Issue #35: Implemented function TerminalInfoDouble in MtApi MT4

MtApi/EnumTerminalInfoDouble.cs

@@ -0,0 +1,8 @@
+namespace MtApi
+{
+    // https://docs.mql4.com/constants/environment_state/terminalstatus#enum_terminal_info_double
+    public enum EnumTerminalInfoDouble
+    {
+        TERMINAL_COMMUNITY_BALANCE  = 25 // Balance in MQL5.community
+    }
+}

MtApi/MtApi.csproj

@@ -62,6 +62,7 @@
     <Compile Include="EnumSeriesInfoInteger.cs" />
     <Compile Include="EnumSymbolInfoDouble.cs" />
     <Compile Include="EnumSymbolInfoInteger.cs" />
+    <Compile Include="EnumTerminalInfoDouble.cs" />
     <Compile Include="EnumTerminalInfoInteger.cs" />
     <Compile Include="ExtensionMethods.cs" />
     <Compile Include="Monitors\AvailabilityOrdersEventArgs.cs" />

MtApi/MtApiClient.cs

@@ -683,7 +683,18 @@ namespace MtApi
             return SendCommand<int>(MtCommandType.TerminalInfoInteger, commandParameters);
         }
 
-        //TODO: TerminalInfoDouble
+        ///<summary>
+        ///Returns the value of a corresponding property of the mql4 program environment.
+        ///</summary>
+        ///<param name="propertyId">Identifier of a property. Can be one of the values of the ENUM_TERMINAL_INFO_DOUBLE enumeration.</param>
+        ///<returns>
+        ///Value of double type.
+        ///</returns>
+        public double TerminalInfoDouble(EnumTerminalInfoDouble propertyId)
+        {
+            var commandParameters = new ArrayList { (int)propertyId };
+            return SendCommand<double>(MtCommandType.TerminalInfoDouble, commandParameters);
+        }
 
         ///<summary>
         ///Returns the name of company owning the client terminal.

MtApi/MtCommandType.cs

@@ -63,7 +63,7 @@ namespace MtApi
         TerminalPath                        = 70,
         TerminalInfoString                  = 153,
         TerminalInfoInteger                 = 204,
-        //TerminalInfoDouble                  = 205,
+        TerminalInfoDouble                  = 205,
 
         //Account Information
         AccountBalance = 40,