Gtk 组合框函数缺少参数和表达式

Question

我正在尝试在 GTK 2+ 中做一个下拉菜单，我得出的结论是它们被称为“gtk_combo_box”。但是，每当我尝试编译时，它都会在函数错误中给我缺少参数...

这是重要的代码部分：

  vbox3_field = gtk_vbox_new (FALSE, 0);
  gtk_container_add (GTK_CONTAINER (hbox2), vbox3_field);
  gtk_box_pack_start (GTK_BOX (hbox2), vbox3_field, FALSE, TRUE, 0);

  vbox3_sett = gtk_vbox_new (FALSE, 0);
  gtk_container_add (GTK_CONTAINER (hbox2), vbox3_sett);

  ball_menu=gtk_combo_box_text_new ();
  gtk_combo_box_text_append_text (GtkComboBoxText ball_menu, "1");
  gtk_combo_box_text_append_text (GtkComboBoxText ball_menu, "2");
  gtk_combo_box_set_active (GtkComboBox *combo_box, 0);
  //g_signal_connect (ball_menu, "changed", G_CALLBACK (cb_ball_selection), gtk_combo_box_text_get_active_text ());
gtk_box_pack_start(GTK_BOX (vbox3_sett), ball_menu);

当我尝试从函数参数中取出“GtkComboBoxText”时，它仍然给我一个警告说指针类型不兼容。 （我将“ball_menu”声明为 GtkWidget *ball_menu）。

该函数在 GTK 2+ 参考站点中定义如下：

void
gtk_combo_box_text_append_text (GtkComboBoxText *combo_box,
                                const gchar *text);

编译结果如下：

gcc -o main main.c `pkg-config --cflags --libs gtk+-2.0` -lm
main.c: In function ‘main’:
main.c:265:35: error: expected expression before ‘GtkComboBox’
   gtk_combo_box_text_append_text (GtkComboBoxText ball_menu, "1");
                                   ^
main.c:265:35: error: too few arguments to function ‘gtk_combo_box_text_append_text’
In file included from /usr/include/gtk-2.0/gtk/gtk.h:74:0,
                 from main.c:1:
/usr/include/gtk-2.0/gtk/gtkcomboboxtext.h:63:15: note: declared here
 void          gtk_combo_box_text_append_text     (GtkComboBoxText     *combo_box,
               ^
main.c:266:35: error: expected expression before ‘GtkComboBoxText’
   gtk_combo_box_text_append_text (GtkComboBoxText ball_menu, "2");
                                   ^
main.c:266:35: error: too few arguments to function ‘gtk_combo_box_text_append_text’
In file included from /usr/include/gtk-2.0/gtk/gtk.h:74:0,
                 from main.c:1:
/usr/include/gtk-2.0/gtk/gtkcomboboxtext.h:63:15: note: declared here
 void          gtk_combo_box_text_append_text     (GtkComboBoxText     *combo_box,
               ^
main.c:267:29: error: expected expression before ‘GtkComboBox’
   gtk_combo_box_set_active (GtkComboBox *combo_box, 0);
                             ^
main.c:267:29: error: too few arguments to function ‘gtk_combo_box_set_active’
In file included from /usr/include/gtk-2.0/gtk/gtk.h:72:0,
                 from main.c:1:
/usr/include/gtk-2.0/gtk/gtkcombobox.h:101:15: note: declared here
 void          gtk_combo_box_set_active       (GtkComboBox     *combo_box,
               ^

有人知道发生这种情况的原因吗？

Answer 1

gtk_combo_box_text_append_text (GtkComboBoxText ball_menu, "1");

没有有效的转换/转换，更改为

gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT(ball_menu), "1");