在< ...>之间的C条html [英] C strip html between <...>
问题描述
我如何使用C在HTML文档中的< ...>标记之间以及包含< ...>标记的地方剥离HTML?我当前的程序使用curl获取网页的内容并将其放入文本文件，然后从文本文件读取并删除<>，但是我不确定如何删除这些标记之间的所有内容.
How can i strip the HTML from document between and including the <...> tags in a HTML document using C? My current program uses curl to get the contents of the webpage and puts it into a text file, it then reads from the text file and removes the <>, but i am unsure of how to remove everything between those tags.
#include <curl/curl.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#define WEBPAGE_URL "http://homepages.paradise.net.nz/adrianfu/index.html"
#define DESTINATION_FILE "/home/user/data.txt"
size_t write_data( void *ptr, size_t size, size_t nmeb, void *stream)
{
return fwrite(ptr,size,nmeb,stream);
}
int main()
{
int in_tag = 0;
char * buffer;
char c;
long lSize;
size_t result;
FILE * file = fopen(DESTINATION_FILE,"w+");
if (file==NULL) {
fputs ("File error",stderr);
exit (1);
}
CURL *handle = curl_easy_init();
curl_easy_setopt(handle,CURLOPT_URL,WEBPAGE_URL); /*Using the http protocol*/
curl_easy_setopt(handle,CURLOPT_WRITEFUNCTION, write_data);
curl_easy_setopt(handle,CURLOPT_WRITEDATA, file);
curl_easy_perform(handle);
curl_easy_cleanup(handle);
int i, nRead, fd;
int source;
char buf[1024];
if((fd = open("data.txt", O_RDONLY)) == -1)
{
printf("Cannot open the file");
}
else
{
nRead = read(fd, buf, 1024);
printf("Original String ");
for(i=0; i<nRead; i++)
{
printf("%c", buf[i]);
}
printf("\nReplaced String ");
for(i=0; i<nRead; i++)
{
if(buf[i]=='<' || buf[i]=='>'){
buf[i]=' ';
}
printf("%c", buf[i]);
}
}
close(source);
return 0;
}
推荐答案
仅放置用于删除<"之间内容的代码和'>'标签(假设您使用正确的html，意味着您没有在另一个标签的声明中嵌套一个标签，例如< html< body>> ).我只更改您的代码的一小部分.我还将从 buf 变量中删除标签，而不是用间隔替换不想要的字符，因为我认为这对您更有用(如果我错了，请纠正我).
Placing just the code that removes the contents between the '<' and '>' tags (assuming that you deal with proper html, meaning that you don't have one tag nested in the declaration of the other like <html < body> >). I am just changing a small portion of your code. I will also remove the tags from the buf variable, instead of replacing the undesired characters with intervals, because I think this will be more useful to you (correct me if I am wrong).
int idx = 0;
int opened = 0; // false
for(i=0; i<nRead; i++)
{
if(buf[i]=='<') {
opened = 1; // true
} else if (buf[i] == '>') {
opened = 0; // false
} else if (!opened) {
buf[idx++] = buf[i];
}
}
buf[idx] = '\0';
printf("%s\n", buf);
这篇关于在< ...>之间的C条html的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
