b.pm

视频监控网络部分的协议ddns,的模块的实现代码,请大家大胆指正.

                             |
                +------------+------------+------------+
                |            |            |            |
              B::PV        B::IV        B::NV        B::RV
                  \         /           /
                   \       /           /
                    B::PVIV           /
                         \           /
                          \         /
                           \       /
                            B::PVNV
                               |
                               |
                            B::PVMG
                               |
                   +-----+-----+-----+-----+
                   |     |     |     |     |
                 B::AV B::GV B::HV B::CV B::IO
                         |           |
                         |           |
                      B::PVLV      B::FM


For 5.9.0 and earlier, PVLV is a direct subclass of PVMG, and BM is still
present as a distinct type, so the base of this diagram is


                               |
                               |
                            B::PVMG
                               |
            +------+-----+-----+-----+-----+-----+
            |      |     |     |     |     |     |
         B::PVLV B::BM B::AV B::GV B::HV B::CV B::IO
                                           |
                                           |
                                         B::FM


Access methods correspond to the underlying C macros for field access,
usually with the leading "class indication" prefix removed (Sv, Av,
Hv, ...). The leading prefix is only left in cases where its removal
would cause a clash in method name. For example, C<GvREFCNT> stays
as-is since its abbreviation would clash with the "superclass" method
C<REFCNT> (corresponding to the C function C<SvREFCNT>).

=head2 B::SV Methods

=over 4

=item REFCNT

=item FLAGS

=item object_2svref

Returns a reference to the regular scalar corresponding to this
B::SV object. In other words, this method is the inverse operation
to the svref_2object() subroutine. This scalar and other data it points
at should be considered read-only: modifying them is neither safe nor
guaranteed to have a sensible effect.

=back

=head2 B::IV Methods

=over 4

=item IV

Returns the value of the IV, I<interpreted as
a signed integer>. This will be misleading
if C<FLAGS & SVf_IVisUV>. Perhaps you want the
C<int_value> method instead?

=item IVX

=item UVX

=item int_value

This method returns the value of the IV as an integer.
It differs from C<IV> in that it returns the correct
value regardless of whether it's stored signed or
unsigned.

=item needs64bits

=item packiv

=back

=head2 B::NV Methods

=over 4

=item NV

=item NVX

=back

=head2 B::RV Methods

=over 4

=item RV

=back

=head2 B::PV Methods

=over 4

=item PV

This method is the one you usually want. It constructs a
string using the length and offset information in the struct:
for ordinary scalars it will return the string that you'd see
from Perl, even if it contains null characters.

=item RV

Same as B::RV::RV, except that it will die() if the PV isn't
a reference.

=item PVX

This method is less often useful. It assumes that the string
stored in the struct is null-terminated, and disregards the
length information.

It is the appropriate method to use if you need to get the name
of a lexical variable from a padname array. Lexical variable names
are always stored with a null terminator, and the length field
(SvCUR) is overloaded for other purposes and can't be relied on here.

=back

=head2 B::PVMG Methods

=over 4

=item MAGIC

=item SvSTASH

=back

=head2 B::MAGIC Methods

=over 4

=item MOREMAGIC

=item precomp

Only valid on r-magic, returns the string that generated the regexp.

=item PRIVATE

=item TYPE

=item FLAGS

=item OBJ

Will die() if called on r-magic.

=item PTR

=item REGEX

Only valid on r-magic, returns the integer value of the REGEX stored
in the MAGIC.

=back

=head2 B::PVLV Methods

=over 4

=item TARGOFF

=item TARGLEN

=item TYPE

=item TARG

=back

=head2 B::BM Methods

=over 4

=item USEFUL

=item PREVIOUS

=item RARE

=item TABLE

=back

=head2 B::GV Methods

=over 4

=item is_empty

This method returns TRUE if the GP field of the GV is NULL.

=item NAME

=item SAFENAME

This method returns the name of the glob, but if the first
character of the name is a control character, then it converts
it to ^X first, so that *^G would return "^G" rather than "\cG".

It's useful if you want to print out the name of a variable.
If you restrict yourself to globs which exist at compile-time
then the result ought to be unambiguous, because code like
C<${"^G"} = 1> is compiled as two ops - a constant string and
a dereference (rv2gv) - so that the glob is created at runtime.

If you're working with globs at runtime, and need to disambiguate
*^G from *{"^G"}, then you should use the raw NAME method.

=item STASH

=item SV

=item IO

=item FORM

=item AV

=item HV

=item EGV

=item CV

=item CVGEN

=item LINE

=item FILE

=item FILEGV

=item GvREFCNT

=item FLAGS

=back

=head2 B::IO Methods

=over 4

=item LINES

=item PAGE

=item PAGE_LEN

=item LINES_LEFT

=item TOP_NAME

=item TOP_GV

=item FMT_NAME

=item FMT_GV

=item BOTTOM_NAME

=item BOTTOM_GV

=item SUBPROCESS

=item IoTYPE

=item IoFLAGS

=item IsSTD

Takes one arguments ( 'stdin' | 'stdout' | 'stderr' ) and returns true
if the IoIFP of the object is equal to the handle whose name was
passed as argument ( i.e. $io->IsSTD('stderr') is true if
IoIFP($io) == PerlIO_stdin() ).

=back

=head2 B::AV Methods

=over 4

=item FILL

=item MAX

=item ARRAY

=item ARRAYelt

Like C<ARRAY>, but takes an index as an argument to get only one element,
rather than a list of all of them.

=item OFF

This method is deprecated if running under Perl 5.8, and is no longer present
if running under Perl 5.9

=item AvFLAGS

This method returns the AV specific flags. In Perl 5.9 these are now stored
in with the main SV flags, so this method is no longer present.

=back

=head2 B::CV Methods

=over 4

=item STASH

=item START

=item ROOT

=item GV

=item FILE

=item DEPTH

=item PADLIST

=item OUTSIDE

=item OUTSIDE_SEQ

=item XSUB

=item XSUBANY

For constant subroutines, returns the constant SV returned by the subroutine.

=item CvFLAGS

=item const_sv

=back

=head2 B::HV Methods

=over 4

=item FILL

=item MAX

=item KEYS

=item RITER

=item NAME

=item ARRAY

=item PMROOT

This method is not present if running under Perl 5.9, as the PMROOT
information is no longer stored directly in the hash.

=back

=head2 OP-RELATED CLASSES

C<B::OP>, C<B::UNOP>, C<B::BINOP>, C<B::LOGOP>, C<B::LISTOP>, C<B::PMOP>,
C<B::SVOP>, C<B::PADOP>, C<B::PVOP>, C<B::LOOP>, C<B::COP>.

These classes correspond in the obvious way to the underlying C
structures of similar names. The inheritance hierarchy mimics the
underlying C "inheritance":

                                 B::OP
                                   |
                   +---------------+--------+--------+-------+
                   |               |        |        |       |
                B::UNOP          B::SVOP B::PADOP  B::COP  B::PVOP
                 ,'  `-.
                /       `--.
           B::BINOP     B::LOGOP
               |
               |
           B::LISTOP
             ,' `.
            /     \
        B::LOOP B::PMOP

Access methods correspond to the underlying C structre field names,
with the leading "class indication" prefix (C<"op_">) removed.

=head2 B::OP Methods

These methods get the values of similarly named fields within the OP
data structure.  See top of C<op.h> for more info.

=over 4

=item next

=item sibling

=item name

This returns the op name as a string (e.g. "add", "rv2av").

=item ppaddr

This returns the function name as a string (e.g. "PL_ppaddr[OP_ADD]",
"PL_ppaddr[OP_RV2AV]").

=item desc

This returns the op description from the global C PL_op_desc array
(e.g. "addition" "array deref").

=item targ

=item type

=item opt

=item flags

=item private

=item spare

=back

=head2 B::UNOP METHOD

=over 4

=item first

=back

=head2 B::BINOP METHOD

=over 4

=item last

=back

=head2 B::LOGOP METHOD

=over 4

=item other

=back

=head2 B::LISTOP METHOD

=over 4

=item children

=back

=head2 B::PMOP Methods

=over 4

=item pmreplroot

=item pmreplstart

=item pmnext

=item pmregexp

=item pmflags

=item extflags

=item precomp

=item pmoffset

Only when perl was compiled with ithreads.

=back

=head2 B::SVOP METHOD

=over 4

=item sv

=item gv

=back

=head2 B::PADOP METHOD

=over 4

=item padix

=back

=head2 B::PVOP METHOD

=over 4

=item pv

=back

=head2 B::LOOP Methods

=over 4

=item redoop

=item nextop

=item lastop

=back

=head2 B::COP Methods

=over 4

=item label

=item stash

=item stashpv

=item file

=item cop_seq

=item arybase

=item line

=item warnings

=item io

=item hints

=item hints_hash

=back


=head1 AUTHOR

Malcolm Beattie, C<[e-mail]>

=cut