golang通过cgo调用C++程序

实现功能：再golang中调用C++生成的动态库.so，以实现一些功能，比如：golang中调用C++调用的opencv库得到的结果

需要的东西：

1：C++使用Makefile编译成的动态库

2：C++文件

3：golang中的调用代码

1：Makefile文件编写：

HASH_LIBS += -L./lib -L./ -lopencv_core -lopencv_highgui -lopencv_imgproc -lopencv_imgcodecs -lopencv_img_hash

TEST_LIBS += $(HASH_LIBS) -lCImageUtil -lboost_filesystem -lopencv_videoio

INCS += -I./include -I ./

CXXFLAGS += $(INCS) -fPIC ?-Wall -O2 -std=c++11

TARGET ? = -shared -o lib/libCImageUtil.so

COMM_SRCS+= opencv_hash.cc scale_image.cc algo.cc md5.cc

#COMM_OBJS=$(COMM_SRCS:.cc=.o)

main_test : main-test.cc

?? ?$(CXX) $(CXXFLAGS) $< -o $@ $(TEST_LIBS)?

CImageUtil:

?? ?$(CXX) $(CXXFLAGS) $(COMM_SRCS) -o $@ $(HASH_LIBS) $(TARGET)

all: CImageUtil main_test

2：所调用的头文件

#pragma once

#ifdef __cplusplus

extern "C" {

#endif

void calc_phash(const char *str,int len,char* test,int* flag);

int scale_image(const char* src,int srclen,char** dist,int* distlen,char* error);

#ifdef __cplusplus ?

}

#endif

3:所调用的cpp文件

#include "CImageUtil.h"

int scale_image(const char* src,char* err) {

? return 0;

}

void calc_phash(const char *img,char* phash_result,int* flag)

{

}

4：再golang中的调用

package common

/*

#cgo ?CFLAGS: -I ../../../ccgo/include/

#cgo ?LDFLAGS: -L ../../../ccgo/lib/ -lrt -lCImageUtil -lopencv_core -lopencv_highgui -lboost_system -lopencv_imgproc -lopencv_imgcodecs -lboost_filesystem -lopencv_img_hash -lopencv_videoio -lstdc++

#include "CImageUtil.h"

#include

*/

import "C"

//注意这里要空一行。

import (

?? ?"encoding/json"

?? ?"errors"

?? ?"fmt"

?? ?"shumei/mainif/log"

?? ?"shumei/mainif/config"

?? ?"strconv"

?? ?"strings"

?? ?"time"

?? ?"unsafe"

)

func (this *ParamsChecker) PhashProcess(ip *ImgParams,imgBytes []byte) error {

?? ?st := time.Now().UnixNano()

?? ?var phash [32]byte

?? ?var flag int = 10

?? ?C.calc_phash((*C.char)(unsafe.Pointer(&imgBytes[0])),C.int(len(imgBytes)),(*C.char)(unsafe.Pointer(&phash[0])),(*C.int)(unsafe.Pointer(&flag)))

?? ?if flag != 10 {

?? ??? ?return errors.New(fmt.Sprintf("ERROR cgo image info wrong: %v",flag))

?? ?}

?? ?ip.Data["phash_vector"] = phash

?? ?return nil

}

func (this *ParamsChecker) ScaleImage(ip *ImgParams,imgBytes []byte) error {

?? ?st := time.Now().UnixNano()

?? ?var distimg *C.char

?? ?var distlen C.int

?? ?var errscale []byte = make([]byte,256)

?? ?defer func() {

?? ??? ?if distimg != nil {

?? ??? ??? ?defer C.free(unsafe.Pointer(distimg))

?? ??? ??? ?distimg = nil

?? ??? ?}

?? ?}()

?? ?code := C.scale_image((*C.char)(unsafe.Pointer(&imgBytes[0])),&distimg,&distlen,(*C.char)(unsafe.Pointer(&errscale[0])))

?? ?distmsgstr := C.GoStringN(distimg,distlen)

?? ?if code == 0 && distimg != nil {

?? ??? ?imgBytes = []byte(distmsgstr)

?? ??? ?ip.Data["img"] = utils.Base64Encode(imgBytes)

?? ?} else {

?? ??? ?return errors.New("image scale error")

?? ?}

?? ?return nil

}

（编辑：李大同）

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