IAsyncProcessingCallback インターフェイスの OnError メソッド

HRESULT OnError(
  BSTR          FileName,
  int           PageIndex,
  BSTR          ErrorMessage,
  VARIANT_BOOL* Cancel
);

void OnError(
  string   FileName,
  int      PageIndex,
  string   ErrorMessage,
  ref bool Cancel
);

Sub OnError( _
  FileName As String, _
  PageIndex As Integer, _
  ErrorMessage As String, _
  ByRef Cancel As Boolean _
)