How to write a block

GNU Radio
1

hi,
how to use the gr_modtoolto write a block inherent from a
in_tree_block,such as inherent from stream_to _vector
BZS

2

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Hi BZS,

just use gr_modtool to generate a block of the same type
(sync/hier/general/…) and then modify the include/blockname.h to
inherit from the file you want.
You will also have to use
set(GR_REQUIRED_COMPONENTS RUNTIME BLOCKS)
in the top-directory CMakeLists.txt (if the base class is in
gnuradio::blocks, otherwise replace BLOCKS by that module).

Problem is, that inheriting from the in-tree classes won’t help you
much in terms of functionality. Class structure of OOTs as well as
in-tree modules is usually (let’s assume we’re talking about a block
called bzt_block):

bzt_block: Specified only in include/bzt_block.h. Most methods are
purely virtual. Does not do anything, but specifies an interface to
use, and an shared_pointer factory (make) that returns a shared
pointer to an instance of a subclass

bzt_block_impl: subclass of bzt_block. Declared in
lib/bzt_block_impl.h, defined in lib/bzt_block_imp.cc. Has all the
methods. This class is usually hidden from “outside the module”, and
is only accessed as an instance of the bzt_block base class.

Greetings,
Marcus

On 05.03.2014 02:25, 猪猪猪猪猪猪头 wrote:

hi, how to use the gr_modtoolto write a block inherent from a
in_tree_block,such as inherent from stream_to _vector BZS

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