C#如何设置海康相机的触发延迟参数

海康相机的触发延迟参数可以通过 SDK 中提供的 HCNetSDK.dll 和 PlayCtrl.dll 来实现。具体步骤如下：

1. 引入相应的命名空间：

using System.Runtime.InteropServices;
using System.Threading;

2. 调用 HCNetSDK.dll 和 PlayCtrl.dll 中的初始化方法：

[DllImport("HCNetSDK.dll")]
public static extern bool NET_DVR_Init();

[DllImport("PlayCtrl.dll")]
public static extern bool PlayM4_Init();

3. 登录相机并设置触发模式和延迟时间：

[DllImport("HCNetSDK.dll")]
public static extern int NET_DVR_Login_V30(string sDVRIP, int wDVRPort, string sUserName, string sPassword, ref NET_DVR_DEVICEINFO_V30 lpDeviceInfo);

[DllImport("HCNetSDK.dll")]
public static extern bool NET_DVR_SetDVRConfig(int lUserID, uint dwCommand, int lChannel, IntPtr lpInBuffer, uint dwInBufferSize);

public struct NET_DVR_TIME_EX
{
    public ushort wYear;
    public ushort wMonth;
    public ushort wDay;
    public ushort wHour;
    public ushort wMinute;
    public ushort wSecond;
    public ushort wMilliSec;
    public ushort wReserved;
}

[DllImport("HCNetSDK.dll")]
public static extern bool NET_DVR_SetupAlarmChan_V30(int lUserID, ref NET_DVR_SETUPALARM_PARAM lpSetupParam);

NET_DVR_DEVICEINFO_V30 deviceInfo = new NET_DVR_DEVICEINFO_V30();
int userID = NET_DVR_Login_V30("192.168.1.64", 8000, "admin", "12345", ref deviceInfo);
if (userID < 0)
{
    Console.WriteLine("登录失败！");
    return;
}

NET_DVR_SETUPALARM_PARAM alarmParam = new NET_DVR_SETUPALARM_PARAM
{
    dwSize = (uint)Marshal.SizeOf(typeof(NET_DVR_SETUPALARM_PARAM))
};
int handle = NET_DVR_SetupAlarmChan_V30(userID, ref alarmParam);

IntPtr delay = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(uint)));
Marshal.WriteInt32(delay, 1000); // 设置触发延迟为 1 秒

NET_DVR_TIME_EX struTime = new NET_DVR_TIME_EX
{
    wYear = (ushort)DateTime.Now.Year,
    wMonth = (ushort)DateTime.Now.Month,
    wDay = (ushort)DateTime.Now.Day,
    wHour = (ushort)DateTime.Now.Hour,
    wMinute = (ushort)DateTime.Now.Minute,
    wSecond = (ushort)DateTime.Now.Second,
    wMilliSec = (ushort)DateTime.Now.Millisecond,
    wReserved = 0
};

NET_DVR_STD_CONFIG config = new NET_DVR_STD_CONFIG
{
    dwSize = (uint)Marshal.SizeOf(typeof(NET_DVR_STD_CONFIG)),
    lpInBuffer = delay,
    dwInBufferSize = (uint)Marshal.SizeOf(typeof(uint)),
    lpStatusBuffer = IntPtr.Zero,
    dwStatusSize = 0,
    lpOutBuffer = IntPtr.Zero,
    dwOutBufferSize = 0
};
NET_DVR_SetDVRConfig(userID, (uint)NET_DVR_GET_TIMECFG, 0, ref config, (uint)Marshal.SizeOf(typeof(NET_DVR_STD_CONFIG)));

NET_DVR_STD_CONFIG triggerConfig = new NET_DVR_STD_CONFIG
{
    dwSize = (uint)Marshal.SizeOf(typeof(NET_DVR_STD_CONFIG)),
    lpInBuffer = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(NET_DVR_TIME_EX))),
    dwInBufferSize = (uint)Marshal.SizeOf(typeof(NET_DVR_TIME_EX)),
    lpStatusBuffer = IntPtr.Zero,
    dwStatusSize = 0,
    lpOutBuffer = IntPtr.Zero,
    dwOutBufferSize = 0
};
Marshal.StructureToPtr(struTime, triggerConfig.lpInBuffer, false);
NET_DVR_SetDVRConfig(userID, (uint)NET_DVR_SET_TIMECFG, 0, ref triggerConfig, (uint)Marshal.SizeOf(typeof(NET_DVR_STD_CONFIG)));

NET_DVR_STD_CONTROL triggerControl = new NET_DVR_STD_CONTROL
{
    dwSize = (uint)Marshal.SizeOf(typeof(NET_DVR_STD_CONTROL)),
    lpInBuffer = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(uint))),
    dwInBufferSize = (uint)Marshal.SizeOf(typeof(uint)),
    lpOutBuffer = IntPtr.Zero,
    dwOutBufferSize = 0
};
Marshal.StructureToPtr(1u, triggerControl.lpInBuffer, false);
NET_DVR_SetDVRConfig(userID, (uint)NET_DVR_SET_TRIGGER_DELAY, 0, ref triggerControl, (uint)Marshal.SizeOf(typeof(NET_DVR_STD_CONTROL)));

在上述代码中，通过调用 HCNetSDK.dll 和 PlayCtrl.dll 中的方法来实现登录相机、设置触发模式和延迟时间的操作。其中，`NET_DVR_SetDVRConfig` 方法用于设置触发延迟参数，`NET_DVR_SetupAlarmChan_V30` 方法用于设置报警通道，`NET_DVR_SetDVRConfig` 方法用于设置当前时间，`NET_DVR_SetDVRConfig` 方法用于设置触发延迟时间。