_container_add(GTK_CONTAINER (hbox_my_struct), my_struct.img_show[1]);
gtk_container_add(GTK_CONTAINER (hbox_self), evnt_box[0]);
gtk_container_add(GTK_CONTAINER (hbox_self), evnt_box[1]);
gtk_container_add(GTK_CONTAINER (hbox_self), evnt_box[2]);
gtk_container_add(GTK_CONTAINER (evnt_box[0]), my_struct.super_self[0]);
gtk_container_add(GTK_CONTAINER (evnt_box[1]), my_struct.super_self[1]);
gtk_container_add(GTK_CONTAINER (evnt_box[2]), my_struct.super_self[2]);
gtk_container_add(GTK_CONTAINER (hbox_self), my_struct.label_user[USR0]);
GtkStyleContext *context1;
context1 = gtk_widget_get_style_context(hbox_self);
gtk_style_context_add_class(context1, "my_hbox_self");
GtkStyleContext *context2;
context2 = gtk_widget_get_style_context(hbox_superself);
gtk_style_context_add_class(context2, "my_hbox_superself");
GtkStyleContext *context3;
context3 = gtk_widget_get_style_context(hbox_my_struct);
gtk_style_context_add_class(context3, "my_hbox_my_struct");
gtk_widget_set_name (my_struct.img_show[0], "user1");
g_signal_connect (btn_about, "clicked", G_CALLBACK (activate_about), NULL);
g_signal_connect (G_OBJECT (evnt_box[0]), "button_press_event", G_CALLBACK (ping1_clicked), user);
g_signal_connect (G_OBJECT (evnt_box[1]), "button_press_event", G_CALLBACK (ping2_clicked), user);
g_signal_connect (G_OBJECT (evnt_box[2]), "button_press_event", G_CALLBACK (ping3_clicked), user);
g_signal_connect (G_OBJECT (btn_go), "button_press_event", G_CALLBACK (start), user);
g_signal_connect (G_OBJECT (window), "destroy", G_CALLBACK (destroy), NULL);
gtk_widget_show_all (window);
gtk_main();
}
void start (GtkWidget *btn_go, struct prog_data *user) {
gtk_widget_hide(btn_go);
printf("Right\n");
init_prog(user);
}
如果我在 create_window() 函数中将调用 init_prog(user) 移动到 gtk_widget_show_all (window); 之后，我不会遇到任何崩溃。我单独测试了 init_prot(user) 函数，它运行良好。
您通过提供不正确的回调函数来欺骗 GTK。
The manual 告诉我们您的回调在 "button_press_event":
gboolean
user_function (GtkWidget *widget,
GdkEvent *event,
gpointer user_data)
您访问 event 指针并将其视为 user_data 指针。这会导致未定义的行为。
您也未能提供强制布尔值 return 值。
您必须调整回调函数的签名以满足要求。
或者您可能会改为使用按钮小部件的 "clicked" 或 "pressed" 事件，而不是 "button-pressed-event"。
您还应检查问题中未出现的其他回调函数是否存在相同错误。