视频监控系统采用云模式进行规划、建设和部署，实现了资源的共享、数据的融通、算力的提升；而开放的生态和业务的智能，让视频监控系统更好地为公安实战服务，让城市更安全。TSINGSEE青犀视频团队研发的EasyCVR就是比较完善的视频监控上云平台，能够实现不同协议摄像头的统一接入，实现实时监控摄像头视频流调阅。

近期我们的研发团队在EasyCVR集成海康EHome私有协议的研发，前篇博文讲了Ehome协议调用流程介绍，大概讲了Ehome协议的接入流程。本文讲一下Ehome协议下文件查找操作流程。

Ehome协议下文件查找操作流程

接入海康Ehome私有协议后，也可通过中心管理服务（CMS）搜索保存在设备存储中的视频或音频文件，可用于回放。操作文件查找前，务必进行NET_ECMS_Init初始化CMS，NET_ECMS_StartListen开启CMS监听服务以接收设备注册信息。

文件查找的接口调用流程图

操作的基本步骤

1、调用NET_ECMS_StartFindFile_V11开始查找文件
2、调用NET_ECMS_FindNextFile_V11逐个枚举搜索到的文件
3、调用NET_ECMS_StopFindFile停止查找文件
4、调用NET_ECMS_ForceLogout注销设备

#include <stdio.h>
#include <Windows.h>
#include "HCISUPCMS.h"
#include "HCISUPStream.h"
#include "plaympeg4.h"

LONG lLoginID = -1;
LONG lLinkHandle = -1;
LONG lPlayHandle = -1;
FILE *Videofile = NULL;

//初始化CMS
NET_ECMS_Init();

//注册的监听参数
NET_EHOME_CMS_LISTEN_PARAM struCMSListenPara = {0};
memcpy(struCMSListenPara.struAddress.szIP, "0.0.0.0", sizeof("0.0.0.0"));
struCMSListenPara.struAddress.wPort = 7660;
struCMSListenPara.fnCB = RegisterCallBack;

//开启监听服务并接收设备注册信息
LONG lListen = NET_ECMS_StartListen(&struCMSListenPara);
if(lListen < -1)
{
    printf("NET_ECMS_StartListen failed, error code: %d\n", NET_ECMS_GetLastError());
    NET_ECMS_Fini();
    return;
}
printf("NET_ECMS_StartListen!\n");

while(1)
{
    Sleep(1000);  //以下操作需在注册完整后才能进行
    if(lLoginID >= 0)
    {
        break;
    }
}

//查找视频文件
NET_EHOME_REC_FILE_COND struFindCond = {0};
struFindCond.dwChannel =1;  //通道号，从1开始
struFindCond.dwRecType = 0xff; //所有类型
struFindCond.dwStartIndex = 0;  //搜索起始位置
struFindCond.dwMaxFileCountPer = 5;  //单次可搜索的最多文件数量

//搜索开始时间
struFindCond.struStartTime.wYear = (WORD)2015;
struFindCond.struStartTime.byMonth = (BYTE)5;
struFindCond.struStartTime.byDay = (BYTE)18;
struFindCond.struStartTime.byHour = (BYTE)10; 
struFindCond.struStartTime.byMinute = (BYTE)0;
struFindCond.struStartTime.bySecond = (BYTE)0;

//搜索结束时间
struFindCond.struStopTime.wYear = (WORD)2015;
struFindCond.struStopTime.byMonth = (BYTE)5;
struFindCond.struStopTime.byDay = (BYTE)18;
struFindCond.struStopTime.byHour = (BYTE)12;
struFindCond.struStopTime.byMinute = (BYTE)59;
struFindCond.struStopTime.bySecond = (BYTE)59;

LONG lSearchType = 0; //查找视频文件
LONG lFileHandle = NET_ECMS_StartFindFile_V11(lLoginID, lSearchType, &struFindCond, sizeof(struFindCond)); //开始文件查找
if (lFileHandle < 0)
{		 
    printf("NET_ECMS_StartFindFile_V11 failed, error code: %d\n", NET_ECMS_GetLastError());
    NET_ECMS_Fini();
    return;
} 
printf("NET_ECMS_StartFindFile_V11!\n");

LONG lRet = -1;
char csTmp[256] = {0};	
char szFileName[MAX_FILE_NAME_LEN] = {0};

NET_EHOME_REC_FILE struFileInfo = {0};

//可在线程中查找文件
while(1)
{
    lRet = NET_ECMS_FindNextFile_V11(lFileHandle, &struFileInfo, sizeof(struFileInfo));//逐个获取搜索结果
    if (lRet == ENUM_GET_NEXT_STATUS_SUCCESS)
    {
        if (struFileInfo.dwFileSize / 1024 == 0)
        {
            sprintf(csTmp,"%d",struFileInfo.dwFileSize);
        }
        else if (struFileInfo.dwFileSize / 1024 > 0 && struFileInfo.dwFileSize /(1024*1024) == 0)
        {
            sprintf(csTmp,"%dK",struFileInfo.dwFileSize/1024);
        }
        else
        {
            sprintf(csTmp,"%dM",struFileInfo.dwFileSize /1024/1024);
        }

        printf("Filename[%s], Filesize[%s], StarTime[%04d-%02d-%02d %02d:%02d:%02d], StopTime[%04d-%02d-%02d %02d:%02d:%02d] \n", \
           struFileInfo.szFileName, csTmp, struFileInfo.struStartTime.wYear, struFileInfo.struStartTime.byMonth, \
           struFileInfo.struStartTime.byDay, struFileInfo.struStartTime.byHour, struFileInfo.struStartTime.byMinute,\
           struFileInfo.struStartTime.bySecond, struFileInfo.struStopTime.byDay, struFileInfo.struStopTime.byHour, \
           struFileInfo.struStopTime.byMinute, struFileInfo.struStopTime.bySecond);//搜索到的文件信息

        memcpy(szFileName, struFileInfo.sFileName, MAX_FILE_NAME_LEN);
    }
    else
    {
        if (lRet == ENUM_GET_NETX_STATUS_NEED_WAIT)
        {
            Sleep(5);
            continue;
        }

        if ((lRet == ENUM_GET_NETX_STATUS_NO_FILE) || (lRet == ENUM_GET_NEXT_STATUS_FINISH))
        {
            printf("No more file!\n");
            break;
        }
        else if(lRet == ENUM_GET_NEXT_STATUS_NOT_SUPPORT)
        {
            printf("Device does not support!\n");
            break;
        }
        else
        {
            printf("Failed to find a file, for the server is busy or network failure!\n");
            break;
        }
    }
}
//CMS停止监听服务
if(!NET_ECMS_StopListen(lListen))
{
    printf("NET_ECMS_StopListen failed, error code: %d\n", NET_ECMS_GetLastError());
}

//释放被CMS占用的资源
NET_ECMS_Fini();