C#调用VC DLL 复杂结构 解决方法

VC的结构

 

struct HY_RECT_S

    {

        long lLeft;

        long lRight;

        long lTop;

        long lBottom;

    };

 

    struct ID_CARD_S

    {

     char szText[10][256];

     HY_RECT_S idRect[10];

    };

花了很久才解决 贴出来代码 跟遇到同样问题的朋友分享下

 

Code
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace Test
{
    public partial class Form1 : Form
    {
        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 1)]
        public struct HY_RECT_S
        {
            public long lLeft;
            public long lRight;
            public long lTop;
            public long lBottom;
        }
        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 1)]
        public struct ID_CARD_S
        {
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 2560)]
            public byte[] szText;
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 10)]
            public HY_RECT_S[] idRect;
        }

        [DllImport("D:\\DLL\\IDRCore.dll", EntryPoint = "Get_IdcData", CharSet = CharSet.Ansi)]
        public extern static int Get_IdcData(
                        int iCardType,
                        string szFileNameIn,
                        String szFullFileNameOut,
                        String szHeadFileNameOut,
                        ref ID_CARD_S pstOut);
        [DllImport("D:\\DLL\\IDRCore.dll", EntryPoint = "Device_Open", CharSet = CharSet.Ansi)]
        public static extern int Device_Open();

        [DllImport("D:\\DLL\\IDRCore.dll", EntryPoint = "Get_IdcPic", CharSet = CharSet.Ansi)]
        unsafe public static extern int Get_IdcPic(int iCardType, String szFileNameIn);

        public Form1()
        {
            InitializeComponent();
        }
        private void button4_Click(object sender, EventArgs e)
        {
            ID_CARD_S idCardS = new ID_CARD_S();
            StringBuilder szFullFileNameOut = new StringBuilder(1024);
            StringBuilder szHeadFileNameOut = new StringBuilder(1024);
            unsafe
            {

                //fixed (ID_CARD_S * pids = &idCardS)
                //{
                    //IntPtr ipIds = (IntPtr)pids;
                int i0=Device_Open();

                int i1 = Get_IdcPic(2, "C:\\1.bmp");

                int i2 = Get_IdcData(2, "C:\\1.bmp", "C:\\2.bmp", "C:\\3.bmp", ref idCardS);
                byte[] result = new byte[256];
                String[] strResult = new String[10]; 
                int k = 0;
                for (int i = 0; i < 10; i++)
                {
                    for (int j = 0; j < 256; j++)
                    {
                        result[j] = idCardS.szText[k++];

                    }
                    strResult[i] = FromASCIIByteArray(result);
                }

                    string s = FromASCIIByteArray(idCardS.szText);
                    MessageBox.Show(s);

                //}
            }


        }

        public static String FromASCIIByteArray(byte[] characters)
        {
            Encoding myEncoding = Encoding.GetEncoding("gb2312");
            string sData = myEncoding.GetString(characters);
            string constructedString = sData.Trim().TrimEnd('\0');
            return (constructedString);
        } 
    }
}