使用分离的全局变量存储帧，不用map

handler/tool.go

@@ -164,8 +164,7 @@ func subscribeAndHandleMessagesV3(ws *websocket.Conn, device_id int) {
 	t_count := 0
 	for {
 		//从service获取当前帧
-		var img gocv.Mat
-		c := service.GetDeviceCurrentFrameV2(&img, device_id)
+		img, c := service.GetDeviceCurrentFrameV3(device_id)
 		if c != count {
 			//将img转[]byte
 			if img.Empty() {

main.go

@@ -104,6 +104,12 @@ func ReadConfigAndSetSystem() {
 			service.DeviceIsGettingFrame.Store(device.ID, false)
 		}
 		if is_get == false && device.NextStop == false { //如果设备流已经停止且不暂停，则开启
+			switch device.ID {
+			case 1:
+				service.Device1CurrentFrame = gocv.NewMat()
+			case 50:
+				service.Device50CurrentFrame = gocv.NewMat()
+			}
 			go service.GetVideoStream(device.ID)
 			log.Printf("device:%d has started!\n", device.ID)
 		}

service/tool.go

@@ -18,6 +18,8 @@ var DeviceRWMap = &sync.Map{}
 var DeviceCurrentFrameMap = &sync.Map{}
 var DeviceFrameCount = &sync.Map{}
 var DeviceIsGettingFrame = &sync.Map{}
+var Device1CurrentFrame gocv.Mat
+var Device50CurrentFrame gocv.Mat
 
 func SetDeviceCurrentFrame(frame gocv.Mat, device_id int) error {
 	//获取读写锁
@@ -51,6 +53,32 @@ func SetDeviceCurrentFrame(frame gocv.Mat, device_id int) error {
 	return nil
 }
 
+func SetDeviceCurrentFrameV2(frame gocv.Mat, device_id int) error {
+	//获取读写锁
+	mutex_, ok := DeviceRWMap.Load(device_id)
+	if !ok {
+		return fmt.Errorf("设备:%s 读写锁不存在", device_id)
+	}
+	mutex := mutex_.(*sync.RWMutex)
+	mutex.Lock()
+	defer mutex.Unlock()
+	//设置当前帧
+	switch device_id {
+	case 1:
+		Device1CurrentFrame = frame
+	case 50:
+		Device50CurrentFrame = frame
+	}
+	frame_count, ok := DeviceFrameCount.Load(device_id)
+	if !ok {
+		return fmt.Errorf("设备:%s 当前帧计数不存在", device_id)
+	}
+	frame_count_ := frame_count.(int)
+	frame_count_++
+	DeviceFrameCount.Store(device_id, frame_count_)
+	return nil
+}
+
 func GetDeviceCurrentFrameV2(frame *gocv.Mat, deviceId int) int {
 	defer func() {
 		if err := recover(); err != nil {
@@ -92,6 +120,45 @@ func GetDeviceCurrentFrameV2(frame *gocv.Mat, deviceId int) int {
 	return frame_count
 }
 
+func GetDeviceCurrentFrameV3(deviceId int) (gocv.Mat, int) {
+	defer func() {
+		if err := recover(); err != nil {
+			log.Printf("设备:%d 错误: %v\n", deviceId, err)
+		}
+	}()
+
+	//获取读写锁
+	mutex_, ok := DeviceRWMap.Load(deviceId)
+	if !ok {
+		log.Printf("DeviceRWMap 读写锁不存在，device_id: %d \n", deviceId)
+		return gocv.NewMat(), -1
+	}
+	mutex, ok := mutex_.(*sync.RWMutex)
+	if !ok {
+		log.Printf("DeviceRWMap 存储的不是 *sync.RWMutex 类型，device_id: %d \n", deviceId)
+		return gocv.NewMat(), -1
+	}
+	mutex.RLock()
+	defer mutex.RUnlock()
+	//获取当前帧
+	var frame gocv.Mat
+	switch deviceId {
+	case 1:
+		frame = Device1CurrentFrame
+	case 50:
+		frame = Device50CurrentFrame
+	}
+
+	frame_countIface, ok := DeviceFrameCount.Load(deviceId)
+	if !ok {
+		return gocv.NewMat(), -1
+	}
+	frame_count, ok := frame_countIface.(int)
+	if !ok {
+		log.Printf("DeviceFrameCount 存储的不是 int 类型，device_id: %d", deviceId)
+	}
+	return frame, frame_count
+}
 func GetDeviceCurrentFrame(deviceId int) (gocv.Mat, int) {
 	defer func() {
 		if err := recover(); err != nil {
@@ -185,7 +252,7 @@ func getVideoFrame(device proto.DeviceInfo) {
 		currentTime := time.Now().Format("2006-01-02 15:04:05")
 		gocv.PutText(&frame, currentTime, image.Point{10, 20}, font, fontScale, fontColor, lineType)
 		//需要将帧付给全局变量
-		err3 := SetDeviceCurrentFrame(frame, device.ID)
+		err3 := SetDeviceCurrentFrameV2(frame, device.ID)
 		if err3 != nil {
 			log.Printf("设备:%d 错误: 无法设置当前帧,err:%s \n", device.ID, err3.Error())
 		}