如何在程序中检测对方摘机。

tinderman 2003-04-03 03:37:48

用Modem向电话拔号，如何检测对方摘机。

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hjb8000 2003-04-04

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载波事件可以检测，猫在启动、接收到对方摘机、对方挂机时都有载波信号产生，如果收到震令铃后再收到载波事件代表与对方连通！！

hjb8000 2003-04-04

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其实也不难，不过下面的程序使用C++BUIDER写的，大致流程：
打开串口，设置串口响应事件时必须设置DCD响应事件
if ( !SetCommState(FhCom, &dcb) ||
!SetCommMask(FhCom, EV_RXCHAR |
//EV_BREAK |
//EV_CTS |
//EV_DSR |
//EV_ERR |
//EV_RING |
EV_TXEMPTY |
//EV_RXFLAG |
EV_RLSD ) ||

在检察串口事件WaitCommEvent(CommHandle, &dwEventMask, &eOverLapped);
判断dwEventMask事件中是否有DCD事件，如果有就给主线程中发消息，在该消息中处理即可
void __fastcall TCommThread::Execute()
{
DWORD dwEventMask;
while(true) {
dwEventMask = 0;
WaitCommEvent(CommHandle, &dwEventMask, &eOverLapped);
ClearCommError(CommHandle, &ErrWord, &comstat);
WaitForSingleObject(eOverLapped.hEvent, INFINITE);
FBytesInQue = comstat.cbInQue;
FBytesOutQue = comstat.cbOutQue;
if ( dwEventMask & EV_TXEMPTY ) { // Êä³ö»º³åÇø¿Õ
//PostMessageToThread( Owner->ThreadID, WM_OUTBUFFEREMPTY, 0 ,0L );
PostMessageToThread( Owner->DataHandleThread->ThreadID, WM_OUTBUFFEREMPTY, 0 ,0L );
}
if ( ( dwEventMask & EV_RXCHAR ) && CanInterrupt &&
( FBytesInQue >= FRThreshold ) ) { // ÊäÈë»º³åÇø½ÓÊÕµ½Ò»×Ö·û
CanInterrupt = false;
//PostMessageToThread( Owner->ThreadID, WM_OVERRTHRESHOLD,0,0);
PostMessageToThread( Owner->DataHandleThread->ThreadID, WM_OVERRTHRESHOLD,0,0);
}
if ( (dwEventMask & EV_RLSD )||
(dwEventMask & EV_BREAK )||
(dwEventMask & EV_CTS )||
(dwEventMask & EV_DSR )||
(dwEventMask & EV_ERR )||
(dwEventMask & EV_RING )||
(dwEventMask & EV_RXFLAG ) )
{
PostMessageToThread( Owner->DataHandleThread->ThreadID, WM_PHONERING,dwEventMask,0); //ÕýÔÚÕðÁå
}
} // while
}

qsfsea 2003-04-04