Ste*_*nio 10 c gtk gnome shared-libraries nautilus
我正在尝试用C创建一个Nautilus扩展,但只有Python示例和帮助.
几乎没有文档和字面上没有例子,但只是一些完整的扩展,这些扩展很长,很难为初学者理解.
我只需要一个简单的示例代码,在Nautilus的列表视图中创建一个新列.如何编写和编译它.
我试过的代码是:
#include <libnautilus-extension/nautilus-column-provider.h>
typedef struct _FooExtension FooExtension;
typedef struct _FooExtensionClass FooExtensionClass;
struct _FooExtension
{
GObject parent_slot;
};
struct _FooExtensionClass
{
GObjectClass parent_slot;
};
static void foo_extension_class_init (FooExtensionClass *class);
static void foo_extension_instance_init (FooExtension *img);
static void foo_extension_class_init(FooExtensionClass *class)
{
}
static void foo_extension_instance_init(FooExtension *img)
{
}
static GType provider_types[1];
static GType foo_extension_type;
static void foo_extension_register_type(GTypeModule *module)
{
static const GTypeInfo info = {
sizeof(FooExtensionClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) foo_extension_class_init,
NULL,
NULL,
sizeof (FooExtension),
0,
(GInstanceInitFunc) foo_extension_instance_init,
};
foo_extension_type = g_type_module_register_type(module,
G_TYPE_OBJECT,
"FooExtension",
&info, 0);
/* ... add interfaces ... */
}
GType foo_extension_get_type(void)
{
return foo_extension_type;
}
static GList *foo_extension_get_columns(NautilusColumnProvider *provider)
{
NautilusColumn *column;
GList *ret;
column = nautilus_column_new("FooExtension::foo_data_column", "FooExtension::foo_data", "Foo Data", "Foo Description");
/* _("Foo Data"),
_("Information from the Foo Extension"));*/
ret = g_list_append(NULL, column);
return ret;
}
void nautilus_module_initialize (GTypeModule *module)
{
foo_extension_register_type(module);
provider_types[0] = foo_extension_get_type();
}
void nautilus_module_shutdown(void)
{
/* Any module-specific shutdown */
}
void nautilus_module_list_types (const GType **types, int *num_types)
{
*types = provider_types;
*num_types = G_N_ELEMENTS (provider_types);
}
我用它构建了它:
gcc-c foo_extension.c -o foo_extension.o -fPIC $(pkg-config libnautilus-extension --libs --cflags)
gcc -shared foo_extension.o -o foo_extension.so $(pkg-config libnautilus-extension --libs --cflags)
然后我把它复制到了/usr/lib/nautilus/extensions-2.0/,然后我尝试了nautilus -q但它不起作用.
您还可以从archive.org中的副本检索Nautilus Extension的wiki中指向的文档.archive.org中的副本在C中有示例.
编辑:我添加了一个完整的工作示例,以及代码中缺少部分的解释.
你错过了两件事:
下面你有一个工作的例子.当心NautilusFileInfoProvider是Nautilus异步IO系统的一部分.因此,如果操作很慢,您将阻止Nautilus.在下面的示例中,我只为每个文件设置一个固定的字符串(" Foo ").但是,如果需要收集其他信息,还应该实现参数update_complete和handle以及cancel_update接口.查看archive.org中提供副本的文档
#include <libnautilus-extension/nautilus-column-provider.h>
#include <libnautilus-extension/nautilus-info-provider.h>
typedef struct _FooExtension FooExtension;
typedef struct _FooExtensionClass FooExtensionClass;
typedef struct {
GClosure *update_complete;
NautilusInfoProvider *provider;
NautilusFileInfo *file;
int operation_handle;
gboolean cancelled;
} UpdateHandle;
struct _FooExtension
{
GObject parent_slot;
};
struct _FooExtensionClass
{
GObjectClass parent_slot;
};
static void foo_extension_class_init (FooExtensionClass *class);
static void foo_extension_instance_init (FooExtension *img);
static GList *foo_extension_get_columns (NautilusColumnProvider *provider);
static NautilusOperationResult foo_extension_update_file_info (
NautilusInfoProvider *provider,
NautilusFileInfo *file,
GClosure *update_complete,
NautilusOperationHandle **handle);
/* Interfaces */
static void
foo_extension_column_provider_iface_init (NautilusColumnProviderIface *iface) {
iface->get_columns = foo_extension_get_columns;
return;
}
static void
foo_extension_info_provider_iface_init (NautilusInfoProviderIface *iface) {
iface->update_file_info = foo_extension_update_file_info;
return;
}
/* Extension */
static void foo_extension_class_init(FooExtensionClass *class)
{
}
static void foo_extension_instance_init(FooExtension *img)
{
}
static GType provider_types[1];
static GType foo_extension_type;
static void foo_extension_register_type(GTypeModule *module)
{
static const GTypeInfo info = {
sizeof(FooExtensionClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) foo_extension_class_init,
NULL,
NULL,
sizeof (FooExtension),
0,
(GInstanceInitFunc) foo_extension_instance_init,
};
static const GInterfaceInfo column_provider_iface_info = {
(GInterfaceInitFunc) foo_extension_column_provider_iface_init,
NULL,
NULL
};
static const GInterfaceInfo info_provider_iface_info = {
(GInterfaceInitFunc) foo_extension_info_provider_iface_init,
NULL,
NULL
};
foo_extension_type = g_type_module_register_type(module,
G_TYPE_OBJECT,
"FooExtension",
&info, 0);
/* ... add interfaces ... */
g_type_module_add_interface (module,
foo_extension_type,
NAUTILUS_TYPE_COLUMN_PROVIDER,
&column_provider_iface_info);
g_type_module_add_interface (module,
foo_extension_type,
NAUTILUS_TYPE_INFO_PROVIDER,
&info_provider_iface_info);
}
GType foo_extension_get_type(void)
{
return foo_extension_type;
}
/* Column interfaces */
static GList *foo_extension_get_columns(NautilusColumnProvider *provider)
{
NautilusColumn *column;
GList *ret;
column = nautilus_column_new ("FooExtension::foo_data_column",
"FooExtension::foo_data",
"Foo Data",
"Foo Description");
ret = g_list_append(NULL, column);
return ret;
}
/* Info interfaces */
static NautilusOperationResult
foo_extension_update_file_info (NautilusInfoProvider *provider,
NautilusFileInfo *file,
GClosure *update_complete,
NautilusOperationHandle **handle)
{
char *data;
/* Check if we've previously cached the file info */
data = g_object_get_data (G_OBJECT (file), "foo_extension_data");
/* get and provide the information associated with the column.
If the operation is not fast enough, we should use the arguments
update_complete and handle for asyncrhnous operation. */
if (!data) {
data = g_strdup ("Foo");
}
nautilus_file_info_add_string_attribute (file,
"FooExtension::foo_data",
data);
return NAUTILUS_OPERATION_COMPLETE;
}
/* Extension initialization */
void nautilus_module_initialize (GTypeModule *module)
{
foo_extension_register_type(module);
provider_types[0] = foo_extension_get_type();
}
void nautilus_module_shutdown(void)
{
/* Any module-specific shutdown */
}
void nautilus_module_list_types (const GType **types, int *num_types)
{
*types = provider_types;
*num_types = G_N_ELEMENTS (provider_types);
}
要编译它:
$ gcc -c foo-extension.c -o foo-extension.o -fPIC $(pkg-config libnautilus-extension --cflags)
$ gcc -shared foo-extension.o -o foo-extension.so $(pkg-config libnautilus-extension --libs)
要测试扩展,首先需要停止任何正在运行的nautilus实例并重新启动nautilus.那是:
$ nautilus -q
$ nautilus
请注意,没有使用-q选项,即退出.
如果您想检查Nautilus是否正在加载您的扩展程序,您可以使用strace如下:
$ strace -e trace=open nautilus
并查看Nautilus正在加载/打开的库和文件.
在扩展中工作时,您可以在[libdir] /nautilus/extensions-3.0中复制扩展文件,而不是在工作目录中创建符号链接.如果您使用的是Nautilus 2.x,请改用[libdir] /nautilus/extensions-2.0.