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MQL5 Cookbook: 开发多品种指标分析价格偏离·综合运用
本章目录
「历史数据拉取的重试与兜底」
MT5 自定义指标在 OnInit 或 OnCalculate 早期常遇到历史数据尚未就绪的情况，直接算缓冲区会得到空值或错位结果。上面这段逻辑用 attempts=100 次循环去拿 SERIES_BARS_COUNT 与 CopyTime 的时间数组，就是给服务端同步留余量。 具体看第一个 for 循环：用 SeriesInfoInteger 取指定周期的已加载 bar 数，只要大于 0 就 break；第二个 for 循环用 CopyTime 从终端首个日期加周期秒数到当前时间拉时间轴，同样成功才跳出。若两次都没拿到（ArraySize(time)<=0 或 total_period_bars<=0），就清掉上次计算量并返回 false，避免在残缺数据上画图。 FillIndicatorBuffers 里也沿用了同一思路：对单个 bar 用 CopyRates 最多试 100 次，成功一次就 ResetLastError 并 break；若 rates 数组不足或 GetLastError 非 0 直接 return。外汇与贵金属行情在高波动时段可能延迟推送，这种重试机制能降低指示器首屏空白的概率，但无法消除报价中断风险，实盘前应在 MT5 策略测试器用不同品种验证。
MQL5 / C++
for(class="type">int i=class="num">0; i<attempts; i++) if((total_period_bars=(class="type">int)SeriesInfoInteger(Symbol(),timeframe_start_point,SERIES_BARS_COUNT))>class="num">0) class="kw">break; class=class="str">"cmt">//--- Check the readiness of bar data for(class="type">int i=class="num">0; i<attempts; i++) class=class="str">"cmt">//--- Copy the specified amount of data if(CopyTime(Symbol(),timeframe_start_point, terminal_first_date+PeriodSeconds(timeframe_start_point),TimeCurrent(),time)>class="num">0) class="kw">break; class=class="str">"cmt">//--- If the amount of data copied is not sufficient, one more attempt is required if(ArraySize(time)<=class="num">0 || total_period_bars<=class="num">0) { msg_last=msg_prepare_data; ShowCanvasMessage(msg_prepare_data); OC_prev_calculated=class="num">0; class="kw">return(false); } } class=class="str">"cmt">//--- class="kw">return(true); } class=class="str">"cmt">//+------------------------------------------------------------------+ class=class="str">"cmt">//| Fills indicator buffers | class=class="str">"cmt">//+------------------------------------------------------------------+ class="type">void FillIndicatorBuffers(class="type">int i,class="type">int s,class="type">class="kw">datetime const &time[]) { class="type">MqlRates rates[]; class=class="str">"cmt">// Data structure class="type">class="kw">double period_open[]; class=class="str">"cmt">// Opening price for bar at the price divergence starting point class="type">class="kw">datetime period_time[]; class=class="str">"cmt">// Time of the price divergence starting point class="type">int attempts=class="num">100; class=class="str">"cmt">// Number of copying attempts class="type">class="kw">datetime high_tf_time=NULL; class=class="str">"cmt">// Time of higher timeframe&class="macro">#x27;s bar class=class="str">"cmt">//--- Exit if we are out of "true" bars zone if(time[i]<limit_time[s]) class="kw">return; class=class="str">"cmt">//--- Reset the last error ResetLastError(); class=class="str">"cmt">//--- Get data of current bar for the specified symbol for(class="type">int j=class="num">0; j<attempts; j++) if(CopyRates(symbol_names[s],Period(),time[i],class="num">1,rates)==class="num">1) { ResetLastError(); class="kw">break; } class=class="str">"cmt">//--- Exit if failed to get data if(ArraySize(rates)<class="num">1 || GetLastError()!=class="num">0) class="kw">return; class=class="str">"cmt">//--- If the current time is before the first timeframe&class="macro">#x27;s time or class=class="str">"cmt">// bar time is not equal to the bar time of the current symbol or class=class="str">"cmt">// empty values are fetched if(rates[class="num">0].time==NULL ||
◍ 背离起点在高周期上的时间锚定
在指标计算里，先要判断当前处理的柱是否合法：若时间不匹配、早于高周期首根时间，或高周期 OHLC 任一为 EMPTY_VALUE，就直接把缓冲写空并 return，避免脏数据污染图形。 当背离起点模式设为 VERTICAL_LINE 时，逻辑很简单——用 ObjectGetInteger 取画线对象的 OBJPROP_TIME 作为 divergence_time，再把当前图表 time[0] 记成 first_period_time，垂直线就锚在这两点。 非垂直线模式下，首次进入会把高周期首根开盘时间通过 CopyTime 拿到（最多 attempts 次重试，失败即退出），之后按当前柱时间是否早于该首根，决定 high_tf_time 取首根还是当前柱，再用 CopyOpen 取对应高周期开盘价。外汇与贵金属波动剧烈，高周期数据偶尔取不到，这类重试与空值守卫是必须保留的。
MQL5 / C++
time[i]!=rates[class="num">0].time || time[i]<first_period_time || rates[class="num">0].low==EMPTY_VALUE || rates[class="num">0].open==EMPTY_VALUE || rates[class="num">0].high==EMPTY_VALUE || rates[class="num">0].close==EMPTY_VALUE) { class=class="str">"cmt">//--- Write empty value if(DrawType!=LINE) { buffer_data[s].low[i] =EMPTY_VALUE; buffer_data[s].open[i] =EMPTY_VALUE; buffer_data[s].high[i] =EMPTY_VALUE; } buffer_data[s].close[i]=EMPTY_VALUE; class="kw">return; } class=class="str">"cmt">//--- If current mode is vertical line of the price divergence starting point if(StartPriceDivergence==VERTICAL_LINE) { class=class="str">"cmt">//--- Get the time of the line divergence_time=(class="type">class="kw">datetime)ObjectGetInteger(class="num">0,start_price_divergence,OBJPROP_TIME); class=class="str">"cmt">//--- Get the time of the first bar first_period_time=time[class="num">0]; } class=class="str">"cmt">//--- For all other modes, we will keep track the beginning of period else { class=class="str">"cmt">//--- If we are here for the first time, store data of the first bar of higher timeframe if(divergence_time==NULL) { ResetLastError(); class=class="str">"cmt">//--- Get opening time of the first bar of higher timeframe for(class="type">int j=class="num">0; j<attempts; j++) if(CopyTime(Symbol(),timeframe_start_point,time[class="num">0]+PeriodSeconds(timeframe_start_point),class="num">1,period_time)==class="num">1) { ResetLastError(); class="kw">break; } class=class="str">"cmt">//--- Exit if failed to get price/time if(ArraySize(period_time)<class="num">1 || GetLastError()!=class="num">0) class="kw">return; class=class="str">"cmt">//--- Otherwise store time of the first bar of higher timeframe else first_period_time=period_time[class="num">0]; } class=class="str">"cmt">//--- If current bar&class="macro">#x27;s time on the current timeframe is before the first bar&class="macro">#x27;s time on higher timeframe if(time[i]<first_period_time) high_tf_time=first_period_time; class=class="str">"cmt">//--- Otherwise we will receive data of the last bar of the higher timeframe with respect to the current bar on the current timeframe else high_tf_time=time[i]; class=class="str">"cmt">//--- Reset the last error ResetLastError(); class=class="str">"cmt">//--- Get the opening price of the first bar of the higher timeframe for(class="type">int j=class="num">0; j<attempts; j++) if(CopyOpen(Symbol(),timeframe_start_point,high_tf_time,class="num">1,period_open)==class="num">1)
背离起点锚定与垂直画线逻辑
在跨周期取数失败时必须及时退出，否则后续数组越界会让整个指标崩在 MT5 的某根 K 线上。代码用 ArraySize(period_open)<1 或 ArraySize(period_time)<1 配合 GetLastError()!=0 做双重保险，只要较高周期的开盘时间或价格没取到就直接 return。 当当前图表时间早于背离起点时间，或内存里记录的 divergence_time 与本次取到的 period_time[0] 不一致时，说明价格背离区间重新开启了。此时把 symbol_difference 和 inverse_difference 清零，并把 divergence_time、divergence_price 重设为高周期第一根 K 线的对应值，相当于把锚点往前挪。 锚点重设后会调用 CreateVerticalLine 在 divergence_time 处画一条白色实线（样式 STYLE_SOLID、宽度 2、不可选中但可后台隐藏），名字拼了 start_price_divergence + 下划线 + TimeToString(divergence_time)，方便在对象列表里一眼定位。 如果模式是 VERTICAL_LINE 且 time[i]<divergence_time，说明还在背离起点左侧，差值保持 0。LINE 模式只改 close 缓冲（rates[0].close - symbol_difference[s]）；其余绘制模式则对 low/open/high/close 四个缓冲同步减去差值，并调用 SetBufferColorIndex 给当前柱子上色。外汇与贵金属波动剧烈，这类跨周期锚点在高波动时段可能频繁重画，实盘前务必在策略测试器里跑至少 3 个月 tick 数据验证重画频率。
MQL5 / C++
{ ResetLastError(); class="kw">break; }
class=class="str">"cmt">//--- Get opening time of the first bar of higher timeframe
for(class="type">int j=class="num">0;j<attempts;j++)
if(CopyTime(Symbol(),timeframe_start_point,high_tf_time,class="num">1,period_time)==class="num">1)
{ ResetLastError(); class="kw">break; }
class=class="str">"cmt">//--- Exit if failed to get price/time
if(ArraySize(period_open)<class="num">1 || ArraySize(period_time)<class="num">1 || GetLastError()!=class="num">0)
class="kw">return;
class=class="str">"cmt">//--- If the current timeframe&class="macro">#x27;s time is before the first period&class="macro">#x27;s time or
class=class="str">"cmt">// time of specified period is not equal to the one in memory
if(time[i]<first_period_time || divergence_time!=period_time[class="num">0])
{
symbol_difference[s] =class="num">0.0; class=class="str">"cmt">// Zero out difference in symbol prices
inverse_difference[s] =class="num">0.0; class=class="str">"cmt">// Zero our difference of inversion
class=class="str">"cmt">//--- Store time of the price divergence starting point
divergence_time=period_time[class="num">0];
class=class="str">"cmt">//--- Store price of the price divergence starting point
divergence_price=period_open[class="num">0];
class=class="str">"cmt">//--- Set vertical line in the beginning of the price divergence start
CreateVerticalLine(class="num">0,class="num">0,period_time[class="num">0],start_price_divergence+"_"+TimeToString(divergence_time),
class="num">2,STYLE_SOLID,clrWhite,false,false,true,TimeToString(divergence_time),"\n");
}
}
class=class="str">"cmt">//--- If current mode is &class="macro">#x27;Vertical Line&class="macro">#x27; and bar&class="macro">#x27;s time is less than line&class="macro">#x27;s time
if(StartPriceDivergence==VERTICAL_LINE && time[i]<divergence_time)
{
class=class="str">"cmt">//--- Keep zero values of difference
symbol_difference[s] =class="num">0.0;
inverse_difference[s] =class="num">0.0;
class=class="str">"cmt">//--- For the &class="macro">#x27;Line&class="macro">#x27; drawing mode only opening price is used
if(DrawType==LINE)
buffer_data[s].close[i]=rates[class="num">0].close-symbol_difference[s];
class=class="str">"cmt">//--- For all other modes all prices are used
else
{
buffer_data[s].low[i] =rates[class="num">0].low-symbol_difference[s];
buffer_data[s].open[i] =rates[class="num">0].open-symbol_difference[s];
buffer_data[s].high[i] =rates[class="num">0].high-symbol_difference[s];
buffer_data[s].close[i]=rates[class="num">0].close-symbol_difference[s];
class=class="str">"cmt">//--- Set class="type">color for the current element of indicator buffer
SetBufferColorIndex(i,s,rates[class="num">0].close,rates[class="num">0].open);
}
}
class=class="str">"cmt">//--- For all other modes
else
{「镜像品种的价差锚定与缓冲写入」
做跨品种背离指标时，若勾选了镜像反转（inverse[s] 为真），就得先把基准价差算清楚，否则后面画出来的线会整体漂移。新周期刚启动的瞬间，symbol_difference[s] 还是 0.0，这时才允许重算锚点，避免每根 K 线都重设基准导致图形抖动。 垂直基线模式（VERTICAL_LINE）和其他模式取价不同：前者用 OC_open[i] 作参照，后者用 divergence_price。镜像场景下还要额外算 inverse_difference[s]，它等于参照价减去其相反数，本质是把坐标轴对称翻转到负半轴。 LINE 模式只写 close 缓冲，其他模式则把 low/open/high/close 全部按「负(实时价-锚差)+镜像差」重写，并调用 SetBufferColorIndex 给每根 K 上色。若不镜像，逻辑砍掉一半：仅在新周期补一次 symbol_difference[s]，后续直接拿实时价减锚差绘图，省掉翻轴计算。 开 MT5 把下面片段塞进你的指标 OnCalculate，把 VERTICAL_LINE 和 LINE 两个宏值对调，能直观看到 XAUUSD 相对镜像基准的背离带如何整体上下翻转。外汇与贵金属品种点差跳变频繁，镜像基准在重大数据行情中可能瞬间失准，仅作概率参考。
MQL5 / C++
class=class="str">"cmt">//--- If inversion of symbol data is required if(inverse[s]) { class=class="str">"cmt">//--- If new period has started, recalculate variables if(symbol_difference[s]==class="num">0.0) { class=class="str">"cmt">//--- For the &class="macro">#x27;Vertical Line&class="macro">#x27; mode if(StartPriceDivergence==VERTICAL_LINE) { class=class="str">"cmt">//--- Calculate the difference symbol_difference[s] =rates[class="num">0].open-OC_open[i]; inverse_difference[s] =OC_open[i]-(-OC_open[i]); } class=class="str">"cmt">//--- For all other modes else { class=class="str">"cmt">//--- Calculate the difference symbol_difference[s] =rates[class="num">0].open-divergence_price; inverse_difference[s] =divergence_price-(-divergence_price); } } class=class="str">"cmt">//--- In the &class="macro">#x27;Line&class="macro">#x27; mode only opening price is used if(DrawType==LINE) buffer_data[s].close[i]=-(rates[class="num">0].close-symbol_difference[s])+inverse_difference[s]; class=class="str">"cmt">//--- For all other modes all prices are used else { buffer_data[s].low[i] =-(rates[class="num">0].low-symbol_difference[s])+inverse_difference[s]; buffer_data[s].open[i] =-(rates[class="num">0].open-symbol_difference[s])+inverse_difference[s]; buffer_data[s].high[i] =-(rates[class="num">0].high-symbol_difference[s])+inverse_difference[s]; buffer_data[s].close[i] =-(rates[class="num">0].close-symbol_difference[s])+inverse_difference[s]; class=class="str">"cmt">//--- Set class="type">color for the current element of indicator buffer SetBufferColorIndex(i,s,rates[class="num">0].close,rates[class="num">0].open); } } class=class="str">"cmt">//--- If inversion is not used, then we need to calculate only the difference between symbol prices at the beginning of period else { class=class="str">"cmt">//--- If new period has started if(symbol_difference[s]==class="num">0.0) { class=class="str">"cmt">//--- For the &class="macro">#x27;Vertical Line&class="macro">#x27; mode if(StartPriceDivergence==VERTICAL_LINE) symbol_difference[s]=rates[class="num">0].open-OC_open[i]; class=class="str">"cmt">//--- For all other modes else symbol_difference[s]=rates[class="num">0].open-divergence_price; } class=class="str">"cmt">//--- For the &class="macro">#x27;Line&class="macro">#x27; drawing mode only opening price is used
◍ 差值缓冲的空值校验与双色判定
多符号叠加指标里，算完相对价差缓冲后必须做一轮合法性过滤，否则老符号在跳空或加载初期会画出悬空线段。LINE 模式只用了 close 缓冲，因此只要当前柱时间对不上基准周期时间、或早于首根有效周期，就直接写 EMPTY_VALUE。 非 LINE 模式（含 OHLC 全部价格）的判定更严：除时间错位外，还要排查 rates[0].time==NULL 以及 low/open/high/close 中任一为 EMPTY_VALUE 的情况。只要命中任一条件，四个缓冲位全置空，避免半截 K 线误导读图。 双色渲染靠 SetBufferColorIndex() 落地：传入柱序 i、符号序号、close 与 open，当 close>open 时 icolor[i] 记 0（涨柱色），否则落第二种颜色。实盘加载 EURUSD+XAUUSD 这类跨品种组合时，建议在 MT5 里临时把 TwoColor 关掉对比，能直观看到收口逻辑是否吞掉了早期柱。 外汇与贵金属跨品种叠加受点差和节假日影响大，缓冲置空仅是防错手段，不代表信号概率提升，验证时请控制仓位。
MQL5 / C++
if(DrawType==LINE) buffer_data[s].close[i]=rates[class="num">0].close-symbol_difference[s]; class=class="str">"cmt">//--- For all other modes all prices are used else { buffer_data[s].low[i] =rates[class="num">0].low-symbol_difference[s]; buffer_data[s].open[i] =rates[class="num">0].open-symbol_difference[s]; buffer_data[s].high[i] =rates[class="num">0].high-symbol_difference[s]; buffer_data[s].close[i] =rates[class="num">0].close-symbol_difference[s]; class=class="str">"cmt">//--- Set class="type">color for the current element of indicator buffer SetBufferColorIndex(i,s,rates[class="num">0].close,rates[class="num">0].open); } } } class=class="str">"cmt">//--- Verification of the calculated values class=class="str">"cmt">// In the &class="macro">#x27;Line&class="macro">#x27; mode only opening price is used if(DrawType==LINE) { class=class="str">"cmt">//--- If the current time is before the first timeframe&class="macro">#x27;s time or class=class="str">"cmt">// bar time is not equal to the bar time, write empty value if(time[i]!=rates[class="num">0].time || time[i]<first_period_time) buffer_data[s].close[i]=EMPTY_VALUE; } class=class="str">"cmt">//--- For all other modes all prices are used else { class=class="str">"cmt">//--- If the current time is before the first timeframe&class="macro">#x27;s time or class=class="str">"cmt">// bar time is not equal to the bar time of the current symbol or class=class="str">"cmt">// empty values are fetched if(rates[class="num">0].time==NULL || time[i]!=rates[class="num">0].time || time[i]<first_period_time || rates[class="num">0].low==EMPTY_VALUE || rates[class="num">0].open==EMPTY_VALUE || rates[class="num">0].high==EMPTY_VALUE || rates[class="num">0].close==EMPTY_VALUE) { class=class="str">"cmt">//--- Write empty value buffer_data[s].low[i] =EMPTY_VALUE; buffer_data[s].open[i] =EMPTY_VALUE; buffer_data[s].high[i] =EMPTY_VALUE; buffer_data[s].close[i] =EMPTY_VALUE; } } } class="type">void SetBufferColorIndex(class="type">int i,class="type">int symbol_number,class="type">class="kw">double close,class="type">class="kw">double open) { class=class="str">"cmt">//--- For two-class="type">color mode, check condition if(TwoColor) { class=class="str">"cmt">//--- If the closing price is more than the opening price, this is up bar, so we use the first class="type">color if(close>open) buffer_data[symbol_number].icolor[i]=class="num">0; class=class="str">"cmt">//--- otherwise it is down bar, so we use the second class="type">color
多品种图表高低点重算的容错写法
在把多个交易品种叠到同一张 MT5 图表上时，主图自身的 HIGH/LOW 往往只认当前品种，叠加上去的副图缓冲容易被裁掉上下边缘。CorrectChartMaxMin 这个函数就是专门按可见区域把所有缓冲的高低价拉通重算的。 函数开头先声明 low[]、high[] 两个数组，并给 attempts 写死为 10——意思是复制高低价时最多重试 10 次，避免行情跳动瞬间 CopyHigh / CopyLow 返回根数不足直接废掉整轮绘制。 可见根数用 ChartGetInteger(0, CHART_VISIBLE_BARS) 拿，首根可见 bar 用 CHART_FIRST_VISIBLE_BAR，末根则等于首根减可见根数；若算出来小于 0 就强制归 0，防止左侧越界。 高低价获取分两个 for 循环各跑最多 10 次，只要某次 CopyHigh / CopyLow 返回根数等于 visible_bars 就 break。若最终数组尺寸 ≤0 直接 return，不往下走；否则用 ArrayMinimum、ArrayMaximum 从数组里抠出 min_price 和 max_price，后面再拿去扩边。 外汇与贵金属杠杆高、跳空频繁，这种重试 + 边界修正的写法在实盘多品种监控里能明显降低图形撕裂概率，建议直接把 attempts=10 抄进你自己的指标骨架里跑一下。
MQL5 / C++
else buffer_data[symbol_number].icolor[i]=class="num">1; } class=class="str">"cmt">//--- For one-class="type">color mode we use the first class="type">color for all bars/candlesticks else buffer_data[symbol_number].icolor[i]=class="num">0; } class=class="str">"cmt">//+------------------------------------------------------------------+ class=class="str">"cmt">//| Corrects chart&class="macro">#x27;s high/low with respect to all buffers | class=class="str">"cmt">//+------------------------------------------------------------------+ class="type">void CorrectChartMaxMin() { class="type">class="kw">double low[]; class=class="str">"cmt">// Array of lows class="type">class="kw">double high[]; class=class="str">"cmt">// Array of highs class="type">int attempts =class="num">10; class=class="str">"cmt">// Number of attempts class="type">int array_size =class="num">0; class=class="str">"cmt">// Array size for drawing class="type">int visible_bars =class="num">0; class=class="str">"cmt">// Number of visible bars class="type">int first_visible_bar =class="num">0; class=class="str">"cmt">// Number of the first visible bar class="type">int last_visible_bar =class="num">0; class=class="str">"cmt">// Number of the last visible bar class="type">class="kw">double max_price =class="num">0.0; class=class="str">"cmt">// Highest price class="type">class="kw">double min_price =class="num">0.0; class=class="str">"cmt">// Lowest price class="type">class="kw">double offset_max_min =class="num">0.0; class=class="str">"cmt">// Offset from chart&class="macro">#x27;s high/low class=class="str">"cmt">//--- Reset the last error ResetLastError(); class=class="str">"cmt">//--- Number of visible bars visible_bars=(class="type">int)ChartGetInteger(class="num">0,CHART_VISIBLE_BARS); class=class="str">"cmt">//--- Number of the first visible bar first_visible_bar=(class="type">int)ChartGetInteger(class="num">0,CHART_FIRST_VISIBLE_BAR); class=class="str">"cmt">//--- Number of the last visible bar last_visible_bar=first_visible_bar-visible_bars; class=class="str">"cmt">//--- Exit in case of error if(GetLastError()!=class="num">0) class="kw">return; class=class="str">"cmt">//--- Fix incorrect value if(last_visible_bar<class="num">0) last_visible_bar=class="num">0; class=class="str">"cmt">//--- Get the current symbol high/low in visible area of chart for(class="type">int i=class="num">0; i<attempts; i++) if(CopyHigh(Symbol(),Period(),last_visible_bar,visible_bars,high)==visible_bars) class="kw">break; for(class="type">int i=class="num">0; i<attempts; i++) if(CopyLow(Symbol(),Period(),last_visible_bar,visible_bars,low)==visible_bars) class="kw">break; class=class="str">"cmt">//--- Exit if failed to get data if(ArraySize(high)<=class="num">0 || ArraySize(low)<=class="num">0) class="kw">return; class=class="str">"cmt">//--- If succeeded to get data, identify high and low in the current symbol arrays else { min_price=low[ArrayMinimum(low)]; max_price=high[ArrayMaximum(high)]; } class=class="str">"cmt">//--- Get high and low prices in all price arrays
「多品种遍历里的数据对齐坑点」
在 MT5 里做跨品种指标绘制时，外层 for 循环按 SYMBOLS_COUNT 逐个处理品种，但 symbol_names[s]==empty_symbol 的分支直接 continue，说明监控列表里可能存在空槽位——这是从配置数组初始化时留下的，实盘前务必确认填充逻辑没漏填，否则会静默跳过部分品种。 时间数组的获取用了 attempts 次重试去 CopyTime，只有成功拿到 visible_bars 根才 break；若 ArraySize(time) 仍小于 visible_bars 就直接 return，意味着图表可视 K 线数不足时整个刷新中止。外汇与贵金属品种在跳空或流动性中断时，可能拿不到完整序列，属正常高风险现象。 limit_time[s] 与 time[0] 的比较决定了 bars_count 取法：若限定时间晚于首根可见 bar 时间，用 Bars() 反推真实可用根数；否则直接取 visible_bars。LINE 模式和非 LINE 模式对 low/high 缓冲的拷贝源不同（前者用 close 填充两者），调试时若发现线模式高低位重合，就是这个分支在起作用。 ArraySetAsSeries 把 low/high 设为时间序列，保证索引 0 是最新 bar；随后 ArrayCopy 把各品种缓冲数据搬进主数组，array_size 取自 high，循环填空值避免参与极值计算。开 MT5 把这段塞进你的多品种 EA 初始化后跑一遍，观察 limit_time 边界附近的 bars_count 跳变。
MQL5 / C++
for(class="type">int s=class="num">0; s<SYMBOLS_COUNT; s++) { class=class="str">"cmt">//--- If current symbol is not present, go to the next one if(symbol_names[s]==empty_symbol) class="kw">continue; class=class="str">"cmt">//--- class="type">class="kw">datetime time[]; class=class="str">"cmt">// Time array class="type">int bars_count=class="num">0; class=class="str">"cmt">// Number of bars for calculation class=class="str">"cmt">//--- Set zero size for arrays ArrayResize(high,class="num">0); ArrayResize(low,class="num">0); class=class="str">"cmt">//--- Get the time of the first bar visible on chart for(class="type">int i=class="num">0; i<attempts; i++) if(CopyTime(Symbol(),Period(),last_visible_bar,visible_bars,time)==visible_bars) class="kw">break; class=class="str">"cmt">//--- Exit if the amount of data is less than number of visible bars on chart if(ArraySize(time)<visible_bars) class="kw">return; class=class="str">"cmt">//--- If time of the first "true" bar is greater than class=class="str">"cmt">// time of the first visible bar on the chart, then class=class="str">"cmt">// get available number of bars of the current symbol in loop if(limit_time[s]>time[class="num">0]) { class=class="str">"cmt">//--- Get the array size array_size=ArraySize(time); class=class="str">"cmt">//--- Get the number of bars from the first "true" one if((bars_count=Bars(Symbol(),Period(),limit_time[s],time[array_size-class="num">1]))<=class="num">0) class="kw">return; } class=class="str">"cmt">//--- Else get number of visible bars on chart else bars_count=visible_bars; class=class="str">"cmt">//--- Index elements in indicator buffers as timeseries ArraySetAsSeries(low,true); ArraySetAsSeries(high,true); class=class="str">"cmt">//--- Copy data from the indicator buffer class=class="str">"cmt">// All modes except &class="macro">#x27;Line&class="macro">#x27; if(DrawType!=LINE) { ArrayCopy(low,buffer_data[s].low); ArrayCopy(high,buffer_data[s].high); } class=class="str">"cmt">//--- For the &class="macro">#x27;Line&class="macro">#x27; mode else { ArrayCopy(low,buffer_data[s].close); ArrayCopy(high,buffer_data[s].close); } class=class="str">"cmt">//--- Get the array size array_size=ArraySize(high); class=class="str">"cmt">//--- Fill empty values, class=class="str">"cmt">// so they are not considered when calculating high/low for(class="type">int i=class="num">0; i<array_size; i++) {
◍ 反转型图表里的极值抓取与固定比例尺
在价格背离指标里，若某一子图被标记为 inverted（inverse[s]=true），高低点的取法要反过来：用 low 数组里的极大值去推 max_price，用 high 数组里的极小值去推 min_price，否则仍按常规取 low 的最小值与 high 的最大值。 代码片段里靠 ArrayMaximum / ArrayMinimum 在 last_visible_bar 起的 bars_count 根 K 线内定位极值下标，再用 fmax / fmin 把历史极值与当前窗口极值合并，避免缩放时上下边界跳变。 极值差会先乘 3 再除 100，也就是在图表顶底各留 3% 的空白偏移；随后 ChartSetInteger(0,CHART_SCALEFIX,true) 锁死比例，并用 ChartSetDouble 写死 CHART_FIXED_MAX / CHART_FIXED_MIN，最后 ChartRedraw 刷新。 拖拽起点对象（CHARTEVENT_OBJECT_DRAG）且模式为 VERTICAL_LINE 时，直接重算 OnCalculate，让背离起点随手动拖线实时更新——外汇与贵金属波动大，固定比例尺下若点错起点，视觉背离可能完全失真，建议开 MT5 用 EURUSD 15 分钟图手动拖一次验证。
MQL5 / C++
if(high[i]==EMPTY_VALUE) high[i]=max_price; if(low[i]==EMPTY_VALUE) low[i]=min_price; } class=class="str">"cmt">//--- Get high/low with respect to inversion if(inverse[s]) { class=class="str">"cmt">//--- If no errors occur, store values if(ArrayMaximum(high,last_visible_bar,bars_count)>=class="num">0 && ArrayMinimum(low,last_visible_bar,bars_count)>=class="num">0) { max_price=fmax(max_price,low[ArrayMaximum(low,last_visible_bar,bars_count)]); min_price=fmin(min_price,high[ArrayMinimum(high,last_visible_bar,bars_count)]); } } else { class=class="str">"cmt">//--- If no errors occur, store values if(ArrayMinimum(low,last_visible_bar,bars_count)>=class="num">0 && ArrayMaximum(high,last_visible_bar,bars_count)>=class="num">0) { min_price=fmin(min_price,low[ArrayMinimum(low,last_visible_bar,bars_count)]); max_price=fmax(max_price,high[ArrayMaximum(high,last_visible_bar,bars_count)]); } } } class=class="str">"cmt">//--- Calculate offset(class="num">3%) form chart&class="macro">#x27;s top and bottom offset_max_min=((max_price-min_price)*class="num">3)/class="num">100; class=class="str">"cmt">//--- Turn on the fixed chart scale mode. ChartSetInteger(class="num">0,CHART_SCALEFIX,true); class=class="str">"cmt">//--- Set high/low ChartSetDouble(class="num">0,CHART_FIXED_MAX,max_price+offset_max_min); ChartSetDouble(class="num">0,CHART_FIXED_MIN,min_price-offset_max_min); class=class="str">"cmt">//--- Refresh the chart ChartRedraw(); } class=class="str">"cmt">//+------------------------------------------------------------------+ class=class="str">"cmt">//| ChartEvent function | class=class="str">"cmt">//+------------------------------------------------------------------+ class="type">void OnChartEvent(const class="type">int id, const class="type">long &lparam, const class="type">class="kw">double &dparam, const class="type">class="kw">string &sparam) { class=class="str">"cmt">//--- Event of dragging a graphical object if(id==CHARTEVENT_OBJECT_DRAG) { class=class="str">"cmt">//--- If current mode is vertical line for the price divergence starting point, then update indicator buffers if(StartPriceDivergence==VERTICAL_LINE) OnCalculate(OC_rates_total, class="num">0,
用结构体收口K线字段与图表变更响应
上面这段落 closing 括号里，把单根蜡烛的八个维度一次性塞进 OC_ 开头的结构体成员：时间、开高低收、Tick 成交量、真实成交量和点差。这样在后续循环里按索引取用，比散着写八个数组更不容易在下标上出错。 CHARTEVENT_CHART_CHANGE 这个事件在用户拖拽缩放、或改了属性对话框里的坐标范围时触发。里面只调了 CorrectChartMaxMin()，意思是按当前指标缓冲区的值重新校正纵轴最大最小，避免价格跑出可视区。 在 MT5 里挂这段逻辑时，若你的指标画的是离差带而非主图价格，不重写 MaxMin 就可能看到图形被压在底部。外汇与贵金属波动大、点差跳变频繁，这类校正最好加上，否则复盘时容易误判信号位置。
MQL5 / C++
OC_time, OC_open, OC_high, OC_low, OC_close, OC_tick_volume, OC_volume, OC_spread); } class=class="str">"cmt">//--- Event of resizing the chart or modifying the chart properties using the properties dialog window. if(id==CHARTEVENT_CHART_CHANGE) class=class="str">"cmt">//--- Correct the maximum and minimum of chart with respect to the indicator buffers&class="macro">#x27; values CorrectChartMaxMin(); }
「画得少，看得清」
这套多币种价格偏离指标的核心价值不在堆参数，而在把跨品种背离压缩成一张可横向比对的图。读者在 MT5 里加载后，优先看偏离带宽度而不是绝对值，宽度突变往往早于单边行情。 有用户反馈 2020 年后在 Checks.mqh 编译挂起、2024 年指标装图报错，说明旧代码在新 build 下需要重编译并核对头文件引用。外汇与贵金属波动受杠杆和跳空影响，跨币种信号仅作概率参考，实盘前务必在策略测试器跑一遍样本外数据。 真要落地，就开 MT5 把原文指标拖上 EURUSD 与 XAUUSD 的 15 分钟图，调一次偏离周期参数，比读十篇综述都实在。
常见问题
在请求历史数据后检查返回长度，若不足则延时数秒并重试，超过设定次数就置空缓冲并打日志，避免指标卡死。
用 iTime 取高周期对应序号的时间戳，存为全局变量，后续画线和缓冲写入都以此时间为锚，防止错位。
可以，小布能读取你的指标逻辑并提示差值缓冲空值校验缺失处，还能标出双色判定可能误染的K线区间。
需要留一个微小缓冲带再写入，比如正负0.5点容差，防止 tick 跳动导致写入失败或频繁重算。
对每个品种单独包 try 容错，缺数据就跳过该品种继续算其余，并在末尾补一次全量校验重算。