在 c 中初始化 GtkImage

Question

当我尝试使 Gtkwidget 指向我从文件加载 png 的内存地址时，我遇到了分段错误。我想card[6].image显示我在card[0].image中加载的图像，以及我想从card[0].image中删除相同的图像。

struct my_image {
const char *path;
GtkWidget *image;
};
void create_window() {
GtkWidget *window;
GtkWidget *headbar;
GtkWidget *vbox;
GtkWidget *hbox_3;
GtkWidget *hbox_table;
GtkWidget *hbox_1;
GtkWidget *hbox_2;
GtkWidget *about_button;
GtkWidget *event_box1, *event_box2, *event_box3;
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
headbar = gtk_header_bar_new();
about_button = gtk_button_new_with_mnemonic("CLick");
event_box1 = gtk_event_box_new ();
event_box2 = gtk_event_box_new ();
event_box3 = gtk_event_box_new ();
vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 50);   
hbox_3 = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 35);
hbox_table = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 35);
hbox_2= gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
hbox_1 = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 35);   
gtk_header_bar_set_title (GTK_HEADER_BAR (headbar), "Myprogram");
gtk_window_set_title (GTK_WINDOW (window), "Myprogram");    
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));  
card[0].path = pile[0];
card[1].path = pile[1];
card[2].path = pile[2];
card[0].image = gtk_image_new_from_file (card[0].path);
card[1].image = gtk_image_new_from_file (card[1].path);
card[2].image = gtk_image_new_from_file (card[2].path);
card[3].path = "c/fort.png";
card[4].path = "c/fort.png";
card[5].path = "c/fort.png";
card[3].image = gtk_image_new_from_file (card[3].path);
card[4].image = gtk_image_new_from_file (card[4].path);
card[5].image = gtk_image_new_from_file (card[5].path);

card[6].image = gtk_image_new ();
card[7].image = gtk_image_new ();
printf("card 0 address = %un", card[0].image);
printf("card 6 address = %un", card[6].image);     
card[8].path = pile[39];
card[9].path = "c/mazzo.png";
card[8].image = gtk_image_new_from_file (card[8].path);
card[9].image = gtk_image_new_from_file (card[9].path);
g_signal_connect (about_button, "clicked", G_CALLfort (activate_about), NULL);
g_signal_connect (G_OBJECT (event_box1), "button_press_event", G_CALLfort (card1_clicked), card);
g_signal_connect (G_OBJECT (event_box2), "button_press_event", G_CALLfort (card2_clicked), card);
g_signal_connect (G_OBJECT (event_box3), "button_press_event", G_CALLfort (card3_clicked), card);
g_signal_connect (G_OBJECT (window), "destroy", G_CALLfort (destroy), NULL);
gtk_container_add(GTK_CONTAINER (headbar), about_button);
gtk_container_add(GTK_CONTAINER (window), vbox);
gtk_container_add(GTK_CONTAINER (vbox), hbox_3);
gtk_container_add(GTK_CONTAINER (vbox), hbox_table);
gtk_container_add(GTK_CONTAINER (vbox), hbox_2);
gtk_container_add(GTK_CONTAINER (vbox), hbox_1);
gtk_container_add(GTK_CONTAINER (hbox_2), card[8].image);
gtk_container_add(GTK_CONTAINER (hbox_2), card[9].image);
gtk_container_add(GTK_CONTAINER (hbox_1), event_box1);
gtk_container_add(GTK_CONTAINER (hbox_1), event_box2);
gtk_container_add(GTK_CONTAINER (hbox_1), event_box3);
gtk_container_add(GTK_CONTAINER (event_box1), card[0].image);
gtk_container_add(GTK_CONTAINER (event_box2), card[1].image);
gtk_container_add(GTK_CONTAINER (event_box3), card[2].image);
gtk_container_add(GTK_CONTAINER (hbox_3), card[3].image);
gtk_container_add(GTK_CONTAINER (hbox_3), card[4].image);
gtk_container_add(GTK_CONTAINER (hbox_3), card[5].image);
gtk_container_add(GTK_CONTAINER (hbox_table), card[6].image);
gtk_container_add(GTK_CONTAINER (hbox_table), card[7].image);   
gtk_widget_show_all (window);
gtk_main();
}
void card1_clicked (GtkWidget *window, struct my_image *card)
{
printf("%sn", card[0].path);
card[6].image = card[0].image;
/*gtk_image_set_from_file(GTK_IMAGE(card[6].image), card[0].path);*/
}

图像最初显示正确，但当触发此行card1_clciked时card[6].image = card[0].image;产生分割错误。 我不确定我是否正确加载了图像以及如何使用相同的小部件加载另一张图像;我也尝试使用具有相同效果的函数/*gtk_image_set_from_file(GTK_IMAGE(card[6].image), card[0].path);*。

Answer 1

button_press_event信号的回调函数未正确定义。

手册告诉我们它应该是什么样子：

// The “button-press-event” signal
gboolean
user_function (GtkWidget *widget,
GdkEvent  *event,
gpointer   user_data)

在您的函数中，您缺少一个参数：

void card1_clicked (GtkWidget *window, struct my_image *card)

这意味着您正在使用event指针读取card数组，这会导致一些非法的读取访问。

除此之外，您不提供所需的布尔返回值。