关于c:Linux网络开发必学教程29动态创建交互页面

37次阅读

共计 4294 个字符，预计需要花费 11 分钟才能阅读完成。

问题：如何创立浏览器中的文件展现页面？

再论前端页面

交互页面剖析

  • 动态局部

    • 表格，页面构造

  • 动静局部

    • 文件浏览门路 (Path)
    • 文件列表（Table）
"<!DOCTYPE html>"
"<html>"
"<head>"
"<meta charset=\"utf-8\">"
"<title>D.T.Software</title>"
"<head>"
"<body>"
"<h1>DT4SW Http File Server</h1>"
"<hr/>"
"<h3>Path: %s</h3>"
"%s"
"<body>"
"<html>"

文件列表剖析

  • 动态

    • 表格题目行
    • 表格列表构造

  • 动静局部

    • 表格行数据 
"<table border=\"1\"width=\"100%\">";
"<tr>"
"<th>File Name</th><th>File Type</th><th>File Size</th><th>Modify Time</th>"
"</tr>"
"<td><a href=\"%s\">%s</a></td><td>%s</td><td>%s</td><td>%s</td>"
"</tr>"
"</table>"

文件列表接口函数及数据结构

  • Table *CreateTable();
  • Table *InsertRow(Table *table, RowInfo *info);
  • char *ToTableString(Table *table);
  • void FreeTable(Table *table);
typedef void Table;
typedef struct {char link[2048];
    char name[255];
    char type[32];
    char size[32];
    char time[32];
}RowInfo;

解决方案

  • CreateTable()

    • 从堆空间创建表格题目行，并作为初始表格数据返回

  • InsertRow(table, info)

    • 将 info 中的字符串进行表格行格式化，并增加到 table 开端

  • ToTableString(table)

    • 将 table 表格数据格式化为 HTML 字符串，并返回

表格动态创建要害代码 

if (table && info) {
    char *t = table;
    int len = strlen(t);
    char *buf = malloc(strlen(ROW_FORMAT) + sizeof(*info));
    if (buf) {sprintf(buf, ROW_FORMAT, info->link, info->name, info->type, info->size, info->time);
        ret = realloc(t, len + strlen(buf) + 1);
        ret = ret ? (strcpy(ret + len, buf), ret) : t;
    } else {ret = t;}
    free(buf);
}

页面动态创建代码 

char *ToPageString(const char *path, char *ts)
{
    char *ret = NULL;

    if (path && ts && (ret = malloc(strlen(PAGE_FORMAT) + strlen(path) + strlen(ts) + 1))) {sprintf(ret, PAGE_FORMAT, path, ts);
    }

    return ret;
}

编程试验：动态创建交互页面

main.c

#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
#include<pthread.h>
#include <sys/types.h>
#include <dirent.h>
#include <sys/stat.h>
#include <time.h>
#include <fcntl.h>
#include <string.h>

#include "tcp_server.h"
#include "tcp_client.h" 
#include "utility.h"
#include "page.h"

int main(int argc, char *argv[])
{Table *t = CreateTable();
    RowInfo ri = {"aa", "bbb", "cccc", "ddddd", "eeeeee"};
    RowInfo rj = {"11", "222", "3333", "44444", "555555"};

    t = InsertRow(t, &ri);
    t = InsertRow(t, &rj);

    char *ts = ToTableString(t);
    char *page = ToPageString("test/path/folder", ts);

    printf("%s\n", page);

    free(page);
    free(ts);
    FreeTable(t);

    return 0;
}

page.h

#ifndef PAGE_H
#define PAGE_H

typedef void Table;

typedef struct
{char link[2048];
    char name[255];
    char type[32];
    char size[32];
    char time[32];
} RowInfo;

char* ToPageString(const char* path, const char* ts);
Table* CreateTable();
Table* InsertRow(Table* table, RowInfo* info);
char* ToTableString(Table* table);
void FreeTable(Table* table);

#endif  // PAGE_H

page.c

#include "page.h"

#include <stdlib.h>
#include <string.h>
#include <stdio.h>

static const char* PAGE_FORMAT = "<!DOCTYPE html>"
                                 "<html>"
                                 "<head>"
                                 "<meta charset=\"utf-8\">"
                                 "<title>D.T.Software</title>"
                                 "</head>"
                                 "<body>"
                                 "<h1>DT4SW Http File Server</h1>"
                                 "<hr/>"
                                 "<h3>Path: %s</h3>"
                                 "%s"
                                 "</body>"
                                 "</html>";

static const char* TABLE_BEGIN = "<table border=\"1\"width=\"100%\">";
                                                                  
static const char* TABLE_TITLE = "<tr>"
                                 "<th>File Name</th><th>File Type</th><th>File Size</th><th>Modify Time</th>"
                                 "</tr>";
                                
static const char* ROW_FORMAT =  "<tr>"
                                 "<td><a href=\"%s\">%s</a></td><td>%s</td><td>%s</td><td>%s</td>"
                                 "</tr>";     
                                
static const char* TABLE_END =   "</tr>"
                                 "</table>";  

char *ToPageString(const char *path, const char *ts)
{
    char *ret = NULL;

    if (path && ts && (ret = malloc(strlen(PAGE_FORMAT) + strlen(path) + strlen(ts) + 1))) {sprintf(ret, PAGE_FORMAT, path, ts);
    }

    return ret;
}

Table *CreateTable()
{const int TITLE_LEN = strlen(TABLE_TITLE);
    char *ret = malloc(TITLE_LEN + 1);

    if (ret) {strcpy(ret, TABLE_TITLE);
    }

    return ret;
}

char *ToTableString(Table *table)
{const int BEGIN_LEN = strlen(TABLE_BEGIN);
    const int END_LEN = strlen(TABLE_END);
    char *ret = NULL;

    if (table && (ret = malloc(strlen(table) + BEGIN_LEN + END_LEN + 1))) {strcpy(ret, TABLE_BEGIN);
        strcpy(ret + BEGIN_LEN, table);
        strcpy(ret  + BEGIN_LEN + strlen(table), TABLE_END);
    }

    return ret;
}

Table *InsertRow(Table *table, RowInfo *info)
{
    char *ret = NULL;

    if (table && info) {
        char *t = table;
        int len = strlen(t);
        char *buf = malloc(strlen(ROW_FORMAT) + sizeof(*info));
        if (buf) {sprintf(buf, ROW_FORMAT, info->link, info->name, info->type, info->size, info->time);
            ret = realloc(t, len + strlen(buf) + 1);
            ret = ret ? (strcpy(ret + len, buf), ret) : t;
        } else {ret = t;}
        free(buf);
    }

    return ret;
}

void FreeTable(Table *table)
{free(table);
}

输入 

<!DOCTYPE html><html>  <head>    <meta charset="utf-8">    <title>D.T.Software</title>  </head>  <body>    <h1>DT4SW Http File Server</h1>    <hr/>    <h3>Path: test/path/folder</h3>    <table border="1" width="100%">  <tr>    <th>File Name</th><th>File Type</th><th>File Size</th><th>Modify Time</th>  </tr><tr>  <td><a href="aa">bbb</a></td><td>cccc</td><td>ddddd</td><td>eeeeee</td></tr><tr>  <td><a href="11">222</a></td><td>3333</td><td>44444</td><td>555555</td></tr>  </tr></table>  </body></html>

思考

浏览器于文件服务器如何交互？

正文完
c
发表至： c#
2023-06-05
 0
关于c++:C五花八门的C初始化规则
关于c++:二分
关于c++:HackingC-Learning笔记-Chapter11Memory-Management
关于c++:熬夜整理近百份大厂面经2022校招提前批面经总结分享腾讯字节阿里百度京东等招聘信息必考点简历书写