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如何查看GType节点，以及父子关系。
os
posted @ 2013年8月10日 17:08
in GObject
, 1288 阅读
使用glib的gtype/gobject开发的gtk, gstreamer等，都离不开一个gtype, gobject.
Glib使用2个数据结构来保存type:
//1，用指针数组，保存基础类型，即一些父类型
static TypeNode *static_fundamental_type_nodes[(G_TYPE_FUNDAMENTAL_MAX >> G_TYPE_FUNDAMENTAL_SHIFT) + 1] = { NULL, };
//2, 用散列表来保持所有的类型，包括父类型，子类型
static GHashTable *static_type_nodes_ht = NULL;
static_type_nodes_ht = g_hash_table_new (g_direct_hash, g_direct_equal);
它使用指针作为键值
type创建的过程：
如：
如果没有的话，保持在static_fundamental_type_nodes； 如果有父类的话，就保持到父类的子类数组中pnode->children[i] = type; 同时把这个新的type 插入到hash table中： g_hash_table_insert (static_type_nodes_ht, GUINT_TO_POINTER (node->qname), (gpointer) type); |
如果查看type的list, 以及父子关系呢：
参考gobject_query.c
主要是把父子关系清晰的打印出来：
指针数组static_fundamental_type_nodes，存放了无父类的typenode;
所以只要循环这个指针数组，然后对基础typenode, 嵌套循环其子类，就可以了。
/* GObject - GLib Type, Object, Parameter and Signal Library
* Copyright (C) 1998-1999, 2000-2001 Tim Janik and Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <fcntl.h>
#include <glib-object.h>
#include <glib/gprintf.h>
static GType root = G_TYPE_OBJECT;
static void
show_nodes (GType type,
GType sibling,
const gchar *indent)
{
static gchar *indent_inc = NULL;
static guint spacing = 1;
static gboolean recursion = TRUE;
#define O_SPACE " "
#define O_ESPACE ""
#define O_BRANCH "+"
#define O_VLINE "|"
#define O_LLEAF "`"
#define O_KEY_FILL "_"
GType *children;
guint i;
if (!type)
return;
if (!indent_inc)
{
indent_inc = g_new (gchar, strlen (O_SPACE) + 1);
*indent_inc = 0;
strcpy (indent_inc, O_SPACE);
}
children = g_type_children (type, NULL);
if (type != root)
for (i = 0; i < spacing; i++)
fprintf(stderr, "%s%s\n", indent, O_VLINE);
fprintf(stderr, "%s%s%s%s",
indent,
sibling ? O_BRANCH : (type != root ? O_LLEAF : O_SPACE),
O_ESPACE,
g_type_name (type));
for (i = strlen (g_type_name (type)); i <= strlen (indent_inc); i++)
fputs (O_KEY_FILL, stdout);
fputc ('\n', stdout);
if (children && recursion)
{
gchar *new_indent;
GType *child;
if (sibling)
new_indent = g_strconcat (indent, O_VLINE, indent_inc, NULL);
else
new_indent = g_strconcat (indent, O_SPACE, indent_inc, NULL);
for (child = children; *child; child++)
show_nodes (child[0], child[1], new_indent);
g_free (new_indent);
}
g_free (children);
}
void list_type_node_tree(void)
{
gint i;
root = ~0;
for (i = 0; i <= G_TYPE_FUNDAMENTAL_MAX; i += G_TYPE_MAKE_FUNDAMENTAL (1))
{
const gchar *name = g_type_name (i);
if (name)
show_nodes (i, 0, "");
}
}
g_type_init()后的type list, 以及父子关系：
id | `GInterface | `GTypePlugin | `gchar | `guchar | `gboolean | `gint | `guint | `glong | `gulong | `gint64 | `guint64 | `GEnum | `GFlags | `gfloat | `gdouble | `gchararray | `gpointer | `GType | `GBoxed | `GValueArray | `GParam | +GParamChar | +GParamUChar | +GParamBoolean | +GParamInt | +GParamUInt | +GParamLong | +GParamULong | +GParamInt64 | +GParamUInt64 | +GParamUnichar | +GParamEnum | +GParamFlags | +GParamFloat | +GParamDouble | +GParamString | +GParamParam | +GParamBoxed | +GParamPointer | +GParamValueArray | +GParamObject | +GParamOverride | +GParamGType | `GParamVariant | `GObject | `GVariant
gst_init()后 type/gobject list, 以及object的父子关系：
| `void | `GInterface | +GTypePlugin | +GstChildProxy | `GstURIHandler | `gchar | `guchar | `gboolean | `gint | `guint | `glong | `gulong | `gint64 | `guint64 | `GEnum | +GstFormat | +GstPadDirection | +GstBufferListItem | +GstBusSyncReply | +GstClockReturn | +GstClockEntryType | +GstClockType | +GstState | +GstStateChangeReturn | +GstStateChange | +GstCoreError | +GstLibraryError | +GstResourceError | +GstStreamError | +GstEventType | +GstSeekType | +GstQOSType | +GstIndexCertainty | +GstIndexEntryType | +GstIndexLookupMethod | +GstIndexResolverMethod | +GstDebugLevel | +GstDebugColorFlags | +GstIteratorResult | +GstIteratorItem | +GstPadLinkReturn | +GstFlowReturn | +GstActivateMode | +GstPadPresence | +GstPluginError | +GstRank | +GstQueryType | +GstBufferingMode | +GstStreamStatusType | +GstStructureChangeType | +GstTagMergeMode | +GstTagFlag | +GstTaskState | +GstTypeFindProbability | +GstURIType | +GstParseError | +GstSearchMode | +GstProgressType | `GstCapsIntersectMode | `GFlags | +GstObjectFlags | +GstBinFlags | +GstBufferFlag | +GstBufferCopyFlags | +GstBusFlags | +GstCapsFlags | +GstClockFlags | +GstDebugGraphDetails | +GstElementFlags | +GstEventTypeFlags | +GstSeekFlags | +GstAssocFlags | +GstIndexFlags | +GstMessageType | +GstMiniObjectFlags | +GstPadLinkCheck | +GstPadFlags | +GstPadTemplateFlags | +GstPipelineFlags | +GstPluginFlags | +GstPluginDependencyFlags | +GstAllocTraceFlags | `GstParseFlags | `gfloat | `gdouble | `gchararray | `gpointer | `GType | `GBoxed | +GValueArray | +GstCaps | +GstStructure | +GstDate | +GstDateTime | +GDate | +GstBufferListIterator | +GstParseContext | `GError | `GParam | +GParamChar | +GParamUChar | +GParamBoolean | +GParamInt | +GParamUInt | +GParamLong | +GParamULong | +GParamInt64 | +GParamUInt64 | +GParamUnichar | +GParamEnum | +GParamFlags | +GParamFloat | +GParamDouble | +GParamString | +GParamParam | +GParamBoxed | +GParamPointer | +GParamValueArray | +GParamObject | +GParamOverride | +GParamGType | +GParamVariant | `GstParamFraction | `GObject | +GstObject | | | +GstPad | | | +GstPadTemplate | | | +GstPluginFeature | | | | | +GstElementFactory | | | | | +GstTypeFindFactory | | | | | `GstIndexFactory | | | +GstElement | | | | | `GstBin | | | | | `GstPipeline | | | +GstBus | | | +GstTask | | | +GstTaskPool | | | +GstClock | | | +GstPlugin | | | `GstRegistry | `GstSignalObject | `GVariant | `GstMiniObject | +GstQuery | +GstMessage | +GstBuffer | +GstEvent | `GstBufferList | `GstFourcc | `GstIntRange | `GstInt64Range | `GstDoubleRange | `GstFractionRange | `GstValueList | `GstValueArray | `GstFraction
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