how can I use gcc to create .so file

[SmileChen007]

Thanks, I use Python, so i use lodepng.c and lodepng.h to create .so file by gcc on ubuntu, then it create liblodepng.so .
The order is 'gcc lodepng.c -I ./ -fPIC -shared -o liblodepng.so'
but when i use this liblodepng.so, it report a bug,

The bug is :
bash: line 1: 14557 Segmentation fault (core dumped) env "PYTHONUNBUFFERED"="1" "PYTHONPATH"="/tmp/pycharm_project_500:/root/.pycharm_helpers/pycharm_matplotlib_backend" "PYCHARM_HOSTED"="1" "JETBRAINS_REMOTE_RUN"="1" "PYCHARM_MATPLOTLIB_PORT"="52649" "PYTHONIOENCODING"="UTF-8" '/home/ubuntu/env/env_fun/bin/python3.5' '-u' '/tmp/pycharm_project_500/png/test.py'

i don't why, the zip file it contains liblodepng.so
liblodepng.zip

[lvandeve]

Thanks for your report,

Is there any way in your setup that you can get a stack trace of the C code that runs?

In C, the signature of lodepng_decode32_file is:

unsigned lodepng_decode32_file(unsigned char** out, unsigned* w, unsigned* h,
const char* filename);

Are width and height pointers in your code? If "width = 0" means it's a null pointer, that will cause a crash since it wants to write the width to the unsigned integer it points to. Same also for raw_rgba_pixels where it wants to output a pointer to a a buffer it allocates inside. How are pointers handled in this setup?

Thanks

[SmileChen007]

ok,thanks,I try another way to solve my problem, I run executable file to handle my png.