public async Task <OResult <Boolean> > BackupByTimeAsync(DateTime from, DateTime to, CancellationToken cancellationToken = default)
{
try
{
var lpDiskList = new CHCNetSDK.NET_DVR_DISKABILITY_LIST();
lpDiskList.dwSize = (UInt32)Marshal.SizeOf(lpDiskList);
var succ = CHCNetSDK.NET_DVR_GetDiskList(_userId, ref lpDiskList);
if (!succ)
{
return(new OResult <Boolean>(false, HkvsErrorCode.GetLastErrorCode(), $"获取磁盘列表失败：{HkvsErrorCode.GetLastErrorMessage()}"));
}
if (!lpDiskList.struDescNode.Any())
{
return(new OResult <Boolean>(false, "可用磁盘列表为空"));
}
var availableDesc = lpDiskList.struDescNode.Where(x => x.dwFreeSpace > 0).Select(x => x.byDescribe).FirstOrDefault();
if (availableDesc == null || !availableDesc.Any())
{
return(new OResult <Boolean>(false, "磁盘空间不足"));
}
var lpBackupByTime = new CHCNetSDK.NET_DVR_BACKUP_TIME_PARAM();
lpBackupByTime.lChannel = _loginRequest.ChannelNo;
lpBackupByTime.struStartTime.dwYear = (UInt32)from.Year;
lpBackupByTime.struStartTime.dwMonth = (UInt32)from.Month;
lpBackupByTime.struStartTime.dwDay = (UInt32)from.Day;
lpBackupByTime.struStartTime.dwHour = (UInt32)from.Hour;
lpBackupByTime.struStartTime.dwMinute = (UInt32)from.Minute;
lpBackupByTime.struStartTime.dwSecond = (UInt32)from.Second;
lpBackupByTime.struStopTime.dwYear = (UInt32)to.Year;
lpBackupByTime.struStopTime.dwMonth = (UInt32)to.Month;
lpBackupByTime.struStopTime.dwDay = (UInt32)to.Day;
lpBackupByTime.struStopTime.dwHour = (UInt32)to.Hour;
lpBackupByTime.struStopTime.dwMinute = (UInt32)to.Minute;
lpBackupByTime.struStopTime.dwSecond = (UInt32)to.Second;
lpBackupByTime.byDiskDes = availableDesc; //备份磁盘的描述
lpBackupByTime.byWithPlayer = 0; //是否备份播放器，0-不备份，1-备份
lpBackupByTime.byContinue = 0; //是否继续备份，0-不继续，1-继续
lpBackupByTime.byDrawFrame = 0; //0-不抽帧，1-抽帧
var backUpHandle = CHCNetSDK.NET_DVR_BackupByTime(_userId, ref lpBackupByTime);
if (backUpHandle < 0)
{
return(new OResult <Boolean>(false, $"按时间备份录像失败：{HkvsErrorCode.GetLastErrorMessage()}"));
}
var tcs = new TaskCompletionSource <Boolean>();
_ = Task.Run(async() =>
{
UInt32 iPos = 0;
IntPtr pState = Marshal.AllocHGlobal((Int32)iPos);
Marshal.StructureToPtr(iPos, pState, false);
try
{
while (!cancellationToken.IsCancellationRequested)
{
var succ = CHCNetSDK.NET_DVR_GetBackupProgress(backUpHandle, pState);
if (succ)
{
iPos = (UInt32)Marshal.PtrToStructure(pState, typeof(UInt32));
if (iPos == 100)
{
CHCNetSDK.NET_DVR_StopBackup(backUpHandle);
tcs.SetResult(true);
return;
}
else if (iPos == 101 || iPos >= 400)
{
CHCNetSDK.NET_DVR_StopBackup(backUpHandle);
return;
}
}
await Task.Delay(1000);
}
}
finally
{
Marshal.FreeHGlobal(pState);
}
}, CancellationToken.None);
succ = await tcs.Task;
if (!succ)
{
return(new OResult <Boolean>(false, "按时间下载失败"));
}
return(new OResult <Boolean>(true));
}
catch (Exception ex)
{
return(new OResult <Boolean>(false, ex));
}
}