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    Language Basics
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    Operations and Expressions
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    Precedence Rules
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    Functions
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    Variables
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    Object-Oriented Programming
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    Updated MQL4
    Constants, Enumerations and Structures
    Chart Constants
    Types of Chart Events
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    Chart Properties
    Positioning Constants
    Chart Representation
    Examples of Working with the Chart
    Objects Constants
    Object Types
    OBJ_VLINE
    OBJ_HLINE
    OBJ_TREND
    OBJ_TRENDBYANGLE
    OBJ_CYCLES
    OBJ_CHANNEL
    OBJ_STDDEVCHANNEL
    OBJ_REGRESSION
    OBJ_PITCHFORK
    OBJ_GANNLINE
    OBJ_GANNFAN
    OBJ_GANNGRID
    OBJ_FIBO
    OBJ_FIBOTIMES
    OBJ_FIBOFAN
    OBJ_FIBOARC
    OBJ_FIBOCHANNEL
    OBJ_EXPANSION
    OBJ_RECTANGLE
    OBJ_TRIANGLE
    OBJ_ELLIPSE
    OBJ_ARROW_THUMB_UP
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    OBJ_ARROW_UP
    OBJ_ARROW_DOWN
    OBJ_ARROW_STOP
    OBJ_ARROW_CHECK
    OBJ_ARROW_LEFT_PRICE
    OBJ_ARROW_RIGHT_PRICE
    OBJ_ARROW_BUY
    OBJ_ARROW_SELL
    OBJ_ARROW
    OBJ_TEXT
    OBJ_LABEL
    OBJ_BUTTON
    OBJ_BITMAP
    OBJ_BITMAP_LABEL
    OBJ_EDIT
    OBJ_EVENT
    OBJ_RECTANGLE_LABEL
    Object Properties
    Methods of Object Binding
    Chart Corner
    Visibility of Objects
    Gann Objects
    Web Colors
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    Arrow codes
    Indicator Constants
    Price Constants
    Series Array Identifiers
    Smoothing Methods
    Indicators Lines
    Drawing Styles
    Custom Indicator Properties
    Environment State
    Client Terminal Properties
    Running MQL4 Program Properties
    Symbol Properties
    Account Properties
    Testing Statistics
    Trade Constants
    History Database Properties
    Order Properties
    Signal Properties
    Named Constants
    Predefined Macro Substitutions
    Mathematical Constants
    Numerical Type Constants
    Uninitialization Reason Codes
    Checking Object Pointer
    Other constants
    Data Structures
    Structure of the Date Type
    History Data Structure
    Structure for Current Prices
    Codes of Errors and Warnings
    Trade Server Return Codes
    Compiler Warnings
    Compilation Errors
    Runtime Errors
    Input/Output Constants
    File Opening Flags
    File Properties
    In-File Position
    Use of a Codepage
    MessageBox
    MQL4 programs
    Program Running
    Trade Permission
    Client Terminal Events
    Resources
    Call of Imported Functions
    Runtime Errors
    Operation of Programs in the Strategy Tester
    Predefined Variables
    _Digits
    _Point
    _LastError
    _Period
    _RandomSeed
    _StopFlag
    _Symbol
    _UninitReason
    Ask
    Bars
    Bid
    Close
    Digits
    High
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    Open
    Point
    Time
    Volume
    Common Functions
    Alert
    CheckPointer
    Comment
    CryptEncode
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    DebugBreak
    ExpertRemove
    GetPointer
    GetTickCount
    GetMicrosecondCount
    MessageBox
    PeriodSeconds
    PlaySound
    Print
    PrintFormat
    ResetLastError
    ResourceCreate
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    ResourceReadImage
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    SetUserError
    SendFTP
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    Sleep
    TerminalClose
    TesterStatistics
    TranslateKey
    WebRequest
    ZeroMemory
    Array Functions
    ArrayBsearch
    ArrayCopy
    ArrayCompare
    ArrayFree
    ArrayGetAsSeries
    ArrayInitialize
    ArrayFill
    ArrayIsDynamic
    ArrayIsSeries
    ArrayMaximum
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    ArrayRange
    ArrayResize
    ArraySetAsSeries
    ArraySize
    ArraySort
    ArrayCopyRates
    ArrayCopySeries
    ArrayDimension
    Conversion Functions
    CharToString
    CharArrayToString
    ColorToARGB
    ColorToString
    DoubleToString
    EnumToString
    IntegerToString
    ShortToString
    ShortArrayToString
    TimeToString
    NormalizeDouble
    StringToCharArray
    StringToColor
    StringToDouble
    StringToInteger
    StringToShortArray
    StringToTime
    StringFormat
    CharToStr
    DoubleToStr
    StrToDouble
    StrToInteger
    StrToTime
    TimeToStr
    Math Functions
    MathAbs
    MathArccos
    MathArcsin
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    MathCos
    MathExp
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    MathLog
    MathLog10
    MathMax
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    MathPow
    MathRand
    MathRound
    MathSin
    MathSqrt
    MathSrand
    MathTan
    MathIsValidNumber
    String Functions
    StringAdd
    StringBufferLen
    StringCompare
    StringConcatenate
    StringFill
    StringFind
    StringGetCharacter
    StringInit
    StringLen
    StringReplace
    StringSetCharacter
    StringSplit
    StringSubstr
    StringToLower
    StringToUpper
    StringTrimLeft
    StringTrimRight
    StringGetChar
    StringSetChar
    Date and Time
    TimeCurrent
    TimeLocal
    TimeGMT
    TimeDaylightSavings
    TimeGMTOffset
    TimeToStruct
    StructToTime
    Day
    DayOfWeek
    DayOfYear
    Hour
    Minute
    Month
    Seconds
    TimeDay
    TimeDayOfWeek
    TimeDayOfYear
    TimeHour
    TimeMinute
    TimeMonth
    TimeSeconds
    TimeYear
    Year
    Account Information
    AccountInfoDouble
    AccountInfoInteger
    AccountInfoString
    AccountBalance
    AccountCredit
    AccountCompany
    AccountCurrency
    AccountEquity
    AccountFreeMargin
    AccountFreeMarginCheck
    AccountFreeMarginMode
    AccountLeverage
    AccountMargin
    AccountName
    AccountNumber
    AccountProfit
    AccountServer
    AccountStopoutLevel
    AccountStopoutMode
    Checkup
    GetLastError
    IsStopped
    UninitializeReason
    MQLInfoInteger
    MQLInfoString
    MQLSetInteger
    TerminalInfoInteger
    TerminalInfoDouble
    TerminalInfoString
    Symbol
    Period
    Digits
    Point
    IsConnected
    IsDemo
    IsDllsAllowed
    IsExpertEnabled
    IsLibrariesAllowed
    IsOptimization
    IsTesting
    IsTradeAllowed
    IsTradeContextBusy
    IsVisualMode
    TerminalCompany
    TerminalName
    TerminalPath
    Market Info
    MarketInfo
    SymbolsTotal
    SymbolName
    SymbolSelect
    SymbolInfoDouble
    SymbolInfoInteger
    SymbolInfoString
    SymbolInfoTick
    SymbolInfoSessionQuote
    SymbolInfoSessionTrade
    Timeseries and Indicators Access
    Indexing Direction in Arrays, Buffers and Timeseries
    SeriesInfoInteger
    RefreshRates
    CopyRates
    CopyTime
    CopyOpen
    CopyHigh
    CopyLow
    CopyClose
    CopyTickVolume
    Bars
    iBars
    iBarShift
    iClose
    iHigh
    iHighest
    iLow
    iLowest
    iOpen
    iTime
    iVolume
    Chart Operations
    ChartApplyTemplate
    ChartSaveTemplate
    ChartWindowFind
    ChartTimePriceToXY
    ChartXYToTimePrice
    ChartOpen
    ChartFirst
    ChartNext
    ChartClose
    ChartSymbol
    ChartPeriod
    ChartRedraw
    ChartSetDouble
    ChartSetInteger
    ChartSetString
    ChartGetDouble
    ChartGetInteger
    ChartGetString
    ChartNavigate
    ChartID
    ChartIndicatorDelete
    ChartIndicatorName
    ChartIndicatorsTotal
    ChartWindowOnDropped
    ChartPriceOnDropped
    ChartTimeOnDropped
    ChartXOnDropped
    ChartYOnDropped
    ChartSetSymbolPeriod
    ChartScreenShot
    Period
    Symbol
    WindowBarsPerChart
    WindowExpertName
    WindowFind
    WindowFirstVisibleBar
    WindowHandle
    WindowIsVisible
    WindowOnDropped
    WindowPriceMax
    WindowPriceMin
    WindowPriceOnDropped
    WindowRedraw
    WindowScreenShot
    WindowTimeOnDropped
    WindowsTotal
    WindowXOnDropped
    WindowYOnDropped
    Trade Functions
    OrderClose
    OrderCloseBy
    OrderClosePrice
    OrderCloseTime
    OrderComment
    OrderCommission
    OrderDelete
    OrderExpiration
    OrderLots
    OrderMagicNumber
    OrderModify
    OrderOpenPrice
    OrderOpenTime
    OrderPrint
    OrderProfit
    OrderSelect
    OrderSend
    OrdersHistoryTotal
    OrderStopLoss
    OrdersTotal
    OrderSwap
    OrderSymbol
    OrderTakeProfit
    OrderTicket
    OrderType
    Trade Signals
    SignalBaseGetDouble
    SignalBaseGetInteger
    SignalBaseGetString
    SignalBaseSelect
    SignalBaseTotal
    SignalInfoGetDouble
    SignalInfoGetInteger
    SignalInfoGetString
    SignalInfoSetDouble
    SignalInfoSetInteger
    SignalSubscribe
    SignalUnsubscribe
    Global Variables of the Terminal
    GlobalVariableCheck
    GlobalVariableTime
    GlobalVariableDel
    GlobalVariableGet
    GlobalVariableName
    GlobalVariableSet
    GlobalVariablesFlush
    GlobalVariableTemp
    GlobalVariableSetOnCondition
    GlobalVariablesDeleteAll
    GlobalVariablesTotal
    File Functions
    FileFindFirst
    FileFindNext
    FileFindClose
    FileIsExist
    FileOpen
    FileClose
    FileCopy
    FileDelete
    FileMove
    FileFlush
    FileGetInteger
    FileIsEnding
    FileIsLineEnding
    FileReadArray
    FileReadBool
    FileReadDatetime
    FileReadDouble
    FileReadFloat
    FileReadInteger
    FileReadLong
    FileReadNumber
    FileReadString
    FileReadStruct
    FileSeek
    FileSize
    FileTell
    FileWrite
    FileWriteArray
    FileWriteDouble
    FileWriteFloat
    FileWriteInteger
    FileWriteLong
    FileWriteString
    FileWriteStruct
    FolderCreate
    FolderDelete
    FolderClean
    FileOpenHistory
    Custom Indicators
    HideTestIndicators
    IndicatorSetDouble
    IndicatorSetInteger
    IndicatorSetString
    SetIndexBuffer
    IndicatorBuffers
    IndicatorCounted
    IndicatorDigits
    IndicatorShortName
    SetIndexArrow
    SetIndexDrawBegin
    SetIndexEmptyValue
    SetIndexLabel
    SetIndexShift
    SetIndexStyle
    SetLevelStyle
    SetLevelValue
    Object Functions
    ObjectCreate
    ObjectName
    ObjectDelete
    ObjectsDeleteAll
    ObjectFind
    ObjectGetTimeByValue
    ObjectGetValueByTime
    ObjectMove
    ObjectsTotal
    ObjectGetDouble
    ObjectGetInteger
    ObjectGetString
    ObjectSetDouble
    ObjectSetInteger
    ObjectSetString
    TextSetFont
    TextOut
    TextGetSize
    ObjectDescription
    ObjectGet
    ObjectGetFiboDescription
    ObjectGetShiftByValue
    ObjectGetValueByShift
    ObjectSet
    ObjectSetFiboDescription
    ObjectSetText
    ObjectType
    Technical Indicators
    iAC
    iAD
    iADX
    iAlligator
    iAO
    iATR
    iBearsPower
    iBands
    iBandsOnArray
    iBullsPower
    iCCI
    iCCIOnArray
    iCustom
    iDeMarker
    iEnvelopes
    iEnvelopesOnArray
    iForce
    iFractals
    iGator
    iIchimoku
    iBWMFI
    iMomentum
    iMomentumOnArray
    iMFI
    iMA
    iMAOnArray
    iOsMA
    iMACD
    iOBV
    iSAR
    iRSI
    iRSIOnArray
    iRVI
    iStdDev
    iStdDevOnArray
    iStochastic
    iWPR
    Working with Events
    EventSetMillisecondTimer
    EventSetTimer
    EventKillTimer
    EventChartCustom
    Obsolete functions
    List of MQL4 Functions
    List of MQL4 Constants
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mql4 Documentation

Constants, Enumerations and Structures

Input/Output Constants

Input/Output Constants

Input and Output Constants

Constants:

File opening flags
File properties
Positioning inside a file
Code page usage
MessageBox

Last updated on 2026-06-26

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