Qt+libcurl实现FTP文件上传和下载

#include "widget.h" #include "ui_widget.h" #include "curl.h" size_t getcontentlengthfunc(void *ptr, size_t size, size_t nmemb, void *stream) { long len = 0; int ret = sscanf((const char*)ptr, "Content-Length: %ld\n", &len); if (ret) { *((long *) stream) = len; } return size * nmemb; } size_t discardfunc(size_t size, size_t nmemb) { return size * nmemb; } size_t writefunc(void *ptr, size_t size, size_t nmemb, void *stream) { return fwrite(ptr, size, nmemb, (FILE*)stream); } 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, "maoye:123456"); 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, "-"); 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++) { if (c) { 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 { 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; } } int download(CURL *curlhandle, const char * remotepath, const char * localpath, long timeout) { 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; if(stat(localpath, &file_info) == 0) { local_file_len = file_info.st_size; use_resume = 1; } f = fopen(localpath, "ab+"); if (f == NULL) { perror(NULL); return 0; } curl_easy_setopt(curlhandle, CURLOPT_URL, remotepath); curl_easy_setopt(curlhandle, CURLOPT_USERPWD, "maoye:123456"); curl_easy_setopt(curlhandle, CURLOPT_CONNECTTIMEOUT, timeout); curl_easy_setopt(curlhandle, CURLOPT_HEADERFUNCTION, getcontentlengthfunc); curl_easy_setopt(curlhandle, CURLOPT_HEADERDATA, &filesize); 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; } } Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget) { ui->setupUi(this); CURL *curlhandle = NULL; CURL *curldwn = NULL; curl_global_init(CURL_GLOBAL_ALL); curlhandle = curl_easy_init(); curldwn = curl_easy_init(); upload(curlhandle, "ftp://192.168.43.252/mao5201234/maoye/maoye.rar", "C:/Users/Administrator/Desktop/90Days.rar", 1, 3); //download(curldwn, "ftp://192.168.43.252/mao/maoye.rar", "C:/Users/Administrator/Desktop/Hello.rar", 1); curl_easy_cleanup(curlhandle); curl_easy_cleanup(curldwn); curl_global_cleanup(); } Widget::~Widget() { delete ui; }