Version 2.3

- Implemented AccountFreeMarginCheck()
- added support for some obsolete MQL4 function : CurTime(), HistoryTotal(), LocalTime()

MQL5/Include/mql4compat.mqh

@@ -150,23 +150,10 @@ ENUM_TIMEFRAMES TFMigrate(int tf)
   }
 
 /* Ask and Bid variables */
-// Predefined Variables
-double __Ask()
-{
-   MqlTick last_tick;
-   SymbolInfoTick(_Symbol,last_tick);
-   return last_tick.ask;
-}  
-
-double __Bid()
-{
-	MqlTick last_tick;
-	SymbolInfoTick(_Symbol,last_tick);
-	return last_tick.bid;
-}
 
-#define Ask   __Ask()
-#define Bid   __Bid()
+// Predefined Variables
+#define Bid (::SymbolInfoDouble(_Symbol, ::SYMBOL_BID))
+#define Ask (::SymbolInfoDouble(_Symbol, ::SYMBOL_ASK))
 
 /* Bars variable */
 double Bars = Bars(_Symbol,_Period);
@@ -232,11 +219,13 @@ double AccountFreeMargin()
 {
    return AccountInfoDouble(ACCOUNT_FREEMARGIN);
 }
-double AccountFreeMarginCheck(string _symbol, int _cmd, double _volume)
+double AccountFreeMarginCheck(const string Symb,const int Cmd,const double dVolume)
 {
-// Unimplemented stub
-Print("Error: AccountFreeMarginCheck() - Not implemented stub.");
-return -1;
+   double Margin;
+
+   return(::OrderCalcMargin((ENUM_ORDER_TYPE)Cmd, Symb, dVolume,
+          ::SymbolInfoDouble(Symb,(Cmd==::ORDER_TYPE_BUY) ? ::SYMBOL_ASK : ::SYMBOL_BID),Margin) ?
+          ::AccountInfoDouble(::ACCOUNT_MARGIN_FREE) - Margin : -1);
 }
 
 double AccountFreeMarginMode()
@@ -762,6 +751,10 @@ int Year()
    TimeCurrent(tm);
    return(tm.year);
 }
+// Obsolete MQL4 function
+#define CurTime() TimeCurrent()
+#define HistoryTotal() OrdersHistoryTotal()
+#define LocalTime() TimeLocal()
 
 //File Functions
 int FileOpenHistory(string filename, int mode, int delimiter=';')

README.md

@@ -26,7 +26,7 @@ This library has covered most of functions except EA trading mechanisms. Also fo
 
 **TODO:** EA trading mechanics for Orders sending and control. Some functions have generic stubs and will give according error messages in log. The return code for those are always **-1**. Meanwhile, you may find it convenient to check the MT4Orders library : https://www.mql5.com/en/code/16006 
 
-**Installation:**
+### Installation
 
 Put mql4compat.mqh in your Include directory (it resides on your Windows user roaming profile).
 
@@ -126,13 +126,15 @@ In indicators the manual tweaks are needed for OnInit() function and #property h
 
 In custom indicators please see how **#property** headers are in MQL5 and then swap input parameters definitions type **extern** to **input**. Also in MQL5 they are now **constants** and any attempt to change values will lead to errors. The fix is by adding temporary variables then copy input parameters values to them instead.
 
+### InitMQL4Env()
 On first line of your base code please add MQL4 reserved variables initialization function (as of version 2.2, only needed if you use MQL4 global variable Bars) :
 
 ```MQL5
 // -- Init MQL4 compatible environment
    InitMQL4Env();
 ```
 
+Using define for Bars would also affect the Bars function. If you know of any trick which would allow to redefine it while keeping the Bars() function available, keep free to send a patch.
 
 ## Changelog
 
@@ -149,6 +151,10 @@ Changelog only kept since version 2.0 ...
 ### Version 2.2
 - InitMQL4Env() unfortunately still needed, but only if you use Bars global variable. 
 
+### Version 2.3
+- Implemented AccountFreeMarginCheck()
+- added support for some obsolete MQL4 function : CurTime(), HistoryTotal(), LocalTime()
+
 ### Credits
 
 ##### Github by Eromawyn (2021)