diff --git a/HikBallCamera.go b/HikBallCamera.go
new file mode 100644
index 0000000..538ba8f
--- /dev/null
+++ b/HikBallCamera.go
@@ -0,0 +1,159 @@
+package HikNetSDK
+
+import (
+    "fmt"
+    "sync"
+    "unsafe"
+)
+
+type HIKBallCamera struct {
+    core          unsafe.Pointer
+    State         bool
+    BallCameraCfg BallCamera
+    mux           sync.RWMutex
+}
+
+func NewHIKBallCamera(BallCameraCfg BallCamera) *HIKBallCamera {
+    return &HIKBallCamera{
+        core:          newHIKBallCamera(),
+        BallCameraCfg: BallCameraCfg,
+        State:         false,
+        mux:           sync.RWMutex{},
+    }
+}
+
+func (hikBC *HIKBallCamera) Login() bool {
+    hikBC.mux.Lock()
+    hikBC.State = initBallCamera(hikBC.core, hikBC.BallCameraCfg.Ip, hikBC.BallCameraCfg.Port, hikBC.BallCameraCfg.User, hikBC.BallCameraCfg.Password, hikBC.BallCameraCfg.Type)
+    hikBC.mux.Unlock()
+    return hikBC.State
+}
+
+func (hikBC *HIKBallCamera) opt(action func() bool) bool {
+    hikBC.mux.RLock()
+    if hikBC.State {
+        hikBC.mux.RUnlock()
+        hikBC.mux.Lock()
+        hikBC.State = action()
+        hikBC.mux.Unlock()
+    } else {
+        hikBC.mux.RUnlock()
+    }
+    return hikBC.State
+}
+
+func (hikBC *HIKBallCamera) PTZGet(P, T, Z *float32) bool {
+    return hikBC.opt(func() bool {
+        return ptzGet(hikBC.core, unsafe.Pointer(P), unsafe.Pointer(T), unsafe.Pointer(Z))
+    })
+}
+
+func (hikBC *HIKBallCamera) PtzTo(Action int, P, T, Z float32) bool {
+    return hikBC.opt(func() bool {
+        return ptzTo(hikBC.core, Action, P, T, Z)
+    })
+}
+
+func (hikBC *HIKBallCamera) StartBus(Direction, Speed int) bool {
+    return hikBC.opt(func() bool {
+        return startBus(hikBC.core, Direction, Speed)
+    })
+}
+
+func (hikBC *HIKBallCamera) StopBus(Direction int) bool {
+    return hikBC.opt(func() bool {
+        return stopBus(hikBC.core, Direction)
+    })
+}
+
+func (hikBC *HIKBallCamera) OneClickToSeeInFullView(point Point) bool {
+    TransPoint := hikBC.WarpingPtByHomography(hikBC.BallCameraCfg.Matrix.Matrix, point)
+    return hikBC.opt(func() bool {
+        return hikBC.PtzTo(5,
+            float32(hikBC.mapping(hikBC.BallCameraCfg.Matrix.PStart, hikBC.BallCameraCfg.Matrix.PMax, TransPoint.X, hikBC.BallCameraCfg.Matrix.PPositiveDirection, "inv")),
+            float32(hikBC.mapping(hikBC.BallCameraCfg.Matrix.TStart, hikBC.BallCameraCfg.Matrix.TMax, TransPoint.Y, hikBC.BallCameraCfg.Matrix.TPositiveDirection, "inv")),
+            0.0,
+        )
+    })
+
+}
+
+func (hikBC *HIKBallCamera) PTZ2FullView() (Point, error) {
+    var ptz PTZ
+    if !hikBC.opt(func() bool {
+        return hikBC.PTZGet(&ptz.P, &ptz.T, &ptz.Z)
+    }) {
+        return Point{}, fmt.Errorf("PTZ Get Error")
+    }
+    return hikBC.WarpingPtByHomography(hikBC.BallCameraCfg.Matrix.InvMatrix, Point{
+        X: hikBC.mapping(hikBC.BallCameraCfg.Matrix.PStart, hikBC.BallCameraCfg.Matrix.PMax, float64(ptz.P), hikBC.BallCameraCfg.Matrix.PPositiveDirection, ""),
+        Y: hikBC.mapping(hikBC.BallCameraCfg.Matrix.TStart, hikBC.BallCameraCfg.Matrix.TMax, float64(ptz.T), hikBC.BallCameraCfg.Matrix.TPositiveDirection, "")}), nil
+}
+
+func (hikBC *HIKBallCamera) WarpingPtByHomography(matrix []float64, p Point) Point {
+    var x, y, z float64
+    x = matrix[0]*p.X + matrix[1]*p.Y + 1.*matrix[2]
+    y = matrix[3]*p.X + matrix[4]*p.Y + 1.*matrix[5]
+    z = matrix[6]*p.X + matrix[7]*p.Y + 1.*matrix[8]
+
+    x /= z
+    y /= z
+    return Point{X: x, Y: y}
+}
+
+func (hikBC *HIKBallCamera) Invert3x3() bool {
+
+    a := hikBC.BallCameraCfg.Matrix.Matrix[0]
+    b := hikBC.BallCameraCfg.Matrix.Matrix[1]
+    c := hikBC.BallCameraCfg.Matrix.Matrix[2]
+    d := hikBC.BallCameraCfg.Matrix.Matrix[3]
+    e := hikBC.BallCameraCfg.Matrix.Matrix[4]
+    f := hikBC.BallCameraCfg.Matrix.Matrix[5]
+    g := hikBC.BallCameraCfg.Matrix.Matrix[6]
+    h := hikBC.BallCameraCfg.Matrix.Matrix[7]
+    i := hikBC.BallCameraCfg.Matrix.Matrix[8]
+
+    det := a*(e*i-f*h) - b*(d*i-f*g) + c*(d*h-e*g)
+
+    if det == 0 {
+        return false
+    }
+
+    invDet := 1.0 / det
+    hikBC.BallCameraCfg.Matrix.InvMatrix = []float64{
+        (e*i - f*h) * invDet,
+        (c*h - b*i) * invDet,
+        (b*f - c*e) * invDet,
+        (f*g - d*i) * invDet,
+        (a*i - c*g) * invDet,
+        (c*d - a*f) * invDet,
+        (d*h - e*g) * invDet,
+        (b*g - a*h) * invDet,
+        (a*e - b*d) * invDet,
+    }
+    return true
+}
+
+func (hikBC *HIKBallCamera) mapping(startV float64, max float64, value float64, direction string, method string) float64 {
+    if direction == "+" {
+        if method == "inv" {
+            if value > (max - startV) {
+                return value - (max - startV)
+            } else {
+                return startV + value // 映射
+            }
+        } else {
+            if value > startV {
+                return value - startV
+            } else {
+                return (max - startV) + value // 映射
+            }
+        }
+    } else {
+        if value > startV {
+            return startV + max - value
+        } else {
+            return startV - value
+        }
+    }
+}
diff --git a/HikNvr.go b/HikNvr.go
new file mode 100644
index 0000000..2d036c7
--- /dev/null
+++ b/HikNvr.go
@@ -0,0 +1,101 @@
+package HikNetSDK
+
+import (
+    "sync"
+    "unsafe"
+)
+
+type HIKNvr struct {
+    core      unsafe.Pointer
+    State     bool
+    NvrConfig Nvr
+    mux       sync.RWMutex
+}
+
+func NewHIKNvr(nvrConfig Nvr) *HIKNvr {
+    return &HIKNvr{
+        core:      newHIKNvr(),
+        NvrConfig: nvrConfig,
+        State:     false,
+        mux:       sync.RWMutex{},
+    }
+}
+
+func (h *HIKNvr) opt(action func() bool) bool {
+    h.mux.RLock()
+    if h.State {
+        h.mux.RUnlock()
+        h.mux.Lock()
+        h.State = action()
+        h.mux.Unlock()
+    }
+    h.mux.RUnlock()
+    return h.State
+}
+
+func (h *HIKNvr) Login() bool {
+    h.mux.Lock()
+    h.State = initNvr(h.core, h.NvrConfig.Ip, h.NvrConfig.Port, h.NvrConfig.User, h.NvrConfig.Password, h.NvrConfig.Channel)
+    h.mux.Unlock()
+    return h.State
+}
+
+func (h *HIKNvr) CheckTimeRegionWithMonth(year int, month int) string {
+    h.mux.RLock()
+    if h.State {
+        h.mux.RUnlock()
+        if checkTimeRegionWithMonth(h.core, year, month) == "" {
+            h.mux.Lock()
+            h.State = false
+            h.mux.Unlock()
+        } else {
+            h.mux.Lock()
+            h.State = true
+            h.mux.Unlock()
+        }
+    } else {
+        h.mux.RUnlock()
+    }
+    return ""
+}
+
+func (h *HIKNvr) CheckTimeRegionWithDay(year int, month int, day int) string {
+    h.mux.RLock()
+    if h.State {
+        h.mux.RUnlock()
+        data := checkTimeRegionWithDay(h.core, year, month, day)
+        if data == "" {
+            h.mux.Lock()
+            h.State = false
+            h.mux.Unlock()
+        } else {
+            h.mux.Lock()
+            h.State = true
+            h.mux.Unlock()
+            return data
+        }
+    } else {
+        h.mux.RUnlock()
+    }
+    return ""
+}
+func (h *HIKNvr) UTCDiff() int {
+    h.mux.RLock()
+    if h.State {
+        data := nvrUTCDiff(h.core)
+        h.mux.RUnlock()
+        if nvrUTCDiff(h.core) == 500 {
+            h.mux.Lock()
+            h.State = false
+            h.mux.Unlock()
+        } else {
+            h.mux.Lock()
+            h.State = true
+            h.mux.Unlock()
+            return data
+        }
+    } else {
+        h.mux.RUnlock()
+    }
+    return 1000
+}
diff --git a/Hikvision.go b/Hikvision.go
index a3cdb00..d76944b 100644
--- a/Hikvision.go
+++ b/Hikvision.go
@@ -10,7 +10,7 @@ import (
 var libc uintptr
 
 var (
-	DVR_Init func() bool
+	DvrInit func() bool
 
 	newHIKBallCamera func() unsafe.Pointer
 	initBallCamera   func(core unsafe.Pointer, ip string, port string, username string, password string, BallMachineType string) bool
@@ -33,7 +33,7 @@ func init() {
 		panic(err)
 	}
 
-	purego.RegisterLibFunc(&DVR_Init, libc, "DVR_Init")
+	purego.RegisterLibFunc(&DvrInit, libc, "DVR_Init")
 
 	purego.RegisterLibFunc(&newHIKBallCamera, libc, "NewHIKBallCamera")
 	purego.RegisterLibFunc(&initBallCamera, libc, "InitBallCamera")
@@ -64,144 +64,3 @@ func getSystemLibrary() string {
 		panic(fmt.Errorf("GOOS=%s is not supported", runtime.GOOS))
 	}
 }
-
-type HIKBallCamera struct {
-	core          unsafe.Pointer
-	BallCameraCfg BallCamera
-}
-
-func NewHIKBallCamera(BallCameraCfg BallCamera) *HIKBallCamera {
-	return &HIKBallCamera{
-		core:          newHIKBallCamera(),
-		BallCameraCfg: BallCameraCfg,
-	}
-}
-
-func (h *HIKBallCamera) Login() bool {
-	return initBallCamera(h.core, h.BallCameraCfg.Ip, h.BallCameraCfg.Port, h.BallCameraCfg.User, h.BallCameraCfg.Password, h.BallCameraCfg.Type)
-}
-func (h *HIKBallCamera) PtzTo(Action int, P, T, Z float32) bool {
-	return ptzTo(h.core, Action, P, T, Z)
-}
-func (h *HIKBallCamera) PTZGet(P, T, Z *float32) bool {
-	return ptzGet(h.core, unsafe.Pointer(P), unsafe.Pointer(T), unsafe.Pointer(Z))
-}
-func (h *HIKBallCamera) StopBus(Direction int) bool {
-	return stopBus(h.core, Direction)
-}
-func (h *HIKBallCamera) StartBus(Direction, Speed int) bool {
-	return startBus(h.core, Direction, Speed)
-}
-
-type HIKNvr struct {
-	core      unsafe.Pointer
-	NvrConfig Nvr
-}
-
-func NewHIKNvr(nvrConfig Nvr) *HIKNvr {
-	return &HIKNvr{
-		core:      newHIKNvr(),
-		NvrConfig: nvrConfig,
-	}
-}
-
-func (h *HIKNvr) Login() bool {
-	return initNvr(h.core, h.NvrConfig.Ip, h.NvrConfig.Port, h.NvrConfig.User, h.NvrConfig.Password, h.NvrConfig.Channel)
-}
-
-func (h *HIKNvr) CheckTimeRegionWithMonth(year int, month int) string {
-	return checkTimeRegionWithMonth(h.core, year, month)
-}
-func (h *HIKNvr) CheckTimeRegionWithDay(year int, month int, day int) string {
-	return checkTimeRegionWithDay(h.core, year, month, day)
-}
-func (h *HIKNvr) UTCDiff() int {
-	return nvrUTCDiff(h.core)
-}
-
-func (h *HIKBallCamera) WarpingPtByHomography(matrix []float64, p Point) Point {
-	var x, y, z float64
-	x = matrix[0]*p.X + matrix[1]*p.Y + 1.*matrix[2]
-	y = matrix[3]*p.X + matrix[4]*p.Y + 1.*matrix[5]
-	z = matrix[6]*p.X + matrix[7]*p.Y + 1.*matrix[8]
-
-	x /= z
-	y /= z
-	return Point{X: x, Y: y}
-}
-
-func (h *HIKBallCamera) mapping(startV float64, max float64, value float64, direction string, method string) float64 {
-	if direction == "+" {
-		if method == "inv" {
-			if value > (max - startV) {
-				return value - (max - startV)
-			} else {
-				return startV + value // 映射
-			}
-		} else {
-			if value > startV {
-				return value - startV
-			} else {
-				return (max - startV) + value // 映射
-			}
-		}
-	} else {
-		if value > startV {
-			return startV + max - value
-		} else {
-			return startV - value
-		}
-	}
-}
-
-func (h *HIKBallCamera) OneClickToSeeInFullView(point Point) bool {
-	TransPoint := h.WarpingPtByHomography(h.BallCameraCfg.Matrix.Matrix, point)
-	return h.PtzTo(5,
-		float32(h.mapping(h.BallCameraCfg.Matrix.PStart, h.BallCameraCfg.Matrix.PMax, TransPoint.X, h.BallCameraCfg.Matrix.PPositiveDirection, "inv")),
-		float32(h.mapping(h.BallCameraCfg.Matrix.TStart, h.BallCameraCfg.Matrix.TMax, TransPoint.Y, h.BallCameraCfg.Matrix.TPositiveDirection, "inv")),
-		0.0,
-	)
-}
-
-func (h *HIKBallCamera) PTZ2FullView() (Point, error) {
-	var ptz PTZ
-	if !h.PTZGet(&ptz.P, &ptz.T, &ptz.Z) {
-		return Point{}, fmt.Errorf("PTZ Get Error")
-	}
-	return h.WarpingPtByHomography(h.BallCameraCfg.Matrix.InvMatrix, Point{
-		X: h.mapping(h.BallCameraCfg.Matrix.PStart, h.BallCameraCfg.Matrix.PMax, float64(ptz.P), h.BallCameraCfg.Matrix.PPositiveDirection, ""),
-		Y: h.mapping(h.BallCameraCfg.Matrix.TStart, h.BallCameraCfg.Matrix.TMax, float64(ptz.T), h.BallCameraCfg.Matrix.TPositiveDirection, "")}), nil
-}
-
-func (hikBC *HIKBallCamera) Invert3x3() bool {
-
-	a := hikBC.BallCameraCfg.Matrix.Matrix[0]
-	b := hikBC.BallCameraCfg.Matrix.Matrix[1]
-	c := hikBC.BallCameraCfg.Matrix.Matrix[2]
-	d := hikBC.BallCameraCfg.Matrix.Matrix[3]
-	e := hikBC.BallCameraCfg.Matrix.Matrix[4]
-	f := hikBC.BallCameraCfg.Matrix.Matrix[5]
-	g := hikBC.BallCameraCfg.Matrix.Matrix[6]
-	h := hikBC.BallCameraCfg.Matrix.Matrix[7]
-	i := hikBC.BallCameraCfg.Matrix.Matrix[8]
-
-	det := a*(e*i-f*h) - b*(d*i-f*g) + c*(d*h-e*g)
-
-	if det == 0 {
-		return false
-	}
-
-	invDet := 1.0 / det
-	hikBC.BallCameraCfg.Matrix.InvMatrix = []float64{
-		(e*i - f*h) * invDet,
-		(c*h - b*i) * invDet,
-		(b*f - c*e) * invDet,
-		(f*g - d*i) * invDet,
-		(a*i - c*g) * invDet,
-		(c*d - a*f) * invDet,
-		(d*h - e*g) * invDet,
-		(b*g - a*h) * invDet,
-		(a*e - b*d) * invDet,
-	}
-	return true
-}