圣母百花大教堂怎么过:求助：帮忙翻译一段有关计算机专业的英文

DAT_EVENT Handling Errors
One of the most common problems between a data source and application is the management of DG_CONTROL / DAT_EVENT / MSG_PROCESSEVENT. The symptoms are not immediately obvious, so it is worth mentioning them to assist new developers in quickly
identifying and solving the problem.
Cannot use TAB or Keyboard Shortcuts to Navigate TWAIN Dialog
The cause of this can be one of two things. Either the application is not forwarding all messages to TWAIN through the DAT_EVENT mechanism, or the data source is not properly processing the DAT_EVENT messages. (Windows: calling IsDialogMessage for each forwarded message with TWAIN Dialog handle) TWAIN Dialog Box Combo Boxes cannot be opened, Edit boxes produce multiple chars per keystroke This case is caused by processing TWAIN Dialog Messages twice. Either the data
source has not returned the proper return code in response to DAT_EVENT calls (Windows: TWRC_DSEVENT when IsDialogMessage returns TRUE), or the application is ignoring the return code.
This is not a problem when data source operates through TWAIN Thunker Problems with the application handling of these messages are not often detected if the data source is operating through the TWAIN Thunking mechanism. This is because the Thunker process has a separate Window and Message pump that properly dispatch DAT_EVENT messages to the data source. Any mistake in application handling will pass without notice since all DAT_EVENT calls will return TWRC_NOTDSEVENT.
(with the exception of important messages such as MSG_XFERREADY.)
Problem seems erratic, keyboard shortcuts and Tab key work for Message Boxes, but not TWAIN Dialog This observation often further confuses the issue. In Windows, a standard Message box
is Modal, and operates from a local message pump until the user closes it. All messages are properly dispatched to the message box since it does not rely on the application message pump. The TWAIN Dialog is slightly different since it is
implemented Modeless. There is no easy way to duplicate Modal behavior for the TWAIN Dialog.