Require some advice in EA coding - page 2

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Thats the question I've been wanting you to clarify. I DO NOT know the answer to that. The only time I'm able to change the leverage is when I'm signing up for the account. I also know I can change the Leverage for MY BROKER if I visit their website. I've NEVER seen a command in Mql4 called -Change_Leverage- so I'll assume it's Not possible. The way I'm used to controlling risk is to change the Lot size. Maybe someone who know if we could change Leverage size in code could comment. But I don't think so. Also, just to point out, the amount of leverage you could take would depend upon your broker.
 
Margin/leverage should be irreverent. Brokers care about that. You should only care about the risk to your account balance. Risk=(open-SL)*point value
//+------------------------------------------------------------------+
//| Lot size computation.                                            |
//+------------------------------------------------------------------+
double  LotSize(double SLpoints){
/*double    TSSF.value, TEF.value;          // Import from ComputeTSSF
//double    at.risk;                        // Export to init/start/OpenNew */
    /* This function computes the lot size for a trade.
     * Explicit inputs are SL relative to bid/ask (E.G. SL=30*points,)
     * Implicit inputs are the MM mode, the MM multiplier, count currently
     * filled orders by all EA's vs this EA/pair/period count and history.
     * Implicit inputs are all used to reduce available balance the maximum
     * dollar risk allowed. StopLoss determines the maximum dollar risk possible
     * per lot. Lots=maxRisk/maxRiskPerLot
     **************************************************************************/

    /*++++ Compute lot size based on account balance and MM mode*/{
    double  ab  = AccountBalance();
    switch(Money.Management.F0M1G2){
    case MMMODE_FIXED:
        at.risk = Money.Management.Multiplier;
        break;
    case MMMODE_MODERATE:
        // See https://www.mql5.com/en/articles/1526 Fallacies, Part 1: Money
        // Management is Secondary and Not Very Important.       // %used/trade=
        at.risk = MathSqrt(Money.Management.Multiplier * ab)/ab; // ~const rate.
        at.risk = MathSqrt(Money.Management.Multiplier * ab
                            * MathPow( 1 - at.risk, OrdersTotal() ));
        break;
    case MMMODE_GEOMETRICAL:
        at.risk = Money.Management.Multiplier * ab *
                MathPow(1 - Money.Management.Multiplier, OrdersTotal());
        break;
    }
    double  maxLossPerLot   = SLpoints * PointValuePerLot(),
    /* Number of lots wanted = at.risk / maxLossPerLot rounded/truncated to
    /* nearest lotStep size.
    /*
    /* However, the broker doesn't care about the at.risk/account balance. They
    /* care about margin. Margin used=lots used*marginPerLot and that must be
    /* less than free margin available. */
            marginFree      = AccountFreeMargin()*0.95, // Allow some slack
            marginPerLot    = MarketInfo( Symbol(), MODE_MARGINREQUIRED ),
    // So I use, the lesser of either.
            size = MathMin(marginFree / marginPerLot, at.risk / maxLossPerLot);
    /*---- Compute lot size based on account balance and MM mode*/}
    /*++++ Combine TSSF and trade size*/{
    double  minLot  = MarketInfo(Symbol(), MODE_MINLOT);
    if (size < minLot){ // Multiple orders -> no free margin
            // [risk=9.48USD/40.80, margin=10.62/1334.48, MMM=1x1, ExtraOO=0]
            //       0.23                  0.007
        Print(
            "LotSize(SL=", DoubleToStr(SLpoints/pips2dbl, Digits.pips), ")=",
            size, " [risk=", at.risk, AccountCurrency(),    "/", maxLossPerLot,
                    ", margin=",    marginFree,             "/", marginPerLot,
                    ", MMM=",       Money.Management.F0M1G2,"x",
                    Money.Management.Multiplier,
                    ", ExtraOO=",   OrdersTotal(),
                "]" );
        return(0.0);    // Risk limit.
    }
    if (!TSSF.Enable01) double  adjFactTSSF = 1;
    else                        adjFactTSSF = MathMin(1,(TSSF.value-1)/(TSSF.Max-1));
    if (!TEF.Enable01)  double  adjFactTEF  = 1;
    else                        adjFactTEF  = MathMin(1,MathMax(0,TEF.value));
    double  LotStep     = MarketInfo(Symbol(), MODE_LOTSTEP);
    size =  MathMax( minLot
                   , MathFloor(size*adjFactTSSF*adjFactTEF/ LotStep)*LotStep
                   );
    /*---- Combine TSSF and trade size*/}
    at.risk = size * maxLossPerLot; // Export for Comment
    return(size);
}   // LotSize
double PointValuePerLot() { // Value in the account currency of a Point of Symbol.
    /* In tester I had a sale: open=1.35883 close=1.35736 (0.00147)
     * gain$=97.32/6.62 lots/147 points=$0.10/point or $1.00/pip.
     * IBFX demo/mini       EURUSD TICKVALUE=0.1 MAXLOT=50 LOTSIZE=10,000
     * IBFX demo/standard   EURUSD TICKVALUE=1.0 MAXLOT=50 LOTSIZE=100,000
     *                                  $1.00/point or $10.00/pip.
     *
     * https://forum.mql4.com/33975 CB: MODE_TICKSIZE will usually return the
     * same value as MODE_POINT (or Point for the current symbol), however, an
     * example of where to use MODE_TICKSIZE would be as part of a ratio with
     * MODE_TICKVALUE when performing money management calculations which need
     * to take account of the pair and the account currency. The reason I use
     * this ratio is that although TV and TS may constantly be returned as
     * something like 7.00 and 0.00001 respectively, I've seen this
     * (intermittently) change to 14.00 and 0.00002 respectively (just example
     * tick values to illustrate). */
    return(  MarketInfo(Symbol(), MODE_TICKVALUE)
           / MarketInfo(Symbol(), MODE_TICKSIZE) ); // Not Point.
}
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