"Go" C + + http download file

#include <afx.h> #include <afxinet.h> #define Recvpack_size 2048bool downloadsavefiles (char* Url,char *    Strsavefile) {//download file and save as new file name bool Ret=false;    CInternetSession sess ("Lpload"); Sess.setoption (Internet_option_connect_timeout, 2000); 2 Seconds of Connection timeout sess.setoption (Internet_option_send_timeout, 2000); 2-Second Send timeout sess.setoption (internet_option_receive_timeout, 2000); 2-second receive timeout sess.setoption (Internet_option_data_send_timeout, 2000); 2-Second Send timeout sess.setoption (internet_option_data_receive_timeout, 2000); 2-second receive timeout DWORD Dwflag = internet_flag_transfer_binary| internet_flag_dont_cache|    Internet_flag_reload;    chttpfile* cFile = NULL;    char *pbuf = NULL;    int nbuflen = 0;            do {try{cFile = (chttpfile*) sess.openurl (Url,1,dwflag);            DWORD Dwstatuscode;            Cfile->queryinfostatuscode (Dwstatuscode);              if (Dwstatuscode = = HTTP_STATUS_OK) {//query file length  DWORD nlen=0;                Cfile->queryinfo (Http_query_content_length, Nlen);                CString strFileName = GetFileName (url,true);                Nbuflen=nlen;                if (nlen <= 0) break;////Allocate receive data cache PBuf = (char*) malloc (nlen+8);                ZeroMemory (PBUF,NLEN+8);                Char *p=pbuf; while (nlen>0) {//per download 8K int n = cfile->read (p, (nlen<recvpack_size)? nlen:r                    Ecvpack_size);                    Receive complete exit loop if (n <= 0) break;////Receive cache after move p+= N;                The remaining length is decremented by nlen-= n;                }//If you have not received the interrupt exit if (Nlen! = 0) break; Received successfully saved to file CFile files (strsavefile, Cfile::modecreate |                Cfile::modewrite); File.                Write (Pbuf,nbuflen); File.                Close ();            ret = true;       } } catch (...) {break;//}}    while (0);        Release Cache if (PBuf) {free (PBUF);        Pbuf=null;    Nbuflen = 0;        }//Close download connection if (cFile) {cfile->close ();        Sess.close ();    Delete CFile; } return ret;}    int main () {downloadsavefiles ("Http://www.nirsoft.net/utils/nircmd.zip", "D:\\cppdld_nircmd.zip"); return 0;}

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"Go" C + + http download file