MQL4 Reference 
Checkup GetLastError
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The function returns the last occurred error, then the value of special
last_error variable where the last error code is stored will be zeroized.
So, the next call for GetLastError() will return 0.
Sample:
int err;
int handle=FileOpen("somefile.dat", FILE_READ|FILE_BIN);
if(handle<1)
{
err=GetLastError();
Print("error(",err,"): ",ErrorDescription(err));
return(0);
}
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