GOCV PointVector fatal error unexpected signal during runtime execution error

[mossy prism]

Hey! Is anyone here familiar with GOCV (OpenCV wrapper for Golang)?
I'm encountering this weird error. The code from screenshot 1 works great.

But when I try to use the gocv.PointVector struct, I get the following error

[signal SIGSEGV: segmentation violation code=0x1 addr=0x8 pc=0x4c4b10]```

The full code is in screenshot 2. This is the complete log of the non-working code:

Starting
Read the image
Created points array
Created point vector
fatal error: unexpected signal during runtime execution
[signal SIGSEGV: segmentation violation code=0x1 addr=0x8 pc=0x4c4b10]

runtime stack:
runtime.throw(0x50084b, 0x2a)
/usr/local/go/src/runtime/panic.go:1117 +0x72
runtime.sigpanic()
/usr/local/go/src/runtime/signal_unix.go:718 +0x2e5

goroutine 1 [syscall]:
runtime.cgocall(0x4bd310, 0xc00003fe28, 0x4ae737)
/usr/local/go/src/runtime/cgocall.go:154 +0x5b fp=0xc00003fdf8 sp=0xc00003fdc0 pc=0x41f9db
gocv.io/x/gocv._Cfunc_PointVector_Size(0x0, 0x0)
_cgo_gotypes.go:6541 +0x45 fp=0xc00003fe28 sp=0xc00003fdf8 pc=0x4ba165
gocv.io/x/gocv.PointVector.Size.func1(0x0, 0x0)
/go/pkg/mod/gocv.io/x/[email protected]/core.go:2074 +0x4d fp=0xc00003fe58 sp=0xc00003fe28 pc=0x4ba50d
gocv.io/x/gocv.PointVector.Size(0x0, 0xc000010018)
/go/pkg/mod/gocv.io/x/[email protected]/core.go:2074 +0x2b fp=0xc00003fe78 sp=0xc00003fe58 pc=0x4ba32b
main.main()
/usr/src/myapp/main.go:37 +0x296 fp=0xc00003ff88 sp=0xc00003fe78 pc=0x4ba976
runtime.main()
/usr/local/go/src/runtime/proc.go:225 +0x256 fp=0xc00003ffe0 sp=0xc00003ff88 pc=0x451ed6
runtime.goexit()
/usr/local/go/src/runtime/asm_amd64.s:1371 +0x1 fp=0xc00003ffe8 sp=0xc00003ffe0 pc=0x481361

I'm running the commands from Docker with the following commands

docker run --platform linux/amd64 --rm -v "$PWD":/usr/src/myapp -w /usr/src/myapp gocv/opencv sh -c "go build -o main main.go && ./main"

Thank you in advance!

[sterile ruin]

It's probably because you're calling Size on origImg, which is empty

If origImg was filled with data then that probably wouldn't explode

You should try NewPointVector() or NewPointVectorFromPoints(imgPoints)

The first will create an empty point vector properly.

GoCv is a wrapper around the C implementation so this is why empty things can be trouble. Thanks C 👍

[mossy prism]

Hey @sterile ruin , thank yo for quick answer! I tried also the Append function first, but It gave me the sam error (on the Append function this time).

But however, the NewPointVectorFromPoints() function worked, so thank you very much!

[sterile ruin]

Awesome! Yeah if you want to append you'll have to use NewPointVector() instead of GoCv.PointVector{}