Question

所以我做了一些编码，现在有空缓冲区我想问一下如何感受EMPTY_BUFFER 所以如果使用IF line == EMPTY BUFFER那么FILL IT..i已经尝试了一些编码，但仍然没有填充空缓冲区

#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

Picture Example

Answer 1

如何理解MQL4自定义指标中的EMPTY_VALUE？

MQL4的约定不是在条形图上绘制/显示 CustomIndicator -line-segments，其中CustomIndicator - storageBuffer包含特别识别的＆＃ 34; Empty_Value ＆＃34;的 == { EMPTY_VALUE | a value pre-set via SetIndexEmptyValue() }

默认情况下，＆＃34; Empty_Value ＆＃34;是EMPTY_VALUE。

关键步骤就是这个伎俩：

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] } }

New-MQL4代码的上下文中建议的更改如下：

// ------------------------------------------------------------------------------------ // 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] } } } }

EA和EA之间更安全的MQL4集成接口的工具自定义指标

由于 iCustom() 语法的性质和参数的排序，创建复制/粘贴界面模板更安全EA的标题部分，在自定义指标设计阶段，这将为 safe-call-API 合同准备所有相关详细信息（无论技术上有多弱）是）

这个模板工具避免了无数的麻烦和调试语法上可行的工作效率的损失，但是由于传递了错误的，错误的混合参数（缺少一个/错误的值/错误的错误），iCustom（）的错误调用订单/ ...）

// |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| // 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 // ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||

剩余的差距来自代码设计。 使用三重缓冲线构建的演示方法完全涵盖了问题。

剩下的问题与业务逻辑算法化有关，它是由O / P以 if(){...} - 构造函数的独立序列顺序编码的，根本就不是能够正确处理所有现有的Tri-State-FSA转换。

mql4：编译空缓冲区

1 个答案:

如何理解MQL4自定义指标中的EMPTY_VALUE？

New-MQL4代码的上下文中建议的更改如下：

EA和EA之间更安全的MQL4集成接口的工具自定义指标