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MQL4 文档
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Constants, Enumerations and Structures
Named Constants
Predefined Macro Substitutions

Predefined Macro Substitutions

预定义的宏替换

为了简化调试过程并获取有关mql4程序运行的信息，有一些特殊的宏常量，这些常量在编译时设置。使用这些常量最简单的方法是通过Print()函数输出其值，如示例所示。

常量描述
__DATE__文件编译日期，不包括时间（小时、分钟和秒均为0）
__DATETIME__文件编译的日期和时间
__LINE__源代码中包含宏的行号
__FILE__当前正在编译的文件的名称
__PATH__当前正在编译的文件的绝对路径
__FUNCTION__宏所在函数的名称
__FUNCSIG__宏所在函数签名。记录函数的完整描述有助于识别重载函数
__MQLBUILD__, __MQL4BUILD__编译器构建编号

示例：

#property copyright "Copyright © 2009, MetaQuotes Software Corp."
#property link      "https://www.metaquotes.net"
//+------------------------------------------------------------------+
//| Expert initialization function                                   |
//+------------------------------------------------------------------+
void OnInit()
  {
//--- an example of information output at Expert Advisor initialization
   Print(" __FUNCTION__ = ",__FUNCTION__,"  __LINE__ = ",__LINE__);
//--- set the interval between the timer events
   EventSetTimer(5);
//---
  }
//+------------------------------------------------------------------+
//| Expert deinitialization function                                 |
//+------------------------------------------------------------------+
void OnDeinit(const int reason)
  {
//--- an example of information output at Expert Advisor deinitialization
   Print(" __FUNCTION__ = ",__FUNCTION__,"  __LINE__ = ",__LINE__);
//---
  }
//+------------------------------------------------------------------+
//| Expert tick function                                             |
//+------------------------------------------------------------------+
void OnTick()
  {
//--- information output at tick receipt
   Print(" __MQLBUILD__ = ",__MQLBUILD__,"  __FILE__ = ",__FILE__);
   Print(" __FUNCTION__ = ",__FUNCTION__,"  __LINE__ = ",__LINE__);
   test1(__FUNCTION__);
   test2();
//---
  }
//+------------------------------------------------------------------+
//| test1                                                            |
//+------------------------------------------------------------------+
void test1(string par)
  {
//--- information output inside the function
   Print(" __FUNCTION__ = ",__FUNCTION__,"  __LINE__ = ",__LINE__," par = ",par);
  }
//+------------------------------------------------------------------+
//| test2                                                            |
//+------------------------------------------------------------------+
void test2()
  {
//--- information output inside the function
   Print(" __FUNCTION__ = ",__FUNCTION__,"  __LINE__ = ",__LINE__);
  }
//+------------------------------------------------------------------+
//| OnTimer event handler                                            |
//+------------------------------------------------------------------+
void OnTimer()
  {
//---
   Print(" __FUNCTION__ = ",__FUNCTION__,"  __LINE__ = ",__LINE__);
   test1(__FUNCTION__);
  }
//+------------------------------------------------------------------+
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Mathematical Constants