Glib::xsapi - internal API reference for GPerl.
#include <gperl.h>
This is the binding developer's API reference for GPerl, automatically generated from the xs source files. This header defines the public interface for use when creating new Perl language bindings for GLib-based C libraries.
gperl.h includes for you all the headers needed for writing XSUBs (EXTERN.h, perl.h, and XSUB.h), as well as all of GLib (via glib-object.h).
Various useful utilities defined in Glib.xs.
call the boot code of a module by symbol rather than by name. in a perl extension which uses several xs files but only one pm, you need to bootstrap the other xs files in order to get their functions exported to perl. if the file has MODULE = Foo::Bar, the boot symbol would be boot_Foo_ _Bar.
never use this function directly. see GPERL_CALL_BOOT.
for the curious, this calls a perl sub by function pointer rather than
by name; call_sv requires that the xsub already be registered, but we
need this to call a function which will register xsubs. this is an evil
hack and should not be used outside of the GPERL_CALL_BOOT macro. it's
implemented as a function to avoid code size bloat, and exported so that
extension modules can pull the same trick.
Allocate and return a pointer to an nbytes-long, zero-initialized, temporary buffer that will be reaped at the next garbage collection sweep. This is handy for allocating things that need to be alloc'ed before a croak (since croak doesn't return and give you the chance to free them). The trick is that the memory is allocated in a mortal perl scalar. See the perl online manual for notes on using this technique. Do not under any circumstances attempt to call g_free(), free(), or any other deallocator on this pointer, or you will crash the interpreter.
Return a localized version of the filename in the sv, using g_filename_from_utf8 (and consequently this function might croak). The memory is allocated using gperl_alloc_temp.
Convert the filename into an utf8 string as used by gtk/glib and perl.
Compare a pair of ascii strings, considering '-' and '_' to be equivalent. Used for things like enum value nicknames and signal names.
Like g_str_hash(), but considers '-' and '_' to be equivalent.
Creates a new Perl argv object whose members can then be passed to
functions that request argc and argv style arguments. If the called
function(s) modified argv, you can call gperl_argv_update to update
Perl's @ARGV in the same way. Remember to call
gperl_argv_free when you're done.
Updates @ARGV to resemble the stored argv array.
Frees any resources associated with pargv.
Formats the variable stored in sv for output in error messages. Like SvPV_nolen(), but ellipsizes real strings (i.e., not stringified references) at 20 chars to trim things down for error messages.
Checks the SV sv for definedness just like Perl's defined() would do. Most importantly, it correctly handles magical SVs, unlike bare SvOK. It's also NULL-safe.
Tries to store sv in hv. Decreases sv's reference count if something goes wrong.
GError is a facility for propagating run-time error / exception information around in C, which is a language without native support for exceptions. GError uses a simple error code, usually defined as an enum. Since the enums will overlap, GError includes the GQuark corresponding to a particular error domain to tell you which error codes will be used. There's also a string containing a specific error message. The strings are arbitrary, and may be translated, but the domains and codes are definite.
Perl has native support for exceptions, using eval as
try, croak or die as throw, and
if ($@) as catch. $@ may, in fact, be any
scalar, including blessed objects.
So, GPerl maps GLib's GError to Perl exceptions.
Since, as we described above, error messages are not guaranteed to be unique everywhere, we need to support the use of the error domains and codes. The obvious choice here is to use exception objects; however, to support blessed exception objects, we must perform a little bit of black magic in the bindings. There is no built-in association between an error domain quark and the GType of the corresponding error code enumeration, so the bindings supply both of these when specifying the name of the package into which to bless exceptions of this domain. All GError-based exceptions derive from Glib::Error, of course, and this base class provides all of the functionality, including stringification.
All you'll really ever need to do is register error domains with
gperl_register_error_domain, and throw errors with
gperl_croak_gerror.
Tell the bindings to bless GErrors with error->domain ==
domain into package, and use error_enum to
find the nicknames for the error codes. This will call
gperl_set_isa on package to add Glib::Error to
package's @ISA. domain may not be 0, and
package may not be NULL; what would be the point?
error_enum may be 0, in which case you'll get no fancy
stringified error values.
You should rarely, if ever, need to call this function. This is what turns a GError into a Perl object.
You should rarely need this function. This parses a perl data
structure into a GError. If sv is undef (or the empty string),
sets *error to NULL, otherwise, allocates a new GError with
g_error_new_literal() and writes through error;
the caller is responsible for calling g_error_free().
(gperl_croak_gerror() does this, for example.)
Croak with an exception based on err. err may not be NULL. ignored exists for backward compatibility, and is, well, ignored. This function calls croak(), which does not return. Since croak() does not return, this function handles the magic behind not leaking the memory associated with the #GError. To use this you'd do something like PREINIT: GError * error = NULL; CODE: if (!funtion_that_can_fail (something, &error)) gperl_croak_gerror (NULL, error); It's just that simple!
GLib has a message logging mechanism which it uses for the g_return_if_fail() assertion macros, etc.; it's really versatile and allows you to set various levels to be fatal and whatnot. Libraries use these for various types of message reporting.
These functions let you reroute those messages from Perl. By default, the warning, critical, and message levels go through perl's warn(), and fatal ones go through croak(). [i'm not sure that these get to croak() before GLib abort()s on them...]
Route all g_logs for log_domain through gperl's log handling. You'll have to register domains in each binding submodule, because there's no way we can know about them down here. And, technically, this traps all the predefined log levels, not any of the ones you (or your library) may define for yourself.
register a mapping between gtype and package. this is for fundamental types which have no other requirements for metadata storage, such as GEnums, GFlags, or real GLib fundamental types like G_TYPE_INT, G_TYPE_FLOAT, etc.
Makes package an alias for type. This means that the package name specified by package will be mapped to type by gperl_fundamental_type_from_package, but gperl_fundamental_package_from_type won't map type to package. This is useful if you want to change the canonical package name of a type while preserving backwards compatibility with code which uses package to specify type. In order for this to make sense, another package name should be registered for type with gperl_register_fundamental or gperl_register_fundamental_full.
Specifies the vtable that is to be used to convert fundamental types to and from Perl variables. typedef struct _GPerlValueWrapperClass GPerlValueWrapperClass; struct _GPerlValueWrapperClass { GPerlValueWrapFunc wrap; GPerlValueUnwrapFunc unwrap; }; The members are function pointers, each of which serves a specific purpose:
Turns value into an SV. The caller assumes ownership of the SV. value is not to be modified. typedef SV* (*GPerlValueWrapFunc) (const GValue * value);
Turns sv into its fundamental representation and stores the
result in the pre-configured value. value must not be
overwritten; instead one of the various g_value_set_*()
functions must be used or the value->data pointer must
be modified directly. typedef void (*GPerlValueUnwrapFunc) (GValue *
value, SV * sv);
Like gperl_register_fundamental, registers a mapping between gtype and package. In addition, this also installs the function pointers in wrapper_class as the handlers for the type. See GPerlValueWrapperClass. gperl_register_fundamental_full does not copy the contents of wrapper_class Ω- it assumes that wrapper_class is statically allocated and that it will be valid for the whole lifetime of the program.
look up the GType corresponding to a package registered by gperl_register_fundamental().
look up the package corresponding to a gtype registered by gperl_register_fundamental().
look up the wrapper class corresponding to a gtype that has previously been registered with gperl_register_fundamental_full().
return FALSE if sv can't be mapped to a valid member of the registered enum type gtype; otherwise, return TRUE write the new value to the int pointed to by val. you'll need this only in esoteric cases.
croak if val is not part of type, otherwise return corresponding value
return a scalar containing the nickname of the enum value val, or the integer value of val if val is not a member of the enum type.
return a scalar which is the nickname of the enum value val, or croak if val is not a member of the enum.
like gperl_try_convert_enum(), but for GFlags.
croak if val is not part of type, otherwise return corresponding value.
collapse a list of strings to an integer with all the correct bits set, croak if anything is invalid.
convert a bitfield to a list of strings.
tell perl that child_package inherits
parent_package, after whatever else is already there.
equivalent to
push @{$parent_package}::ISA, $child_package;
tell perl that child_package inherits
parent_package, but before whatever else is already there.
equivalent to
unshift @{$parent_package}::ISA, $child_package;
Look up the GType associated with package, regardless of how it was registered. Returns 0 if no mapping can be found.
Look up the name of the package associated with gtype, regardless of how it was registered. Returns NULL if no mapping can be found.
In order to allow GValues to hold perl SVs we need a GBoxed wrapper.
Evaluates to the GType for SVs. The bindings register a mapping between GPERL_TYPE_SV and the package 'Glib::Scalar' with gperl_register_boxed().
implemented as newSVsv (sv).
implemented as SvREFCNT_dec (sv).
By convention, gchar* is assumed to point to UTF8 string data, and char* points to ascii string data. Here we define a pair of wrappers for the boilerplate of upgrading Perl strings. They are implemented as functions rather than macros, because comma expressions in macros are not supported by all compilers.
These functions should be used instead of newSVpv and SvPV_nolen in all cases which deal with gchar* types.
extract a UTF8 string from sv.
copy a UTF8 string into a new SV. if str is NULL, returns &PL_sv_undef.
On 32 bit machines and even on some 64 bit machines, perl's IV/UV data type can only hold 32 bit values. The following functions therefore convert 64 bit integers to and from Perl strings if normal IV/UV conversion does not suffice.
Converts the string in sv to a signed 64 bit integer. If
appropriate, uses SvIV instead.
Creates a PV from the signed 64 bit integer in value. If
appropriate, uses newSViv instead.
Converts the string in sv to an unsigned 64 bit integer. If
appropriate, uses SvUV instead.
Creates a PV from the unsigned 64 bit integer in value. If
appropriate, uses newSVuv instead.
Specifies the vtable of functions to be used for bringing boxed types in and out of perl. The structure is defined like this: typedef struct _GPerlBoxedWrapperClass GPerlBoxedWrapperClass; struct _GPerlBoxedWrapperClass { GPerlBoxedWrapFunc wrap; GPerlBoxedUnwrapFunc unwrap; GPerlBoxedDestroyFunc destroy; }; The members are function pointers, each of which serves a specific purpose:
turn a boxed pointer into an SV. gtype is the type of the boxed pointer, and package is the package to which that gtype is registered (the lookup has already been done for you at this point). if own is true, the wrapper is responsible for freeing the object; if it is false, some other code owns the object and you must NOT free it. typedef SV* (*GPerlBoxedWrapFunc) (GType gtype, const char * package, gpointer boxed, gboolean own);
turn an SV into a boxed pointer. like GPerlBoxedWrapFunc, gtype and package are the registered type pair, already looked up for you (in the process of finding the proper wrapper class). sv is the sv to unwrap. typedef gpointer (*GPerlBoxedUnwrapFunc) (GType gtype, const char * package, SV * sv);
this will be called by Glib::Boxed::DESTROY, when the wrapper is destroyed. it is a hook that allows you to destroy an object owned by the wrapper; note, however, that you will have had to keep track yourself of whether the object was to be freed. typedef void (*GPerlBoxedDestroyFunc) (SV * sv);
Register a mapping between the GBoxed derivative gtype and
package. The specified, wrapper_class will be used to
wrap and unwrap objects of this type; you may pass NULL to use the
default wrapper (the same one returned by
gperl_default_boxed_wrapper_class()). In normal usage,
the standard opaque wrapper supplied by the library is sufficient and
correct. In some cases, however, you want a boxed type to map directly
to a native perl type; for example, some struct may be more
appropriately represented as a hash in perl. Since the most necessary
place for this conversion to happen is in
gperl_value_from_sv() and
gperl_sv_from_value(), the only reliable and robust way
to implement this is a hook into
gperl_get_boxed_check() and
gperl_new_boxed(); that is exactly the purpose of
wrapper_class. See GPerlBoxedWrapperClass.
gperl_register_boxed does not copy the contents of
wrapper_class Ω- it assumes that wrapper_class is
statically allocated and that it will be valid for the whole lifetime of
the program.
Makes package an alias for type. This means that the package name specified by package will be mapped to type by gperl_boxed_type_from_package, but gperl_boxed_package_from_type won't map type to package. This is useful if you want to change the canonical package name of a type while preserving backwards compatibility with code which uses package to specify type. In order for this to make sense, another package name should be registered for type with gperl_register_boxed.
Registers synonym_gtype as a synonym for registered_gtype. All boxed objects of type synonym_gtype will then be treated as if they were of type registered_gtype, and gperl_boxed_package_from_type will return the package associated with registered_gtype. registered_gtype must have been registered with gperl_register_boxed already.
Look up the GType associated with package package. Returns 0 if type is not registered.
Look up the package associated with GBoxed derivative type. Returns NULL if type is not registered.
get a pointer to the default wrapper class; handy if you want to use the normal wrapper, with minor modifications. note that you can just pass NULL to gperl_register_boxed(), so you really only need this in fringe cases.
Export a GBoxed derivative to perl, according to whatever GPerlBoxedWrapperClass is registered for gtype. In the default implementation, this means wrapping an opaque perl object around the pointer to a small wrapper structure which stores some metadata, such as whether the boxed structure should be destroyed when the wrapper is destroyed (controlled by own; if the wrapper owns the object, the wrapper is in charge of destroying it's data). This function might end up calling other Perl code, so if you use it in XS code for a generic GType, make sure the stack pointer is set up correctly before the call, and restore it after the call.
Create a new copy of boxed and return an owner wrapper for
it. boxed may not be NULL. See
gperl_new_boxed.
Extract the boxed pointer from a wrapper; croaks if the wrapper sv is not blessed into a derivative of the expected gtype. Does not allow undef.
To deal with the intricate interaction of the different reference-counting semantics of Perl objects versus GObjects, the bindings create a combined PerlObject+GObject, with the GObject's pointer in magic attached to the Perl object, and the Perl object's pointer in the GObject's user data. Thus it's not really a wrapper, but we refer to it as one, because combined Perl object + GObject is a cumbersome and confusing mouthful.
GObjects are represented as blessed hash references. The GObject user data mechanism is not typesafe, and thus is used only for unsigned integer values; the Perl-level hash is available for any type of user data. The combined nature of the wrapper means that data stored in the hash will stick around as long as the object is alive.
Since the C pointer is stored in attached magic, the C pointer is not available to the Perl developer via the hash object, so there's no need to worry about breaking it from perl.
Propers go to Marc Lehmann for dreaming most of this up.
tell the GPerl type subsystem what Perl package corresponds with a
given GObject by GType. automagically sets up @package::ISA for
you. note that @ISA will not be created for gtype until
gtype's parent has been registered. if you are experiencing strange
problems with a class' @ISA not being set up, change the
order in which you register them.
Makes package an alias for type. This means that the package name specified by package will be mapped to type by gperl_object_type_from_package, but gperl_object_package_from_type won't map type to package. This is useful if you want to change the canonical package name of a type while preserving backwards compatibility with code which uses package to specify type. In order for this to make sense, another package name should be registered for type with gperl_register_object.
Tell gperl_new_object() to use func to
claim ownership of objects derived from gtype.
gperl_new_object() always refs a GObject when wrapping
it for the first time. To have the Perl wrapper claim ownership of a
GObject as part of gperl_new_object(), you unref the
object after ref'ing it. however, different GObject subclasses have
different ways to claim ownership; for example, GtkObject simply
requires you to call gtk_object_sink(). To make this
concept generic, this function allows you to register a function to be
called when then wrapper should claim ownership of the object. The
func registered for a given type will be called on any
object for which g_type_isa (G_TYPE_OBJECT (object), type)
succeeds. If no sinkfunc is found for an object,
g_object_unref() will be used. Even though GObjects
don't need sink funcs, we need to have them in Glib as a hook for
upstream objects. If we create a GtkObject (or any other type of object
which uses a different way to claim ownership) via Glib::Object->new,
any upstream wrappers, such as gtk2perl_new_object(),
will not be called. Having a sink func facility down
here enables us always to do the right thing.
In versions 1.00 through 1.10x of Glib, the bindings required all types to be registered ahead of time. Upon encountering an unknown type, the bindings would emit a warning to the effect of unknown type 'Foo'; representing as first known parent type 'Bar'. However, for some types, such as GtkStyle or GdkGC, the actual object returned is an instance of a child type of a private implementation (e.g., a theme engine (BlueCurveStyle) or gdk backend (GdkGCX11)); we neither can nor should have registered names for these types. Therefore, it is possible to tell the bindings not to warn about these unregistered subclasses, and simply represent them as the parent type. With 1.12x, the bindings will automatically register unknown classes into the namespace Glib::Object::_Unregistered to avoid possible breakage resulting from unknown ancestors of known children. To preserve the old registered-as-unregistered behavior, the value installed by this function is used to prevent the _Unregistered mapping for such private backend classes. Note: this assumes gtype has already been registered with gperl_register_object().
Get the package corresponding to gtype. If gtype is
not a GObject or GInterface, returns NULL. If gtype is not
registered to a package name, a new name of the form
Glib::Object::_Unregistered::$c_type_name will be created,
used to register the class, and then returned.
Get the stash corresponding to gtype; returns NULL if
gtype is not registered. The stash is useful for
blessing.
Inverse of gperl_object_package_from_type(), returns 0 if package is not registered.
Use this function to get the perl part of a GObject. If
object has never been seen by perl before, a new, empty perl
object will be created and added to a private key under
object's qdata. If object already has a perl part, a
new reference to it will be created. The gobject + perl object together
form a combined object that is properly refcounted, i.e. both parts will
stay alive as long as at least one of them is alive, and only when both
perl object and gobject are no longer referenced will both be freed. The
perl object will be blessed into the package corresponding to the GType
returned by calling G_OBJECT_TYPE() on object;
if that class has not been registered via
gperl_register_object(), this function will emit a
warning to that effect (with warn()), and attempt to
bless it into the first known class in the object's ancestry. Since
Glib::Object is already registered, you'll get a Glib::Object if you are
lazy, and thus this function can fail only if object isn't
descended from GObject, in which case it croaks. (In reality, if you
pass a non-GObject to this function, you'll be lucky if you don't get a
segfault, as there's not really a way to trap that.) In practice these
warnings can be unavoidable, so you can use
gperl_object_set_no_warn_unreg_subclass() to quell them
on a class-by-class basis. However, when perl code is calling a GObject
constructor (any function which returns a new GObject), call
gperl_new_object() with own set to
%TRUE; this will cause the first matching sink function to
be called on the GObject to claim ownership of that object, so that it
will be destroyed when the perl object goes out of scope. The default
sink func is g_object_unref(); other types should
supply the proper function; e.g., GtkObject should use
gtk_object_sink() here. Returns the blessed perl
object, or #&PL_sv_undef if object was #NULL.
retrieve the GObject pointer from a Perl object. Returns NULL if sv is not linked to a GObject. Note, this one is not safe Ω- in general you want to use gperl_get_object_check().
croaks if sv is undef or is not blessed into the package corresponding to gtype. use this for bringing parameters into xsubs from perl. Returns the same as gperl_get_object() (provided it doesn't croak first).
Essentially the same as gperl_get_object_check(). This croaks if the types aren't compatible.
GValue is GLib's generic value container, and it is because of GValue that the run time type handling of GObject parameters and GClosure marshaling can function, and most usages of these functions will be from those two points.
Client code will run into uses for gperl_sv_from_value() and gperl_value_from_sv() when trying to convert lists of parameters into GValue arrays and the like.
set a value from a whatever is in sv. value must be initialized so the code knows what kind of value to coerce out of sv. Return value is always TRUE; if the code knows how to perform the conversion, it croaks. (The return value is for backward compatibility.) In reality, this really ought to always succeed; a failed conversion should be considered a bug or unimplemented code!
Coerce whatever is in value into a perl scalar and return it. Croaks if the code doesn't know how to perform the conversion. Might end up calling other Perl code. So if you use this function in XS code for a generic GType, make sure the stack pointer is set up correctly before the call, and restore it after the call.
GPerlClosure is a wrapper around the gobject library's GClosure with special handling for marshalling perl subroutines as callbacks. This is specially tuned for use with GSignal and stuff like io watch, timeout, and idle handlers.
For generic callback functions, which need parameters but do not get registered with the type system, this is sometimes overkill. See GPerlCallback, below.
Create and return a new GPerlClosure. callback and data will be copied for storage; callback must not be NULL. If swap is TRUE, data will be swapped with the instance during invocation (this is used to implement g_signal_connect_swapped()). If compiled under a thread-enabled perl, the closure will be created and marshaled in such a way as to ensure that the same interpreter which created the closure will be used to invoke it.
Like gperl_closure_new, but uses a caller-supplied
marshaller. This is provided for use in those sticky circumstances when
you just can't do it any other way; in general, you want to use the
default marshaller, which you get if you provide NULL for
marshaller. If you use you own marshaller, you need to take
care of everything yourself, including swapping the instance and data if
GPERL_CLOSURE_SWAP_DATA (closure) is true, calling
gperl_run_exception_handlers if ERRSV is true after
invoking the perl sub, and ensuring that you properly use the
marshal_data parameter as the perl interpreter when
PERL_IMPLICIT_CONTEXT is defined. See the implementation of the default
marshaller, gperl_closure_marshal, in Glib/GClosure.xs for
inspiration.
generic callback functions usually get invoked directly, and are not passed parameter lists as GValues. we could very easily wrap up such generic callbacks with something that converts the parameters to GValues and then channels everything through GClosure, but this has two problems: 1) the above implementation of GClosure is tuned to marshalling signal handlers, which always have an instance object, and 2) it's more work than is strictly necessary.
additionally, generic callbacks aren't always kind to the GClosure paradigm.
so, here's GPerlCallback, which is designed specifically to run generic callback functions. it reads parameters off the C stack and converts them into parameters on the perl stack. (it uses the GValue to/from SV mechanism to do so, but doesn't allocate any temps on the heap.) the callback object itself stores the parameter type list.
unfortunately, since the data element is always last, but the number of arguments is not known until we have the callback object, we can't pass gperl_callback_invoke directly to functions requiring a callback; you'll have to write a proxy callback which calls gperl_callback_invoke.
Create and return a new GPerlCallback; use gperl_callback_destroy when you are finished with it. func: perl subroutine to call. this SV will be copied, so don't worry about reference counts. must not be #NULL. data: scalar to pass to func in addition to all other arguments. the SV will be copied, so don't worry about reference counts. may be #NULL. n_params: the number of elements in param_types. param_types: the #GType of each argument that should be passed from the invocation to func. may be #NULL if n_params is zero, otherwise it must be n_params elements long or nasty things will happen. this array will be copied; see gperl_callback_invoke() for how it is used. return_type: the #GType of the return value, or 0 if the function has void return.
Dispose of callback.
Marshall the variadic parameters according to callback's param_types, and then invoke callback's subroutine in scalar context, or void context if the return type is G_TYPE_VOID. If return_value is not NULL, then value returned (if any) will be copied into return_value. A typical callback handler would look like this: static gint real_c_callback (Foo * f, Bar * b, int a, gpointer data) { GPerlCallback * callback = (GPerlCallback*)data; GValue return_value = {0,}; gint retval; g_value_init (&return_value, callback->return_type); gperl_callback_invoke (callback, &return_value, f, b, a); retval = g_value_get_int (&return_value); g_value_unset (&return_value); return retval; }
Like Event, Tk, and most other callback-using, event-based perl
modules, Glib traps exceptions that happen in callbacks. To enable your
code to do something about these exceptions, Glib stores a list of
exception handlers which will be called on the trapped exceptions. This
is completely distinct from the $SIG{_ _DIE_ _} mechanism
provided by Perl itself, for various reasons (not the least of which is
that the Perl docs and source code say that $SIG{_ _DIE_ _}
is intended for running as the program is about to exit, and other
behaviors may be removed in the future (apparently a source of much
debate on p5p)).
Install a GClosure to be executed when gperl_closure_invoke() traps an exception. The closure should return boolean (TRUE if the handler should remain installed) and expect to receive a perl scalar. This scalar will be a private copy of ERRSV ($@) which the handler can mangle to its heart's content. The return value is an integer id tag that may be passed to gperl_removed_exception_handler().
Remove the exception handler identified by tag, as returned by gperl_install_exception_handler(). If tag cannot be found, this does nothing. WARNING: this function locks a global data structure, so do NOT call it recursively. also, calling this from within an exception handler will result in a deadlock situation. if you want to remove your handler just have it return FALSE.
Invoke whatever exception handlers are installed. You will need this if you have written a custom marshaler. Uses the value of the global ERRSV.
You need this function only in rare cases, usually as workarounds for
bad signal parameter types or to implement writable arguments. Use the
given marshaller to marshal all handlers for
detailed_signal on instance_type.
gperl_signal_connect will look for marshallers registered
here, and apply them to the GPerlClosure it creates for the given
callback being connected. A canonical form of detailed_signal
will be used so that marshaller is applied for all possible
spellings of the signal name. Use the helper macros in gperl_marshal.h
to help write your marshaller function. That header, which is installed
with the Glib module but not #included through gperl.h, includes
commentary and examples which you should follow closely to avoid nasty
bugs. Use the Source, Luke. WARNING: Bend over backwards and turn your
head around 720 degrees before attempting to write a GPerlClosure
marshaller without using the macros in gperl_marshal.h. If you
absolutely cannot use those macros, be certain to understand what those
macros do so you can get the semantics correct, and keep your code
synchronized with them, or you may miss very important bugfixes.
The actual workhorse behind GObject::signal_connect, the binding for
g_signal_connect, for use from within XS. This creates a
GPerlClosure wrapper for the given callback and
data, and connects that closure to the signal named
detailed_signal on the given GObject instance. This is
only good for named signals. flags is the same as for
g_signal_connect(). data may be NULL, but
callback must not be. Returns the id of the installed
callback.
perlapi (1), perlguts (1), GLib Reference Manual, Glib (3pm), Glib::devel (3pm).
This file was automatically generated from the source code of the Glib module, which is maintained by the gtk2-perl team.
Copyright (C) 2003 by the gtk2-perl team (see the file AUTHORS for the full list)
This library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2.1 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 Library General Public License for more details.
You should have received a copy of the GNU Library General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.