基于 Agora SDK 实现 Windows 端的多人视频互动

// 创建实例。m_lpRtcEngine = createAgoraRtcEngine();RtcEngineContext ctx;
// 添加注册回调和事件。ctx.eventHandler = &m_engineEventHandler;
// 输入你的 App ID。ctx.appId = "YourAppID";
// 初始化 IRtcEngine。m_lpRtcEngine->initialize(ctx);
// 继承 IRtcEngineEventHandler 类中的回调与事件。class CAGEngineEventHandler :    public IRtcEngineEventHandler{public:    CAGEngineEventHandler();    ~CAGEngineEventHandler();    void setMainWnd(HWND wnd);    HWND GetMsgReceiver() {return m_hMainWnd;};
    // 在主播调用 joinChannel 方法后，此回调会报告加入频道的主播信息。    virtual void onJoinChannelSuccess(const char* channel, uid_t uid, int elapsed);
    // 在主播调用 leaveChannel 方法后，此回调会报告离开频道的主播信息。    virtual void onLeaveChannel(const RtcStats& stat);

    // 在引擎收到第一帧远端视频流并解码成功时，会触发此回调。    virtual void onFirstRemoteVideoDecoded(uid_t uid, int width, int height, int elapsed);

    // 在主播调用 leaveChannel 方法后，此回调会报告该主播离开频道及离线原因。    virtual void onUserOffline(uid_t uid, USER_OFFLINE_REASON_TYPE reason);private:    HWND m_hMainWnd;};

// 设置频道模式为直播。m_lpRtcEngine->setChannelProfile(CHANNEL_PROFILE_LIVE_BROADCASTING);

BOOL CAgoraObject::SetClientRole(CLIENT_ROLE_TYPE role, LPCSTR lpPermissionKey){    // 设置用户角色。    int nRet = m_lpAgoraEngine->setClientRole(role);    m_nRoleType = role;    return nRet == 0 ? TRUE : FALSE;}// 创建选择用户角色的对话框。void CEnterChannelDlg::OnCbnSelchangeCmbRole(){    int nSel = m_ctrRole.GetCurSel();    if (nSel == 0)        CAgoraObject::GetAgoraObject()->SetClientRole(CLIENT_ROLE_BROADCASTER);    else        CAgoraObject::GetAgoraObject()->SetClientRole(CLIENT_ROLE_AUDIENCE);}

// 启用视频模块。m_lpRtcEngine->enableVideo();
// 设置本地视图。VideoCanvas vc;vc.uid = 0;vc.view = hVideoWnd;vc.renderMode = RENDER_MODE_TYPE::RENDER_MODE_HIDDEN;m_lpRtcEngine->setupLocalVideo(vc);

// 在频道中开启 Web SDK 与 Native SDK 互通。m_lpRtcEngine->enableWebSdkInteroperability(true);

// 加入频道。BOOL CAgoraObject::JoinChannel(LPCTSTR lpChannelName, UINT nUID, LPCSTR lpDynamicKey){    int nRet = 0;    LPCSTR lpStreamInfo = "{\"owner\":true,\"width\":640,\"height\":480,\"bitrate\":500}";#ifdef UNICODE    CHAR szChannelName[128];    ::WideCharToMultiByte(CP_ACP, 0, lpChannelName, -1, szChannelName, 128, NULL, NULL);    nRet = m_lpAgoraEngine->joinChannel(lpDynamicKey, szChannelName, lpStreamInfo, nUID);#else    nRet = m_lpAgoraEngine->joinChannel(lpDynamicKey, lpChannelName, lpStreamInfo, nUID);#endif    if (nRet == 0)        m_strChannelName = lpChannelName;    return nRet == 0 ? TRUE : FALSE;}

// 在引擎收到第一帧远端视频流并解码成功时，会触发此回调。void CAGEngineEventHandler::onFirstRemoteVideoDecoded(uid_t uid, int width, int height, int elapsed){    LPAGE_FIRST_REMOTE_VIDEO_DECODED lpData = new AGE_FIRST_REMOTE_VIDEO_DECODED;    lpData->uid = uid;    lpData->width = width;    lpData->height = height;    lpData->elapsed = elapsed;    if(m_hMainWnd != NULL)        ::PostMessage(m_hMainWnd, WM_MSGID(EID_FIRST_REMOTE_VIDEO_DECODED), (WPARAM)lpData, 0);}VideoCanvas canvas;canvas.renderMode = RENDER_MODE_FIT;POSITION pos = m_listWndInfo.GetHeadPosition();......AGVIDEO_WNDINFO &agvWndInfo = m_listWndInfo.GetNext(pos);canvas.uid = agvWndInfo.nUID;canvas.view = m_wndVideo[nIndex].GetSafeHwnd();agvWndInfo.nIndex = nIndex;
// 设置远端视图。CAgoraObject::GetEngine()->setupRemoteVideo(canvas);

BOOL CAgoraObject::LeaveCahnnel(){    m_lpAgoraEngine->stopPreview();
    // 离开频道。    int nRet = m_lpAgoraEngine->leaveChannel();    m_nSelfUID = 0;    return nRet == 0 ? TRUE : FALSE;}

void CAgoraObject::CloseAgoraObject(){    if(m_lpAgoraEngine != NULL)        // 释放 IRtcEngine 对象。        m_lpAgoraEngine->release();    if(m_lpAgoraObject != NULL)        delete m_lpAgoraObject;    m_lpAgoraEngine = NULL;    m_lpAgoraObject = NULL;}