问题
so I make some coding and now have empty buffer I want to ask how to feel EMPTY_BUFFER so if use IF line == EMPTY BUFFER then FILL IT..i already try some coding but still not fill the empty buffer
#property strict
#property indicator_level1 75.0
#property indicator_level2 25.0
#property indicator_levelcolor LimeGreen
#property indicator_levelwidth 1
#property indicator_levelstyle 0
#property indicator_separate_window
#property indicator_buffers 5
#property indicator_color1 Green
#property indicator_color2 Red
#property indicator_color3 Blue
#property indicator_color4 Green
#property indicator_color5 Red
extern string howtouse= "scalping in m5";
extern string contact = "reiz_gamer@yahoo.co.id";
extern string created = "created by reza rahmad";
extern int barsToProcess=100;
double ExtMapBuffer1[];
double ExtMapBuffer2[];
double ExtMapBuffer3[];
double buy[];
double sell[];
int values;
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
int OnInit()
{
//---
SetIndexStyle(0,DRAW_LINE);
SetIndexBuffer(0,ExtMapBuffer1);
SetIndexStyle(1,DRAW_LINE);
SetIndexBuffer(1,ExtMapBuffer2);
SetIndexStyle(2,DRAW_LINE);
SetIndexBuffer(2,ExtMapBuffer3);
SetIndexStyle(3,DRAW_NONE);
SetIndexBuffer(3,buy);
SetIndexEmptyValue(3,0.0);
SetIndexStyle(4,DRAW_ARROW,EMPTY,3,Magenta);
SetIndexArrow(4,234);
SetIndexBuffer(4,sell);
SetIndexEmptyValue(4,0.0);
// initialization of the generator of random numbers
ObjectCreate("sig",OBJ_TEXT,0,0,0,0,0);
ObjectSetText("sig","TAHAN",10,"Times New Roman",Magenta);
ObjectCreate("sig1",OBJ_LABEL,0,0,0,0,0);
ObjectSet("sig1",OBJPROP_XDISTANCE,750);
ObjectSet("sig1",OBJPROP_YDISTANCE,20);
ObjectSetText("sig1","created by reza rahmad scalping use in tf 5m",10,"Times New Roman",Magenta);
//---
return(0);
}
//+------------------------------------------------------------------+
//| Custom indicator iteration function |
//+------------------------------------------------------------------+
int deinit()
{
ObjectDelete("tare");
ObjectDelete("tarmid");
ObjectDelete("tare1");
ObjectDelete("sig");
ObjectDelete("sig1");
return(0);
}
//+------------------------------------------------------------------+
//| |
//+------------------------------------------------------------------+
int start()
{
int counted_bars=IndicatorCounted(),
limit;
if(counted_bars>0)
counted_bars--;
limit=Bars-counted_bars;
if(limit>barsToProcess)
limit=barsToProcess;
for(int i=0;i<limit;i++)
{
double main5 = iStochastic( NULL, PERIOD_M5, 14, 3, 3, MODE_SMMA, 0, MODE_MAIN, i );
double signal5 = iStochastic( NULL, PERIOD_M5, 14, 3, 3, MODE_SMMA, 0, MODE_SIGNAL, i );
double ma20 = iMA( NULL, PERIOD_M5, 20, 0, MODE_SMA, PRICE_CLOSE, 0 );
double ma5 = iMA( NULL, PERIOD_M5, 5, 0, MODE_SMA, PRICE_CLOSE, 0 );
ExtMapBuffer1[i] = EMPTY_VALUE;
ExtMapBuffer2[i] = EMPTY_VALUE;
if ( main5 > signal5
&& High[0] > ma5
){
ExtMapBuffer1[i] = ( ( Close[i+1] + Close[i] ) / 2 );
values = 1;
}
if ( main5 < signal5
&& Low[0] < ma5
){
ExtMapBuffer2[i] = ( ( Close[i+1] + Close[i] ) / 2 );
values = 2;
}
picture example
回答1:
How to understand EMPTY_VALUE in MQL4 Custom Indicators?
MQL4's convention is not to paint / show CustomIndicator-line-segments to/from Bars, where CustomIndicator-storageBuffer contains a specially recognised "Empty_Value" == { EMPTY_VALUE | a value pre-set via SetIndexEmptyValue() }.
By default, "Empty_Value" is EMPTY_VALUE.
The key step is this trick:
if ( main5 < signal5
&& Low[0] < ma5
){
ExtMapBuffer2[i] = ( ( Close[i+1] + Close[i] ) / 2 ); // .CALC/.STO
values = MAIN_UNDER_SIGNAL; // .SET
if ( values_PREV!= MAIN_UNDER_SIGNAL ){ // ? WAS A FLIP
values_PREV = MAIN_UNDER_SIGNAL; // .SET
ExtMapBuffer3[i+1] = ExtMapBuffer1[i+1]; // .STO[i+1]
ExtMapBuffer3[i ] = ExtMapBuffer2[i ]; // .STO[i+0]
}
}
The recommended changes in context of the New-MQL4 code are here:
// ------------------------------------------------------------------------------------
// FOR AN EA-INTEGRATION INTERFACE, ref. below
// ------------------------------------------------------------------------------------
#property strict // check this against OnCalculate() syntax requirement
#property indicator_separate_window
//roperty indicator_level1 75.0 // N/A for aPriceDOMAIN line
//roperty indicator_level2 25.0 // N/A for aPriceDOMAIN line
//roperty indicator_levelcolor clrLimeGreen
//roperty indicator_levelwidth 1
//roperty indicator_levelstyle 0
//roperty indicator_buffers 5 // not used
#property indicator_buffers 3
#property indicator_color1 clrGreen
#property indicator_color2 clrRed
#property indicator_color3 clrDimGray
/*roperty indicator_color4 Green // not used
#property indicator_color5 Red // not used
*/
#property description "Scalping in M5 Custom Indicator......................"
#property description "How to use it ......................................."
#property description "How to setup ........................................"
extern string howtouse = "scalping in M5"; // "New"-MQL4 shows comments in dialog box
extern string contact = "reiz_gamer@yahoo.co.id"; // Contact Email
extern string created = "created by reza rahmad"; // copyright notice
extern int barsToProcess = 100; // Bars To Process ( Depth )
double ExtMapBuffer1[],
ExtMapBuffer2[],
ExtMapBuffer3[];
double buy[];
double sell[];
int values,
values_PREV = EMPTY; // <STATE-FULL>-logic
#define MAIN_ABOVE_SIGNAL 1
#define MAIN_UNDER_SIGNAL 2
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
int OnInit() {
IndicatorShortName( "SigREZ( " + DoubleToStr( barsToProcess, 0 ) + " )");
IndicatorDigits( Digits + 1 ); // override default decimal points
// to be distinguishable once AVG(Close1,Close0) values are calculated
SetIndexStyle( 0, DRAW_LINE ); // MAIN_ABOVE_SIGNAL
SetIndexBuffer( 0, ExtMapBuffer1 ); // segments for values == 1
SetIndexDrawBegin( 0, barsToProcess );
SetIndexStyle( 1, DRAW_LINE ); // MAIN_UNDER_SIGNAL
SetIndexBuffer( 1, ExtMapBuffer2 ); // segments for values == 2
SetIndexDrawBegin( 1, barsToProcess );
SetIndexStyle( 2, DRAW_LINE ); // EMPTY_SEGMENTs
SetIndexBuffer( 2, ExtMapBuffer3 );
SetIndexDrawBegin( 2, barsToProcess );
/*
SetIndexStyle( 3, DRAW_NONE ); // not used
SetIndexBuffer( 3, buy );
SetIndexEmptyValue( 3, 0.0 );
SetIndexStyle( 4, DRAW_ARROW, EMPTY, 3, Magenta );
SetIndexArrow( 4, 234 );
SetIndexBuffer( 4, sell );
SetIndexEmptyValue( 4, 0.0 );
*/
// ----------------------------------------------------------------------------------
// initialization of the generator of random numbers
// ----------------------------------------------------------------------------------
ObjectCreate( "sig", OBJ_TEXT, 0, 0, 0, 0, 0 );
ObjectSetText( "sig", "TAHAN", 10, "Times New Roman", Magenta );
ObjectCreate( "sig1", OBJ_LABEL, 0, 0, 0, 0, 0 );
ObjectSet( "sig1", OBJPROP_XDISTANCE, 750 );
ObjectSet( "sig1", OBJPROP_YDISTANCE, 20 );
ObjectSetText( "sig1", "created by reza rahmad scalping use in tf 5m", 10, "Times New Roman", Magenta );
return(0);
}
//+------------------------------------------------------------------+
//| Custom indicator iteration function |
//+------------------------------------------------------------------+
int deinit() {
ObjectDelete( "tare" );
ObjectDelete( "tarmid" );
ObjectDelete( "tare1" );
ObjectDelete( "sig" );
ObjectDelete( "sig1" );
return(0);
}
//+------------------------------------------------------------------+
//| |
//+------------------------------------------------------------------+
int start() {
int limit = Bars,
counted_bars = IndicatorCounted();
if ( counted_bars > 0 ) counted_bars--;
limit -= counted_bars;
if ( limit > barsToProcess ) limit = barsToProcess;
for ( int i = 0; i < limit; i++ ) {
double main5 = iStochastic( NULL, PERIOD_M5, 14, 3, 3, MODE_SMMA, 0, MODE_MAIN, i );
double signal5 = iStochastic( NULL, PERIOD_M5, 14, 3, 3, MODE_SMMA, 0, MODE_SIGNAL, i );
double ma20 = iMA( NULL, PERIOD_M5, 20, 0, MODE_SMA, PRICE_CLOSE, 0 );
double ma5 = iMA( NULL, PERIOD_M5, 5, 0, MODE_SMA, PRICE_CLOSE, 0 );
if ( main5 > signal5
&& High[0] > ma5
){
ExtMapBuffer1[i] = ( ( Close[i+1] + Close[i] ) / 2 ); // .CALC/.STO
values = MAIN_ABOVE_SIGNAL; // .SET
if ( values_PREV!= MAIN_ABOVE_SIGNAL ){ // ? WAS A FLIP
values_PREV = MAIN_ABOVE_SIGNAL; // .SET
ExtMapBuffer3[i+1] = ExtMapBuffer2[i+1]; // .STO[i+1]
ExtMapBuffer3[i ] = ExtMapBuffer1[i ]; // .STO[i+0]
}
}
if ( main5 < signal5
&& Low[0] < ma5
){
ExtMapBuffer2[i] = ( ( Close[i+1] + Close[i] ) / 2 ); // .CALC/.STO
values = MAIN_UNDER_SIGNAL; // .SET
if ( values_PREV!= MAIN_UNDER_SIGNAL ){ // ? WAS A FLIP
values_PREV = MAIN_UNDER_SIGNAL; // .SET
ExtMapBuffer3[i+1] = ExtMapBuffer1[i+1]; // .STO[i+1]
ExtMapBuffer3[i ] = ExtMapBuffer2[i ]; // .STO[i+0]
}
}
}
}
Tool for a safer MQL4 integration Interface between EA & Custom Indicator
Due to the nature of the iCustom() syntax and ordering of the parameters, it is much safer to create a copy/paste-interface-template as a header-section for an EA, right during the Custom Indicator design phase, that will prepare all relevant details for a safe-call-API contract ( irrespective how weak it technically is )
This template-tool avoids countless troubles and loss of productivity on debugging a syntactically feasible, however wrong calls of iCustom() due to passing wrong, ill-mixed parameters ( a missing-one / a wrong-value / a wrong-order / ... )
// ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
// COPY/PASTE.START
// ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
// CALL-er SIDE INTERFACE |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
//
// #define sIndicatorPathNAME "#AliceInTheWonderlands_msMOD_0.00"
//
// //_____________________________________INPUT(s)
// // NONE // n/a
//
// //_____________________________________OUTPUT(s):
// #define iOutputDoubleOpenBUFFER 0
// #define iOutputDoubleHighBUFFER 1
// #define iOutputDoubleLowBUFFER 2
// #define iOutputDoubleCloseBUFFER 3
// #define iOutputDoubleVolumeBUFFER 4
// #define iOutputDoubleTimeBUFFER 5
//
// double iCustom( _Symbol, // string symbol, // symbol: Symbol name on the data of which the indicator will be calculated. NULL means the current symbol.
// PERIOD_CURRENT, // int timeframe, // timeframe
// sIndicatorPathNAME, // string name, // path/name of the custom indicator compiled program: Custom indicator compiled program name, relative to the root indicators directory (MQL4/Indicators/). If the indicator is located in subdirectory, for example, in MQL4/Indicators/Examples, its name must be specified as "Examples\\indicator_name" (double backslash "\\"must be specified as separator instead of a single one).
// <<N/A>>, // ...[1] ..., // custom indicator [1]-st input parameters (if necessary)
// // ...[2+] // custom indicator further input parameters (if necessary)
// <iOutputDouble*BUFFER>, // int mode, // line index: Line index. Can be from 0 to 7 and must correspond with the index, specified in call of the SetIndexBuffer() function.
// i // int bar_shift // shift
// );
// ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
// COPY/PASTE.END
// ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
The remaining gaps result from code-design. The demonstrated approach with using triple-buffer-ed line construction fully covered the Question asked.
The remaining issue is related with business-logic algorithmisation, that was coded by O/P in a form of independent, serial-sequence of if(){...}-constructors, that are simply not able of proper handling all the existing Tri-State-FSA transitions.
来源：https://stackoverflow.com/questions/26362199/mql4-coding-empty-buffer-in-line