如果我有一个myIndi生成变量 ( ) 的指标 ( Var1)，请问如何Var1从 EA 访问？
我试过iCustom()但没有得到结果。
问问题
4986 次
3 回答
1
iCustom()是 EA 和自定义指标之间的主要接口
考虑到编译成功并且构造的自定义指标在其内部工作原理上基本上是正确的，没有理由调用iCustom()不返回值myIndi（不要犹豫发布 MCVE 代码示例来证明或反驳这一点） ）。
下一步：
发布您的帖子的更新，以包含 MCVE 代码，以便查看此类调用的实际状态的根本原因：
retVal = iCustom( _Symbol, PERIOD_CURRENT, "myIndi",
<p1>,
<p2>,
...,
<id#>,
<shift>
);
正式的界面有点棘手，但（自我）纪律可以帮助很多：
以下方法对于 EA 端和指标端团队来说是健壮的，可以顺利、安全地分享不断发展的想法，并保持iCustom()EA 端调用接口的所有版本干净和安全，并以一种更易读的方式创建调用接口（使用#define-ed 人类可读的名称，用于有意义且连贯的 line#-identifications ）。
这些部分由自定义指标开发人员在自定义指标和 EA 团队的整个生命周期中维护，只要#include在 EA 中使用任何版本，这些部分就可以作为不言自明的模板。
//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! <<_MAINTAINED_SECTION_>>.START
//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
//!!! -------------------------------------------||||||||||||||||||||||||||||||||||||||||||| POSITIONAL ORDINAL-NUMBERED CALLING INTERFACE ||||||||||||||||||||| all iCustom() call MUST BE REVISED ____________________________ !!!
//--- indicator parameters -------------------------------------------||||||||||||||||||||||||||||||||||||||||||| POSITIONAL ORDINAL-NUMBERED CALLING INTERFACE ||||||||||||||||||||| all iCustom() call MUST BE REVISED ____________________________ !!!
//!!! -------------------------------------------||||||||||||||||||||||||||||||||||||||||||| POSITIONAL ORDINAL-NUMBERED CALLING INTERFACE ||||||||||||||||||||| all iCustom() call MUST BE REVISED ____________________________ !!!
//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
#define XYZ_CUSTOM_INDICATOR_NAME "an_XYZ_<fileName_w/o_.MQ4>" // the Custom Indicator fileName
//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
//--- input parameters -------------------------------------------------------- iCustom( ) CALL INTERFACE
input int nBARs_period = 18;
extern double MUL_SIGMA = 0;
sinput ENUM_APPLIED_PRICE aPriceTYPE = PRICE_CLOSE;
//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
/* = iCustom( _Symbol, PERIOD_CURRENT, XYZ_CUSTOM_INDICATOR_NAME, // |-> iCustom INDICATOR NAME
XYZ_nBARs_period, // |-> input1 nBARs_period
XYZ_MUL_SIGMA, // |-> input2 MUL_SIGMA
XYZ_PRICE_TYPE, // |-> input3 aPriceTYPE from: ENUM_APPLIED_PRICE
XYZ_<_VALUE_>_BUFFER_ID, // |-> line# --------------------------------------------from: { 0: Val1 == Buffer0[] | 1: Buffer1[] | ... }
aShift // |-> [aShift]-aTimeDOMAIN-offset of a Val1[] to return
); //
*/
#define XYZ_Val1_BUFFER_ID 0 // <---- <Val1>[]
#define XYZ_Val2_BUFFER_ID 1
#define XYZ_Val3_BUFFER_ID 2
#define XYZ_Val4_BUFFER_ID 3
//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
//!!! -------------------------------------------||||||||||||||||||||||||||||||||||||||||||| POSITIONAL ORDINAL-NUMBERED CALLING INTERFACE ||||||||||||||||||||| all iCustom() call MUST BE REVISED ____________________________ !!!
//--- indicator parameters -------------------------------------------||||||||||||||||||||||||||||||||||||||||||| POSITIONAL ORDINAL-NUMBERED CALLING INTERFACE ||||||||||||||||||||| all iCustom() call MUST BE REVISED ____________________________ !!!
//!!! -------------------------------------------||||||||||||||||||||||||||||||||||||||||||| POSITIONAL ORDINAL-NUMBERED CALLING INTERFACE ||||||||||||||||||||| all iCustom() call MUST BE REVISED ____________________________ !!!
//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! <<_MAINTAINED_SECTION_>>.END
任何其他方法在历史上都被证明更痛苦或更危险。
对于这个问题域，使用GlobalVariable*调用不是一个强大的用例，因为会出现许多副作用，并且这种代码值集成很容易在没有 EA 的情况下停止工作——能够检测到这样的（语义）失败。
在“内部”EA 中使用自定义指标逻辑是可能的，但代价是逻辑的完全重新设计，因为 EA 代码执行单元的行为方式与 MetaTrader4 终端代码执行中的自定义指标代码执行单元不同环境。公平地指出，由于 MQL4 语言（和终端）的修订，仅对 HFT 级项目或对延迟非常敏感的实施来说，在进入这个方向之前仔细决定利弊是有意义的。
于 2017-08-11T03:21:18.447 回答
0
有两种方法：
- 让这个变量成为一个缓冲区，并通过
- 写入 GlobalVariablesOfClientTerminal 这样的变量并将其作为 GV 读取。iCustom();
也可以在 EA 中移动指标的逻辑，在这种情况下，您将能够直接访问该参数，但这通常不是那么容易。
于 2017-08-10T09:10:11.130 回答
-1
使用全局变量在 EA 和指标之间传输 var 值。
于 2021-09-09T15:20:46.173 回答