EExternal Class

EExternal is the exception class that captures external error information.

Pascal

EExternal = class(Exception);

C++

class EExternal : public Exception;

File

SysUtils

Description

EExternal is the ancestor of all exception classes that represent external run time errors.

Note: Under Windows, EExternal classes represent Win32 exception codes. The ExceptionRecord member points to a Win32 exception record:

//Delphi syntax

Copy Code

type
PExceptionRecord = ^TExceptionRecord;
TExceptionRecord = record
  ExceptionCode: Cardinal;
  ExceptionFlags: Cardinal;
  ExceptionRecord: PExceptionRecord;
  ExceptionAddress: Pointer;
  NumberParameters: Cardinal;
  ExceptionInformation: array[0..14] of Cardinal;
end;

ExceptionRecord: PExceptionRecord;

//C++ syntax

Copy Code

struct TExceptionRecord;
typedef TExceptionRecord *PExceptionRecord;
struct TExceptionRecord
{
unsigned ExceptionCode;
unsigned ExceptionFlags;
  TExceptionRecord *ExceptionRecord;
void *ExceptionAddress;
unsigned NumberParameters;
unsigned ExceptionInformation[15];
} ;

Note: Under Linux, EExternal classes represent various runtime errors. EExternal has three fields with exception information:

ExceptionAddress, which contains the address of the instruction that caused the error;

AccessAddress, the address that was being accessed when the error occurred;

SignalNumber, for exceptions raised by Linux signals.