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From Wes McKinney <wesmck...@gmail.com>
Subject Re: why I can't use `arrow::py::import_pyarrow()' in c++
Date Tue, 18 May 2021 13:45:58 GMT
You have to initialize the Python interpreter when using it embedded in a
C++ application.

On Tue, May 18, 2021 at 8:36 AM auderson <auderson@qq.com> wrote:

> Thanks for your reply!
>
> After I linked arrow_python_shared, calling import_pyarrow now caused a
> SEGFAULT.
>
> I've posted my code on stackoverflow c++ - arrow::py::import_pyarrow()
> cause a SEGMENTATION FAULT - Stack Overflow
> <https://stackoverflow.com/questions/67584033/arrowpyimport-pyarrow-cause-a-segmentation-fault>
>
> I'm pretty new to C++, and maybe there are protocols I did't follow?
> ------------------ Original ------------------
> *From:* "user" <wesmckinn@gmail.com>;
> *Date:* Tue, May 18, 2021 09:15 PM
> *To:* "user"<user@arrow.apache.org>;
> *Subject:* Re: why I can't use `arrow::py::import_pyarrow()' in c++
>
> You have to link libarrow_python (arrow_python_shared) where this symbol
> is found.
>
> On Tue, May 18, 2021 at 3:09 AM auderson <auderson@qq.com> wrote:
>
>> Hi,
>>
>> I'm using arrow-cpp 4.0.0 installed from conda. I also have pyarrow 4.0.0
>> installed.
>>
>> In my test.cpp file, import_pyarrow() will throw an error: undefined
>> reference to `arrow::py::import_pyarrow()'
>>
>> #mini_example.cpp
>>
>> #include "mini_example.h"
>> #include <arrow/python/pyarrow.h>
>>
>> int main() {
>>     arrow::py::import_pyarrow();
>> }
>>
>>  #mini_example.h
>>
>>
>> #include <arrow/python/pyarrow.h>
>>
>> int main() {
>>     arrow::py::import_pyarrow();
>> }
>>
>>
>> #CMakeLists.txt
>>
>> cmake_minimum_required(VERSION 3.10.0)
>> project(TEST)
>> set(CMAKE_CXX_STANDARD 17)
>>
>> list(APPEND CMAKE_PREFIX_PATH "/home/auderson/miniconda3/lib/cmake/arrow")
>> find_package(Arrow REQUIRED)
>>
>>
>> include_directories(.
>>         /home/auderson/miniconda3/include
>>         /home/auderson/miniconda3/include/python3.8)
>>
>> add_executable(TEST
>>         mini_example.cpp
>>         )
>>
>> target_link_libraries(${PROJECT_NAME} PRIVATE /home/auderson/miniconda3/lib/libpython3.8.so)
>> target_link_libraries(${PROJECT_NAME} PRIVATE arrow_shared)
>>
>> The full output:
>>
>> CMakeFiles/TEST.dir/mini_example.cpp.o: In function `main':
>> /tmp/tmp.vmULkzpuYF/mini_example.cpp:9: undefined reference to `arrow::py::import_pyarrow()'
>> collect2: error: ld returned 1 exit status
>>
>> But other functionalities works fine, like create an Array then build a Table from
them. In fact I'm just stuck at the last step where I have to wrap the table so that they
can be passed to cython.
>>
>> Can you find where I'm doing wrong? Thanks!
>>
>> Auderson
>>
>>
>>

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