Threads and Tapi

I've been experimenting on TAPI programming. I'm trying to write an application that can answer incoming calls. When I run the code below, the application just waits. So when I call my telephone, the application fails to answer the incoming call. Does anyone know what I'm doing wrong here?


#include <tapi.h>
#include <windows.h>
#include <iostream.h>
#include <stdio.h>

//Global declarations
LONG lres;
HLINEAPP phLineApp;
HLINE hLine;
HCALL hCall;
HANDLE eventReply;
HANDLE tapiEvent;
HANDLE eventThread;

DWORD dwNumDevs;
DWORD dwApiVer = 0x00020002;
DWORD dwLowApiVer = 0x00010004;
DWORD dwDeviceId;
DWORD mediaMode;
DWORD dwNegApiVer;
DWORD i;
DWORD tapiMessage;

LINEINITIALIZEEXPARAMS lineParam;
LINEEXTENSIONID extId;
LINEDEVCAPS *lDevCap;

bool boolres = FALSE;


//Tapi Event Thread and Routines
DWORD WINAPI tapiThread(LPVOID lpThreadParam)
{
      while(TRUE)
      {
            DWORD dwStatus = WaitForSingleObject(tapiEvent, 10);

            if(dwStatus == WAIT_OBJECT_0)
            {
                  LINEMESSAGE lMessage;
                  lres = lineGetMessage(phLineApp, &lMessage,0);
                  if(lres == 0) cout << "Got line message\n";
                  else cout << "Error : Cannot get line message\n";

                  if(lMessage.dwParam1==LINECALLSTATE_OFFERING)
                  {
                        hCall = (HCALL)lMessage.hDevice;
                        tapiMessage = LINECALLSTATE_OFFERING;
                        SetEvent(eventReply);
                        break;
                  }

            }
      }

      return 0;
}



//Main
int main()
{
      
      lineParam.dwTotalSize = sizeof(LINEINITIALIZEEXPARAMS);
      lineParam.dwOptions = LINEINITIALIZEEXOPTION_USEEVENT;

      
      //Create Event
      eventReply = CreateEvent(NULL, FALSE, FALSE, NULL);

      if(eventReply != NULL) cout << "Event created\n";

      else cout << "Error : Can't create event\n";


      //Initialize TAPI
      lres = lineInitializeEx(&phLineApp, NULL, NULL, "TAPI Test",
                                          &dwNumDevs, &dwApiVer, &lineParam);

      if(lres == 0) cout << "TAPI initialized\n";

      else cout << "Error : TAPI not initialized\n";


      //Get event handle
      tapiEvent = lineParam.Handles.hEvent;


      //Event monitoring
      DWORD dwThreadId, dwThrdParam = 1;
      eventThread = CreateThread(NULL, 0, tapiThread, &dwThrdParam, 0, &dwThreadId);

      if(eventThread == NULL) cout << "Error : Can't create thread\n" << GetLastError() << endl;


      //Select valid line device
      for(i=0; i<dwNumDevs; i++)
      {
            //Negotiate Api Version
            lres = lineNegotiateAPIVersion(phLineApp, i, dwLowApiVer, dwApiVer, &dwNegApiVer, &extId);

            if(lres == 0)
            {
                  cout << "API version negotiated\n";
                  
                  //Allocate sufficient memory
                  lDevCap = (LINEDEVCAPS *)malloc(sizeof(LINEDEVCAPS)+1024);
                  
                  if(lDevCap == NULL) cout << "Can't allocate memory\n";

                  lDevCap->dwTotalSize = sizeof(LINEDEVCAPS)+1024;
                  
                  do
                  {
                        //Get device capabilites
                        lres = lineGetDevCaps(phLineApp, i, dwNegApiVer, 0, lDevCap);

                        if(lres == 0) cout << "Got device capabilities\n";
                        
                        if(lres != 0) cout << "Error : Cannot get device capabilites\n";
                        
                        if(lDevCap->dwNeededSize > lDevCap->dwTotalSize)
                              lDevCap = (LINEDEVCAPS *)realloc(lDevCap, lDevCap->dwNeededSize);

                        else boolres = TRUE;                        
                  }

                  while(!boolres);
                  
                  if(lDevCap->dwMediaModes & (LINEMEDIAMODE_INTERACTIVEVOICE|LINEMEDIAMODE_DATAMODEM))
                  {
                        dwDeviceId = i;
                        mediaMode = lDevCap->dwMediaModes;
                        cout << "Line " << dwDeviceId << " selected\n";
                  }

                  else cout <<"Error : No line is selected\n";
            }

            else cout << "Error : API version not negotiated\n";
      }
      
      
      //Open the selected line
      lres = lineOpen(phLineApp, dwDeviceId, &hLine, dwNegApiVer, 0, 1,
                              LINECALLPRIVILEGE_OWNER, mediaMode, NULL);

      if(lres == 0) cout << "Line is opened\n";

      else cout << "Error : Line not opened\n";

      
      //Event notification
      lres = lineSetStatusMessages(hLine, 0x1ffffff, 0);

      if(lres == 0) cout << "Success : lineSetStatusMessages\n";

      else cout << "Error : Can't set status messages\n";

      
      //Wait for notification
      while(1)
      {
            WaitForSingleObject(eventReply, INFINITE);
            if(tapiMessage == LINECALLSTATE_OFFERING)
            {
                  cout << "Answering call.....\n";
                  lres = lineAnswer(hCall, NULL, 0);
                  if(lres == 0) cout << "Call answered\n";
                  else cout << "Error : Can't answer call\n";
                  break;
            }
      }

      return 0;

}