Go中没有SWIG和第三方lib的OpenCV

Question

Main goal: Make OpenCV work in Go without SWIG and third party lib (an application to compare image in linux using Go)

I am new in all the kits (OpenCv Go and linux)

1. Can image detection (feature2d etc) can be done by C-api only? There is no convenient way to call C++ code and C-api is not updated(?)

2. I have followed How to use C++ in Go? but I failed. When I make, I got the following errors

makefile:5: /usr/local/go/bin/src/Make.amd64: No such file or directory
makefile:6: /usr/local/go/bin/src/Make.pkg: No such file or directory
makefile:8: * missing separator. Stop.

The makefile is as followed

GOROOT=/usr/local/go/bin  
   GOARCH=amd64  
   TARG=foo  
   CGOFILES=foo.go  
   include $(GOROOT)/src/Make.$(GOARCH)  
   include $(GOROOT)/src/Make.pkg  
   foo.o:foo.cpp  
   g++ $(_CGO_CFLAGS_$(GOARCH)) -fPIC -O2 -o $@ -c $(CGO_CFLAGS) $<  
   cfoo.o:cfoo.cpp  
   g++ $(_CGO_CFLAGS_$(GOARCH)) -fPIC -O2 -o $@ -c $(CGO_CFLAGS) $<  
   CGO_LDFLAGS+=-lstdc++  
   $(elem)_foo.so: foo.cgo4.o foo.o cfoo.o  
   gcc $(_CGO_CFLAGS_$(GOARCH)) $(_CGO_LDFLAGS_$(GOOS)) -o $@ $^ $(CGO_LDFLAGS)  

Thanks a lot

Answer 1

You can't call C++ code without either writing C wrappers (+ cgo) yourself or using SWIG, that's just the way it is sadly.

That post you linked is extremely outdated and can't be used anymore.

On the other hand, you can always start rewriting opencv in pure go, the speed differences won't be that massive, specially if you learn how to use unsafe for the speed-critical parts.

disclaimer using unsafe is not advised since, well, it's unsafe.