准备工作
开发环境信息
Windows10CH-HCNetSDKV6.0.2.35_build20190411_Win64go1.12.7改写HCNetSDK.h头文件
C++查询资料后得知，该头文件中有以下情况，就不能通过编译：
//这里是注释1 /*这里是注释2*/#define xxxxxxxxxHCNetSDK.h改造规则如下：
NET_DVR_API__std开发过程
基本数据类型转换
由于在开发过程中涉及到基本的golang和c的数据类型转换，查阅资料后，转换对应关系如下：
| char | C.char | byte |
| singed char | C.schar | int8 |
| unsigned char | C.uchar | uint8 |
| short | C.short | int16 |
| unsigned short | C.ushort | uint16 |
| int | C.int | int32 |
| unsigned int | C.uint | uint32 |
| long | C.long | int32 |
| unsigned long | C.ulong | uint32 |
| long long int | C.longlong | int64 |
| unsigned long long int | C.ulonglong | uint64 |
| float | C.float | float32 |
| double | C.double | float64 |
| size_t | C.size_t | uint |
注意 C 中的整形比如 int 在标准中是没有定义具体字长的，但一般默认认为是 4 字节，对应 CGO 类型中 C.int 则明确定义了字长是 4 ，但 golang 中的 int 字长则是 8 ，因此对应的 golang 类型不是 int 而是 int32 。为了避免误用，C 代码最好使用 C99 标准的数值类型，对应的转换关系如下：
| int8_t | C.int8_t | int8 |
| uint8_t | C.uint8_t | uint8 |
| int16_t | C.int16_t | int16 |
| uint16_t | C.uint16_t | uint16 |
| int32_t | C.int32_t | int32 |
| uint32_t | C.uint32_t | uint32 |
| int64_t | C.int64_t | int64 |
| uint64_t | C.uint64_t | uint64 |
业务开发
HCNetSDK.go
package main
/*
#cgo CFLAGS: -I.
#cgo LDFLAGS: -L. -lHCCore
#cgo LDFLAGS: -L. -lHCNetSDK
#include "HCNetSDK.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
*/
import "C"
import (
"errors"
"fmt"
"time"
"unsafe"
)
// 是否有错误
func isErr(oper string) error {
errno := int64(C.NET_DVR_GetLastError())
if errno > 0 {
reMsg := fmt.Sprintf("%s摄像头失败,失败代码号：%d", oper, errno)
return errors.New(reMsg)
}
return nil
}
// 初始化海康摄像头
func Init() (err error) {
C.NET_DVR_Init()
if err = isErr("Init"); err != nil {
return
}
// 设置连接时间
C.NET_DVR_SetConnectTime(C.DWORD(2000), C.DWORD(1))
if err = isErr("SetConnectTime"); err != nil {
return
}
return nil
}
// 登录摄像头
func Login() (int64,error) {
var deviceinfoV30 C.NET_DVR_DEVICEINFO_V30
c_ip := C.CString("192.168.1.64")
defer C.free(unsafe.Pointer(c_ip))
c_login := C.CString("admin")
defer C.free(unsafe.Pointer(c_login))
c_password := C.CString("admin")
defer C.free(unsafe.Pointer(c_password))
msgId := C.NET_DVR_Login_V30(c_ip,C.WORD(8080),c_login,c_password,
(*C.NET_DVR_DEVICEINFO_V30)(unsafe.Pointer(&deviceinfoV30)),
)
if int64(msgId) < 0 {
if err := isErr("Login"); err != nil {
return -1,err
}
return -1,errors.New("登录摄像头失败")
}
return int64(msgId),nil
}
// 退出摄像头登录
// uid:摄像头登录成功的id
func Logout(uid int64) error {
C.NET_DVR_Logout_V30(C.LONG(uid))
if err := isErr("Logout"); err != nil {
return err
}
return nil
}
// 播放视频
// uid:摄像头登录成功的id
// 返回播放视频标识 pid
func Play(uid int64)(int64, error) {
var pDetectInfo C.NET_DVR_CLIENTINFO
pDetectInfo.lChannel = C.LONG(1)
pid := C.NET_DVR_RealPlay_V30(C.LONG(uid),(*C.NET_DVR_CLIENTINFO)(unsafe.Pointer(&pDetectInfo)),nil,nil,C.BOOL(1))
if int64(pid) < 0 {
if err := isErr("Play"); err != nil {
return -1,err
}
return -1,errors.New("播放失败")
}
return int64(pid),nil
}
// 抓拍
func Capture(uid int64) (string, error){
picPath := "D:\\" + time.Now().Format("20060102150405") + ".jpeg"
var jpegpara C.NET_DVR_JPEGPARA
var lChannel uint32 = 1
c_path := C.CString(picPath)
defer C.free(unsafe.Pointer(c_path))
msgId := C.NET_DVR_CaptureJPEGPicture(C.LONG(uid), C.LONG(lChannel),
(*C.NET_DVR_JPEGPARA)(unsafe.Pointer(&jpegpara)),
c_path,
)
if int64(msgId) < 0 {
if err := isErr("Capture"); err != nil {
return "",err
}
return "",errors.New("抓拍失败")
}
return picPath,nil
}
// 停止相机
// pid 播放标识符
func PtzStop(pid int64) error {
msgId := C.NET_DVR_StopRealPlay(C.LONG(pid))
if int64(msgId) < 0 {
if err := isErr("PtzStop"); err != nil {
return err
}
return errors.New("停止相机失败")
}
return nil
}
func main() {
var err error
err = Init()
defer Close()
if err != nil {
log.Fatal(err.Error())
}
var uid int64
if uid,err = Login();err != nil {
log.Fatal(err.Error())
}
var picPath string
if picPath,err = Capture(uid);err != nil {
log.Fatal(err.Error())
}
log.Println("图片路径:",picPath)
var pid int64
if pid,err = Play(uid);err != nil {
log.Fatal(err.Error())
}
if err = PtzStop(pid);err != nil {
log.Fatal(err.Error())
}
if err = Logout(uid);err != nil {
log.Fatal(err.Error())
}
}
Makefile
export CGO_ENABLED=1
export WDIR=${PWD}
all: windows
windows:
CGO_LDFLAGS_ALLOW=".*" CGO_CFLAGS="-I${WDIR}/include" CGO_LDFLAGS="-L${WDIR}/lib/Windows -Wl,--enable-stdcall-fixup,-rpath=${WDIR}/lib/Windows -lHCNetSDK" GOOS=windows CC=x86_64-w64-mingw32-gcc CXX=x86_64-w64-mingw32-g++ go build -ldflags "-s -w" -o build/Windows/hk.exe src/HCNetSDK.go
cp lib/Windows/HCNetSDK.dll build/Windows/
cp lib/Windows/HCCore.dll build/Windows/
cp -r lib/Windows/HCNetSDKCom/ build/Windows/
clean:
rm -r build/
通过make命令该文件即可。(注意海康开发文档中的说明)