Detecting Data on the Communications Port

ID: Q118625

3.10 3.50 3.51 4.00 | 4.00

WINDOWS NT          | WINDOWS

The information in this article applies to:

• Microsoft Win32 Application Programming Interface (API) included with:

      - Microsoft Windows NT versions 3.1, 3.5, 3.51, and 4.0
      - Microsoft Windows 95 version 4.0
  

To detect whether there is any data available on the communications (COM) port without calling ReadFile(), use the ClearCommError() API. The field COMSTAT.CbInQue contains the number of bytes not yet read by a call to ReadFile().

Additional reference words: 3.10 3.50 3.51 4.00 95 KBCategory: kbprg KBSubcategory: BseCommapi

Keywords          : kbAPI kbKernBase kbGrpKernBase 
Version           : 3.10 3.50 3.51 4.00 | 4.00
Platform          : NT WINDOWS

Last Reviewed: December 18, 1996