NLPIR漢語分詞系統(又名ICTCLAS2013),主要功能包括中文分詞；詞性標註；命名實體識別；使用者詞典功能；支援GBK編碼、UTF8編碼、BIG5編碼。新增微博分詞、新詞發現與關鍵詞提取；張華平博士先後傾力打造十餘年，核心升級10次。詳見http://ictclas.nlpir.org/
下載了dll檔案進行除錯，發現了好多問題，拿出來分享一下
按照官方的開發文件http://ictclas.nlpir.org/newsDetail?DocId=368寫了一個類
執行的時候提示無法找到函式入口，去網上搜了一下，用這樣的辦法解決了
下載一個exescope工具，開啟NLPIR.dll，在匯出裡面可以看到NLPIR的各種函式，發現好多亂碼，如下圖

於是我把這些亂碼都複製過去，居然可以用了，但是提示原因可能是託管的 PInvoke 簽名與非託管的目標籤名不匹配。在dllimport裡面新增這樣一個屬性就可以了CallingConvention = CallingConvention.Cdecl。CallingConvention指定呼叫在非託管程式碼中實現的方法所需的呼叫約定，其中cdecl呼叫方清理堆疊。這使您能夠呼叫具有varargs 的函式（如 Printf），使之可用於接受可變數目的引數的方法。今年的微軟2013暑期實習筆試題第一題考的就是這個，我雖然不知道這個具體是什麼意思，但是知道cdecl支援可變數目的引數的方法，這道題就答對了。。。

最後分詞的類是這樣的：

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

namespace FenciTest
{
    [StructLayout(LayoutKind.Explicit)]
    public struct result_t
    {
        [FieldOffset(0)]
        public int start;
        [FieldOffset(4)]
        public int length;
        [FieldOffset(8)]
        public int sPos1;
        [FieldOffset(12)]
        public int sPos2;
        [FieldOffset(16)]
        public int sPos3;
        [FieldOffset(20)]
        public int sPos4;
        [FieldOffset(24)]
        public int sPos5;
        [FieldOffset(28)]
        public int sPos6;
        [FieldOffset(32)]
        public int sPos7;
        [FieldOffset(36)]
        public int sPos8;
        [FieldOffset(40)]
        public int sPos9;
        [FieldOffset(44)]
        public int sPos10;
        //[FieldOffset(12)] public int sPosLow;
        [FieldOffset(48)]
        public int POS_id;
        [FieldOffset(52)]
        public int word_ID;
        [FieldOffset(56)]
        public int word_type;
        [FieldOffset(60)]
        public double weight;
    }

    public class Fenci2013
    {
        const string path = @"NLPIR.dll";//設定dll的路徑
        //對函式進行申明
        [DllImport(path, CharSet = CharSet.Ansi, EntryPoint = "
 
[email protected]@[email protected]", CallingConvention = CallingConvention.Cdecl)]
        public static extern bool NLPIR_Init(String sInitDirPath, int encoding);
        //特別注意，C語言的函式NLPIR_API const char * NLPIR_ParagraphProcess(const char *sParagraph,int bPOStagged=1);必須對應下面的申明
        [DllImport(path, CharSet = CharSet.Auto, CallingConvention = CallingConvention.Cdecl, EntryPoint = "[email protected]@[email protected]")]
        public static extern IntPtr NLPIR_ParagraphProcess(String sParagraph, int bPOStagged = 1);

        [DllImport(path, CharSet = CharSet.Ansi, EntryPoint = "[email protected]@YA_NXZ")]
        public static extern bool NLPIR_Exit();

        [DllImport(path, CharSet = CharSet.Ansi, EntryPoint = "[email protected]@[email protected]")]
        public static extern int NLPIR_ImportUserDict(String sFilename);
        [DllImport(path, CharSet = CharSet.Ansi, EntryPoint = "[email protected]@[email protected]")]
        public static extern bool NLPIR_FileProcess(String sSrcFilename, String sDestFilename, int bPOStagged = 1);

        [DllImport(path, CharSet = CharSet.Ansi, EntryPoint = "[email protected]@@[email protected]")]
        public static extern bool NLPIR_FileProcessEx(String sSrcFilename, String sDestFilename);

        [DllImport(path, CharSet = CharSet.Ansi, EntryPoint = "[email protected]@[email protected]", CallingConvention = CallingConvention.Cdecl)]
        public static extern int NLPIR_GetParagraphProcessAWordCount(String sParagraph);
        //NLPIR_GetParagraphProcessAWordCount
        [DllImport(path, CharSet = CharSet.Ansi, EntryPoint = "[email protected]@[email protected]@@Z",CallingConvention = CallingConvention.Cdecl)]
        public static extern void NLPIR_ParagraphProcessAW(int nCount, [Out, MarshalAs(UnmanagedType.LPArray)] result_t[] result);
        [DllImport(path, CharSet = CharSet.Ansi, EntryPoint = "[email protected]@[email protected]", CallingConvention = CallingConvention.Cdecl)]
        public static extern int NLPIR_AddUserWord(String sWord);
        [DllImport(path, CharSet = CharSet.Ansi, EntryPoint = "[email protected]@YAHXZ")]
        public static extern int NLPIR_SaveTheUsrDic();
        [DllImport(path, CharSet = CharSet.Ansi, EntryPoint = "[email protected]@[email protected]",CallingConvention = CallingConvention.Cdecl)]
        public static extern int NLPIR_DelUsrWord(String sWord);
        [DllImport(path, CharSet = CharSet.Ansi, EntryPoint = "[email protected]@YA_NXZ")]
        static extern bool NLPIR_NWI_Start();
        [DllImport(path, CharSet = CharSet.Ansi, EntryPoint = "[email protected]@YA_NXZ")]
        static extern bool NLPIR_NWI_Complete();
        [DllImport(path, CharSet = CharSet.Ansi, EntryPoint = "[email protected]@[email protected]")]
        static extern bool NLPIR_NWI_AddFile(String sText);
        [DllImport(path, CharSet = CharSet.Ansi, EntryPoint = "[email protected]@[email protected]")]
        static extern bool NLPIR_NWI_AddMem(String sText);
        [DllImport(path, CharSet = CharSet.Ansi, CallingConvention = CallingConvention.Winapi, EntryPoint = "[email protected]@[email protected]")]
        public static extern IntPtr NLPIR_NWI_GetResult(bool bWeightOut = false);
        [DllImport(path, CharSet = CharSet.Ansi, EntryPoint = "[email protected]@YAIXZ")]
        static extern uint NLPIR_NWI_Result2UserDict();
    }
}

 int count = Fenci2013.NLPIR_GetParagraphProcessAWordCount(s);//Fenci先得到結果的詞數
    result_t[] t=new result_t[count];
    Fenci2013.NLPIR_ParagraphProcessAW(count, t);
    System.Console.WriteLine("NLPIR_GetParagraphProcessAWordCount success!");

    result_t[] result = new result_t[count];//在客戶端申請資源
            
    Fenci2013.NLPIR_ParagraphProcessAW(count, result);//獲取結果存到客戶的記憶體中
    foreach (result_t r in result)
    {
        Console.WriteLine(s.Substring(r.start, r.length));
    }