libcurl

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//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;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libcurlcurl_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;}

// 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;}

FTP DOWNLOAD AND UPLOAD USE LIBCURL

#include <stdlib.h>#include <stdio.h>#include <curl/curl.h>#include <sys/stat.h>/* parse headers for Content-Length */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((const char*)ptr, "Content-Length: %ld\n", &len);    if (r) /* Microsoft: we don't read the specs */        *((long *) stream) = len;    return size * nmemb;}/* discard downloaded data */size_t discardfunc(void *ptr, size_t size, size_t nmemb, void *stream) {    return size * nmemb;}//write data to uploadsize_t writefunc(void *ptr, size_t size, size_t nmemb, void *stream){    return fwrite(ptr, size, nmemb, (FILE*)stream);}/* read data to upload */size_t readfunc(void *ptr, size_t size, size_t nmemb, void *stream){    FILE *f = (FILE*)stream;    size_t n;    if (ferror(f))        return CURL_READFUNC_ABORT;    n = fread(ptr, size, nmemb, f) * size;    return n;}int upload(CURL *curlhandle, const char * remotepath, const char * localpath, long timeout, long tries){    FILE *f;    long uploaded_len = 0;    CURLcode r = CURLE_GOT_NOTHING;    int c;    f = fopen(localpath, "rb");    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_USERPWD, "spider:spider");       if (timeout)        curl_easy_setopt(curlhandle, CURLOPT_FTP_RESPONSE_TIMEOUT, timeout);    curl_easy_setopt(curlhandle, CURLOPT_HEADERFUNCTION, getcontentlengthfunc);    curl_easy_setopt(curlhandle, CURLOPT_HEADERDATA, &uploaded_len);    curl_easy_setopt(curlhandle, CURLOPT_WRITEFUNCTION, discardfunc);    curl_easy_setopt(curlhandle, CURLOPT_READFUNCTION, readfunc);    curl_easy_setopt(curlhandle, CURLOPT_READDATA, f);    curl_easy_setopt(curlhandle, CURLOPT_FTPPORT, "-"); /* disable passive mode */    curl_easy_setopt(curlhandle, CURLOPT_FTP_CREATE_MISSING_DIRS, 1L);    curl_easy_setopt(curlhandle, CURLOPT_VERBOSE, 1L);    for (c = 0; (r != CURLE_OK) && (c < tries); c++) {        /* are we resuming? */        if (c) { /* yes */            /* determine the length of the file already written */            /*            * With NOBODY and NOHEADER, libcurl will issue a SIZE            * command, but the only way to retrieve the result is            * to parse the returned Content-Length header. Thus,            * getcontentlengthfunc(). We need discardfunc() above            * because HEADER will dump the headers to stdout            * without it.            */            curl_easy_setopt(curlhandle, CURLOPT_NOBODY, 1L);            curl_easy_setopt(curlhandle, CURLOPT_HEADER, 1L);            r = curl_easy_perform(curlhandle);            if (r != CURLE_OK)                continue;            curl_easy_setopt(curlhandle, CURLOPT_NOBODY, 0L);            curl_easy_setopt(curlhandle, CURLOPT_HEADER, 0L);            fseek(f, uploaded_len, SEEK_SET);            curl_easy_setopt(curlhandle, CURLOPT_APPEND, 1L);        }        else { /* no */            curl_easy_setopt(curlhandle, CURLOPT_APPEND, 0L);        }        r = curl_easy_perform(curlhandle);    }    fclose(f);    if (r == CURLE_OK)        return 1;    else {        fprintf(stderr, "%s\n", curl_easy_strerror(r));        return 0;    }}// 下载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;    struct stat file_info;    int use_resume = 0;    //获取本地文件大小信息    if(stat(localpath, &file_info) == 0)    {        local_file_len = file_info.st_size;         use_resume = 1;    }    //追加方式打开文件，实现断点续传    f = fopen(localpath, "ab+");    if (f == NULL) {        perror(NULL);        return 0;    }    curl_easy_setopt(curlhandle, CURLOPT_URL, remotepath);    curl_easy_setopt(curlhandle, CURLOPT_USERPWD, "spider:spider");       //连接超时设置    curl_easy_setopt(curlhandle, CURLOPT_CONNECTTIMEOUT, timeout);    //设置头处理函数    curl_easy_setopt(curlhandle, CURLOPT_HEADERFUNCTION, getcontentlengthfunc);    curl_easy_setopt(curlhandle, CURLOPT_HEADERDATA, &filesize);    // 设置断点续传    curl_easy_setopt(curlhandle, CURLOPT_RESUME_FROM_LARGE, use_resume?local_file_len:0);    curl_easy_setopt(curlhandle, CURLOPT_WRITEFUNCTION, writefunc);    curl_easy_setopt(curlhandle, CURLOPT_WRITEDATA, 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 *curldwn = NULL;    curl_global_init(CURL_GLOBAL_ALL);    curlhandle = curl_easy_init();    curldwn = curl_easy_init();    upload(curlhandle, "ftp://192.168.0.185/a/success", "D:/abc.jpg", 1, 3);    download(curldwn, "ftp://192.168.0.185/a/success", "D:/abc1.jpg", 1, 3);    curl_easy_cleanup(curlhandle);    curl_easy_cleanup(curldwn);    curl_global_cleanup();    return 0;}

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