Um simples programa para baixar arquivos construído usando C/C++, FLTK, libcURL e POSIX Threads.

http://github.com/gabrield/HaiDownloadManager

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/* compile with "g++ HaiDownLoader.cpp -lfltk -o HaiDownLoader -pedantic -Wall -lcurl" */
 
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
 
#include <FL/Fl.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_Button.H>
#include <FL/Fl_Input.H>
#include <FL/Fl_Progress.H>
#include <FL/Fl_File_Chooser.H>
#include <FL/fl_ask.H>
#include <FL/filename.H>
 
#include <curl/curl.h>
#include <curl/types.h>
#include <curl/easy.h>
 
 
Fl_Progress *pdown = (Fl_Progress*)0;
Fl_Input *f2save = (Fl_Input*)0;
 
size_t write_func(void *ptr, size_t size, size_t nmemb, FILE *stream)
{
  return fwrite(ptr, size, nmemb, stream);
}
 
 
size_t read_func(void *ptr, size_t size, size_t nmemb, FILE *stream)
{
  return fread(ptr, size, nmemb, stream);
}
 
 
int progress_func(Fl_Progress *bar, double t,
                                    double d,
                                    double ultotal,
                                    double ulnow)
{
 
  char prgs[5];
 
  Fl::check();
  //if ((d*100.0/t) == 100.0) fl_alert("Download is finished! :D");
  bar->value(d*100.0/t);
  sprintf(prgs, "%2.2f%%", d*100.0/t);
  bar->copy_label(prgs);
  bar->redraw();
  //printf("%2.2f kb / %2.2f kb (%g %%)\n", d/1024, t/1024, d*100.0/t);
  return 0;
}
 
 
void perform_curl(const char *url, const char *filename, FILE *outfile)
{
    CURL *curl;
    CURLcode res;
 
    curl = curl_easy_init();
 
    outfile = fopen(filename, "w");
    curl_easy_setopt(curl, CURLOPT_URL, url);
    curl_easy_setopt(curl, CURLOPT_WRITEDATA, outfile);
    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_func);
    curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_func);
    curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 0L);
    curl_easy_setopt(curl, CURLOPT_PROGRESSFUNCTION, progress_func);
    curl_easy_setopt(curl, CURLOPT_PROGRESSDATA, pdown);
    printf("URL = %s\n", url);
    printf("FILE = %s\n", filename);
 
    res = curl_easy_perform(curl);
 
    fclose(outfile);
    fl_alert("Download is finished! :D");
    /* always cleanup */
    curl_easy_cleanup(curl);
    return;
}
 
 
void *download_thread(void *ptr)
{
    /*CURL *curl;*/
    /*CURLcode res;*/
    FILE *outfile;
    char *url = (char*)ptr;
    char p2save[256];
    int choice = 0;
 
 
    sprintf(p2save, "%s/%s", f2save->value(), fl_filename_name(url));
    outfile = fopen(p2save, "r");
    if(outfile)
    {
        choice  = fl_choice("File already exists, do you want to overwrite it?", "No", "Yes", NULL);
        switch(choice)
        {
            case 0:
                fclose(outfile);
                break;
            case 1:
                fclose(outfile);
                perform_curl((const char*)url, (const char*)p2save, outfile);
                break;
        }
    }
    else
    {
        perform_curl((const char*)url, (const char*)p2save, outfile);
    }
    return NULL;
}
 
 
void save_file(Fl_Widget*, void *f2save)
{
    char *folder;
    Fl_Input *path = (Fl_Input*)f2save;
 
    folder = fl_dir_chooser("Place to save file",NULL, 0);
    path->value(folder);
 
    return;
}
 
 
void download_file(Fl_Widget*, void *url)
{
    pthread_t dthread;
    pthread_attr_t attr;
    Fl_Input *turl = (Fl_Input *)url;
 
    if(turl->size() == 0 || f2save->size() == 0)
    {
        if(turl->size() == 0)
        {
            fl_alert("Empty URL!");
        }
 
        if (f2save->size() == 0)
        {
            fl_alert("You must select a directory to save the file!");
        }
        return;
    }
    else
    {
        /* Initialize and set thread detached attribute */
         pthread_attr_init(&attr);
         pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
 
         pthread_create(&dthread, &attr, download_thread, (void*)turl->value());
         pthread_join(dthread, NULL);
    }
    return;
}
 
 
void t_exit(Fl_Widget *, void *)
{
    printf("\n");
    exit(0);
}
 
 
int main(int argc, char *argv[])
{
    Fl_Window *mwin;
    Fl_Input *url;
    Fl_Button *btf2save, *bt2down;
    Fl_Group *grp;
    //Fl::scheme("gtk+");
    curl_global_init(CURL_GLOBAL_ALL);
 
    mwin = new Fl_Window((Fl::w() - 360)/2, (Fl::h() - 180)/2, 360, 180, "HaiDownLoader");
    bt2down = new Fl_Button((mwin->w()-350)/2, 150, 350, 25, "Download");
    bt2down->box(FL_GTK_UP_BOX);
    mwin->begin();
    {
        grp = new Fl_Group(5, 5, 350, 140);
        grp->box(FL_GTK_ROUND_UP_BOX);
        {
            url = new Fl_Input(65, 30, 235, 25, "URL:");
 
            f2save = new Fl_Input(135, 60, 165, 25, "Output Directory:");
 
            btf2save = new Fl_Button(305, 60, 40, 25, "...");
            btf2save->box(FL_GTK_UP_BOX);
 
            pdown = new Fl_Progress((grp->w()-250)/2, 100, 250, 25, "0%");
            pdown->color(FL_GREEN);
            pdown->minimum(0);
            pdown->maximum(100);
            pdown->label("0 %");
        }
    }
 
    bt2down->callback(download_file, (void*)url);
    btf2save->callback(save_file, (void*)f2save);
    mwin->end();
    mwin->callback(t_exit);
    mwin->show();
    return Fl::run();
}

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