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分享UDP组播，完成端口，双网卡收不到数据？各位大哥，帮帮忙？
各位大哥：
小弟我写了一个网络通信程序，通过完成端口在指定的网卡上接收网络上传输过来的语音数据，现在情况是：
1：各主机均配置了两张网卡，其中一张网卡由该程序使用，另一张网卡其他程序在用；
2：程序在大部分客户端上运行都正常，唯独在其中一个客户端上GetQueuedCompletionStatus该函数不返回，若该客户端把另一张网卡的网线拔掉，或者禁用掉该网卡，启动软件工作正常。在工作过程中插上另一张网卡的网线也没有问题。但是如果在程序启动前两张网卡都在工作，则GetQueuedCompletionStatus不返回。
主要代码如下：
调用Create函数的代码：
m_Receive.Create(uLocalPort,lpDstStr,0, lpBindAddr)
uLocalPort：组播端口
lpDstStr：组播地址
lpBindAddr：本机上要绑定的网卡地址
bool CUdpSocket::Create(USHORT uLocalPort,LPCTSTR lpDstAddr,USHORT uDstPort,LPCTSTR lpBindAddr/*=NULL*/)
{
if ( htons(uLocalPort) == m_stLclAddr.sin_port
&& m_stDstAddr.sin_addr.s_addr == inet_addr(lpDstAddr)
&& m_stDstAddr.sin_port == htons(uDstPort))
{
return true ;
}
//*/
if (!CreateSocket(uLocalPort,lpBindAddr))
return false ;
/* Assign our destination address */
m_stDstAddr.sin_family = AF_INET;
m_stDstAddr.sin_addr.s_addr = inet_addr(lpDstAddr);
m_stDstAddr.sin_port = htons(uDstPort);
//广播
if(strstr(lpDstAddr,"255"))
{
BOOL bEnable = TRUE ;
int nRes = setsockopt(m_socket,SOL_SOCKET,SO_BROADCAST,(const char*)&bEnable,sizeof(bEnable));
}
//
else
{
// note the 2 says how many concurrent cpu bound threads to allow thru
// this should be tunable based on the requests. CPU bound requests will
// really really honor this.
//
JoinMultiCastGroup(lpDstAddr,uDstPort);
}
//* Disable loopback */
//*/
BOOL fFlag = FALSE;
int nRet = setsockopt(m_socket,
IPPROTO_IP,
IP_MULTICAST_LOOP,
(char *)&fFlag,
sizeof(fFlag));
if (nRet == SOCKET_ERROR) {
printf ("setsockopt() IP_MULTICAST_LOOP failed, Err: %d\n",
WSAGetLastError());
return false ;
}
//*/
//
return CreateCompleteIO();
}
bool CUdpSocket::JoinMultiCastGroup(LPCTSTR lpDstAddr, USHORT uDstPort)
{
/* Assign our destination address */
m_stDstAddr.sin_family = AF_INET;
m_stDstAddr.sin_addr.s_addr = inet_addr(lpDstAddr);
m_stDstAddr.sin_port = htons(uDstPort);
struct ip_mreq stMreq; /* Multicast interface structure */
/* Join the multicast group
*
* NOTE: According to RFC 1112, a sender does not need to join the
* group, however Microsoft requires a socket to join a group in
* order to use setsockopt() IP_MULTICAST_TTL (or fails with error
* WSAEINVAL).
*/
stMreq.imr_multiaddr.s_addr = inet_addr(lpDstAddr);
stMreq.imr_interface.s_addr = INADDR_ANY;
int nRet = setsockopt(m_socket,
IPPROTO_IP,
IP_ADD_MEMBERSHIP,
(char *)&stMreq,
sizeof(stMreq));
if (nRet == SOCKET_ERROR) {
printf (
"setsockopt() IP_ADD_MEMBERSHIP address %s failed, Err: %d\n",
lpDstAddr, WSAGetLastError());
return false ;
}
/* Set IP TTL to traverse up to multiple routers */
//*
u_long lTTL = 2 ;
nRet = setsockopt(m_socket,
IPPROTO_IP,
IP_MULTICAST_TTL,
(char *)<TL,
sizeof(lTTL));
if (nRet == SOCKET_ERROR) {
printf ("setsockopt() IP_MULTICAST_TTL failed, Err: %d\n",
WSAGetLastError());
}
//*/
return true ;
}
//
bool CUdpSocket::CreateCompleteIO()
{
m_hCompletionPort = CreateIoCompletionPort (INVALID_HANDLE_VALUE,NULL,0,1);
if (!m_hCompletionPort)
{
printf ("m_hCompletionPort Create Failed\n");
return false;
}
//Associate this socket to this I/O completion port
CreateIoCompletionPort ((HANDLE)m_socket,m_hCompletionPort,(DWORD)m_socket,1);
return true ;
}
接收数据的线程：
DWORD CReceiveSocket::DoWork()
{
DWORD nSocket;
BOOL b;
OVERLAPPED ovl;
LPOVERLAPPED lpo = &ovl;
DWORD dwTransfered = 0 ;
DWORD dwToTransfer = 0 ;
BYTE ReadBuffer[BUF_SIZE] ;
LPVOID lpMsgBuf;
DWORD dwBytes = AUDIO_PACKET_SIZE + sizeof(ST_FRAME);
for(;;)
{
b = GetQueuedCompletionStatus (m_hCompletionPort,&dwToTransfer,&nSocket,&lpo,INFINITE);
if(b || lpo)
{
OVERLAPPED ol;
ol.hEvent = m_hEvent;
ol.Offset = 0;
ol.OffsetHigh = 0;
memset(ReadBuffer,0,BUF_SIZE);
b = ReadFile ((HANDLE)nSocket,ReadBuffer,dwToTransfer,&dwTransfered,&ol);
if (!b )
{
DWORD dwErrCode = GetLastError();
if( dwErrCode != ERROR_IO_PENDING )
{
// something has gone wrong here...
printf("Something has gone wrong:Error code - %d\n",dwErrCode );
FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
dwErrCode ,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
(LPTSTR) &lpMsgBuf,
0,
NULL
);
OutputDebugString((LPCTSTR)lpMsgBuf);
// Free the buffer.
LocalFree( lpMsgBuf );
return -1 ;
}
else if( dwErrCode == ERROR_IO_PENDING && m_pIncomingDataHandler )
{
WaitForSingleObject(ol.hEvent,INFINITE);
m_pIncomingDataHandler(m_dwParam,ReadBuffer,dwBytes);
}
}
else if(m_pIncomingDataHandler)
{
m_pIncomingDataHandler(m_dwParam,ReadBuffer,dwBytes);
}
continue;
}
else
{
fprintf (stdout, "WorkThread Wait Failed\n");
return -1 ;
}
}
TRACE("RECV THREAD EXIT!\n");
return 0 ;
}
...全文
