From 78024a4e32bcfa8647562ccf7db939c7da60d77d Mon Sep 17 00:00:00 2001
From: yanguojin <guojin_yjs@cumt.edu.cn>
Date: Mon, 27 Nov 2023 19:33:47 +0800
Subject: [PATCH] Fix error and return text parsing error.

---
 .../csharp/exception/handle_exception.cs      | 37 ++++++++++---------
 .../csharp/native_methods/ov_common.cs        |  2 +-
 2 files changed, 20 insertions(+), 19 deletions(-)

diff --git a/modules/csharp_api/csharp/exception/handle_exception.cs b/modules/csharp_api/csharp/exception/handle_exception.cs
index 92f2581f7..10805f825 100644
--- a/modules/csharp_api/csharp/exception/handle_exception.cs
+++ b/modules/csharp_api/csharp/exception/handle_exception.cs
@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Runtime.InteropServices;
 using System.Text;
 using System.Threading.Tasks;
 
@@ -100,7 +101,7 @@ public static void handler(ExceptionStatus status) {
         /// </summary>
         /// <exception cref="OVException">general error!</exception>
         private static void general_error() {
-            throw new OVException(ExceptionStatus.GENERAL_ERROR, NativeMethods.ov_get_last_err_msg());
+            throw new OVException(ExceptionStatus.GENERAL_ERROR, Marshal.PtrToStringAnsi(NativeMethods.ov_get_last_err_msg()));
         }
         /// <summary>
         /// Throw NOT_IMPLEMENTED OpenVINOException.
@@ -108,7 +109,7 @@ private static void general_error() {
         /// <exception cref="OVException">not implemented!</exception>
         private static void not_implemented()
         {
-            throw new OVException(ExceptionStatus.NOT_IMPLEMENTED, NativeMethods.ov_get_last_err_msg());
+            throw new OVException(ExceptionStatus.NOT_IMPLEMENTED, Marshal.PtrToStringAnsi(NativeMethods.ov_get_last_err_msg()));
         }
 
         /// <summary>
@@ -117,7 +118,7 @@ private static void not_implemented()
         /// <exception cref="OVException">network not loaded!</exception>
         private static void network_not_loaded()
         {
-            throw new OVException(ExceptionStatus.NETWORK_NOT_LOADED, NativeMethods.ov_get_last_err_msg());
+            throw new OVException(ExceptionStatus.NETWORK_NOT_LOADED, Marshal.PtrToStringAnsi(NativeMethods.ov_get_last_err_msg()));
         }
 
 
@@ -127,7 +128,7 @@ private static void network_not_loaded()
         /// <exception cref="OVException">parameter mismatch!</exception>
         private static void parameter_mismatch()
         {
-            throw new OVException(ExceptionStatus.PARAMETER_MISMATCH, NativeMethods.ov_get_last_err_msg());
+            throw new OVException(ExceptionStatus.PARAMETER_MISMATCH, Marshal.PtrToStringAnsi(NativeMethods.ov_get_last_err_msg()));
         }
 
         /// <summary>
@@ -136,7 +137,7 @@ private static void parameter_mismatch()
         /// <exception cref="OVException">not found!</exception>
         private static void not_found()
         {
-            throw new OVException(ExceptionStatus.NOT_FOUND, NativeMethods.ov_get_last_err_msg());
+            throw new OVException(ExceptionStatus.NOT_FOUND, Marshal.PtrToStringAnsi(NativeMethods.ov_get_last_err_msg()));
         }
 
         /// <summary>
@@ -145,7 +146,7 @@ private static void not_found()
         /// <exception cref="OVException">out of bounds!</exception>
         private static void out_of_bounds()
         {
-            throw new OVException(ExceptionStatus.OUT_OF_BOUNDS, NativeMethods.ov_get_last_err_msg());
+            throw new OVException(ExceptionStatus.OUT_OF_BOUNDS, Marshal.PtrToStringAnsi(NativeMethods.ov_get_last_err_msg()));
         }
 
 
@@ -155,7 +156,7 @@ private static void out_of_bounds()
         /// <exception cref="OVException">unexpection!</exception>
         private static void unexpection()
         {
-            throw new OVException(ExceptionStatus.UNEXPECTED, NativeMethods.ov_get_last_err_msg());
+            throw new OVException(ExceptionStatus.UNEXPECTED, Marshal.PtrToStringAnsi(NativeMethods.ov_get_last_err_msg()));
         }
 
 
@@ -166,7 +167,7 @@ private static void unexpection()
         /// <exception cref="OVException">request busy!</exception>
         private static void request_busy()
         {
-            throw new OVException(ExceptionStatus.REQUEST_BUSY, NativeMethods.ov_get_last_err_msg());
+            throw new OVException(ExceptionStatus.REQUEST_BUSY, Marshal.PtrToStringAnsi(NativeMethods.ov_get_last_err_msg()));
         }
         /// <summary>
         /// Throw RESULT_NOT_READY OpenVINOException.
@@ -174,7 +175,7 @@ private static void request_busy()
         /// <exception cref="OVException">result not ready!</exception>
         private static void result_not_ready()
         {
-            throw new OVException(ExceptionStatus.RESULT_NOT_READY, NativeMethods.ov_get_last_err_msg());
+            throw new OVException(ExceptionStatus.RESULT_NOT_READY, Marshal.PtrToStringAnsi(NativeMethods.ov_get_last_err_msg()));
         }
         /// <summary>
         /// Throw OpenVINOException.
@@ -182,7 +183,7 @@ private static void result_not_ready()
         /// <exception cref="OVException">not allocated!</exception>
         private static void not_allocated()
         {
-            throw new OVException(ExceptionStatus.NOT_ALLOCATED, NativeMethods.ov_get_last_err_msg());
+            throw new OVException(ExceptionStatus.NOT_ALLOCATED, Marshal.PtrToStringAnsi(NativeMethods.ov_get_last_err_msg()));
         }
         /// <summary>
         /// Throw INFER_NOT_STARTED OpenVINOException.
@@ -190,7 +191,7 @@ private static void not_allocated()
         /// <exception cref="OVException">infer not started!</exception>
         private static void infer_not_started()
         {
-            throw new OVException(ExceptionStatus.INFER_NOT_STARTED, NativeMethods.ov_get_last_err_msg());
+            throw new OVException(ExceptionStatus.INFER_NOT_STARTED, Marshal.PtrToStringAnsi(NativeMethods.ov_get_last_err_msg()));
         }
         /// <summary>
         /// Throw NETWORK_NOT_READ OpenVINOException.
@@ -198,7 +199,7 @@ private static void infer_not_started()
         /// <exception cref="OVException">netword not read!</exception>
         private static void netword_not_read()
         {
-            throw new OVException(ExceptionStatus.NETWORK_NOT_READ, NativeMethods.ov_get_last_err_msg());
+            throw new OVException(ExceptionStatus.NETWORK_NOT_READ, Marshal.PtrToStringAnsi(NativeMethods.ov_get_last_err_msg()));
         }
         /// <summary>
         /// Throw INFER_CANCELLED OpenVINOException.
@@ -206,7 +207,7 @@ private static void netword_not_read()
         /// <exception cref="OVException">infer cancelled!</exception>
         private static void infer_cancelled()
         {
-            throw new OVException(ExceptionStatus.INFER_CANCELLED, NativeMethods.ov_get_last_err_msg());
+            throw new OVException(ExceptionStatus.INFER_CANCELLED, Marshal.PtrToStringAnsi(NativeMethods.ov_get_last_err_msg()));
         }
         /// <summary>
         /// Throw INVALID_C_PARAM OpenVINOException.
@@ -214,7 +215,7 @@ private static void infer_cancelled()
         /// <exception cref="OVException">invalid c param!</exception>
         private static void invalid_c_param()
         {
-            throw new OVException(ExceptionStatus.INVALID_C_PARAM, NativeMethods.ov_get_last_err_msg());
+            throw new OVException(ExceptionStatus.INVALID_C_PARAM, Marshal.PtrToStringAnsi(NativeMethods.ov_get_last_err_msg()));
         }
         /// <summary>
         /// Throw UNKNOWN_C_ERROR OpenVINOException.
@@ -222,7 +223,7 @@ private static void invalid_c_param()
         /// <exception cref="OVException">unknown c error!</exception>
         private static void unknown_c_error()
         {
-            throw new OVException(ExceptionStatus.UNKNOWN_C_ERROR, NativeMethods.ov_get_last_err_msg());
+            throw new OVException(ExceptionStatus.UNKNOWN_C_ERROR, Marshal.PtrToStringAnsi(NativeMethods.ov_get_last_err_msg()));
         }
         /// <summary>
         /// Throw NOT_IMPLEMENT_C_METHOD OpenVINOException.
@@ -230,7 +231,7 @@ private static void unknown_c_error()
         /// <exception cref="OVException">not implement c method!</exception>
         private static void not_implement_c_method()
         {
-            throw new OVException(ExceptionStatus.NOT_IMPLEMENT_C_METHOD, NativeMethods.ov_get_last_err_msg());
+            throw new OVException(ExceptionStatus.NOT_IMPLEMENT_C_METHOD, Marshal.PtrToStringAnsi(NativeMethods.ov_get_last_err_msg()));
         }
         /// <summary>
         /// Throw UNKNOW_EXCEPTION OpenVINOException.
@@ -238,7 +239,7 @@ private static void not_implement_c_method()
         /// <exception cref="OVException">unknown exception!</exception>
         private static void unknown_exception()
         {
-            throw new OVException(ExceptionStatus.UNKNOW_EXCEPTION, NativeMethods.ov_get_last_err_msg());
+            throw new OVException(ExceptionStatus.UNKNOW_EXCEPTION, Marshal.PtrToStringAnsi(NativeMethods.ov_get_last_err_msg()));
         }
         /// <summary>
         /// Throw PTR_NULL OpenVINOException.
@@ -246,7 +247,7 @@ private static void unknown_exception()
         /// <exception cref="OVException"></exception>
         private static void ptr_null_exception()
         {
-            throw new OVException(ExceptionStatus.UNKNOW_EXCEPTION, NativeMethods.ov_get_last_err_msg());
+            throw new OVException(ExceptionStatus.UNKNOW_EXCEPTION, Marshal.PtrToStringAnsi(NativeMethods.ov_get_last_err_msg()));
         }
     }
 }
diff --git a/modules/csharp_api/csharp/native_methods/ov_common.cs b/modules/csharp_api/csharp/native_methods/ov_common.cs
index 9e4bf2711..0a0ff31e7 100644
--- a/modules/csharp_api/csharp/native_methods/ov_common.cs
+++ b/modules/csharp_api/csharp/native_methods/ov_common.cs
@@ -33,6 +33,6 @@ public partial class NativeMethods
         /// <returns>The last error msg.</returns>
         [DllImport(dll_extern, EntryPoint = "ov_get_last_err_msg",
             CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl)]
-        public extern static string ov_get_last_err_msg();
+        public extern static IntPtr ov_get_last_err_msg();
     }
 }