针对躲藏的链接和hiddenlinks这两个问题，本篇文章进行了详细的解答，同时本文还将给你拓展(OK)隐马尔可夫模型（HiddenMarkovModel，HMM）server-client、Apac

针对躲藏的链接和hiddenlinks这两个问题，本篇文章进行了详细的解答，同时本文还将给你拓展(OK) 隐马尔可夫模型（Hidden Markov Model，HMM）server - client、Apache不会遵循符号链接（403 Forbidden）、c# – 添加mailto到actionlink的链接、css – Bootstrap3 .visible- * .hidden- * display inline等相关知识，希望可以帮助到你。

• 躲藏的链接（hiddenlinks）（躲藏解析）
• (OK) 隐马尔可夫模型（Hidden Markov Model，HMM）server - client
• Apache不会遵循符号链接（403 Forbidden）
• c# – 添加mailto到actionlink的链接
• css – Bootstrap3 .visible- * .hidden- * display inline

躲藏的链接（hiddenlinks）（躲藏解析）

一种做弊技能，经过它超级链接被规划来被蜘蛛来拜访，而不能被人发现，做弊者从许多高排名的链接到他们想要推动的网页上。

(OK) 隐马尔可夫模型（Hidden Markov Model，HMM）server - client

vim tcp_server.c

/*
[root@bupt src]# cd markov-main/mim-hmm/src

[root@bupt src]# make
[root@bupt src]# ./hxx_baumwelch-1   0.5 0.5 0.5 0.5   0.7 0.2 0.1 0.1 0.2 0.7   0.9 0.1   100
*/

//ztg add
//-----------------------------------
extern "C"
{
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
}
//-----------------------------------



#include "hxx.hpp"

#include <algorithm>
#include <iostream>
#include <vector>
using std::cout;
using std::random_shuffle;
using std::vector;

char buf2[256];
void output_biglambda (const hxx_matrices&);
void hmm (char* argv[]);

//ztg add
//-----------------------------------
int main (int argc, char* argv[])
{
  int iii, BUF_SIZE = 256;
  char buf[BUF_SIZE];
  char *token, *hmm_str[13];

  /* delete the socket file */
  unlink("/data/hmm_socket");

  /* create a socket */
  int server_sockfd = socket(AF_UNIX, SOCK_STREAM, 0);

  struct sockaddr_un server_addr;
  server_addr.sun_family = AF_UNIX;
  strcpy(server_addr.sun_path, "/data/hmm_socket");

  /* bind with the local file */
  bind(server_sockfd, (struct sockaddr *)&server_addr, sizeof(server_addr));

  /* listen */
  listen(server_sockfd, 5);

  int client_sockfd;
  struct sockaddr_un client_addr;
  socklen_t len = sizeof(client_addr);
  while(1)
  {
    printf("server waiting:\n");

    /* accept a connection */
    client_sockfd = accept(server_sockfd, (struct sockaddr *)&client_addr, &len);

    /* exchange data */
    //read(client_sockfd, &ch, 1);
    bzero(buf, BUF_SIZE);
    recv(client_sockfd, buf, BUF_SIZE, MSG_NOSIGNAL);
    printf("get char from client: %s\n", buf);

    iii = 0;
    token = strtok(buf, "-");
    while (token != NULL)
    {
      hmm_str[iii++] = token;
      //printf("%s\n", token);
      token = strtok(NULL, "-");
    }

    for (int i=0; i<13; ++i) printf("%s\n", hmm_str[i]);

    bzero(buf2, BUF_SIZE);
    hmm(hmm_str);
    send(client_sockfd, buf2, strlen(buf2), MSG_NOSIGNAL);

    //bzero(buf2, BUF_SIZE);
    //sprintf(buf2, "%s-%s-%s-%s-%s-%s-%s-%s-%s-%s-%s-%s-%s", hmm_str[0], hmm_str[1], hmm_str[2], hmm_str[3], hmm_str[4], hmm_str[5], hmm_str[6], hmm_str[7], hmm_str[8], hmm_str[9], hmm_str[10], hmm_str[11], hmm_str[12]);
    //send(client_sockfd, buf2, strlen(buf2), MSG_NOSIGNAL);

    /* close the socket */
    close(client_sockfd);
  }

  return 0;
}
//-----------------------------------


//ztg alter
//int main (int argc, char* argv[])
void hmm (char* argv[])
{
//ztg add
//-----------------------------------
/*
    double a1 = atof(argv[1]), a2 = atof(argv[2]), a3 = atof(argv[3]), a4 = atof(argv[4]);
    double b1 = atof(argv[5]), b2 = atof(argv[6]), b3 = atof(argv[7]), b4 = atof(argv[8]), b5 = atof(argv[9]), b6 = atof(argv[10]);
    double p1 = atof(argv[11]), p2 = atof(argv[12]);
    int times = atoi(argv[13]);
//*/
    double a1 = atof(argv[0]), a2 = atof(argv[1]), a3 = atof(argv[2]), a4 = atof(argv[3]);
    double b1 = atof(argv[4]), b2 = atof(argv[5]), b3 = atof(argv[6]), b4 = atof(argv[7]), b5 = atof(argv[8]), b6 = atof(argv[9]);
    double p1 = atof(argv[10]), p2 = atof(argv[11]);
    int times = atoi(argv[12]);
//-----------------------------------

/*
λ = (H, O, A, B, π )
H = {connect, disconnect}
O = {good, moderate, bad}
A = {a11, a12,
     a21, a22};
B = {b11, b12, b13,
     b21, b22, b23};
Pi = {p1, p2};

0.5 0.5 0.5 0.5   0.7 0.2 0.1 0.1 0.2 0.7   0.9 0.1
*/

//ztg alter
//-----------------------------------
/*
    auto A = {.5, .5,
              .5, .5};

    auto B = {.7, .2, .1,
              .1, .2, .7};

    auto Pi = {.9, .1};
//*/
    auto A = {a1, a2,
              a3, a4};

    auto B = {b1, b2, b3,
              b4, b5, b6};

    auto Pi = {p1, p2};
//-----------------------------------


    hxx_matrices biglambda (A, B, Pi);

    hxx_gen hg (A, B, Pi);

    pair<int, int> tmp;

//ztg alter
    //int T = 100000;
    int T = times;

    vector<int> Q (T);
    vector<int> O (T);

    for (int t = 0; t < T; ++t) {
        tmp = hg ();
        Q[t] = tmp.first;
        O[t] = tmp.second;
    }

    vector<double> Xi, Gamma;

    //random_shuffle (O.begin (), O.end ());

    hxx_forwardbackward (O, biglambda, Xi, Gamma);

    hxx_matrices newbiglambda (A, B, Pi);

    hxx_baumwelch (O, Xi, Gamma, newbiglambda);

    for (int t = 4; t < T; ++t) {
        double likelihood = hxx_forward (O.cbegin () + t - 4, O.cbegin () + t + 1, A, B, Pi);
        cout << Q[t] << " " << O[t] << " " << likelihood << "\n";
    }

//ztg alter
//-----------------------------------
//*
    cout << "Original biglambda\n";
    output_biglambda (biglambda);
    cout << "New biglambda\n";
    output_biglambda (newbiglambda);
//*/
    int ii = 0;
    double *hmm_str[12];
    int N = newbiglambda.N ();
    int M = newbiglambda.M ();
    for (int i = 0; i < N; ++i) {
        for (int j = 0; j < N; ++j) {
            hmm_str[ii++] = & newbiglambda.a (i, j);
        }
    }
    for (int i = 0; i < N; ++i) {
        for (int k = 0; k < M; ++k) {
            hmm_str[ii++] = & newbiglambda.b (i, k);
        }
    }
    for (int i = 0; i < N; ++i) {
        hmm_str[ii++] = & newbiglambda.p (i);
    }

    sprintf(buf2, "%.10f-%.10f-%.10f-%.10f-%.10f-%.10f-%.10f-%.10f-%.10f-%.10f-%.10f-%.10f-%d", *hmm_str[0], *hmm_str[1], *hmm_str[2], *hmm_str[3], *hmm_str[4], *hmm_str[5], *hmm_str[6], *hmm_str[7], *hmm_str[8], *hmm_str[9], *hmm_str[10], *hmm_str[11], 100);
    printf("%s\n", buf2);
//-----------------------------------
}

void output_biglambda (const hxx_matrices& biglambda) {
    int N = biglambda.N ();
    int M = biglambda.M ();

    cout << "A = {";
    for (int i = 0; i < N; ++i) {
        for (int j = 0; j < N; ++j) {
            cout << " " << biglambda.a (i, j);
        }
    }
    cout << " }\n";

    cout << "B = {";
    for (int i = 0; i < N; ++i) {
        for (int k = 0; k < M; ++k) {
            cout << " " << biglambda.b (i, k);
        }
    }
    cout << " }\n";

    cout << "Pi = {";
    for (int i = 0; i < N; ++i) {
        cout << " " << biglambda.p (i);
    }
    cout << " }\n";
}

/*
gcc -g -Wall -o tcp_client tcp_client.c
*/

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>

int main()
{
  int iii, BUF_SIZE = 256;
  char buf[BUF_SIZE];
  double hmm[12] = {0.5, 0.5, 0.5, 0.5, 0.7, 0.2, 0.1, 0.1, 0.2, 0.7, 0.9, 0.1};
  int times = 100;
  char *token, *hmm_str[13];

  /* create a socket */
  int sockfd = socket(AF_UNIX, SOCK_STREAM, 0);

  struct sockaddr_un address;
  address.sun_family = AF_UNIX;
  strcpy(address.sun_path, "/data/hmm_socket");

  /* connect to the server */
  int result = connect(sockfd, (struct sockaddr *)&address, sizeof(address));
  if(result == -1)
  {
    perror("connect failed: ");
    exit(1);
  }

  /* exchange data */
  //char ch = ''A'';
  //write(sockfd, &ch, 1);
  //read(sockfd, &ch, 1);

  //printf输出float和double都可以用%f，double还可以用%lf
  //scanf输入float用%f，double输入用%lf，不能混用
  //printf("%10.4f\n",123.45678), 10.4总宽10 (包括小数点), 小数部分保留4位（四舍五入), 结果为：  123.4568(前面两个空格)
  bzero(buf, BUF_SIZE);
  sprintf(buf, "%.10f-%.10f-%.10f-%.10f-%.10f-%.10f-%.10f-%.10f-%.10f-%.10f-%.10f-%.10f-%d", hmm[0], hmm[1], hmm[2], hmm[3], hmm[4], hmm[5], hmm[6], hmm[7], hmm[8], hmm[9], hmm[10], hmm[11], times);
  //linux下当连接断开，还发数据的时候，不仅send()的返回值会有反映，而且还会向系统发送一个异常消息，如果不作处理，系统会出BrokePipe，
  //程序会退出，这对于服务器提供稳定的服务将造成巨大的灾难。为此，send()函数的最后一个参数可以设MSG_NOSIGNAL，禁止send()函数向系统发送异常消息
  send(sockfd, buf, strlen(buf), MSG_NOSIGNAL);
  bzero(buf, BUF_SIZE);
  recv(sockfd, buf, BUF_SIZE, MSG_NOSIGNAL);
  printf("get char from server: %s\n", buf);

  iii = 0;
  token = strtok(buf, "-");
  while (token != NULL)
  {
    hmm_str[iii++] = token;
    //printf("%s\n", token);
    token = strtok(NULL, "-");
  }

  for (int i=0; i<13; ++i) printf("%s\n", hmm_str[i]);

  /* close the socket */
  close(sockfd);

  return 0;
}

Apache不会遵循符号链接（403 Forbidden）

@foreach (var item in Model) {
    <tr>
        <td>
            @{ var email = "mailto:" + item.user.Firstname + "@testmail.org";}
            @Html.ActionLink(item.user.Fullname,email)

        </td>

@{ var email = "mailto:" + item.user.Firstname + "@testmail.org";}
<a href="@email">@item.user.Firstname</a>

Group of classes          | CSS display
 .visible-*-block         |  display: block;
 .visible-*-inline        |  display: inline;
 .visible-*-inline-block  |  display: inline-block;

<p>Device is: <span>Large</span></p>