diff --git a/README.md b/README.md
index 4e868d3..d578087 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 
-3.9.2.23 测试版，临时测试
+##  3.9.2.23版本，预览功能没有的接口，不能使用，文档仅供参考。
 #### 功能预览：
 0.检查是否登录     
 1.获取登录微信信息  
@@ -36,8 +36,8 @@
 52.群消息取消置顶   -->
 53.朋友圈首页
 54.朋友圈下一页  
-<!-- 55.获取联系人或者群名称    
-56.获取消息附件(图片，视频，文件)  -->
+<!-- 55.获取联系人或者群名称     -->
+56.获取消息附件(图片，视频，文件) 
 ### 接口文档：
 
 
@@ -107,6 +107,7 @@
 |province|string|省|
 |wxid|string|wxid|
 |signature|string|个人签名|
+|dbKey|string|数据库的SQLCipher的加密key，可以使用该key配合decrypt.py解密数据库
 
 ###### 接口示例
 入参：
@@ -114,7 +115,7 @@
 ```
 响应：
 ``` javascript
-{"code":1,"data":{"account":"xx","headImage":"https://wx.qlogo.cn/mmhead/ver_1xx","city":"xx","country":"CN","currentDataPath":"C:\\xx\\wxid_xxxxx","dataSavePath":"C:\\xx","mobie":"13812345678","name":"xx","province":"xx","signature":"xx","wxid":"xx"},"result":"OK"}
+{"code":1,"data":{"account":"xx","headImage":"https://wx.qlogo.cn/mmhead/ver_1xx","city":"xx","country":"CN","currentDataPath":"C:\\xx\\wxid_xxxxx","dataSavePath":"C:\\xx","mobie":"13812345678","name":"xx","province":"xx","signature":"xx","wxid":"xx","dbKey":"aaa2222"},"result":"OK"}
 ```
 
 
diff --git a/src/api.cc b/src/api.cc
index 7543187..0e3da12 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -244,6 +244,7 @@ void api_handle(mg_http_message *hm, struct mg_connection *c, string &ret) {
       break;
     }
     case WECHAT_MSG_SEND_AT: {
+      break;
       wstring chat_room_id = get_http_req_param(hm, j_param, "chatRoomId", is_post);
       vector<wstring> wxids = get_http_param_array(hm, j_param, "wxids", is_post);
       wstring msg = get_http_req_param(hm, j_param, "msg", is_post);
@@ -299,6 +300,7 @@ void api_handle(mg_http_message *hm, struct mg_connection *c, string &ret) {
       break;
     }
     case WECHAT_MSG_START_IMAGE_HOOK: {
+      break;
       wstring img_dir = get_http_req_param(hm, j_param, "imgDir", is_post);
       int success = HookImg(img_dir);
       json ret_data = {{"code", success}, {"result", "OK"}};
@@ -306,6 +308,7 @@ void api_handle(mg_http_message *hm, struct mg_connection *c, string &ret) {
       break;
     }
     case WECHAT_MSG_STOP_IMAGE_HOOK: {
+      break;
       int success = UnHookImg();
       json ret_data = {{"code", success}, {"result", "OK"}};
       ret = ret_data.dump();
@@ -332,6 +335,7 @@ void api_handle(mg_http_message *hm, struct mg_connection *c, string &ret) {
       break;
     }
     case WECHAT_CONTACT_DEL: {
+      break;
       wstring user_id = get_http_req_param(hm, j_param, "wxid", is_post);
       int success = DelContact(WS2LW(user_id));
       json ret_data = {{"code", success}, {"result", "OK"}};
@@ -342,6 +346,7 @@ void api_handle(mg_http_message *hm, struct mg_connection *c, string &ret) {
       break;
     }
     case WECHAT_CONTACT_SEARCH_BY_NET: {
+      break;
       wstring keyword = get_http_req_param(hm, j_param, "keyword", is_post);
       UserInfo *user = nullptr;
       int success = SearchContactNetScene(WS2LW(keyword), &user);
@@ -365,6 +370,7 @@ void api_handle(mg_http_message *hm, struct mg_connection *c, string &ret) {
       break;
     }
     case WECHAT_CONTACT_ADD_BY_WXID: {
+      break;
       wstring user_id = get_http_req_param(hm, j_param, "wxid", is_post);
       int success = AddFriendByWxid(WS2LW(user_id));
       json ret_data = {{"code", success}, {"result", "OK"}};
@@ -400,6 +406,7 @@ void api_handle(mg_http_message *hm, struct mg_connection *c, string &ret) {
       break;
     }
     case WECHAT_CHATROOM_GET_MEMBER_NICKNAME: {
+      break;
       wstring room_id = get_http_req_param(hm, j_param, "chatRoomId", is_post);
       wstring member_id = get_http_req_param(hm, j_param, "memberId", is_post);
       
@@ -409,6 +416,7 @@ void api_handle(mg_http_message *hm, struct mg_connection *c, string &ret) {
       break;
     }
     case WECHAT_CHATROOM_DEL_MEMBER: {
+      break;
       wstring room_id = get_http_req_param(hm, j_param, "chatRoomId", is_post);
       vector<wstring> wxids = get_http_param_array(hm, j_param, "memberIds", is_post);
       vector<wchar_t *> wxid_list;
@@ -421,6 +429,7 @@ void api_handle(mg_http_message *hm, struct mg_connection *c, string &ret) {
       break;
     }
     case WECHAT_CHATROOM_ADD_MEMBER: {
+      break;
       wstring room_id = get_http_req_param(hm, j_param, "chatRoomId", is_post);
       vector<wstring> wxids = get_http_param_array(hm, j_param, "memberIds", is_post);
       vector<wchar_t *> wxid_list;
@@ -439,6 +448,7 @@ void api_handle(mg_http_message *hm, struct mg_connection *c, string &ret) {
       break;
     }
     case WECHAT_CHATROOM_SET_SELF_NICKNAME: {
+      break;
       wstring room_id = get_http_req_param(hm, j_param, "chatRoomId", is_post);
       wstring wxid = get_http_req_param(hm, j_param, "wxid", is_post);
       wstring nick = get_http_req_param(hm, j_param, "nickName", is_post);
@@ -496,12 +506,14 @@ void api_handle(mg_http_message *hm, struct mg_connection *c, string &ret) {
       break;
     }
     case WECHAT_LOG_START_HOOK: {
+      break;
       int success = HookLog();
       json ret_data = {{"code", success}, {"result", "OK"}};
       ret = ret_data.dump();
       break;
     }
     case WECHAT_LOG_STOP_HOOK: {
+      break;
       int success = UnHookLog();
       json ret_data = {{"code", success}, {"result", "OK"}};
       ret = ret_data.dump();
@@ -537,6 +549,7 @@ void api_handle(mg_http_message *hm, struct mg_connection *c, string &ret) {
       break;
     }
     case WECHAT_GET_TRANSFER: {
+      break;
       wstring wxid = get_http_req_param(hm, j_param, "wxid", is_post);
       wstring transcationid = get_http_req_param(hm, j_param, "transcationId", is_post);
       wstring transferid = get_http_req_param(hm, j_param, "transferId", is_post);
@@ -583,6 +596,7 @@ void api_handle(mg_http_message *hm, struct mg_connection *c, string &ret) {
       break;
     }
     case WECHAT_GET_CHATROOM_INFO: {
+      break;
       wstring room_id = get_http_req_param(hm, j_param, "chatRoomId", is_post);
       ChatRoomInfoInner chat_room_detail{0};
       int success = GetChatRoomDetailInfo(WS2LW(room_id), chat_room_detail);
@@ -618,6 +632,7 @@ void api_handle(mg_http_message *hm, struct mg_connection *c, string &ret) {
       break;
     }
     case  WECHAT_DO_OCR:{
+      break;
       wstring image_path = get_http_req_param(hm, j_param, "imagePath", is_post);
       string text("");
       int success = DoOCRTask(WS2LW(image_path),text);
@@ -634,6 +649,7 @@ void api_handle(mg_http_message *hm, struct mg_connection *c, string &ret) {
       break;
     }
     case WECHAT_SET_TOP_MSG:{
+      break;
       wstring wxid = get_http_req_param(hm, j_param, "wxid", is_post);
       ULONG64 msgid = get_http_param_ulong64(hm, j_param, "msgid", is_post);
       int success = SetTopMsg(WS2LW(wxid),msgid);
@@ -642,6 +658,7 @@ void api_handle(mg_http_message *hm, struct mg_connection *c, string &ret) {
       break;
     }
     case WECHAT_REMOVE_TOP_MSG:{
+      break;
       wstring room_id = get_http_req_param(hm, j_param, "chatRoomId", is_post);
       ULONG64 msgid = get_http_param_ulong64(hm, j_param, "msgid", is_post);
       int success = RemoveTopMsg(WS2LW(room_id),msgid);
@@ -663,6 +680,7 @@ void api_handle(mg_http_message *hm, struct mg_connection *c, string &ret) {
       break;
     }
     case WECHAT_CONTACT_NAME:{
+      break;
       wstring pri_id = get_http_req_param(hm, j_param, "id", is_post);
       wstring name =GetContactOrChatRoomNickname(WS2LW(pri_id));
       json ret_data = {{"code", 1}, {"result", "OK"},{"name",unicode_to_utf8(WS2LW(name))}};
diff --git a/src/download.cc b/src/download.cc
index f22a6d0..d3d5182 100644
--- a/src/download.cc
+++ b/src/download.cc
@@ -6,20 +6,20 @@
 
 #include "wechat_data.h"
 
-#define WX_NEW_CHAT_MSG_OFFSET 0x70e2a0
-#define WX_GET_PRE_DOWNLOAD_MGR_OFFSET 0x7ae310
-#define WX_PUSH_ATTACH_TASK_OFFSET 0x7c94a0
-#define WX_FREE_CHAT_MSG_INSTANCE_COUNTER_OFFSET 0x6f5370
-#define WX_FREE_CHAT_MSG_OFFSET 0x6f4ea0
-#define WX_CHAT_MGR_OFFSET 0x732660
-#define WX_GET_MGR_BY_PREFIX_LOCAL_ID_OFFSET 0xb54950
-#define WX_GET_CURRENT_DATA_PATH_OFFSET 0xc11140
-#define WX_APP_MSG_INFO_OFFSET 0x7571d0
-#define WX_GET_APP_MSG_XML_OFFSET 0xddef80
-#define WX_FREE_APP_MSG_INFO_OFFSET 0x73d820
-#define WX_PUSH_THUMB_TASK_OFFSET 0x7c93a0
-#define WX_VIDEO_MGR_OFFSET 0x7c7300
-#define WX_DOWNLOAD_VIDEO_IMG_OFFSET 0xcc6d80
+#define WX_NEW_CHAT_MSG_OFFSET 0x76f010
+#define WX_GET_PRE_DOWNLOAD_MGR_OFFSET 0x80f110
+#define WX_PUSH_ATTACH_TASK_OFFSET 0x82bb40
+#define WX_FREE_CHAT_MSG_INSTANCE_COUNTER_OFFSET 0x756e30
+#define WX_FREE_CHAT_MSG_OFFSET 0x756960
+#define WX_CHAT_MGR_OFFSET 0x792700
+#define WX_GET_MGR_BY_PREFIX_LOCAL_ID_OFFSET 0xbc0370
+#define WX_GET_CURRENT_DATA_PATH_OFFSET 0xc872c0
+#define WX_APP_MSG_INFO_OFFSET 0x7b3d20
+#define WX_GET_APP_MSG_XML_OFFSET 0xe628a0
+#define WX_FREE_APP_MSG_INFO_OFFSET 0x79d900
+#define WX_PUSH_THUMB_TASK_OFFSET 0x82ba40
+#define WX_VIDEO_MGR_OFFSET 0x829820
+#define WX_DOWNLOAD_VIDEO_IMG_OFFSET 0xd46c30
 
 using namespace std;
 
@@ -31,7 +31,7 @@ int DoDownloadTask(ULONG64 msg_id) {
     return -2;
   }
 
-  char chat_msg[0x2C4] = {0};
+  char chat_msg[0x2D8] = {0};
   DWORD base = GetWeChatWinBase();
   DWORD new_chat_msg_addr = base + WX_NEW_CHAT_MSG_OFFSET;
   DWORD get_chat_mgr_addr = base + WX_CHAT_MGR_OFFSET;
@@ -143,7 +143,7 @@ int DoDownloadTask(ULONG64 msg_id) {
   int temp =1;
   memcpy(&chat_msg[0x19C], &w_thumb_path, sizeof(w_thumb_path));
   memcpy(&chat_msg[0x1B0], &w_save_path, sizeof(w_save_path));
-  memcpy(&chat_msg[0x290], &temp, sizeof(temp));
+  memcpy(&chat_msg[0x29C], &temp, sizeof(temp));
   // note： the image has been downloaded and will not be downloaded again
   // use low-level method  
   // this function does not work, need to modify chatmsg.