diff --git a/src/MeoAssistant/AsstCaller.cpp b/src/MeoAssistant/AsstCaller.cpp
index 7dff33cf0d..97a21e1e75 100644
--- a/src/MeoAssistant/AsstCaller.cpp
+++ b/src/MeoAssistant/AsstCaller.cpp
@@ -7,7 +7,6 @@
 
 #include "Assistant.h"
 #include "AsstDef.h"
-#include "AsstUtils.hpp"
 #include "Version.h"
 
 #if 0
@@ -38,7 +37,7 @@ AsstCallback _callback = nullptr;
 
 void CallbackTrans(asst::AsstMsg msg, const json::value& json, void* custom_arg)
 {
-    _callback(static_cast<int>(msg), asst::utils::utf8_to_gbk(json.to_string()).c_str(), custom_arg);
+    _callback(static_cast<int>(msg), json.to_string().c_str(), custom_arg);
 }
 
 asst::Assistant* AsstCreate(const char* dirname)
diff --git a/src/MeoAsstGui/Helper/AsstProxy.cs b/src/MeoAsstGui/Helper/AsstProxy.cs
index 880eae5a7e..1dba26afe9 100644
--- a/src/MeoAsstGui/Helper/AsstProxy.cs
+++ b/src/MeoAsstGui/Helper/AsstProxy.cs
@@ -80,9 +80,29 @@ namespace MeoAsstGui
             tvm.Idle = true;
         }
 
+
+        [DllImport("kernel32.dll", CharSet = CharSet.Ansi, ExactSpelling = true)]
+        internal static extern int lstrlenA(IntPtr ptr);
+
+        private static string PtrToStringCustom(IntPtr ptr, System.Text.Encoding enc)
+        {
+            if (IntPtr.Zero == ptr)
+            {
+                return null;
+            }
+            if (lstrlenA(ptr) == 0)
+            {
+                return string.Empty;
+            }
+            int len = lstrlenA(ptr);
+            Byte[] bytes = new Byte[len + 1];
+            Marshal.Copy(ptr, bytes, 0, len + 1);
+            return enc.GetString(bytes);
+        }
+
         private void CallbackFunction(int msg, IntPtr json_buffer, IntPtr custom_arg)
         {
-            string json_str = Marshal.PtrToStringAnsi(json_buffer);
+            string json_str = PtrToStringCustom(json_buffer, System.Text.Encoding.UTF8);
             //Console.WriteLine(json_str);
             JObject json = (JObject)JsonConvert.DeserializeObject(json_str);
             ProcCallbckMsg dlg = new ProcCallbckMsg(proc_msg);
diff --git a/src/Python/sample.py b/src/Python/sample.py
index ab67d56970..7555af268a 100644
--- a/src/Python/sample.py
+++ b/src/Python/sample.py
@@ -1,6 +1,5 @@
 import json
 import pathlib
-import platform
 
 from interface import Asst, Message
 
@@ -9,18 +8,11 @@ if __name__ == "__main__":
     @Asst.CallBackType
     def my_callback(msg, details, arg):
         m = Message(msg)
-        if platform.system().lower() == 'windows':
-            d = json.loads(details.decode('gbk'))
-        else:
-            d = json.loads(details.decode('utf-8'))
+        d = json.loads(details.decode('utf-8'))
 
         print(m, d, arg)
 
-    if platform.system().lower() == 'windows':
-        dirname: str = (pathlib.Path.cwd().parent.parent / 'x64' / 'Release').__str__()
-    else:
-        dirname: str = (pathlib.Path.cwd().parent.parent / 'build').__str__()
-
+    dirname: str = (pathlib.Path.cwd()).__str__()
     asst = Asst(dirname=dirname, callback=my_callback)
 
     print('version', asst.get_version())