Platform SDK: Debugging and Error Handling

EXCEPTION_RECORD

The EXCEPTION_RECORD structure describes an exception.

typedef struct _EXCEPTION_RECORD { 
  DWORD ExceptionCode; 
  DWORD ExceptionFlags; 
  struct _EXCEPTION_RECORD *ExceptionRecord; 
  PVOID ExceptionAddress; 
  DWORD NumberParameters; 
  ULONG_PTR ExceptionInformation[EXCEPTION_MAXIMUM_PARAMETERS];
} EXCEPTION_RECORD, *PEXCEPTION_RECORD;

Members

ExceptionCode

Specifies the reason the exception occurred. This is the code generated by a hardware exception, or the code specified in the RaiseException function for a software-generated exception. Following are the exception codes likely to occur due to common programming errors:

Value	Meaning
EXCEPTION_ACCESS_VIOLATION	The thread tried to read from or write to a virtual address for which it does not have the appropriate access.
EXCEPTION_ARRAY_BOUNDS_EXCEEDED	The thread tried to access an array element that is out of bounds and the underlying hardware supports bounds checking.
EXCEPTION_BREAKPOINT	A breakpoint was encountered.
EXCEPTION_DATATYPE_MISALIGNMENT	The thread tried to read or write data that is misaligned on hardware that does not provide alignment. For example, 16-bit values must be aligned on 2-byte boundaries; 32-bit values on 4-byte boundaries, and so on.
EXCEPTION_FLT_DENORMAL_OPERAND	One of the operands in a floating-point operation is denormal. A denormal value is one that is too small to represent as a standard floating-point value.
EXCEPTION_FLT_DIVIDE_BY_ZERO	The thread tried to divide a floating-point value by a floating-point divisor of zero.
EXCEPTION_FLT_INEXACT_RESULT	The result of a floating-point operation cannot be represented exactly as a decimal fraction.
EXCEPTION_FLT_INVALID_OPERATION	This exception represents any floating-point exception not included in this list.
EXCEPTION_FLT_OVERFLOW	The exponent of a floating-point operation is greater than the magnitude allowed by the corresponding type.
EXCEPTION_FLT_STACK_CHECK	The stack overflowed or underflowed as the result of a floating-point operation.
EXCEPTION_FLT_UNDERFLOW	The exponent of a floating-point operation is less than the magnitude allowed by the corresponding type.
EXCEPTION_ILLEGAL_INSTRUCTION	The thread tried to execute an invalid instruction.
EXCEPTION_IN_PAGE_ERROR	The thread tried to access a page that was not present, and the system was unable to load the page. For example, this exception might occur if a network connection is lost while running a program over the network.
EXCEPTION_INT_DIVIDE_BY_ZERO	The thread tried to divide an integer value by an integer divisor of zero.
EXCEPTION_INT_OVERFLOW	The result of an integer operation caused a carry out of the most significant bit of the result.
EXCEPTION_INVALID_DISPOSITION	An exception handler returned an invalid disposition to the exception dispatcher. Programmers using a high-level language such as C should never encounter this exception.
EXCEPTION_NONCONTINUABLE_EXCEPTION	The thread tried to continue execution after a noncontinuable exception occurred.
EXCEPTION_PRIV_INSTRUCTION	The thread tried to execute an instruction whose operation is not allowed in the current machine mode.
EXCEPTION_SINGLE_STEP	A trace trap or other single-instruction mechanism signaled that one instruction has been executed.
EXCEPTION_STACK_OVERFLOW	The thread used up its stack.

Another exception code is likely to occur when debugging console processes. It does not arise because of a programming error. The DBG_CONTROL_C exception code occurs when CTRL+C is input to a console process that handles CTRL+C signals and is being debugged. This exception code is not meant to be handled by applications. It is raised only for the benefit of the debugger, and is raised only when a debugger is attached to the console process.

ExceptionFlags

Specifies the exception flags. This member can be either zero, indicating a continuable exception, or EXCEPTION_NONCONTINUABLE indicating a noncontinuable exception. Any attempt to continue execution after a noncontinuable exception causes the EXCEPTION_NONCONTINUABLE_EXCEPTION exception.

ExceptionRecord

Pointer to an associated EXCEPTION_RECORD structure. Exception records can be chained together to provide additional information when nested exceptions occur.

ExceptionAddress

Specifies the address where the exception occurred.

NumberParameters

Specifies the number of parameters associated with the exception. This is the number of defined elements in the ExceptionInformation array.

ExceptionInformation

Specifies an array of additional 32-bit arguments that describe the exception. The RaiseException function can specify this array of arguments. For most exception codes, the array elements are undefined. For the following exception code, the array elements are defined as follows:

Exception code	Array contents
EXCEPTION_ACCESS_VIOLATION	The first element of the array contains a read-write flag that indicates the type of operation that caused the access violation. If this value is zero, the thread attempted to read the inaccessible data. If this value is 1, the thread attempted to write to an inaccessible address. The second array element specifies the virtual address of the inaccessible data.

Requirements

  Windows NT/2000: Requires Windows NT 3.1 or later.
  Windows 95/98: Requires Windows 95 or later.
  Header: Declared in Winnt.h; include Windows.h.

EXCEPTION_RECORD

Members

Requirements

See Also