Java调用海康威视接口并抓取Jpeg图片到内存

        因为工作需要，需要调用海康威视摄像头接口抓取Jpeg图片并保存到内存中，查找相关资料并整合，加上自己对官方提供的SDK文档，相关调用代码如下：

public class TestHikvision {

    public static void main(String[] args) throws IOException {
        TestHikvision app = new TestHikvision();
        
        MonitorCameraInfo cameraInfo = new MonitorCameraInfo();//需要新建MonitorCameraInfo类
        cameraInfo.setCameraIp("****");
        cameraInfo.setCameraPort(8000);
        cameraInfo.setUserName("admin");
        cameraInfo.setUserPwd("****");
        
        app.getDVRConfig(cameraInfo);
        app.getDVRPic(cameraInfo);
        //app.Test_CaptureJpegPicture_new(cameraInfo);
    }

    public void getDVRConfig(MonitorCameraInfo cameraInfo) {
        HCNetSDK sdk = HCNetSDK.INSTANCE;
        //判断摄像头是否开启
        if (!sdk.NET_DVR_Init()) {
            System.out.println("SDK初始化失败");
            return;
        }
        //设置连接时间与重连
        //sdk.NET_DVR_SetConnectTime(2000, 1);  
        //sdk.NET_DVR_SetReconnect(10000, true);

        NET_DVR_DEVICEINFO_V30 devinfo = new NET_DVR_DEVICEINFO_V30();// 设备信息
        
        //System.out.println("设备信息："+devinfo);
        
        //登录信息
        NativeLong id = sdk.NET_DVR_Login_V30(cameraInfo.getCameraIp(), (short) cameraInfo.getCameraPort(),
                cameraInfo.getUserName(), cameraInfo.getUserPwd(), devinfo);

        cameraInfo.setUserId(id);// 返回一个用户编号，同时将设备信息写入devinfo
        //输出int数据
        //System.out.println("intValue:"+cameraInfo.getUserId().intValue());
        if (cameraInfo.getUserId().intValue() < 0) {
            System.out.println("设备注册失败");
            return;
        }
        //DVR工作状态
        NET_DVR_WORKSTATE_V30 devwork = new NET_DVR_WORKSTATE_V30();
        if (!sdk.NET_DVR_GetDVRWorkState_V30(cameraInfo.getUserId(), devwork)) {
            // 返回Boolean值，判断是否获取设备能力
            System.out.println("返回设备状态失败");
        }

        IntByReference ibrBytesReturned = new IntByReference(0);// 获取IP接入配置参数
        NET_DVR_IPPARACFG ipcfg = new NET_DVR_IPPARACFG();//IP接入配置结构
        ipcfg.write();
        Pointer lpIpParaConfig = ipcfg.getPointer();
        //获取相关参数配置
        sdk.NET_DVR_GetDVRConfig(cameraInfo.getUserId(), HCNetSDK.NET_DVR_GET_IPPARACFG, new NativeLong(0),
                lpIpParaConfig, ipcfg.size(), ibrBytesReturned);
        ipcfg.read();
        System.out.print("IP地址:" + cameraInfo.getCameraIp());
        System.out.println("|设备状态：" + devwork.dwDeviceStatic);// 0正常，1CPU占用率过高，2硬件错误，3未知
        //System.out.println("ChanNum"+devinfo.byChanNum);
        // 显示模拟通道
        for (int i = 0; i < devinfo.byChanNum; i++) {
            System.out.print("Camera" + i + 1);// 模拟通道号名称
            System.out.print("|是否录像:" + devwork.struChanStatic[i].byRecordStatic);// 0不录像，不录像
            System.out.print("|信号状态:" + devwork.struChanStatic[i].bySignalStatic);// 0正常，1信号丢失
            System.out.println("|硬件状态:" + devwork.struChanStatic[i].byHardwareStatic);// 0正常，1异常
        }
        //注销用户
        sdk.NET_DVR_Logout(cameraInfo.getUserId());//释放SDK资源
        sdk.NET_DVR_Cleanup();
    }

    //抓拍图片
    public void getDVRPic(MonitorCameraInfo cameraInfo) throws IOException {
    	
    	//设置通道号，其中1正常，-1不正常
        NativeLong chanLong = new NativeLong(1);
        cameraInfo.setChannel(chanLong);
        //System.out.println("Channel:"+chanLong);
        long startTime = System.currentTimeMillis();
        HCNetSDK sdk = HCNetSDK.INSTANCE;
        if (!sdk.NET_DVR_Init()) {
            System.out.println("SDK初始化失败");
            return;
        }

        NET_DVR_DEVICEINFO_V30 devinfo = new NET_DVR_DEVICEINFO_V30();// 设备信息
        
        //注册设备
        NativeLong id = sdk.NET_DVR_Login_V30(cameraInfo.getCameraIp(), (short) cameraInfo.getCameraPort(),
                cameraInfo.getUserName(), cameraInfo.getUserPwd(), devinfo);
        cameraInfo.setUserId(id);// 返回一个用户编号，同时将设备信息写入devinfo
        if (cameraInfo.getUserId().intValue() < 0) {
            System.out.println("设备注册失败"+sdk.NET_DVR_GetLastError());
            return;
        } else {
            System.out.println("id：" + cameraInfo.getUserId().intValue());
        }
        NET_DVR_WORKSTATE_V30 devwork = new NET_DVR_WORKSTATE_V30();
        if (!sdk.NET_DVR_GetDVRWorkState_V30(cameraInfo.getUserId(), devwork)) {
            // 返回Boolean值，判断是否获取设备能力
            System.out.println("返回设备状态失败");
        }

        //System.out.println("设备注册耗时：[" + (System.currentTimeMillis() - startTime) + "]");

        startTime = System.currentTimeMillis();
        //图片质量
        NET_DVR_JPEGPARA jpeg = new NET_DVR_JPEGPARA();
        // 设置图片的分辨率
        jpeg.wPicSize = 2;
        // 设置图片质量
        jpeg.wPicQuality = 2;

        IntByReference a = new IntByReference();
        //设置图片大小
        ByteBuffer jpegBuffer = ByteBuffer.allocate(1024 * 1024);
        // 创建文件目录，文件？？？？？
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
        Date date = new Date();
        String fileNameString = "D:/CapturePicture/"+sdf.format(date)+".jpg";
        //还需要设置抓拍图片格式
/*      String pathString = cameraInfo.getFilePath();*/
        File file = new File(fileNameString);
/*        if (!file.exists()) {  
        	file.mkdirs(); //创建目录
        }*/
        //file.mkdirs();


        // 抓图到内存，单帧数据捕获并保存成JPEG存放在指定的内存空间中
        //需要加入通道
        boolean is = sdk.NET_DVR_CaptureJPEGPicture_NEW(cameraInfo.getUserId(), cameraInfo.getChannel(), jpeg,
                jpegBuffer, 1024 * 1024, a);
        //System.out.println("Channel:"+cameraInfo.getChannel());
        System.out.println("抓图到内存耗时：[" + (System.currentTimeMillis() - startTime) + "ms]");

        // 抓图到文件
        //boolean is = sdk.NET_DVR_CaptureJPEGPicture(cameraInfo.UserId,cameraInfo.Channel,jpeg, fileNameString);
        if (is) {
            System.out.println("抓取成功,返回长度：" + a.getValue());
        } else {
            System.out.println("抓取失败："+sdk.NET_DVR_GetLastError());
        }

        //startTime = System.currentTimeMillis();
        // 存储本地，写入内容
        BufferedOutputStream outputStream = null;
        try {
            outputStream = new BufferedOutputStream(new FileOutputStream(file));
            outputStream.write(jpegBuffer.array(), 0, a.getValue());
            outputStream.flush();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (outputStream != null) {
                try {
                    outputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

        //System.out.println("存储本地耗时：[" + (System.currentTimeMillis() - startTime) + "]");

        sdk.NET_DVR_Logout(cameraInfo.getUserId());
        sdk.NET_DVR_Cleanup();
    }
}

代码参考了http://blog.csdn.net/redfoxtao/article/details/78080861

不同的地方在Net_DVR_CaptureJPEGPicture中调用的channel（通道号）直接设置值为1，已经去掉了file.mkdirs()。

大致就是这样，有问题的可以留言。