MQL4 Reference 
Constants, Enumerations and Structures Named Constants Uninitialization Reason Codes
Uninitialization Reason Codes
Uninitialization reason codes are returned by the UninitializeReason() function. The possible values are the following:
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REASON_PROGRAM
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0
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Expert Advisor terminated its operation by calling the ExpertRemove() function
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REASON_REMOVE
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1
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Program has been deleted from the chart
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REASON_RECOMPILE
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2
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Program has been recompiled
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REASON_CHARTCHANGE
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3
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Symbol or chart period has been changed
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REASON_CHARTCLOSE
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4
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Chart has been closed
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REASON_PARAMETERS
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5
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Input parameters have been changed by a user
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REASON_ACCOUNT
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6
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Another account has been activated or reconnection to the trade server has occurred due to changes in the account settings
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REASON_TEMPLATE
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7
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A new template has been applied
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REASON_INITFAILED
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8
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This value means that OnInit() handler has returned a nonzero value
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REASON_CLOSE
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9
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Terminal has been closed
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The uninitialization reason code is also passed as a parameter of the predetermined function OnDeinit(const int reason).
The codes 1(REASON_REMOVE) and 2(REASON_RECOMPILE) are implemented for the indicators.
Example:
//+------------------------------------------------------------------+
//| get text description |
//+------------------------------------------------------------------+
string getUninitReasonText(int reasonCode)
{
string text="";
//---
switch(reasonCode)
{
case REASON_ACCOUNT:
text="Account was changed";break;
case REASON_CHARTCHANGE:
text="Symbol or timeframe was changed";break;
case REASON_CHARTCLOSE:
text="Chart was closed";break;
case REASON_PARAMETERS:
text="Input-parameter was changed";break;
case REASON_RECOMPILE:
text="Program "+__FILE__+" was recompiled";break;
case REASON_REMOVE:
text="Program "+__FILE__+" was removed from chart";break;
case REASON_TEMPLATE:
text="New template was applied to chart";break;
default:text="Another reason";
}
//---
return text;
}
//+------------------------------------------------------------------+
//| Expert deinitialization function |
//+------------------------------------------------------------------+
void OnDeinit(const int reason)
{
//--- The first way to get the uninitialization reason code
Print(__FUNCTION__,"_Uninitalization reason code = ",reason);
//--- The second way to get the uninitialization reason code
Print(__FUNCTION__,"_UninitReason = ",getUninitReasonText(_UninitReason));
} |
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