暂时使用到的主要功能有四个：1.连接相机，2.实时显示，3.取图（bmp格式），4.关闭相机
在官网下载对应的win64的SDK，在库文件中运行demo.exe确保硬件连接正常。
在程序中导入库
1. 连接相机
使用到的主要SDK接口：NET_DVR_Init（初始化SDK),NET_DVR_Login(用户登录)
//连接相机，连接成功返回userID，返回-1为初始化SDK失败，返回-2为登录失败Q_INVOKABLE int camera_Connect(QString ip, int port = 8000, QString name = "admin", QString password = "*****");private:Ui::MainWidget *ui;int m_userID=-10;//记录连接是否成功，成功则返回正确IDbool m_Connect = false;LONG m_IRealPlayHandle=-100; //记录显示是否成功，成功则返回正确句柄
int MainWidget::camera_Connect(QString ip, int port, QString name, QString password){//QString 转 char * // ip name passwordchar* ch_ip;char* ch_name;char* ch_password;QByteArray ba_ip = ip.toLatin1();QByteArray ba_name = name.toLatin1();QByteArray ba_password = password.toLatin1();ch_ip = ba_ip.data();ch_name = ba_name.data();ch_password = ba_password.data();//初始化SDKbool isok = NET_DVR_Init();if (isok == false){qDebug() << "NET_DVR_Init error;error number is " << NET_DVR_GetLastError();return -1;}//设置连接时间与重连时间NET_DVR_SetConnectTime(2000, 1);NET_DVR_SetReconnect(10000, true);NET_DVR_DEVICEINFO DeviceInfoTmp; //设备信息long userID = NET_DVR_Login(ch_ip, port, ch_name, ch_password, &DeviceInfoTmp);//long userID = NET_DVR_Login("192.168.1.64", 8000, "admin", "a12345678", &DeviceInfoTmp);if (userID < 0){qDebug() << "NET_DVR_Login error;" << "error number is " << NET_DVR_GetLastError();return -2;}qDebug() << "Login userID:" << userID;m_Connect = true;m_userID = userID;return userID;}
2. 实时显示
需要调用实时显示之后，后续才能保存图片成功
使用到的主要的SDK接口：NET_DVR_RealPlay_V40
public://实时显示(需要先显示才能存图)Q_INVOKABLE bool camera_DisPlayCapture();private://实时显示在控件上（hWnd传入控件ID）long display_pic(long userID, HWND hWnd, NET_DVR_PREVIEWINFO struPlayInfo);
bool MainWidget::camera_DisPlayCapture(){if (m_userID >= 0){HWND hWnd = (HWND)ui->label->winId();//成功时，即可实时显示在该label上NET_DVR_PREVIEWINFO struPlayInfo = {0 }; //初始化//此为登录时返回的IDlong userID = m_userID;long IRealPlayHandle = display_pic(userID, hWnd, struPlayInfo);qDebug() << "camera_DisPlayCapture:IRealPlayHandle=" << IRealPlayHandle;m_IRealPlayHandle = IRealPlayHandle;return true;}else{qDebug() << ("HKCAMERA->camera_DisPlayCapture：m_userID < 0,not Connect");return false;}}long MainWidget::display_pic(long userID, HWND hWnd, NET_DVR_PREVIEWINFO struPlayInfo){struPlayInfo = {0 };struPlayInfo.hPlayWnd = hWnd;//需要 SDK 解码时句柄设为有效值，仅取流不解码时可设为空struPlayInfo.lChannel = 1;//预览通道号struPlayInfo.dwStreamType = 0;//码流类型：0-主码流，1-子码流，2-三码流，3-虚拟码流，以此类推struPlayInfo.dwLinkMode = 0;//0- TCP 方式，1- UDP 方式，2- 多播方式，3- RTP 方式，4-RTP/RTSP，5-RSTP/HTTPstruPlayInfo.bBlocked = 1;//0- 非阻塞取流，1- 阻塞取流long IRealPlayHandle = NET_DVR_RealPlay_V40(userID, &struPlayInfo, NULL, NULL);if (IRealPlayHandle < 0){qDebug() << "NET_DVR_RealPlay_V40 error;error number " << NET_DVR_GetLastError();NET_DVR_Logout(userID);return 0;}elsereturn IRealPlayHandle;}
3. 取图（bmp格式）
使用到的SDK接口：NET_DVR_CapturePicture
//保存图片：第二个参数是显示时返回的m_IRealPlayHandle（也可能是连接时返回的m_userID,测试时这两个值都可行）Q_INVOKABLE bool camera_SavePicture(QString filename, int IrealHandl);
bool MainWidget::camera_SavePicture(QString filename, int IrealHandl){if (!m_Connect)return false;if (m_IRealPlayHandle < 0)return false;QString capImagePath = filename;QDir m_capImagePath(capImagePath);if (m_capImagePath.exists())QFile::remove(capImagePath);char* ch_filename;QByteArray ba_filename = filename.toLatin1();ch_filename = ba_filename.data();bool pic_status = NET_DVR_CapturePicture(IrealHandl, ch_filename);if (pic_status){qDebug() << "camera_SavePicture save pic :" << filename << "success";}else{qDebug() << "camera_SavePicture save pic :" << filename << "false";}return pic_status;}
4. 关闭相机
使用到的SDK的接口：NET_DVR_Logout，NET_DVR_Cleanup
bool MainWidget::camera_Disconnect(){m_Connect = false;bool status1 = NET_DVR_Logout(m_userID);bool status2 = NET_DVR_Cleanup();return status1&& status2;}
借鉴博客：源博客链接，借鉴此博客完成连接和实时显示的功能。
