文章目录
- 前言
- 一、下载并集成大华网络相机SDK
- 二、示例实现功能
- 三、示例完整代码
- 四、下载链接
- 总结
前言
近期在Qt环境下进行大华网络相机的使用，发现官网下载的SDK中提供的示例没有Qt的demo，通过学习其提供的MFC示例代码，我在这里也实现了一个比较简单的Qt下调用大华网络相机的示例程序，并将相关代码展现出来以便大家学习，如有错误之处，欢迎大家批评指正。
项目效果
提示：以下是本篇文章正文内容，下面案例可供参考
一、下载并集成大华网络相机SDK
到大华官网进行下载：大华设备网络SDK，也可以通过文末我的百度网盘链接下载本示例使用到的SDK（建议直接官网进行下载，有详细的示例文档及函数接口说明）
在官网下根据项目需求选择对应的SDK，下面是本示例使用到的：
在集成该SDK时，我是把需要用到的h和lib文件打包在一个文件夹内，然后放在项目pro文件的同级目录下，然后在pro文件中添加下列代码：（也可以直接在Qt中通过添加库的方式进行集成）
#SDK
INCLUDEPATH += $$PWD/SDK/Includes
DEPENDPATH += $$PWD/SDK/Includes
LIBS += -L$$PWD/SDK/Lib/ -ldhnetsdk
SDK文件夹内容如图（dll文件夹中存放程序运行时需要的dll，运行时需要放在exe同级目录下）
二、示例实现功能
在我的示例项目代码中有详细的注释，这里就不对各功能一一介绍了：
1.绑定窗口句柄实时显示相机数据：
//开始
void Widget::on_pb_start_clicked()
{if(0 != m_lRealPlayHandle){CLIENT_StopRealPlay(m_lRealPlayHandle);m_lRealPlayHandle = 0;ui->pb_start->setText("开始");}else{int nChannel = 0;HWND hWnd = reinterpret_cast<HWND>(ui->lb_show->winId());m_lRealPlayHandle = CLIENT_StartRealPlay(m_lLoginHandle, nChannel, hWnd, DH_RType_Realplay, NULL, NULL, NULL);if (0 == m_lRealPlayHandle){QMessageBox::information(this,"提示","开始失败!");return;}ui->pb_start->setText("停止");CLIENT_RenderPrivateData(m_lRealPlayHandle, TRUE);}
}
2.开启智能事件订阅，绑定事件回调：
//订阅
void Widget::on_pb_event_clicked()
{if (0 != m_lRealLoadHandle){CLIENT_StopLoadPic(m_lRealLoadHandle);m_lRealLoadHandle = 0;ui->pb_event->setText("订阅");}else{int nChannel = 0;m_lRealLoadHandle = CLIENT_RealLoadPictureEx(m_lLoginHandle, nChannel, EVENT_IVS_ALL, TRUE, EventCallback, (LDWORD)this, NULL);if (m_lRealLoadHandle == 0){QMessageBox::information(this,"提示","订阅失败!");return;}ui->pb_event->setText("停止订阅");}
}//事件回调
int CALLBACK Widget::EventCallback(LLONG lAnalyzerHandle, DWORD dwAlarmType, void* pAlarmInfo, BYTE *pBuffer, DWORD dwBufSize, LDWORD dwUser, int nSequence, void *reserved)
{if(0 == dwUser){return -1;}//绊线入侵事件if(dwAlarmType == EVENT_IVS_CROSSLINEDETECTION) //EVENT_IVS_HUMANTRAIT{//检查是否有有效的图像数据if (pBuffer == NULL || dwBufSize == 0){LOGDEBUG<<"事件回调图像数据无效";return -1;}//保存图像QPointer<Widget> camera = reinterpret_cast<Widget*>(dwUser);QMetaObject::invokeMethod(camera, [=](){//这里SaveImage中有直接操作ui控件,所以需要使用QMetaObject::invokeMethodcamera->SaveImage(pBuffer,dwBufSize);});}return 0;
}
3.主动抓图，触发抓图回调并保存图像：
//抓图
void Widget::on_pb_get_clicked()
{if (0 != m_lLoginHandle){//主动抓图SNAP_PARAMS snapparams = {0};snapparams.Channel = 0;snapparams.mode = 0;snapparams.CmdSerial = 0;BOOL flag = CLIENT_SnapPicture(m_lLoginHandle, snapparams);if (!flag){QMessageBox::information(this,"提示","抓图失败!");}else{ui->pte_text->appendPlainText("开始抓图");}}
}//抓图回调
void CALLBACK Widget::CaptureCallback(LLONG ILoginID, BYTE *pBuf, UINT RevLen, UINT EncodeType, DWORD CmdSerial, LDWORD dwUser)
{//跨线程调用,相机回调函数是有另开子线程的QPointer<Widget> camera = reinterpret_cast<Widget*>(dwUser);QMetaObject::invokeMethod(camera, [=](){//多个相机就需要//if(ILoginID == camera->m_lLoginHandle){camera->OnOnePicture(ILoginID,pBuf,RevLen,EncodeType,CmdSerial);}});
}//抓图
void Widget::OnOnePicture(LLONG ILoginID, BYTE *pBuf, UINT RevLen, UINT EncodeType, UINT CmdSerial)
{//检查输入合法性if(!pBuf || RevLen == 0){LOGDEBUG<<"抓图图像数据无效";return;}//保存图像SaveImage(pBuf,RevLen);
}//保存图像
bool Widget::SaveImage(BYTE *pBuffer, DWORD dwBufSize)
{//定义输出文件名static int num = 0;num++;char outputFileName[256];snprintf(outputFileName, sizeof(outputFileName), "output_image_%d.jpg", num);//打开文件以写入二进制数据FILE* file = fopen(outputFileName, "wb");if (file == NULL){LOGDEBUG<<"图像保存失败!";return false;}//写入图像数据到文件fwrite(pBuffer, 1, dwBufSize, file);//关闭文件fclose(file);LOGDEBUG<<"图像保存成功!";ui->pte_text->appendPlainText("图像保存成功!");return true;
}
4.鼠标事件过滤，进行云台控制
//事件过滤器
bool Widget::eventFilter(QObject *watched, QEvent *event)
{if(watched ==ui->lb_show){QMouseEvent *mouseEvent = static_cast<QMouseEvent*>(event);if (event->type() == QEvent::MouseButtonPress){//鼠标按下,记录起点m_startPos = mouseEvent->pos();m_currentPos = m_startPos;m_drawing = true;return true;}else if (event->type() == QEvent::MouseMove && m_drawing){//鼠标移动,更新终点并绘制临时矩形m_currentPos = mouseEvent->pos();return true;}else if (event->type() == QEvent::MouseButtonRelease && m_drawing){//鼠标释放,绘制最终矩形m_drawing = false;m_currentPos = mouseEvent->pos();//坐标转换QRect winRect = ui->lb_show->rect();double xScale = winRect.width() / 2560.0;double yScale = winRect.height() / 1440.0;m_startPos = QPoint(m_startPos.x()/xScale,m_startPos.y()/yScale);m_currentPos = QPoint(m_currentPos.x()/xScale,m_currentPos.y()/yScale);UpDateShow(m_startPos,m_currentPos);return true;}}return QWidget::eventFilter(watched,event);
}
5.相机断线与重连回调：
//设备断连回调
void CALLBACK Widget::DisConnect(LLONG lLoginID, char *pchDVRIP, LONG nDVRPort, LDWORD dwUser)
{if(0 != dwUser){QPointer<Widget> camera = reinterpret_cast<Widget*>(dwUser);camera->SetConnect(0);}
}//设备重连回调
void CALLBACK Widget::ReConnect(LLONG lLoginID, char *pchDVRIP, LONG nDVRPort, LDWORD dwUser)
{if(0 != dwUser){QPointer<Widget> camera = reinterpret_cast<Widget*>(dwUser);camera->SetConnect(1);}
}
、、、、、、
三、示例完整代码
1.DahuaDemo.pro
QT += core guigreaterThan(QT_MAJOR_VERSION, 4): QT += widgetsCONFIG += c++11DEFINES += QT_DEPRECATED_WARNINGSSOURCES += \main.cpp \widget.cppHEADERS += \widget.h \FORMS += \widget.uiqnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target#SDK
INCLUDEPATH += $$PWD/SDK/Includes
DEPENDPATH += $$PWD/SDK/Includes
LIBS += -L$$PWD/SDK/Lib/ -ldhnetsdk
2.widget.h
#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>
#include <QObject>
#include <QMessageBox>
#include <QPen>
#include <QPainter>
#include <QMouseEvent>
#include <QLabel>
#include <QRect>
#include <QTime>
#include <QTimer>
#include <QPointer>
#include <QDebug>#include "dhnetsdk.h"#define LOGDEBUG qDebug()<<QTime::currentTime().toString("[hh:mm:ss:zzz]")using namespace std;struct HUMAN_TRAIT_EVENT_INFO
{DEV_EVENT_HUMANTRAIT_INFO stuEvent;BYTE* pBuf;int nBufSize;
};QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACEclass Widget : public QWidget
{Q_OBJECTpublic:Widget(QWidget *parent = nullptr);~Widget();void InitWidget();void InitNetSDK();void SetConnect(int type);bool SaveImage(BYTE *pBuffer, DWORD dwBufSize);void UpDateShow(const QPoint &start, const QPoint &end);void PtzExtControl(DWORD dwCommand, DWORD dwParam = 0);void OnOnePicture(LLONG ILoginID, BYTE *pBuf, UINT RevLen, UINT EncodeType, UINT CmdSerial);protected:bool eventFilter(QObject *watched, QEvent *event);private:static void CALLBACK DisConnect(LLONG lLoginID, char *pchDVRIP, LONG nDVRPort, LDWORD dwUser);static void CALLBACK ReConnect(LLONG lLoginID, char *pchDVRIP, LONG nDVRPort, LDWORD dwUser);static void CALLBACK CaptureCallback(LLONG ILoginID, BYTE *pBuf, UINT RevLen, UINT EncodeType, DWORD CmdSerial, LDWORD dwUser);static int CALLBACK EventCallback(LLONG lAnalyzerHandle, DWORD dwAlarmType, void* pAlarmInfo, BYTE *pBuffer, DWORD dwBufSize, LDWORD dwUser, int nSequence, void *reserved);private slots:void on_pb_login_clicked();void on_pb_start_clicked();void on_pb_event_clicked();void on_pb_get_clicked();private:Ui::Widget *ui;LLONG m_lLoginHandle; //登录句柄LLONG m_lRealPlayHandle; //播放句柄LLONG m_lRealLoadHandle; //订阅句柄int m_posX; //水平坐标int m_posY; //垂直坐标int m_posZoom; //变倍bool m_drawing; //绘制标志QPoint m_startPos; //鼠标起点QPoint m_currentPos; //鼠标当前点};
#endif // WIDGET_H
3.widget.cpp
#include "widget.h"
#include "ui_widget.h"#pragma execution_character_set("utf-8")//LLONG m_lHandle;Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{ui->setupUi(this);InitWidget();
}Widget::~Widget()
{delete ui;if(0 != m_lLoginHandle){on_pb_login_clicked();}CLIENT_Cleanup();
}//初始化界面
void Widget::InitWidget()
{m_lLoginHandle = 0;m_lRealPlayHandle = 0;m_lRealLoadHandle = 0;ui->le_ip->setText("192.168.1.108");ui->le_port->setText("37777");ui->le_user->setText("admin");ui->le_password->setText("12345678");ui->lb_show->installEventFilter(this);//初始化相机InitNetSDK();}//初始化相机
void Widget::InitNetSDK()
{//初始化BOOL ret = CLIENT_Init(DisConnect, (LDWORD)this);if (ret){LOG_SET_PRINT_INFO stLogPrintInfo = {sizeof(stLogPrintInfo)};CLIENT_LogOpen(&stLogPrintInfo);//初始化成功后设置网络参数//目前仅单独设置获取设备信息时间（部分设备因性能问题，没法在默认时间内完成，其他参数暂时保持默认）NET_PARAM stuNetParam = {0};stuNetParam.nGetDevInfoTime = 3000;stuNetParam.nPicBufSize = 10*1024*1024;CLIENT_SetNetworkParam(&stuNetParam);//设置回调CLIENT_SetSnapRevCallBack(CaptureCallback,(LDWORD)this);CLIENT_SetAutoReconnect(ReConnect, (LDWORD)this);}else{QMessageBox::information(this,"提示","初始化SDK失败!");}
}//设置连接
void Widget::SetConnect(int type)
{if(type == 0){LOGDEBUG<<"相机断连";}else{LOGDEBUG<<"相机重连";}
}//保存图像
bool Widget::SaveImage(BYTE *pBuffer, DWORD dwBufSize)
{//定义输出文件名static int num = 0;num++;char outputFileName[256];snprintf(outputFileName, sizeof(outputFileName), "output_image_%d.jpg", num);//打开文件以写入二进制数据FILE* file = fopen(outputFileName, "wb");if (file == NULL){LOGDEBUG<<"图像保存失败!";return false;}//写入图像数据到文件fwrite(pBuffer, 1, dwBufSize, file);//关闭文件fclose(file);LOGDEBUG<<"图像保存成功!";ui->pte_text->appendPlainText("图像保存成功!");return true;
}//更新界面显示
void Widget::UpDateShow(const QPoint &start, const QPoint &end)
{QRect winRect = ui->lb_show->rect(); //窗口矩形区域//LOGDEBUG<<"start:"<<start<<" end:"<<end;double xScale = winRect.width() / 2560.0;double yScale = winRect.height() / 1440.0;QPoint pointStart = QPoint(start.x()*xScale,start.y()*yScale); //起始点QPoint pointEnd = QPoint(end.x()*xScale,end.y()*yScale); //结束点//LOGDEBUG<<"pointStart:"<<pointStart<<" pointEnd:"<<pointEnd;QPoint origin;QPoint sendPoint;//计算窗口中心点（Qt的坐标系以左上角为原点）origin.setX( (winRect.left() + winRect.right()) / 2 );origin.setY( (winRect.top() + winRect.bottom()) / 2 );//计算两点中点坐标int dx = (pointStart.x() + pointEnd.x()) / 2;int dy = (pointStart.y() + pointEnd.y()) / 2;//获取窗口尺寸（Qt推荐使用width()/height()方法）int width = winRect.width();int height = winRect.height();//坐标映射：将中点坐标转换为标准化的设备坐标//注意：Qt的Y轴方向向下，根据具体需求可能需要符号处理sendPoint.setX( (dx - origin.x()) * 8192 * 2 / width );sendPoint.setY( (dy - origin.y()) * 8192 * 2 / height ); // 反转Y轴方向//计算拖动区域尺寸（允许负值）int width2 = pointEnd.x() - pointStart.x();int height2 = pointEnd.y() - pointStart.y();int multiple = 0;//计算面积比例（带方向）if (height2 != 0 && width2 != 0){if (pointEnd.y() >= pointStart.y()){multiple = (width * height) / (width2 * height2);}else{multiple = -(width * height) / (width2 * height2);}}m_posX = sendPoint.x();m_posY = sendPoint.y();m_posZoom = multiple;//qDebug()<<"m_posX:"<<m_posX<<" m_posY:"<<m_posY<<" m_posZoom:"<<m_posZoom;PtzExtControl(DH_EXTPTZ_FASTGOTO);
}//云台控制
void Widget::PtzExtControl(DWORD dwCommand, DWORD dwParam)
{if (0 == m_lLoginHandle){return;}long param1=0,param2=0,param3 = 0;char param4[256]={0};char *pchPresetName = NULL;switch(dwCommand) {case DH_PTZ_POINT_MOVE_CONTROL://Go to presetparam1=0;param2=1;param3=0;break;case DH_PTZ_POINT_SET_CONTROL://Add presetparam1=0;param2=1;param3=0;break;case DH_EXTPTZ_FASTGOTO: //快速定位case DH_EXTPTZ_EXACTGOTO://3D intelligent positionparam1=m_posX;param2=m_posY;param3=m_posZoom;break;case DH_EXTPTZ_RESETZERO:param1=0;param2=0;param3=0;break;default:break;}BOOL bRet=CLIENT_DHPTZControlEx2(m_lLoginHandle,0,dwCommand,param1,param2,param3,FALSE,(void*)param4);if(bRet){LOGDEBUG<<"移动成功!";}else{LOGDEBUG<<"移动失败!";}
}//抓图
void Widget::OnOnePicture(LLONG ILoginID, BYTE *pBuf, UINT RevLen, UINT EncodeType, UINT CmdSerial)
{//检查输入合法性if(!pBuf || RevLen == 0){LOGDEBUG<<"抓图图像数据无效";return;}//保存图像SaveImage(pBuf,RevLen);
}//事件过滤器
bool Widget::eventFilter(QObject *watched, QEvent *event)
{if(watched ==ui->lb_show){QMouseEvent *mouseEvent = static_cast<QMouseEvent*>(event);if (event->type() == QEvent::MouseButtonPress){//鼠标按下,记录起点m_startPos = mouseEvent->pos();m_currentPos = m_startPos;m_drawing = true;return true;}else if (event->type() == QEvent::MouseMove && m_drawing){//鼠标移动,更新终点并绘制临时矩形m_currentPos = mouseEvent->pos();return true;}else if (event->type() == QEvent::MouseButtonRelease && m_drawing){//鼠标释放,绘制最终矩形m_drawing = false;m_currentPos = mouseEvent->pos();//坐标转换QRect winRect = ui->lb_show->rect();double xScale = winRect.width() / 2560.0;double yScale = winRect.height() / 1440.0;m_startPos = QPoint(m_startPos.x()/xScale,m_startPos.y()/yScale);m_currentPos = QPoint(m_currentPos.x()/xScale,m_currentPos.y()/yScale);UpDateShow(m_startPos,m_currentPos);return true;}}return QWidget::eventFilter(watched,event);
}//设备断连回调
void CALLBACK Widget::DisConnect(LLONG lLoginID, char *pchDVRIP, LONG nDVRPort, LDWORD dwUser)
{if(0 != dwUser){QPointer<Widget> camera = reinterpret_cast<Widget*>(dwUser);camera->SetConnect(0);}
}//设备重连回调
void CALLBACK Widget::ReConnect(LLONG lLoginID, char *pchDVRIP, LONG nDVRPort, LDWORD dwUser)
{if(0 != dwUser){QPointer<Widget> camera = reinterpret_cast<Widget*>(dwUser);camera->SetConnect(1);}
}//抓图回调
void CALLBACK Widget::CaptureCallback(LLONG ILoginID, BYTE *pBuf, UINT RevLen, UINT EncodeType, DWORD CmdSerial, LDWORD dwUser)
{//跨线程调用,相机回调函数是有另开子线程的QPointer<Widget> camera = reinterpret_cast<Widget*>(dwUser);QMetaObject::invokeMethod(camera, [=](){//多个相机就需要//if(ILoginID == camera->m_lLoginHandle){camera->OnOnePicture(ILoginID,pBuf,RevLen,EncodeType,CmdSerial);}});
}//事件回调
int CALLBACK Widget::EventCallback(LLONG lAnalyzerHandle, DWORD dwAlarmType, void* pAlarmInfo, BYTE *pBuffer, DWORD dwBufSize, LDWORD dwUser, int nSequence, void *reserved)
{if(0 == dwUser){return -1;}//绊线入侵事件if(dwAlarmType == EVENT_IVS_CROSSLINEDETECTION) //EVENT_IVS_HUMANTRAIT{//检查是否有有效的图像数据if (pBuffer == NULL || dwBufSize == 0){LOGDEBUG<<"事件回调图像数据无效";return -1;}//保存图像QPointer<Widget> camera = reinterpret_cast<Widget*>(dwUser);QMetaObject::invokeMethod(camera, [=](){//这里SaveImage中有直接操作ui控件,所以需要使用QMetaObject::invokeMethodcamera->SaveImage(pBuffer,dwBufSize);});}return 0;
}//登录
void Widget::on_pb_login_clicked()
{if (0 != m_lLoginHandle ){if (0 != m_lRealPlayHandle){on_pb_start_clicked();}if (0 != m_lRealLoadHandle){}CLIENT_Logout(m_lLoginHandle);m_lLoginHandle = 0;ui->pb_login->setText("登录");}else{NET_IN_LOGIN_WITH_HIGHLEVEL_SECURITY stInparam;memset(&stInparam, 0, sizeof(stInparam));stInparam.dwSize = sizeof(stInparam);strncpy(stInparam.szIP, ui->le_ip->text().toLocal8Bit(), sizeof(stInparam.szIP) - 1);strncpy(stInparam.szPassword, ui->le_password->text().toLocal8Bit(), sizeof(stInparam.szPassword) - 1);strncpy(stInparam.szUserName, ui->le_user->text().toLocal8Bit(), sizeof(stInparam.szUserName) - 1);stInparam.nPort = ui->le_port->text().toInt();stInparam.emSpecCap = EM_LOGIN_SPEC_CAP_TCP;NET_OUT_LOGIN_WITH_HIGHLEVEL_SECURITY stOutparam;memset(&stOutparam, 0, sizeof(stOutparam));stOutparam.dwSize = sizeof(stOutparam);m_lLoginHandle = CLIENT_LoginWithHighLevelSecurity(&stInparam, &stOutparam);if (0 != m_lLoginHandle){ui->pb_login->setText("登出");}else{QMessageBox::information(this,"提示","登录失败!");m_lLoginHandle = 0;}}
}//开始
void Widget::on_pb_start_clicked()
{if(0 != m_lRealPlayHandle){CLIENT_StopRealPlay(m_lRealPlayHandle);m_lRealPlayHandle = 0;ui->pb_start->setText("开始");}else{int nChannel = 0;HWND hWnd = reinterpret_cast<HWND>(ui->lb_show->winId());m_lRealPlayHandle = CLIENT_StartRealPlay(m_lLoginHandle, nChannel, hWnd, DH_RType_Realplay, NULL, NULL, NULL);if (0 == m_lRealPlayHandle){QMessageBox::information(this,"提示","开始失败!");return;}ui->pb_start->setText("停止");CLIENT_RenderPrivateData(m_lRealPlayHandle, TRUE);}
}//订阅
void Widget::on_pb_event_clicked()
{if (0 != m_lRealLoadHandle){CLIENT_StopLoadPic(m_lRealLoadHandle);m_lRealLoadHandle = 0;ui->pb_event->setText("订阅");}else{int nChannel = 0;m_lRealLoadHandle = CLIENT_RealLoadPictureEx(m_lLoginHandle, nChannel, EVENT_IVS_ALL, TRUE, EventCallback, (LDWORD)this, NULL);if (m_lRealLoadHandle == 0){QMessageBox::information(this,"提示","订阅失败!");return;}ui->pb_event->setText("停止订阅");}
}//抓图
void Widget::on_pb_get_clicked()
{if (0 != m_lLoginHandle){//主动抓图SNAP_PARAMS snapparams = {0};snapparams.Channel = 0;snapparams.mode = 0;snapparams.CmdSerial = 0;BOOL flag = CLIENT_SnapPicture(m_lLoginHandle, snapparams);if (!flag){QMessageBox::information(this,"提示","抓图失败!");}else{ui->pte_text->appendPlainText("开始抓图");}}
}
4.widget.ui
四、下载链接
我这里将使用到的SDK打包在百度网盘，链接：https://pan.baidu.com/s/1RvS1qxdlkw6leKyGMGrOzQ?pwd=xxcj
提取码： xxcj
总结
这个示例实现了Qt下调用大华网络相机SDK进行实时显示，相较于大华提供的demo也是精简了部分功能，详细的可以运行官网提供的demo进行学习。在本文中有写到对智能事件的订阅回调，这个是需要通过浏览器对网络相机进行配置的，可以查看使用说明书来进行配置哦。
hello：
共同学习，共同进步，如果还有相关问题，可在评论区留言进行讨论。
参考博客：使用QT对接大华网络摄像头SDK的示例程序（建议收藏）
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