空指针导致程序出错

service/tool.go

@@ -46,13 +46,30 @@ func GetDeviceCurrentFrame(device_id int) (gocv.Mat, int) {
 	if !ok {
 		return gocv.NewMat(), -1
 	}
-	mutex := mutex_.(*sync.RWMutex)
+	mutex, ok := mutex_.(*sync.RWMutex)
+	if !ok {
+		log.Fatalf("DeviceRWMap 存储的不是 *sync.RWMutex 类型，device_id: %d", device_id)
+	}
 	mutex.RLock()
 	defer mutex.RUnlock()
 	//获取当前帧
-	frame, ok := DeviceCurrentFrameMap.Load(device_id)
-	frame_count, ok := DeviceFrameCount.Load(device_id)
-	return frame.(gocv.Mat), frame_count.(int)
+	frameIface, ok := DeviceCurrentFrameMap.Load(device_id)
+	if !ok {
+		return gocv.NewMat(), -1
+	}
+	frame, ok := frameIface.(gocv.Mat)
+	if !ok {
+		log.Fatalf("DeviceCurrentFrameMap 存储的不是 gocv.Mat 类型，device_id: %d", device_id)
+	}
+	frame_countIface, ok := DeviceFrameCount.Load(device_id)
+	if !ok {
+		return gocv.NewMat(), -1
+	}
+	frame_count, ok := frame_countIface.(int)
+	if !ok {
+		log.Fatalf("DeviceFrameCount 存储的不是 int 类型，device_id: %d", device_id)
+	}
+	return frame, frame_count
 }
 
 func getVideoFrame(device proto.DeviceInfo) {