IPServer的实现3-机顶盒。
分析:要组播接收的方式接收交换机的数据。图像要显示出来(由于发送时设定了发送包的大小所以还要组包)。
接收数据和显示代码如下:
UINT ReceiveShowCh1(void *p) { CMultSocket m_SocketCh; CCh1Dlg *pDlg=(CCh1Dlg*)p; CString m_strIP; CString m_strPort; pDlg->m_IPAddrCh1.GetWindowText(m_strIP); pDlg->m_PortCh1.GetWindowText(m_strPort); pDlg->m_Port1=atoi(m_strPort); CString strTemp; unsigned int IP_A; strTemp=m_strIP.Mid(0, m_strIP.Find('.',0)); IP_A=atoi(strTemp); if(IP_A<224 || IP_A>239 || pDlg->m_Port1>65536) { AfxMessageBox("地址范围:224.0.0.0~239.255.255.254,端口号范围:0~65535"); return -1; } /*设置组播接收*/ int ret; SOCKET SockCh1; SOCKADDR_IN localAddr,remoteAddr; int len = sizeof SOCKADDR; char recvBuf[32000]; ip_mreq mcast; // 设置组播 SockCh1 = socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP); if ( INVALID_SOCKET == SockCh1 ) { WSACleanup(); return 1; } localAddr.sin_family = AF_INET; localAddr.sin_port = htons(pDlg->m_Port1); localAddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY); ret = bind(SockCh1,(SOCKADDR*)&localAddr,len); if ( SOCKET_ERROR == ret ) { closesocket(SockCh1); return -1; } //用于接收组播所设置,把套接字加入一个组播 memset(&mcast,0x00,sizeof(mcast)); mcast.imr_multiaddr.S_un.S_addr = inet_addr(m_strIP); mcast.imr_interface.S_un.S_addr = htonl(INADDR_ANY); ret = setsockopt(SockCh1,IPPROTO_IP,IP_ADD_MEMBERSHIP,(char*)&mcast,sizeof(mcast)); if ( SOCKET_ERROR == ret ) { AfxMessageBox("Error IP_Add");//printf("IP_ADD_MEMBERSHIP ERROR! CODE IS : %d\n",WSAGetLastError()); return -1; } memset(&remoteAddr,0x00,len); memset(recvBuf,0x00,sizeof(recvBuf)); char *pBuf=new char[320000]; int iTemp=0; int flags=0; while (1) { ret = recvfrom(SockCh1,recvBuf,sizeof(recvBuf),0,(SOCKADDR*)&remoteAddr,&len); if(flags) { if ( ret > 0 ) { if(ret==1024) { for (int i=0; i<=ret; i++) { pBuf[i+iTemp] = recvBuf[i]; } iTemp+=ret; } else { for (int i=0; i<=ret; i++) { pBuf[i+iTemp] = recvBuf[i]; } iTemp+=ret; //显示接收内容 pDlg->ShowPIC(pBuf,iTemp); iTemp=0; } } } //过滤掉不完整的第一帧,一旦第一个小于1024的包, //认为为图片的最后一个包,下一个为图片开始,flags置位 if(ret<1024) { flags=1; } } return 0; }
其中ShowPIC的代码如下:
void CCh1Dlg::ShowPIC(char* buf,int iSize) { IStream* m_pStream ; IPicture* m_pPicture ; LONG m_nWidth; LONG m_nHeight; HRESULT hr;
//上下文环境
CWnd *pPic =GetDlgItem(IDC_STATIC_Picture1); pPic-> GetDC(); CClientDC dc(pPic);//CClientDC dc(this); CRect rc; HWND pWnd = pPic->GetSafeHwnd(); ::GetWindowRect(pWnd,&rc); m_pStream = NULL; m_pPicture = NULL; HGLOBAL hMem = ::GlobalAlloc(GMEM_MOVEABLE,iSize);//开辟内存 hMem=buf; hr = ::CreateStreamOnHGlobal(hMem,TRUE,&m_pStream); ASSERT(SUCCEEDED(hr)); hr= ::OleLoadPicture(m_pStream,iSize,TRUE,IID_IPicture,(LPVOID *)&m_pPicture); ASSERT(hr==S_OK); //long nWidth,nHeight;宽高,MM_HIMETRIC 模式,单位是0.01毫米 m_pPicture->get_Width(&m_nWidth);//宽 m_pPicture->get_Height(&m_nHeight);//高 int w=rc.right-rc.left; int h=rc.bottom-rc.top;
//根据窗口大小来显示 double tmppx=w*26.46; double tmppy=h*26.46; LONG px=(LONG)tmppx; LONG py=(LONG)tmppy; CSize sz(px,py);//图片显示的大小 dc.HIMETRICtoDP(&sz); // 转换 MM_HIMETRIC 模式单位为 MM_TEXT 像素单位 m_pPicture->Render(dc.m_hDC,0,0,sz.cx,sz.cy,0,m_nHeight,m_nWidth,-m_nHeight,NULL); }
到此结束了。这里只是贴了些部分实现的代码。自认写的不好很多可以改进的地方。贴出了就是想得到更多的改进。
PS:不管结果如何吧。过程那些只有我们能体会,还有,那个和我一起努力的兄弟,我们加油,我们要变的更强!~