c练习总结

undefined reference to `curl_easy_init'

2010-07-23 21:08

mmxcq@mmxcq-laptop:~/c/curl$ gcc -o q q.c 
/tmp/ccyOh5HP.o: In function `main':
q.c:(.text+0x103): undefined reference to `curl_easy_init'
q.c:(.text+0x148): undefined reference to `curl_easy_setopt'
q.c:(.text+0x16c): undefined reference to `curl_easy_setopt'
q.c:(.text+0x190): undefined reference to `curl_easy_setopt'
q.c:(.text+0x19c): undefined reference to `curl_easy_perform'
q.c:(.text+0x1dc): undefined reference to `curl_easy_cleanup'
collect2: ld returned 1 exit status

gcc libcurl的时候出现这个 原来是没加curl路径  
gcc -l curl  -o q q.c 就可以了

将header和body分开存储到文件中

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

 

#include <curl/curl.h>

 

static size_t write_data(void *ptr, size_t size, size_t nmemb, void *stream)

{

  int written = fwrite(ptr, size, nmemb, (FILE *)stream);

  return written;

}

 

int main(void)

{

  CURL *curl_handle;

  static const char *headerfilename = "head.out";

  FILE *headerfile;

  static const char *bodyfilename = "body.out";

  FILE *bodyfile;

 

  curl_global_init(CURL_GLOBAL_ALL);

 

  /* init the curl session */ 

  curl_handle = curl_easy_init();

 

  /* set URL to get */ 

  curl_easy_setopt(curl_handle, CURLOPT_URL, "http://www.baidu.com");

 

  /* no progress meter please */ 

  curl_easy_setopt(curl_handle, CURLOPT_NOPROGRESS, 1L);

 

  /* send all data to this function  */ 

  curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, write_data);

 

  /* open the files */ 

  headerfile = fopen(headerfilename,"w");

  if (headerfile == NULL) {

    curl_easy_cleanup(curl_handle);

    return -1;

  }

  bodyfile = fopen(bodyfilename,"w");

  if (bodyfile == NULL) {

    curl_easy_cleanup(curl_handle);

    return -1;

  }

 

  /* we want the headers to this file handle */ 

  curl_easy_setopt(curl_handle,   CURLOPT_WRITEHEADER, headerfile);

  curl_easy_setopt(curl_handle,   CURLOPT_WRITEDATA, bodyfile);

  /*

   * Notice here that if you want the actual data sent anywhere else but

   * stdout, you should consider using the CURLOPT_WRITEDATA option.  */ 

 

  /* get it! */ 

  curl_easy_perform(curl_handle);

 

  /* close the header file */ 

  fclose(headerfile);

  /* close the header file */ 

  fclose(bodyfile); 

  /* cleanup curl stuff */ 

  curl_easy_cleanup(curl_handle);

 

  return 0;

}