struct curl_slist *headers=NULL; /* init to NULL is important */

headers = curl_slist_append(headers, "Hey-server-hey: how are you?");

headers = curl_slist_append(headers, "X-silly-content: yes");

/* pass our list of custom made headers */

curl_easy_setopt(easyhandle, CURLOPT_HTTPHEADER, headers);

curl_easy_perform(easyhandle); /* transfer http */

curl_slist_free_all(headers); /* free the header list */

headers = curl_slist_append(headers, "Accept: Agent-007");

headers = curl_slist_append(headers, "Host: munged.host.line"); 

headers = curl_slist_append(headers, "Accept:");

#include <stdio.h>

#include <curl/curl.h>

bool getUrl(char *filename)

{

    CURL *curl;

    CURLcode res;

    FILE *fp;

    if ((fp = fopen(filename, "w")) == NULL)  // 返回结果用文件存储

        return false;

    struct curl_slist *headers = NULL;

    headers = curl_slist_append(headers, "Accept: Agent-007");

    curl = curl_easy_init();    // 初始化

    if (curl)

    {

        //curl_easy_setopt(curl, CURLOPT_PROXY, "10.99.60.201:8080");// 代理

        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);// 改协议头

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

        curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp); //将返回的http头输出到fp指向的文件

        curl_easy_setopt(curl, CURLOPT_HEADERDATA, fp); //将返回的html主体数据输出到fp指向的文件

        res = curl_easy_perform(curl);   // 执行

        if (res != 0) {

            curl_slist_free_all(headers);

            curl_easy_cleanup(curl);

        }

        fclose(fp);

        return true;

    }

}

bool postUrl(char *filename)

{

    CURL *curl;

    CURLcode res;

    FILE *fp;

    if ((fp = fopen(filename, "w")) == NULL)

        return false;

    curl = curl_easy_init();

    if (curl)

    {

        curl_easy_setopt(curl, CURLOPT_COOKIEFILE, "/tmp/cookie.txt"); // 指定cookie文件

        curl_easy_setopt(curl, CURLOPT_POSTFIELDS, "&logintype=uid&u=xieyan&psw=xxx86");    // 指定post内容

        //curl_easy_setopt(curl, CURLOPT_PROXY, "10.99.60.201:8080");

        curl_easy_setopt(curl, CURLOPT_URL, " http://mail.sina.com.cn/cgi-bin/login.cgi ");   // 指定url

        curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp);

        res = curl_easy_perform(curl);

        curl_easy_cleanup(curl);

    }

    fclose(fp);

    return true;

}

int main(void)

{

    getUrl("/tmp/get.html");

    postUrl("/tmp/post.html");

}

#include <stdio.h>

#include <curl/curl.h>

#include <stdlib.h>

int main(int argc, char *argv[])

{

    CURL *curl;             //定义CURL类型的指针

CURLcode res;           //定义CURLcode类型的变量，保存返回状态码

    if(argc!=2)

    {

        printf("Usage : file <url>;\n");

        exit(1);

    }

    curl = curl_easy_init();        //初始化一个CURL类型的指针

    if(curl!=NULL)

    {

        //设置curl选项. 其中CURLOPT_URL是让用户指 定url. argv[1]中存放的命令行传进来的网址

        curl_easy_setopt(curl, CURLOPT_URL, argv[1]);

        //调用curl_easy_perform 执行我们的设置.并进行相关的操作. 在这 里只在屏幕上显示出来.

        res = curl_easy_perform(curl);

        //清除curl操作.

        curl_easy_cleanup(curl);

    }

    return 0;

}

// 采用CURLOPT_WRITEFUNCTION 实现网页下载保存功能

#include <stdio.h>;

#include <stdlib.h>;

#include <unistd.h>;

#include <curl/curl.h>;

#include <curl/types.h>;

#include <curl/easy.h>;

FILE *fp;  //定义FILE类型指针

//这个函数是为了符合CURLOPT_WRITEFUNCTION而构造的

//完成数据保存功能

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

{

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

    return written;

}

int main(int argc, char *argv[])

{

    CURL *curl;

    curl_global_init(CURL_GLOBAL_ALL);

    curl=curl_easy_init();

    curl_easy_setopt(curl, CURLOPT_URL, argv[1]);  

    if((fp=fopen(argv[2],"w"))==NULL)

    {

        curl_easy_cleanup(curl);

        exit(1);

    }

////CURLOPT_WRITEFUNCTION 将后继的动作交给write_data函数处理

    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);

    curl_easy_perform(curl);

    curl_easy_cleanup(curl);

    exit(0);

}

// 采用CURLOPT_NOPROGRESS， CURLOPT_PROGRESSFUNCTION    CURLOPT_PROGRESSDATA 实现文件传输进度提示功能

//函数采用了gtk库，故编译时需指定gtk库

//函数启动专门的线程用于显示gtk 进度条bar

#include <stdio.h>

#include <gtk/gtk.h>

#include <curl/curl.h>

#include <curl/types.h> /* new for v7 */

#include <curl/easy.h> /* new for v7 */

GtkWidget *Bar;

////这个函数是为了符合CURLOPT_WRITEFUNCTION而构造的

//完成数据保存功能

size_t my_write_func(void *ptr, size_t size, size_t nmemb, FILE *stream)

{

  return fwrite(ptr, size, nmemb, stream);

}

//这个函数是为了符合CURLOPT_READFUNCTION而构造的

//数据上传时使用

size_t my_read_func(void *ptr, size_t size, size_t nmemb, FILE *stream)

{

  return fread(ptr, size, nmemb, stream);

}

//这个函数是为了符合CURLOPT_PROGRESSFUNCTION而构造的

//显示文件传输进度，t代表文件大小，d代表传 输已经完成部分

int my_progress_func(GtkWidget *bar,

                     double t, /* dltotal */

                     double d, /* dlnow */

                     double ultotal,

                     double ulnow)

{

/*  printf("%d / %d (%g %%)\n", d, t, d*100.0/t);*/

  gdk_threads_enter();

  gtk_progress_set_value(GTK_PROGRESS(bar), d*100.0/t);

  gdk_threads_leave();

  return 0;

}

void *my_thread(void *ptr)

{

  CURL *curl;

  CURLcode res;

  FILE *outfile;

  gchar *url = ptr;

  curl = curl_easy_init();

  if(curl)

  {

    outfile = fopen("test.curl", "w");

    curl_easy_setopt(curl, CURLOPT_URL, url);

    curl_easy_setopt(curl, CURLOPT_WRITEDATA, outfile);

    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, my_write_func);

    curl_easy_setopt(curl, CURLOPT_READFUNCTION, my_read_func);

    curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 0L);

    curl_easy_setopt(curl, CURLOPT_PROGRESSFUNCTION, my_progress_func);

    curl_easy_setopt(curl, CURLOPT_PROGRESSDATA, Bar);

    res = curl_easy_perform(curl);

    fclose(outfile);

    /* always cleanup */

    curl_easy_cleanup(curl);

  }

  return NULL;

}

int main(int argc, char **argv)

{

  GtkWidget *Window, *Frame, *Frame2;

  GtkAdjustment *adj;

  /* Must initialize libcurl before any threads are started */

  curl_global_init(CURL_GLOBAL_ALL);

  /* Init thread */

  g_thread_init(NULL);

  gtk_init(&argc, &argv);

  Window = gtk_window_new(GTK_WINDOW_TOPLEVEL);

  Frame = gtk_frame_new(NULL);

  gtk_frame_set_shadow_type(GTK_FRAME(Frame), GTK_SHADOW_OUT);

  gtk_container_add(GTK_CONTAINER(Window), Frame);

  Frame2 = gtk_frame_new(NULL);

  gtk_frame_set_shadow_type(GTK_FRAME(Frame2), GTK_SHADOW_IN);

  gtk_container_add(GTK_CONTAINER(Frame), Frame2);

  gtk_container_set_border_width(GTK_CONTAINER(Frame2), 5);

  adj = (GtkAdjustment*)gtk_adjustment_new(0, 0, 100, 0, 0, 0);

  Bar = gtk_progress_bar_new_with_adjustment(adj);

  gtk_container_add(GTK_CONTAINER(Frame2), Bar);

  gtk_widget_show_all(Window);

  if (!g_thread_create(&my_thread, argv[1], FALSE, NULL) != 0)

    g_warning("can't create the thread");

  gdk_threads_enter();

  gtk_main();

  gdk_threads_leave();

  return 0;

}

//采用CURLOPT_RESUME_FROM_LARGE 实现文件断点续传功能

#include <stdlib.h>

#include <stdio.h>

#include <sys/stat.h>

#include <curl/curl.h>

//这个函数为CURLOPT_HEADERFUNCTION参数构造

/* 从http头部获取文件size*/

size_t getcontentlengthfunc(void *ptr, size_t size, size_t nmemb, void *stream) {

       int r;

       long len = 0;

       /* _snscanf() is Win32 specific */

       // r = _snscanf(ptr, size * nmemb, "Content-Length: %ld\n", &len);

 r = sscanf(ptr, "Content-Length: %ld\n", &len);

       if (r) /* Microsoft: we don't read the specs */

              *((long *) stream) = len;

       return size * nmemb;

}

/* 保存下载文件 */

size_t wirtefunc(void *ptr, size_t size, size_t nmemb, void *stream)

{

        return fwrite(ptr, size, nmemb, stream);

}

/*读取上传文件 */

size_t readfunc(void *ptr, size_t size, size_t nmemb, void *stream)

{

       FILE *f = stream;

       size_t n;

       if (ferror(f))

              return CURL_READFUNC_ABORT;

       n = fread(ptr, size, nmemb, f) * size;

       return n;

}

// 下载 或者上传文件函数

int download(CURL *curlhandle, const char * remotepath, const char * localpath,

           long timeout, long tries)

{

       FILE *f;

       curl_off_t local_file_len = -1 ;

       long filesize =0 ;

       CURLcode r = CURLE_GOT_NOTHING;

       int c;

  struct stat file_info;

  int use_resume = 0;

  /* 得到本地文件大小 */

  //if(access(localpath,F_OK) ==0)

    if(stat(localpath, &file_info) == 0)

     {

        local_file_len =  file_info.st_size;

        use_resume  = 1;

      }

  //采用追加方式打开文件，便于实现文件断点续传工作

       f = fopen(localpath, "ab+");

       if (f == NULL) {

              perror(NULL);

              return 0;

       }

       //curl_easy_setopt(curlhandle, CURLOPT_UPLOAD, 1L);

       curl_easy_setopt(curlhandle, CURLOPT_URL, remotepath);

              curl_easy_setopt(curlhandle, CURLOPT_CONNECTTIMEOUT, timeout);  // 设置连接超时，单位秒

       //设置http 头部处理函数

       curl_easy_setopt(curlhandle, CURLOPT_HEADERFUNCTION, getcontentlengthfunc);

       curl_easy_setopt(curlhandle, CURLOPT_HEADERDATA, &filesize);

 // 设置文件续传的位置给libcurl

       curl_easy_setopt(curlhandle, CURLOPT_RESUME_FROM_LARGE, use_resume?local_file_len:0);

       curl_easy_setopt(curlhandle, CURLOPT_WRITEDATA, f);

       curl_easy_setopt(curlhandle, CURLOPT_WRITEFUNCTION, wirtefunc);

       //curl_easy_setopt(curlhandle, CURLOPT_READFUNCTION, readfunc);

       //curl_easy_setopt(curlhandle, CURLOPT_READDATA, f);

       curl_easy_setopt(curlhandle, CURLOPT_NOPROGRESS, 1L);

       curl_easy_setopt(curlhandle, CURLOPT_VERBOSE, 1L);

  r = curl_easy_perform(curlhandle);

       fclose(f);

       if (r == CURLE_OK)

              return 1;

       else {

              fprintf(stderr, "%s\n", curl_easy_strerror(r));

              return 0;

       }

}

int main(int c, char **argv) {

       CURL *curlhandle = NULL;

       curl_global_init(CURL_GLOBAL_ALL);

       curlhandle = curl_easy_init();

       //download(curlhandle, "ftp://user:pass@host/path/file", "C:\\file", 0, 3);

  download(curlhandle , "http://software.sky-union.cn/index.asp","/work/index.asp",1,3);

       curl_easy_cleanup(curlhandle);

       curl_global_cleanup();

       return 0;

}