using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace WIDESEAWCS_Common.Face
{
    // 相机取帧及帧图象显示组件
    public class CHS_Capture
    {
        // 返回相机个数
        [DllImport("SmCameraPreview.dll", EntryPoint = "SmCameraGetCount", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall)]
        public static extern int SmCameraGetCount();

        // 打开相机（根据相机索引号 nDeviceId）
        [DllImport("SmCameraPreview.dll", EntryPoint = "SmCameraOpen", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall)]
        public static extern IntPtr SmCameraOpen(int nDeviceId, int nWidth, int nHeight);

        // 打开相机（根据相机VID+PIC）
        [DllImport("SmCameraPreview.dll", EntryPoint = "SmCameraOpenEx", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall)]
        public static extern IntPtr SmCameraOpenEx(int nVid, int nPid, int nWidth, int nHeight);

        // 从打开的相机提取一帧视频数据
        [DllImport("SmCameraPreview.dll", EntryPoint = "SmCameraGetFrame", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall)]
        public static extern int SmCameraGetFrame(IntPtr hCamera, IntPtr pFrameBuf, int bMirror, int bFlip);

        // 关闭相机
        [DllImport("SmCameraPreview.dll", EntryPoint = "SmCameraClose", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall)]
        public static extern void SmCameraClose(IntPtr hCamera);

        // 创建视频帧显示对象（nWidth * nHeight 为视频帧的分辨率，hWnd 为显示窗口句柄）
        [DllImport("SmCameraPreview.dll", EntryPoint = "SmCameraPreviewCreate", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall)]
        public static extern IntPtr SmCameraPreviewCreate(int nWidth, int nHeight, IntPtr hWND);

        // 显示视频帧
        [DllImport("SmCameraPreview.dll", EntryPoint = "SmCameraPreview", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall)]
        public static extern void SmCameraPreview(IntPtr hCameraPreview, IntPtr pFrame);

        // 显示视频帧及人脸框（weight为边框的厚度）
        [DllImport("SmCameraPreview.dll", EntryPoint = "SmCameraPreviewFace", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall)]
        public static extern void SmCameraPreviewFace(IntPtr hCameraPreview, IntPtr pFrame, int left, int top, int right, int bottom, int weight, int color);

        // 释放视频帧显示对象
        [DllImport("SmCameraPreview.dll", EntryPoint = "SmCameraPreviewDestroy", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall)]
        public static extern void SmCameraPreviewDestroy(IntPtr hCameraPreivew);
    }
}