Comtrol Multiport Modems Windows 98 Manuel d'utilisateur télécharger pdf (Page 51)

Opening Ports Higher Than COM10

To open up COM ports higher than COM10 a special named format is used with

CreateFile(): \\.\COM10 (when using the C language you need to double up the

backslashes: \\\\.\\COM10. This works only for 32-bit programs running under

Windows NT, 98/SE, or ME. 16-bit applications running under Windows NT, 98/

SE or ME also have this restriction.

COMMTIMEOUTS: GetCommTimeouts() and SetCommTimeouts() Structure

These features are implemented in a standard part of the operating system and

not in the port-driver, although it does rely on callback facilities built into the

driver. These timeouts should be used to avoid getting stuck forever in a read or

write operation when using the standard (non-overlapped) mode of operation.

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Comtrol Multiport Modems Windows 98 Manuel d'utilisateur Page 51