Add errcode header

jsonfail.cpp

@@ -0,0 +1,28 @@
+#include "jsonfail.h"
+
+const char* GetErrMsg(int errcode)
+{
+    switch(errcode)
+    {
+    case err_need_login:
+        return "Please login first";
+    case err_method_not_supported:
+        return "Request Method not supported";
+    case err_missing_parameter:
+        return "Missing Parameter";
+    case err_config:
+        return "Failed to read configure";
+    case err_connect:
+        return "Failed to connect DB";
+    case err_sql:
+        return "Failed to execute SQL";
+    case err_sql_logic:
+        return "SQL Logical Error";
+    case err_permission_denied:
+        return "Permission denied";
+    case err_data:
+        return "Data Error";
+    default:
+        return "General error";
+    }
+}

jsonfail.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#define err_need_login 1
+#define err_method_not_supported 2
+#define err_missing_parameter 3
+#define err_config 4
+#define err_connect 5
+#define err_sql 6
+#define err_sql_logic 7
+#define err_permission_denied 8
+#define err_data 9
+
+const char* GetErrMsg(int errcode);