视频聊天软件_C/C++_编程开发_程序员俱乐部

视频聊天软件是通过实时获取视频头重的图像数据，并将图像转换成可进行网络传输的二进制数据发送到另一端聊天软件上，当对方接收到传过来的图片数据后，再将其转换成图片信息并绘制在视频输出窗口。当聊天的双方都是想了这一功能后即可进行交互式的视频聊天。

主要的视频函数：

?(1)#capCreateCaptureWindow函数：用于创建一个视频捕捉窗口,返回值是视频捕捉窗口句柄。语法如下:

????? HWND VFWAPI capCreateWindow(LPCSTR lpszWindowName,DWORD dwStyle,int y,int nWidth,int nHeight,HWND hWnd,int nID);

?(2)capDriverConnect宏:主要将视频捕捉窗口连接的视频驱动程序上。语法如下:

????? BOOL capDriverConnect(hwnd,iIndex);

?(3)capPreviewRate宏:在预览模式下设置帧的显速率。语法如下:

??????BOOL capPreviewRate(hwnd,wMS);

?(4)capPreview宏:用于激活或禁止预览模式。在预览模式下，视频设备捕捉的数据以帧的形式传递到系统内存中，然后通过GDI函数显示在视频捕捉窗口中。语法如下:

????? BOOL capPreview(hwnd,f)

系统实现过程:

?(1)新建一个基于对话框的工程，简历服务器端应用程序。

?(2)在对话框中添加编辑框插件，用于发送文本信息，添加RichEdit控件，用于显示发送和接收的文本信息。

?(3)在窗体初始化时创建CSocket类并初始化视频头，将通过视频头获取的图像显示在窗体中，代码如下：

BOOL CServerDlg::OnInitDialog()
{
?CDialog::OnInitDialog();

?// Add "About..." menu item to system menu.

?// IDM_ABOUTBOX must be in the system command range.
?ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
?ASSERT(IDM_ABOUTBOX < 0xF000);

?CMenu* pSysMenu = GetSystemMenu(FALSE);
?if (pSysMenu != NULL)
?{
??CString strAboutMenu;
??strAboutMenu.LoadString(IDS_ABOUTBOX);
??if (!strAboutMenu.IsEmpty())
??{
???pSysMenu->AppendMenu(MF_SEPARATOR);
???pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
??}
?}

?// Set the icon for this dialog.? The framework does this automatically
?//? when the application's main window is not a dialog
?SetIcon(m_hIcon, TRUE);???// Set big icon
?SetIcon(m_hIcon, FALSE);??// Set small icon
?
?m_ServerSock.SetDlg(this);
?m_ClientSock.SetDlg(this);
?// TODO: Add extra initialization here
?
?m_ServerSock.Create(845);
?m_ServerSock.Listen();

?

?m_hWndVideo = capCreateCaptureWindow(NULL,WS_POPUP, 1, 1, 10, 10, m_hWnd, 0);
?if (capDriverConnect(m_hWndVideo, 0))
?{
??::SetParent(m_hWndVideo,*this);
??::SetWindowLong(m_hWndVideo,GWL_STYLE,WS_CHILD);

??CRect wndRC;
??m_Panel.GetClientRect(wndRC);
??m_Panel.MapWindowPoints(this,wndRC);
??wndRC.DeflateRect(1,1,1,1);

??::SetWindowPos(m_hWndVideo,NULL,wndRC.left,wndRC.top,wndRC.Width(),wndRC.Height(),SWP_NOZORDER);
??::ShowWindow(m_hWndVideo,SW_SHOW);

??CAPDRIVERCAPS caps;
??capDriverGetCaps(m_hWndVideo,sizeof(caps),&caps);

??if (caps.fHasOverlay)
???capOverlay(m_hWndVideo,TRUE);

??CAPTUREPARMS params;
??capCaptureGetSetup(m_hWndVideo,&params,sizeof(params));

??params.fYield?????????? = TRUE;
??params.fAbortLeftMouse? = FALSE;
??params.fAbortRightMouse = FALSE;
??params.fLimitEnabled??? = FALSE;
??params.vKeyAbort??????? = FALSE;
??params.fCaptureAudio??? = FALSE;
??
??capCaptureSetSetup(m_hWndVideo,&params, sizeof(params));
??capSetCallbackOnVideoStream(m_hWndVideo, EncodeCallback);

??capPreviewRate(m_hWndVideo,30);
??capPreview(m_hWndVideo, TRUE);
??capCaptureSequenceNoFile(m_hWndVideo);
?
??m_bSendImage = FALSE;
?}
?SetTimer(1, 200, NULL);
?return TRUE;? // return TRUE? unless you set the focus to a control
}

?(4)实现EncodeCallback函数，该函数是视频捕捉时使用的回调函数。该函数的实现用于获取视频捕捉窗口的图像数据并存储到Cpackage类中所对应的数据缓冲区中，代码如下:

LRESULT WINAPI EncodeCallback(HWND hWnd, LPVIDEOHDR lpVHdr)
{
?if (lpVHdr->dwFlags&VHDR_DONE)
?{
??static BOOL bSend = TRUE;
??CServerDlg* pDlg = (CServerDlg*)AfxGetMainWnd();
??int nState = pDlg->m_Video.GetCheck();
??if (nState == 1)
??{
???if (pDlg->m_bSendImage==FALSE)
???{
????//获取图象数据
????BITMAPINFO bmpInfo;
????capGetVideoFormat(pDlg->m_hWndVideo, &bmpInfo, sizeof(BITMAPINFO));
????//确定图象数据大小
????int nSize = bmpInfo.bmiHeader.biSizeImage;
????bSend = FALSE;
????HGLOBAL hGlobal = GlobalAlloc(GHND, nSize + sizeof(BITMAPINFOHEADER));
????BYTE* pData = (BYTE*)GlobalLock(hGlobal);
????memcpy(pData, &bmpInfo.bmiHeader, sizeof(BITMAPINFOHEADER));

????BYTE* pTmp = pData;
????pTmp += sizeof(BITMAPINFOHEADER);
????memcpy(pTmp, lpVHdr->lpData, nSize);

????int nPackSize = sizeof(CPackage) + nSize + sizeof(BITMAPINFOHEADER);
????
????if (pDlg->m_hGlobal != NULL)
????{
?????GlobalFree(pDlg->m_hGlobal);
?????pDlg->m_hGlobal = NULL;
????}

????pDlg->m_hGlobal = GlobalAlloc(GHND, nPackSize);

????BYTE* pSendData = (BYTE*)GlobalLock(pDlg->m_hGlobal);
????CPackage* pPackage = (CPackage*)pSendData;
????pPackage->m_Type = ptImage;
????pPackage->m_dwContent = nSize + sizeof(BITMAPINFOHEADER);
????pPackage->m_dwData = nSize + sizeof(BITMAPINFOHEADER);
????pPackage->m_dwSize = sizeof(CPackage);
????pTmp = pSendData;
????pTmp += sizeof(CPackage);
????memcpy(pTmp, pData, nSize + sizeof(BITMAPINFOHEADER));

????GlobalUnlock(hGlobal);
????GlobalFree(hGlobal);
????GlobalUnlock(pDlg->m_hGlobal);
???
????pDlg->m_bSendImage = TRUE;
???}
??}
?}
??return 1;
}

?(5)在窗体上单机“发送”按钮会将文本信息发送的客服端，代码如下:

void CServerDlg::OnSend()
{
?CString szSendInfo;
?m_SendInfo.GetWindowText(szSendInfo);
?if (!szSendInfo.IsEmpty())
?{
??//填充数据包
??int nLen = szSendInfo.GetLength();
??HGLOBAL hGlobal = GlobalAlloc(GHND, sizeof(CPackage) + nLen);
??BYTE* pData = (BYTE*)GlobalLock(hGlobal);
??CPackage *pPackage = (CPackage*) pData;
??pPackage->m_Type = ptText;
??pPackage->m_dwContent = nLen;
??pPackage->m_dwSize = sizeof(CPackage);
??pPackage->m_dwData = nLen;
??BYTE* pTmp = pData;
??pTmp += sizeof(CPackage);
??memcpy(pTmp, szSendInfo, nLen);
??m_ClientSock.Send(pData, sizeof(CPackage) + nLen);
??GlobalUnlock(hGlobal);
??GlobalFree(hGlobal);
??m_SendInfo.SetWindowText("");
??m_InfoList.SetSel(-1, 0);
??m_InfoList.ReplaceSel("服务器say: \n");
??m_InfoList.SetSel(-1, 0);
??m_InfoList.ReplaceSel(szSendInfo);
??m_InfoList.SetSel(-1, 0);
??m_InfoList.ReplaceSel("\n");

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