Programmatically download a shared file using C++ Curl

Dear Greg,

Thank you for your kind support. Here is what I did:

1- I got rid of "dl=0" URL.

2- I got ride of URLDownladToFile(). I will stick to curl library.

3- I got ride of curl_easy_setopt (curl,CURLOPT_HTTPPROXYTUNNEL,1) ;

4- I am not using any proxy. 

5- I still receive (6) CURL_COULDNT_RESOLVE_HOST error.

6- When I say receive nothing, I mean the downloaded file size is zero byte.

7- I uploaded the cpp file and tried to downloaded it (1.45 KB). The downloaded file size is still zero byte.

Below is the new code with above changes:

#include "Stdafx.h"
#include "curl.h"
#include "Download.h"

static const char* FileURL =
"https://www.dropbox.com/s/4cn3neh4omhhzr5/Download.cpp?dl=1" ;

static size_t write_data (void *ptr,size_t size,size_t nmemb,void* stream)
{
size_t written = fwrite (ptr,size,nmemb,(FILE * ) stream) ;
return written ;
}

int DownloadFile ()
{
static char TargetFile[] = "E:\\Download\\DownloadCURL\\Download.cpp" ;

// Download the file using curl library into DownloadCURL folder
if (auto curl = curl_easy_init ()) {
auto fp = fopen (TargetFile,"wb") ;
curl_easy_setopt (curl,CURLOPT_URL,FileURL) ;
curl_easy_setopt (curl,CURLOPT_WRITEFUNCTION,write_data) ;
curl_easy_setopt (curl,CURLOPT_FOLLOWLOCATION,1) ;
curl_easy_setopt (curl,CURLOPT_FAILONERROR,1) ;
curl_easy_setopt (curl,CURLOPT_WRITEDATA,fp) ;

/* Perform the request, res will get the return code */
auto res = curl_easy_perform (curl) ;

fclose (fp) ;
curl_easy_cleanup (curl) ;
} /* if (auto curl = curl_easy_init ()) */

return true ;

} /* Download */

If everything else is correct, could it be that my curl library is not functioning properly?

I downloaded the source code for the library (version 7-67.0). There were many options to apply during the compilation. I once built it with OpenSSL support. Then removed the OpenSSL support following a post I read about Windows / OpenSSL compatibility.

So any suggestion regarding building the library will be much appreciated.

Thanks again for your help