Solved

TAPI APIs failing

Posted on 1997-04-07
2
315 Views
Last Modified: 2013-12-03
I am trying to use TAPI 2.0 with I/O completion ports. The following code returns LINEERR_OPERATIONUNAVAIL

DWORD dwNumDevices = 0;
DWORD dwAPIVersion = TAPI_CURRENT_VERSION;
LINEINITIALIZEEXPARAMS parms;
parms.dwTotalSize = sizeof(LINEINITIALIZEEXPARAMS);
parms.dwOptions = LINEINITIALIZEEXOPTION_USECOMPLETIONPORT;
parms.dwCompletionKey = 1;
parms.Handles.hCompletionPort = comp;

long rc = lineInitializeEx(&myLineApp,
                     GetModuleHandle(0),
                     0,
                     0,
                     &dwNumDevices,
                     &dwAPIVersion,
                       &parms);

I can successfully use lineInialize, but I'd much rather use   I/O completion ports or event handles than the hidden window method of event notification.

Bill Weston

0
Comment
Question by:Bill Weston
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 

Author Comment

by:Bill Weston
ID: 1334459
Edited text of question
0
 
LVL 1

Accepted Solution

by:
edtmihu earned 100 total points
ID: 1334460
I tried this:
HANDLE hFile = CreateFile( _T( "C:\\T.T" ), GENERIC_WRITE | GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, CREATE_ALWAYS, FILE_FLAG_OVERLAPPED, NULL );

HANDLE comp = ::CreateIoCompletionPort ( hFile, NULL, 1, 0 );
LINEINITIALIZEEXPARAMS lip;
::ZeroMemory( &lip, sizeof( lip ) );
lip.dwTotalSize = sizeof( lip );
lip.dwOptions = LINEINITIALIZEEXOPTION_USECOMPLETIONPORT;
lip.dwCompletionKey = 1;
lip.Handles.hCompletionPort = comp;
pTapi->hLineApp = 0;
pTapi->dwNumDevs = 0;
pTapi->dwAPIVersion = 0x00020000;

LONG err = ::lineInitializeEx( &pTapi->hLineApp, AfxGetApp()->m_hInstance, 0, AfxGetApp()->m_pszAppName, &pTapi->dwNumDevs, &pTapi->dwAPIVersion, &lip );

This worked for me. I'm using VC++ 4.2b. I have UNICODE defined.
I only checked the return value from ::lineInitializeEx(...), nothing more.

I use events myself. Like this:
LINEINITIALIZEEXPARAMS lip;
::ZeroMemory( &lip, sizeof( lip ) );
lip.dwTotalSize = sizeof( lip );
lip.dwOptions = LINEINITIALIZEEXOPTION_USEEVENT;
pTapi->hLineApp = 0;
pTapi->dwNumDevs = 0;
pTapi->dwAPIVersion = 0x00020000;

LONG err = ::lineInitializeEx( &pTapi->hLineApp, AfxGetApp()->m_hInstance, 0, AfxGetApp()->m_pszAppName, &pTapi->dwNumDevs, &pTapi->dwAPIVersion, &lip );
.
Check err
.
open line devices and stuff
.
while ( 1 )
 {
 DWORD dwEvent = WaitForMultipleObjects( 2, pTapi->hEvents, FALSE, INFINITE );
}
etc.
Works great.
Hope this helped

Regards/Michael
0

Featured Post

Salesforce Has Never Been Easier

Improve and reinforce salesforce training & adoption using WalkMe's digital adoption platform. Start saving on costly employee training by creating fast intuitive Walk-Thrus for Salesforce. Claim your Free Account Now

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article describes a technique for converting RTF (Rich Text Format) data to HTML and provides C++ source that does it all in just a few lines of code. Although RTF is coming to be considered a "legacy" format, it is still in common use... po…
With most software applications trying to cater to multiple user needs nowadays, the focus is to make them as configurable as possible. For e.g., when creating Silverlight applications which will connect to WCF services, the service end point usuall…
This is Part 3 in a 3-part series on Experts Exchange to discuss error handling in VBA code written for Excel. Part 1 of this series discussed basic error handling code using VBA. http://www.experts-exchange.com/videos/1478/Excel-Error-Handlin…
There's a multitude of different network monitoring solutions out there, and you're probably wondering what makes NetCrunch so special. It's completely agentless, but does let you create an agent, if you desire. It offers powerful scalability …

631 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question