using System;
using System.Runtime.InteropServices;
using TDMS.Common;

namespace TDMS.Externals
{
    internal partial class DDC : DIAdemConnectivity
    {
        /// <summary>
        /// 获取指定文件中的通道组数量。
        /// </summary>
        /// <param name="file">文件</param>
        /// <param name="numChannelGroups">指定文件中通道组的数量</param>
        [DllImport(DLL, CallingConvention = CallingConvention.StdCall, EntryPoint = "DDC_GetNumChannelGroups")]
        public static extern Error CountChannelGroups(IntPtr file, out uint numChannelGroups);

        /// <summary>
        /// 获取指定文件中的通道组。
        /// </summary>
        /// <param name="file">文件</param>
        /// <param name="channelGroupsBuffer">通道组的数组缓冲区</param>
        /// <param name="numberOfChannelGroups">通道组数量</param>
        /// <returns>是否成功。除非另有说明，否则零表示执行成功，负数表示错误代码。</returns>
        [DllImport(DLL, CallingConvention = CallingConvention.StdCall, EntryPoint = "DDC_GetChannelGroups")]
        public static extern Error GetChannelGroups(IntPtr file, IntPtr[] channelGroupsBuffer, uint numberOfChannelGroups);

        [DllImport(DLL, CallingConvention = CallingConvention.StdCall, EntryPoint = "DDC_GetNumChannels")]
        public static extern Error CountChannels(IntPtr channelGroup, out uint numChannels);

        [DllImport(DLL, CallingConvention = CallingConvention.StdCall, EntryPoint = "DDC_GetChannels")]
        public static extern Error GetChannels(IntPtr channelGroup, IntPtr[] channelsBuf, uint numChannels);
    }
}