IDebugEventCallbacks::ChangeSymbolState method (dbgeng.h)

The ChangeSymbolState callback method is called by the engine when the symbol state changes.

Syntax

HRESULT ChangeSymbolState(
  [in] ULONG   Flags,
  [in] ULONG64 Argument
);

Parameters

[in] Flags

Specifies a bit-set indicating the nature of the change to the symbol state. The following bit flags might be set.

Value	Description
DEBUG_CSS_LOADS	The engine has loaded some module symbols.
DEBUG_CSS_UNLOADS	The engine has unloaded some module symbols.
DEBUG_CSS_SCOPE	The current symbol scope has changed.
DEBUG_CSS_PATHS	The executable image, source , or symbol search paths have changed.
DEBUG_CSS_SYMBOL_OPTIONS	The symbol options have changed.
DEBUG_CSS_TYPE_OPTIONS	The type options have changed.

[in] Argument

Provides additional information about the change to the symbol state. If more than one bit flag is set in the Flags parameter, the Argument parameter is not used. Otherwise, the value of Argument depends on the value of Flags:

DEBUG_CSS_LOADS

The value of Argument is the base location (in the target's memory address space) of the module image that the engine loaded symbols for.

DEBUG_CSS_UNLOADS

The value of Argument is the base location (in the target's memory address space) of the module image that the engine unloaded symbols for. If the engine unloaded symbols for more than one image, the value of Argument is zero.

DEBUG_CSS_SCOPE

The value of Argument is zero.

DEBUG_CSS_PATHS

The value of Argument is zero.

DEBUG_CSS_SYMBOL_OPTIONS

The value of Argument is the symbol options.

DEBUG_CSS_TYPE_OPTIONS

The value of Argument is zero.

Return value

The return value is ignored by the engine unless it indicates a remote procedure call error; in this case the client, with which this IDebugEventCallbacks object is registered, is disabled.

Remarks

This method is only called by the engine if the DEBUG_EVENT_CHANGE_SYMBOL_STATE flag is set in the mask returned by IDebugEventCallbacks::GetInterestMask.

For more information about handling events, see Monitoring Events.

Requirements

Requirement	Value
Target Platform	Desktop
Header	dbgeng.h (include Dbgeng.h)