Re: GetLastError reported the following

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William DePalo [MVP VC++] wrote: 
In my WriteFile(Handle, inbuff, bufflenght, &byteswritten, NULL), the last
parameter is NULL.  Is this why it is complaining?


Because the device was initially opened for overlapped I/O you must pass a a pointer to validly filled in overlapped structure as the last parameter.


In TAPI, where do you declare where a function is to use Overlapped or
non-Overlapped Reads and Writes?


You don't because you don't open the device. The device was earlier opened, however, for overlapped access. 

Note that Unimodem only support Overlapped mode.

--
Michael Dunn (Microsoft MVP) is a TAPI Developer and Tester
TAPI web page:  http://www.rainyjay.com/tapi/tapi.htm
TAPI discussions belong in the newsgroup, and not in private email.
"I'm not insane, I'm just choosy about the reality I accept."
.

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