从 GtkListStore 检索数据
Retrieving data from GtkListStore
我在 Glade 中创建了一个带有树视图的 GUI。这是 XML 文件:
<?xml version="1.0" encoding="UTF-8"?>
<interface>
<requires lib="gtk+" version="2.24"/>
<!-- interface-naming-policy project-wide -->
<object class="GtkListStore" id="liststore1">
<columns>
<!-- column-name column1 -->
<column type="gchararray"/>
</columns>
</object>
<object class="GtkWindow" id="window1">
<property name="can_focus">False</property>
<child>
<object class="GtkTreeView" id="treeview1">
<property name="visible">True</property>
<property name="can_focus">True</property>
<property name="model">liststore1</property>
</object>
</child>
</object>
</interface>
我正在尝试在列表中设置一些数据并使用以下方法检索它
代码:
#include <gtk/gtk.h>
int main(int argc, char * argv[]) {
GtkBuilder* gtkBuilder = gtk_builder_new();
GtkWidget* mainwin;
gtk_init(&argc, &argv);
gtk_builder_add_from_file(gtkBuilder, "test.glade", NULL);
mainwin = GTK_WIDGET(gtk_builder_get_object(gtkBuilder, "window1"));
// set treeview data
GtkTreeView *treeview = NULL;
GtkTreeModel *model = NULL;
GtkListStore *liststore = NULL;
GtkTreeIter iter;
gchar* data = "Hello World";
gchar* item = NULL;
treeview = GTK_TREE_VIEW(gtk_builder_get_object(gtkBuilder, "treeview1"));
model = gtk_tree_view_get_model(treeview);
liststore = GTK_LIST_STORE(model);
gtk_list_store_append(liststore, &iter);
gtk_list_store_set(liststore, &iter, 0, data, -1);
gtk_tree_model_get(model, &iter, 0, item, -1);
printf("item: %s\n", item);
g_object_unref(G_OBJECT(gtkBuilder));
g_signal_connect(mainwin, "destroy", G_CALLBACK(gtk_main_quit), NULL);
gtk_widget_show(mainwin);
gtk_main();
}
但是,数据既没有显示在树视图中,也无法检索之前插入的数据。我不知道数据是否正确插入列表 and/or 如果我只是想以错误的方式接收它。
来自 gtk_tree_model_get () 文档:
Gets the value of one or more cells in the row referenced by iter .
The variable argument list should contain integer column numbers, each
column number followed by a place to store the value being retrieved.
The list is terminated by a -1. For example, to get a value from
column 0 with type G_TYPE_STRING, you would write: gtk_tree_model_get
(model, iter, 0, &place_string_here, -1), where place_string_here is a
gchararray to be filled with the string.
因此,您应该更改代码:
gtk_tree_model_get(model, &iter, 0, item, -1);
收件人:
gtk_tree_model_get(model, &iter, 0, &item, -1);
另请注意:
Returned values with type G_TYPE_OBJECT have to be unreferenced,
values with type G_TYPE_STRING or G_TYPE_BOXED have to be freed. Other
values are passed by value.
因此,您需要释放 item
,例如g_free (item);
,使用后。
编辑:
树视图没有 TreeViewColumn,也没有 CellRendererText。
我已将这些添加到您的空地文件中:
<?xml version="1.0" encoding="UTF-8"?>
<!-- Generated with glade 3.19.0 -->
<interface>
<requires lib="gtk+" version="3.0"/>
<object class="GtkListStore" id="liststore1">
<columns>
<!-- column-name column1 -->
<column type="gchararray"/>
</columns>
</object>
<object class="GtkWindow" id="window1">
<property name="can_focus">False</property>
<child>
<object class="GtkTreeView" id="treeview1">
<property name="visible">True</property>
<property name="can_focus">True</property>
<property name="model">liststore1</property>
<child internal-child="selection">
<object class="GtkTreeSelection" id="treeview-selection1"/>
</child>
<child>
<object class="GtkTreeViewColumn" id="treeviewcolumn1">
<property name="title" translatable="yes">column</property>
<child>
<object class="GtkCellRendererText" id="cellrenderertext1">
<property name="height">40</property>
</object>
<attributes>
<attribute name="text">0</attribute>
</attributes>
</child>
</object>
</child>
</object>
</child>
</object>
</interface>
它现在应该可以工作了:
我在 Glade 中创建了一个带有树视图的 GUI。这是 XML 文件:
<?xml version="1.0" encoding="UTF-8"?>
<interface>
<requires lib="gtk+" version="2.24"/>
<!-- interface-naming-policy project-wide -->
<object class="GtkListStore" id="liststore1">
<columns>
<!-- column-name column1 -->
<column type="gchararray"/>
</columns>
</object>
<object class="GtkWindow" id="window1">
<property name="can_focus">False</property>
<child>
<object class="GtkTreeView" id="treeview1">
<property name="visible">True</property>
<property name="can_focus">True</property>
<property name="model">liststore1</property>
</object>
</child>
</object>
</interface>
我正在尝试在列表中设置一些数据并使用以下方法检索它 代码:
#include <gtk/gtk.h>
int main(int argc, char * argv[]) {
GtkBuilder* gtkBuilder = gtk_builder_new();
GtkWidget* mainwin;
gtk_init(&argc, &argv);
gtk_builder_add_from_file(gtkBuilder, "test.glade", NULL);
mainwin = GTK_WIDGET(gtk_builder_get_object(gtkBuilder, "window1"));
// set treeview data
GtkTreeView *treeview = NULL;
GtkTreeModel *model = NULL;
GtkListStore *liststore = NULL;
GtkTreeIter iter;
gchar* data = "Hello World";
gchar* item = NULL;
treeview = GTK_TREE_VIEW(gtk_builder_get_object(gtkBuilder, "treeview1"));
model = gtk_tree_view_get_model(treeview);
liststore = GTK_LIST_STORE(model);
gtk_list_store_append(liststore, &iter);
gtk_list_store_set(liststore, &iter, 0, data, -1);
gtk_tree_model_get(model, &iter, 0, item, -1);
printf("item: %s\n", item);
g_object_unref(G_OBJECT(gtkBuilder));
g_signal_connect(mainwin, "destroy", G_CALLBACK(gtk_main_quit), NULL);
gtk_widget_show(mainwin);
gtk_main();
}
但是,数据既没有显示在树视图中,也无法检索之前插入的数据。我不知道数据是否正确插入列表 and/or 如果我只是想以错误的方式接收它。
来自 gtk_tree_model_get () 文档:
Gets the value of one or more cells in the row referenced by iter . The variable argument list should contain integer column numbers, each column number followed by a place to store the value being retrieved. The list is terminated by a -1. For example, to get a value from column 0 with type G_TYPE_STRING, you would write: gtk_tree_model_get (model, iter, 0, &place_string_here, -1), where place_string_here is a gchararray to be filled with the string.
因此,您应该更改代码:
gtk_tree_model_get(model, &iter, 0, item, -1);
收件人:
gtk_tree_model_get(model, &iter, 0, &item, -1);
另请注意:
Returned values with type G_TYPE_OBJECT have to be unreferenced, values with type G_TYPE_STRING or G_TYPE_BOXED have to be freed. Other values are passed by value.
因此,您需要释放 item
,例如g_free (item);
,使用后。
编辑:
树视图没有 TreeViewColumn,也没有 CellRendererText。
我已将这些添加到您的空地文件中:
<?xml version="1.0" encoding="UTF-8"?>
<!-- Generated with glade 3.19.0 -->
<interface>
<requires lib="gtk+" version="3.0"/>
<object class="GtkListStore" id="liststore1">
<columns>
<!-- column-name column1 -->
<column type="gchararray"/>
</columns>
</object>
<object class="GtkWindow" id="window1">
<property name="can_focus">False</property>
<child>
<object class="GtkTreeView" id="treeview1">
<property name="visible">True</property>
<property name="can_focus">True</property>
<property name="model">liststore1</property>
<child internal-child="selection">
<object class="GtkTreeSelection" id="treeview-selection1"/>
</child>
<child>
<object class="GtkTreeViewColumn" id="treeviewcolumn1">
<property name="title" translatable="yes">column</property>
<child>
<object class="GtkCellRendererText" id="cellrenderertext1">
<property name="height">40</property>
</object>
<attributes>
<attribute name="text">0</attribute>
</attributes>
</child>
</object>
</child>
</object>
</child>
</object>
</interface>
它现在应该可以工作了: