c++ - UrlToDownloadFile function not downloading -

i using urltodownloadfile function, doesn't download file. no error shown in compiler (using vstudio 2012)

here code:

#include <windows.h> #include "urlmon.h"  #pragma lib "urlmon.lib"  using namespace std;  void dwfile();   int _tmain(int argc, _tchar* argv[]) {     dwfile ();     return 0; }  void dwfile ()  {     lpcstr url = ("http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3337.pdf");     lpcstr fpath = ("c:\\users\\andyy\\desktop\\test\\n3337.pdf");      hresult urldownloadtofile ((null, url, fpath, 0, null)); } 

your code not doing error handling, , string handling wrong. use instead:

#include <windows.h> #include "urlmon.h"  #pragma lib "urlmon.lib"  using namespace std;  void dwfile();  int _tmain(int argc, _tchar* argv[]) {     dwfile ();     return 0; }  void dwfile ()  {     lpctstr url = text("http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3337.pdf");     lpctstr fpath = text("c:\\users\\andyy\\desktop\\test\\n3337.pdf");      hresult hr = urldownloadtofile (null, url, fpath, 0, null);     if (failed(hr))     {         // ...     }      /* or more preffered:      lpcwstr url = l"http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3337.pdf";     lpcwstr fpath = l"c:\\users\\andyy\\desktop\\test\\n3337.pdf");      hresult hr = urldownloadtofilew (null, url, fpath, 0, null);     if (failed(hr))     {         // ...     }     */ } 

do note following comment in documentation:

urldownloadtofile returns s_ok even if file cannot created , download canceled. if szfilename parameter contains file path, ensure destination directory exists before calling urldownloadtofile. for best control on download , progress, ibindstatuscallback interface recommended.