MQL4 Reference 
Checkup IsLibrariesAllowed
| bool IsLibrariesAllowed( |
) |
Returns TRUE if the expert can call library function, otherwise returns FALSE.
See also IsDllsAllowed(), IsTradeAllowed().
Sample:
#import "somelibrary.ex4"
int somefunc();
...
...
if(IsLibrariesAllowed()==false)
{
Print("Library call is not allowed.");
return(0);
}
// expert body that calls external DLL functions
somefunc();
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