diff --git a/c_wrapper/build_dll.bat b/c_wrapper/build_dll.bat
index a514873..b675feb 100644
--- a/c_wrapper/build_dll.bat
+++ b/c_wrapper/build_dll.bat
@@ -1,2 +1,2 @@
-go build -buildmode=c-shared  -trimpath -ldflags="-s -w"  -o openimsdk.dll  export.go constant.go protocol.go
+go build -buildmode=c-shared  -trimpath -ldflags="-s -w"  -o openimsdk.dll  export.go constant.go protocol.go tools.go
 
diff --git a/c_wrapper/export.go b/c_wrapper/export.go
index 5bd82a8..661c265 100644
--- a/c_wrapper/export.go
+++ b/c_wrapper/export.go
@@ -2,10 +2,10 @@ package main
 
 /*
 #include <stdio.h>
-typedef void (*CB_I_I_S)(int,int,char *);
+typedef void (*CB_I_S)(int,char *);
 typedef void (*CB_I_S_S)(int,char *,char *);
 typedef void (*CB_I_S_S_I)(int,char *,char *,int);
-extern void Call_CB_I_I_S(CB_I_I_S func,int event,int errCode,char* errMsg);
+extern void Call_CB_I_S(CB_I_S func,int event,char* data);
 extern void Call_CB_I_S_S(CB_I_S_S func,int errCode,char* errMsg,char* data);
 extern void Call_CB_I_S_S_I(CB_I_S_S_I func,int errCode,char* errMsg,char* data,int progress);
 */
@@ -15,33 +15,38 @@ import (
 	"open_im_sdk/open_im_sdk"
 )
 
+type Base struct {
+	ErrCode int32  `json:"errCode"`
+	ErrMsg  string `json:"errMsg"`
+}
 type ConnCallback struct {
-	cCallback C.CB_I_I_S
+	cCallback C.CB_I_S
 }
 
-func NewConnCallback(cCallback C.CB_I_I_S) *ConnCallback {
+func NewConnCallback(cCallback C.CB_I_S) *ConnCallback {
 	return &ConnCallback{cCallback: cCallback}
 }
 
 func (c ConnCallback) OnConnecting() {
-	C.Call_CB_I_I_S(c.cCallback, CONNECTING, NO_ERR, NO_ERR_MSG)
+	C.Call_CB_I_S(c.cCallback, CONNECTING, NO_DATA)
 }
 
 func (c ConnCallback) OnConnectSuccess() {
-	C.Call_CB_I_I_S(c.cCallback, CONNECT_SUCCESS, NO_ERR, NO_ERR_MSG)
+	C.Call_CB_I_S(c.cCallback, CONNECT_SUCCESS, NO_DATA)
 }
 
 func (c ConnCallback) OnConnectFailed(errCode int32, errMsg string) {
-	C.Call_CB_I_I_S(c.cCallback, CONNECT_FAILED, C.int(errCode), C.CString(errMsg))
+
+	C.Call_CB_I_S(c.cCallback, CONNECT_FAILED, C.CString(StructToJsonString(Base{ErrCode: errCode, ErrMsg: errMsg})))
 
 }
 
 func (c ConnCallback) OnKickedOffline() {
-	C.Call_CB_I_I_S(c.cCallback, KICKED_OFFLINE, NO_ERR, NO_ERR_MSG)
+	C.Call_CB_I_S(c.cCallback, KICKED_OFFLINE, NO_DATA)
 }
 
 func (c ConnCallback) OnUserTokenExpired() {
-	C.Call_CB_I_I_S(c.cCallback, USER_TOKEN_EXPIRED, NO_ERR, NO_ERR_MSG)
+	C.Call_CB_I_S(c.cCallback, USER_TOKEN_EXPIRED, NO_DATA)
 }
 
 type SendMessageCallback struct {
@@ -82,7 +87,7 @@ func (b BaseCallback) OnSuccess(data string) {
 
 //export  init_sdk
 func init_sdk(
-	cCallback C.CB_I_I_S,
+	cCallback C.CB_I_S,
 	operationID *C.char, config *C.char) bool {
 	callback := NewConnCallback(cCallback)
 	return open_im_sdk.InitSDK(callback, C.GoString(operationID), C.GoString(config))
diff --git a/c_wrapper/protocol.go b/c_wrapper/protocol.go
index 9d985ca..018f72d 100644
--- a/c_wrapper/protocol.go
+++ b/c_wrapper/protocol.go
@@ -2,14 +2,14 @@ package main
 
 /*
 #include <stdio.h>
-typedef void (*CB_I_I_S)(int,int,char *);
+typedef void (*CB_I_S)(int,char *);
 typedef void (*CB_I_S_S)(int,char *,char *);
 typedef void (*CB_I_S_S_I)(int,char *,char *,int);
 
 __attribute__((weak))
-void Call_CB_I_I_S(CB_I_I_S func,int event,int errCode,char* errMsg)
+void Call_CB_I_S(CB_I_S func,int event,char* data)
 {
-    func(event,errCode,errMsg);
+    func(event,data);
 }
 __attribute__((weak))
 void Call_CB_I_S_S(CB_I_S_S func,int errCode,char* errMsg,char* data)
diff --git a/c_wrapper/tools.go b/c_wrapper/tools.go
index f63c39e..d282f49 100644
--- a/c_wrapper/tools.go
+++ b/c_wrapper/tools.go
@@ -1,5 +1,13 @@
 package main
 
+import "encoding/json"
+
 func parseBool() bool {
 	return false
 }
+
+func StructToJsonString(param interface{}) string {
+	dataType, _ := json.Marshal(param)
+	dataString := string(dataType)
+	return dataString
+}