The Linux Curl API uses the C language

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Chunli ~$ cat main.c  #include  <stdio.h>   #include  <stdlib.h># include <unistd.h> #include  <curl/curl.h>   #include  <string.h>    #include  <ctype.h>   #include  <iconv.h>   #define  tmp_file   "tmp.html"    #define  html_buffer_size 1024*800  void split (char * *arr, char *str, const char *del)  {  char *s = strtok ( Str, del);  while  (s != null)  {  *arr++ = s;   s = strtok (Null, del);   }  }  /* Replace the first occurrence of the STR2 string in the str1 string with Str3*/  void replacefirst (char *str1, char *str2,  CHAR&NBSP;*STR3)  {  char str4[strlen (str1)  + 1];  char *p;   strcpy (STR4,&NBSP;STR1);   if&nbsp, ((P = strstr (STR1,&NBSP;STR2))  != null)/*p point to str2 where it first appeared in Str1 */ {   while  (str1 != p && str1 != null)/* Move the str1 pointer to the position of P */ {   str1++;  }  str1[0] =  ' + ';  /* the value pointed to by the STR1 pointer to/0, to truncate STR1, discard str2 and future content, Keep only str2 previous content */  strcat (STR1,&NBSP;STR3);  /* str1 after Str3, forming a new Str1*/  strcat (STR1,  strstr (STR4,&NBSP;STR2)  + strlen (str2))  /*strstr (STR4,STR2) is a point of str2 and later (including STR2), Strstr ( STR4,STR2) +strlen (STR2) is to move the pointer forward strlen (STR2) bit, skipping str2*/  }  }  /* Replace all str2 that appear in str1 with Str3*/  void replace (char *str1, char *str2, char * STR3)  {  while  (strstr (STR1,&NBSP;STR2)  != null)  {  replacefirst ( STR1,&NBSP;STR2,&NBSP;STR3);   }  }  /* intercept src string, from subscript to start to end-1 (end front) The string is saved in Dest (subscript starting from 0) */  void SUBSTRING (char *dest, char *src, int start, int end)  {  int  i = start;  if  (Start > strlen (SRC)) return;  if  ( End > strlen (SRC))   end = strlen (SRC);  while  (i <  end)  {  dest[i - start] = src[i];  i++;  }   dest[i - start] =  '   return;  }  /* '; Returns the character */  char charat (Char *src, int index) for index in SRC  {  char  *p = src;  int i = 0;  if  (index < 0  | |  index > strlen (SRC))   return 0;  while  (i <  Index) i++;  return p[i];  }  /* returns the location of the first occurrence of str2 in str1 (the following table index), and there is no return -1*/   int indexof (CHAR&NBSP;*STR1,&NBSP;CHAR&NBSP;*STR2)  {  char *p = str1;  int i = 0;   p = strstr (STR1,&NBSP;STR2);  if  (p == null)   return  -1;  else {  while  (str1 != p)  {  str1++;   i++;  }  }  return i;  }  /* returns the location of the last occurrence of str2 in str1 ( Subscript), there is no return -1*/  int lastindexof (CHAR&NBSP;*STR1,&NBSP;CHAR&NBSP;*STR2)  {  char  *p = str1;  int i = 0, len = strlen (STR2);   P = strstr (STR1,&NBSP;STR2);  if  (p == null) return -1;   while  (P != null)  {  for  (;  str1 != p; str1++) i++;   p = p + len;  p = strstr (P,&NBSP;STR2);  }   return i;  }   /* Delete the white space character before the first non-whitespace character on the left of Str (whitespace and Transverse tab) */  void ltrim (CHAR&NBSP;*STR)  {   int i = 0, j, len = strlen (str);  while  (str[i] ! =  ' + ')  {  if  (str[i] != 32 && str[i] != 9) BREAK;&NBSP;/*32: space, 9: Transverse tab */  i++;  }  if  (i != 0)    for  (j = 0; j <= len - i; j++)  {  str[j] =  str[j + i]; /* the following characters to move forward, supplementing the deleted blank position */  }  }  /* Remove all whitespace characters (spaces and transverse tabs) after the last non-whitespace character of Str */  void rtrim (CHAR&NBSP;*STR)  {  char *p  = str;  int i = strlen (str)  - 1;  while  (i  >= 0)  {  if  (p[i] != 32 && p[i] != 9) break;   i--;  }  str[++i] =  ' + ';   }  /* delete whitespace characters at both ends of str */  void trim (char &NBSP;*STR)  {  ltrim (str);   rtrim (str)   }  //This is the callback function that Libcurl receives the data, Equivalent to Recv's dead loop   //where stream can customize the data type, where I pass in the file save path   static size_t write_callback ( Void *ptr, size_t size, size_t nmemb, void *stream)  {  int  len = size * nmemb;  int written = len;  file  *fp = NULL;  const char *pathfile =  (const char*) stream;if   (Access (pathfile,0)  == -1)  {  fp = fopen ((char*)  stream,  " WB "),   } else {  fp = fopen ((char*)  stream, " AB ");   }  if  (FP)  {  fwrite (PTR,&NBSP;SIZE,&NBSP;NMEMB,&NBSP;FP);   }   // printf ("%S\n ", PTR);   fclose (FP);   return written;  }  //Plus-lcurl library    void test_post (Char* url,char* data)  {  curl *curl;  curl  = curl_easy_init ();  if  (Curl)  {  //www.baidu.com/#wd =java   curl_easy_setopt (Curl, curlopt_url, url);   curl_easy_setopt (Curl, CURLOPT_POST, &NBSP;1L);   curl_easy_setopt (curl, curlopt_postfields, data);   curl_easy_perform (curl);   curl_easy_cleanup (curl);   }  fclose (curl);}   int file_exists (Char *filename)  {  return  (Access (filename, 0)  == 0);   }  int getcharset (Char *src_html,char *charcode)  {   char tmp_html[html_buffer_size]={0};  int pos = indexof (src_html,   "text/html; charset=");   if (p os > 0)  {  strncpy (Tmp_html, src_html + pos + strlen (" Text/html; charset= "),  strlen (src_html)  - pos);   pos = indexof (Tmp_ html,  "\" ");  if  (pos > 0)  {  strncpy (charCode, tmp_html,  pos);   }  }  return 0;  }  void test_get ( Char* url)  {  CURL *curl;  CURLcode res;  curl =  Curl_easy_init ();  if  (Curl)  {  if  (file_exists (tmp_file))    Remove (tmp_file);   curl_easy_setopt (curl, curlopt_url, url);   //Specify callback function    curl_easy_setopt (curl, curlopt_writefunction, write_callback);   //This variable can be used as a function of receiving or transmitting data   curl_easy_setopt (curl, curlopt_writedata, tmp_file);   res = curl_ Easy_perform (curl);   char tocode[64] =  "UTF-8";  if  (curle_ok == res)  {   Char *ct;  res = curl_easy_getinfo (CURL,&NBSP;CURLINFO_CONTENT_TYPE,&NBSP;&AMP;CT);   if  ((curle_ok == res)  && ct)   printf ("we received  content-type: %s\n ",  ct);   //printf (" ====\n ");   //int pos=strcspn (CT, "UTF-8");    int index = indexof (ct,  "=");  char* arr[3];   if  (index > 0)  {  split (arr, ct,  "=");   // printf ("%s\n",  arr[1]);   strcpy (tocode, arr[1]); &NBSP;&NBSP;}&NBSP;&NBSP;FILE&NBSP;*FP  = null;  fp = fopen (tmp_file,  "R");   char src_html[html_ Buffer_size]={0};  char *src_html_p = src_html;size_t srclen = strlen ( src_html); char output_htMl[html_buffer_size]={0};  char *output_html_p = output_html;size_t  outlen  = 0;  char tmp_html[HTML_BUFFER_SIZE]={0};  if  (FP)  {   fread (SRC_HTML,&NBSP;HTML_BUFFER_SIZE,&NBSP;1,&NBSP;FP);      strcpy (tmp_html, src_html)   if (index <0)  {  getcharset (Tmp_html,tocode);   printf ("% S\n ", tocode);   }  //Open Character set conversion     iconv_t hiconv = iconv_ Open (Tocode, "iso-8859-1");  if  ( -1 ==  (ssize_t) hiconv)  {  return   //Open failed, may not support character set     }       printf ("%s\n", src_ HTML);   //start converting     //size_t iconv (iconv_t cd,char **inbuf,  Size_t *inbytesleft,char **outbuf, size_t *outbytesleft); Size_t ret = iconv (Hiconv,&src_html_P,&srclen,&output_html_p,&outlen);                   if (ret == -1) {printf ("Conversion failed \ n"); exit (2);} printf ("%s\n",  output_html);     //printf ("OK");   if (strcmp (output_html, "" ) ==0)   {  printf ("%s\n", src_html);   }  //turn off character set conversion      iconv_close (Hiconv);   }  }  curl_easy_cleanup (Curl);  }   }  int main (INT&NBSP;ARGC,&NBSP;CHAR**&NBSP;ARGV)  {  //test_post ("https:// www.baidu.com/"," ");   test_get (" http://www.baidu.com/");   return 0;  } Chunli Soul Bucket Luo ~$

Compile run:

Chunli Soul Bucket Luo ~$ gcc main.c -wall  -l curl && ./a.outwe  received content-type: text/htmlutf-8<! doctype html><!--status ok-->




" This article declined to reprint, Original from http://990487026.blog.51cto.com"

This article from "Soul Bucket Luo" blog, declined reprint!
 Linux Curl API uses C language