我正在制作GTK3应用程序,并在GtkListBoxRow上使用g_object_set_qdata
进行搜索。
我使用以下代码:
GArray *complib;
#define row_get_entry(row) (ElcCompLibEntry*)g_object_get_qdata(G_OBJECT(row),registryquark)
GtkWidget* elc_registry_listbox_make_item(ElcCompLibEntry* curritem)
{
/* I remove UI creation */
GtkWidget* intermediate = gtk_list_box_row_new();
gtk_container_add(GTK_CONTAINER(intermediate),GTK_WIDGET(mainbox));
gtk_widget_show_all(GTK_WIDGET(intermediate));
g_object_set_qdata(G_OBJECT(intermediate),registryquark,curritem);
return intermediate;
};
static GtkWidget* saved = NULL;
GtkWidget* new=elc_registry_listbox_make_item(entry);
gtk_container_add(GTK_CONTAINER(listbox->real_listbox),new);
if (saved)
g_debug("saved entry is at position %d",((gintptr)row_get_entry(saved)-(gintptr)complib->data)/sizeof(ElcCompLibEntry));
saved=new;
g_debug("entry is at position %d",((gintptr)row_get_entry(new)-(gintptr)complib->data)/sizeof(ElcCompLibEntry));
我的程序的输出:
** (elc:9906): DEBUG: 18:51:10.623: entry is at position 0
** (elc:9906): DEBUG: 18:51:10.625: saved entry is at position -14015
** (elc:9906): DEBUG: 18:51:10.625: entry is at position 1
** (elc:9906): DEBUG: 18:51:10.627: saved entry is at position 32
** (elc:9906): DEBUG: 18:51:10.627: entry is at position 2
** (elc:9906): DEBUG: 18:51:10.629: saved entry is at position 2
** (elc:9906): DEBUG: 18:51:10.629: entry is at position 3
** (elc:9906): DEBUG: 18:51:10.631: saved entry is at position 25921
** (elc:9906): DEBUG: 18:51:10.631: entry is at position 4
ElcCompLibEntry
是一个简单的结构。
g_object_set_qdata_full
只是在破坏较旧的数据,对夸克进行了初始化,即使在主线程中运行时,我也得到了相同的结果(只有saved entry is at position 2
是恒定的)。
有人可以帮助找到问题的根源和/或将我发送给相关文档吗?
谢谢您的时间!
答案 0 :(得分:0)
每https://developer.gnome.org/glib/stable/glib-Arrays.html#GArray,
当元素添加到GArray时,数据可能会移动。
很难看到没有创建并附加到complib
的代码,但是complib->data
不是常数,并且在调整数组大小时,存储在qdata中的指针可能会失效。
为防止这种情况,请尝试使用g_array_sized_new()
创建数组,以预先分配所需的元素数。