ulErrorCode (ULONG)

      Error code.

      A constant describing the type of error that occurred. The application can also receive some of these error constants in the ulReserved parameter of messages it has sent to the Help Manager.

      The error constants are:

      HMERR_LOAD_DLL

        The resource DLL was unable to be loaded.
      HMERR_NO_FRAME_WND_IN_CHAIN
        There is no frame window in the window chain from which to find or set the associated help instance.
      HMERR_INVALID_ASSOC_APP_WND
        The application window handle specified on the WinAssociateHelpInstance function is not a valid window handle.
      HMERR_INVALID_ASSOC_HELP_INST
        The help instance handle specified on the WinAssociateHelpInstance function is not a valid window handle.
      HMERR_INVALID_DESTROY_HELP_INST
        The window handle specified as the help instance to destroy is not of the help instance class.
      HMERR_NO_HELP_INST_IN_CHAIN
        The parent or owner chain of the application window specified does not have an associated help instance.
      HMERR_INVALID_HELP_INSTANCE_HDL
        The handle specified to be a help instance does not have the class name of a Help Manager instance.
      HMERR_INVALID_QUERY_APP_WND
        The application window specified on a WinQueryHelpInstance function is not a valid window handle.
      HMERR_HELP_INST_CALLED_INVALID
        The handle of the instance specified on a call to the Help Manager does not have the class name of a Help Manager instance.
      HMERR_HELPTABLE_UNDEFINE
        The application did not provide a help table for context-sensitive help.
      HMERR_HELP_INSTANCE_UNDEFINE
        The help instance handle specified is invalid.
      HMERR_HELPITEM_NOT_FOUND
        Context-sensitive help was requested but the ID of the main help item specified was not found in the help table.
      HMERR_INVALID_HELPSUBITEM_SIZE
        The help subtable item size is less than 2.
      HMERR_HELPSUBITEM_NOT_FOUND
        Context-sensitive help was requested but the ID of the help item specified was not found in the help subtable.
      HMERR_INDEX_NOT_FOUND
        The index is not in the library file.
      HMERR_CONTENT_NOT_FOUND
        The library file does not have any content.
      HMERR_OPEN_LIB_FILE
        The library file cannot be opened.
      HMERR_READ_LIB_FILE
        The library file cannot be read.
      HMERR_CLOSE_LIB_FILE
        The library file cannot be closed.
      HMERR_INVALID_LIB_FILE
        Improper library file provided.
      HMERR_NO_MEMORY
        Unable to allocate the requested amount of memory.
      HMERR_ALLOCATE_SEGMENT
        Unable to allocate a segment of memory for memory allocation requests from the Help Manager.
      HMERR_FREE_MEMORY
        Unable to free allocated memory.
      HMERR_PANEL_NOT_FOUND
        Unable to find the requested help window.
      HMERR_DATABASE_NOT_OPEN
        Unable to read the unopened database.

      ulReserved (ULONG)

        Reserved value, should be 0.

      ulReserved (ULONG)

        Reserved value, should be 0.

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