Download using Urlopenstream under C + +

Although Urldownloadtofile is convenient, you may want to use Urlopenstream to achieve more complex requirements.

But it's still a bit tricky to check MSDN, and here's the sample code directly:

1#include <iostream>2#include <cstdio>3#include <UrlMon.h>4 #pragmaComment (lib, "Urlmon.lib")5#include <tchar.h>6#include <fstream>7 8 classMyListener: PublicIBindStatusCallback9 {Ten  Public: One  A stdmethod (onstartbinding) ( - DWORD dwreserved, -IBinding __RPC_FAR *PIB) the     { -         returnE_NotImpl; -     } -  + stdmethod (getpriority) ( -LONG __RPC_FAR *pnpriority) +     { A         returnE_NotImpl; at     } -  - stdmethod (Onlowresource) ( - DWORD reserved) -     { -         returnE_NotImpl; in     } -  to stdmethod (onprogress) ( +ULONG ulprogress,//Current Size -ULONG ulProgressMax,//Total size the ULONG Ulstatuscode, * lpcwstr szStatusText) $     {Panax Notoginseng         if(ulProgressMax! =0) -         { theStd::cout << ulprogress *100.0/ulProgressMax <<"%\t"<< Ulstatuscode <<"\ n"; +         } A         returnS_OK; the     } +  - stdmethod (onstopbinding) ( $ HRESULT HRESULT, $ lpcwstr Szerror) -     { -         returnE_NotImpl; the     } - Wuyi stdmethod (getbindinfo) ( theDWORD __RPC_FAR *GRFBINDF, -Bindinfo __RPC_FAR *pbindinfo) Wu     { -         returnE_NotImpl; About     } $  - stdmethod (ondataavailable) ( - DWORD GRFBSCF, - DWORD dwsize, AFORMATETC __RPC_FAR *Pformatetc, +STGMEDIUM __RPC_FAR *pstgmed) the     { -             //bscf_firstdatanotification = 0x00000001, $             //bscf_intermediatedatanotification = 0x00000002, the             //bscf_lastdatanotification = 0x00000004, the         //possible for bscf_firstdatanotification, Bscf_firstdatanotification & Bscf_lastdatanotification, BSCF_ Intermediatedatanotification, Bscf_lastdatanotification the         //that could be a package, two packages, or multiple packages the         if(GRFBSCF &bscf_firstdatanotification) -         { inPstgmed->pstm->read (Mdata, dwsize, &msize); the         } the         Else About         { the ULONG size; thePstgmed->pstm->read (Mdata + msize, dwsize, &size); theMsize + =size; +Std::cout << dwsize <<"\ t"<< size <<"\ t"<< msize <<"\ n"; -         } the Bayi          the         returnS_OK; the     } -  - stdmethod (onobjectavailable) ( the REFIID riid, theIUnknown __RPC_FAR *punk) the     { the         returnE_NotImpl; -     } the  the stdmethod_ (ULONG, AddRef) () the     {94         return 0; the     } the  the stdmethod_ (ULONG, Release) ()98     { About         return 0; -     }101 102 Stdmethod (QueryInterface) (103 REFIID riid,104         void__rpc_far *__rpc_far *ppvobject) the     {106         returnE_NotImpl;107     }108 109     voidSaveChar*fileName) the     {111 File.Open (FileName, std::ios::binary); the File.write (Mdata, msize);113 file.close (); the     } the Private: the std::ofstream file;117 ULONG msize;118     Charmdata[ -*1024x768];119 }; - 121 122 intMainintargcChar*argv[])123 {124     Charurl[ the]; the     Charfilename[ the];127  -mylistener* listener =NewMyListener; $HRESULT result = Urlopenstream (0Url0, listener);141             if(Result = =S_OK)142             {143Listener->Save (fileName);144             }145             Else146             {147Std::cout << Result <<"failure!\n";148             }149 the 153     DeleteListener;154 155System"Pause");156}

Download using Urlopenstream under C + +