Is There a Way to Generate Code for OpenDDS

Question

I know that RTI has a code generator to create the publisher and subscriber which then allow you to create DataReaders and DataWriters. Is there any way to generate the needed code in OpenDDS? I have already established the idl file that lists the topics to be transmitted and I see here: https://objectcomputing.com/resources/publications/mnb/code-generation-with-opendds-part-i provides instructions to generate a wrapper but I am still not understanding if there is a way to simply build the idl file so that it generates the publisher and subscriber files needed for the OpenDDS architecture. For example RTI has rtiddsgen.

When I build the file using only Messenger.idl the error message comes up:

-- Selecting Windows SDK version 10.0.18362.0 to target Windows 10.0.19041.
-- Looking for C++ include pthread.h
-- Looking for C++ include pthread.h - not found
-- Found Threads: TRUE
-- Configuring done
CMake Error at CMakeLists.txt:15 (add_executable):
  Cannot find source file:

    Publisher.cpp

  Tried extensions .c .C .c++ .cc .cpp .cxx .cu .m .M .mm .h .hh .h++ .hm
  .hpp .hxx .in .txx


CMake Error at CMakeLists.txt:22 (add_executable):
  Cannot find source file:

    Subscriber.cpp

  Tried extensions .c .C .c++ .cc .cpp .cxx .cu .m .M .mm .h .hh .h++ .hm
  .hpp .hxx .in .txx


CMake Error at CMakeLists.txt:15 (add_executable):
  No SOURCES given to target: publisher


CMake Error at CMakeLists.txt:22 (add_executable):
  No SOURCES given to target: subscriber

The cmake file looks like this:


    project(OpenDDS_DevGuide_Messenger CXX)
cmake_minimum_required(VERSION 3.8.2)

find_package(OpenDDS REQUIRED)

set(CMAKE_CXX_COMPILER ${OPENDDS_COMPILER})

set(opendds_libs
  OpenDDS::Dcps # Core OpenDDS Library
  OpenDDS::InfoRepoDiscovery OpenDDS::Tcp # For run_test.pl
  OpenDDS::Rtps OpenDDS::Rtps_Udp # For run_test.pl --rtps
)

# Publisher
add_executable(publisher
  Publisher.cpp
)
OPENDDS_TARGET_SOURCES(publisher Messenger.idl)
target_link_libraries(publisher ${opendds_libs})

# Subscriber
add_executable(subscriber
  Subscriber.cpp
  DataReaderListenerImpl.cpp
)
OPENDDS_TARGET_SOURCES(subscriber Messenger.idl)
target_link_libraries(subscriber ${opendds_libs})

score 0 · Accepted Answer · answered Jan 08 '21 at 02:41

0

Yes, OpenDDS has a code generator, opendds_idl, which is one of OpenDDS's core components. It can run manually, through MPC, or in CMake using OPENDDS_TARGET_SOURCES like you have here.

The error is pretty self explanatory. This is the CMakeLists.txt file from the Developer's Guide Messenger example, which includes C++ files. CMake can't find them. Maybe you copied CMakeLists.txt somewhere else without also copying the cpp files? If so you can copy the cpp files to where you copied CMakeLists.txt.

answered Jan 08 '21 at 02:41

Fred Hornsey

309
1
10

I thought opendds_idl creates the support files for the idl not the publisher and subscriber like RTI's rtiddsgen – rosiepati Jan 11 '21 at 23:57
I think you are referring to boilerplate code @ros? If so, yes, opendds_idl doesn't generate that, but you can easily copy that from the examples/tests, all are part of OpenDDS – Johnny Willemsen Jan 12 '21 at 10:12

Is There a Way to Generate Code for OpenDDS

1 Answers1