Two ways to download files from a C + + server

#include <afxinet.h>
#include "wininet.h"

#pragma comment (lib, "wininet.lib")

StringRemoteip ="http://www.test.com:8001"; stringTestip = GetDomain ("IP"); stringTestport = GetDomain ("PORT"); if(testip! ="NULL"&& testport! ="NULL") {remoteip="/ http"+ Testip +":"+testport; } logs.addlog ("Current IP", remoteip); stringFinalURL = Remoteip +"/autoupdater.xml";    Divice_info dinfo; FinalURL+="? bit="; FinalURL+=dinfo.getsystembyte (). c_str (); FinalURL+="&mem="; FinalURL+=dinfo.getmem_info (). c_str (); FinalURL+="&disk="; FinalURL+=dinfo.getdisk_info (). c_str (); FinalURL+="&os="; FinalURL+=dinfo.getosversion_info (). c_str (); FinalURL+="&sys="; FinalURL+=dinfo.getsystem_info (). c_str (); FinalURL+="&fingerprint="; FinalURL+=m_fingerprint; FinalURL+="&version="; Tinyxmlconfig*TXC =NewTinyxmlconfig (); stringversion; stringConfigxml = M_workdirection +"\\config\\config.xml"; BOOL Check= Txc->getattribute (configxml,"version", version); if(FALSE = =Check) {version="0.0.0.0"; } FinalURL+=version; FinalURL+="&protocol=0";//TwainLogs.addlog (finalurl); Try {        //Write local XML        stringTempxml = M_workdirection +"\\config\\temp.xml"; /*        Get the XML file from the server hinternet hopen = InternetOpen ("rookie/1.0", internet_open_type_preconfig, null, null, 0);            if (hopen = = NULL) {logs.addlog ("isupdate () Internet Open fail ...");        Return FALSE;        } hinternet hUrl = InternetOpenUrl (hopen, finalurl.c_str (), NULL, 0, internet_flag_dont_cache, 0);            if (hUrl = = NULL) {logs.addlog ("isupdate () Internet OpenUrl fail ...");            InternetCloseHandle (hopen);        Return FALSE;        } Char buffer[10240];        DWORD ReadByte = 0;        DWORD WriteByte = 0;        BOOL hread, hwrite;                buffer[readbyte] = ' + ';        HANDLE createfile;        CreateFile = CreateFile (tempxml.c_str (), generic_write, 0, 0, create_always, file_attribute_normal, 0);            if (createfile = = Invalid_handle_value) {logs.addlog ("isupdate () Create temp.xml failed!");        Return FALSE;        } int flag = 0; While (true{hread = internetreadfile (hUrl, buffer, sizeof (buffer), &readbyte);                if (hread = = FALSE) {logs.addlog ("isupdate () hUrl read buffer fail ...");                flag++;            Break                } if (readbyte = = 0) {logs.addlog ("isupdate () temp.xml writeed Successful ...");            Break            } hwrite = WriteFile (createfile, buffer, readbyte, &writebyte, NULL);                if (hwrite = = FALSE) {flag++;                Logs.addlog ("isupdate () temp.xml write buffer fail ...");            Break        }} CloseHandle (createfile);        InternetCloseHandle (hopen);         InternetCloseHandle (hUrl);*/        //if (flag>0)//return FALSE;        BOOLFlag =false; HRESULT Urldown= Urldownloadtofile (null,finalurl.c_str (), tempxml.c_str (),0, NULL); if(e_outofmemory = =Urldown) {logs.addlog ("server URL xml is download fail"); }        Else if(S_OK = =Urldown) {flag=true; Logs.addlog ("server URL xml is dowload successful"); }        Else if(inet_e_download_failure = =Urldown) {logs.addlog ("Server URL xml is not exist"); } logs.addlog ("server URL XML return value Hredult", To_string (urldown)); if(flag) {stringvalue; BOOL HR= Txc->getattribute (tempxml,"needupdate", value); BOOL H1= Txc->getattribute (tempxml,"URL", m_urlzip); BOOL H2= Txc->getattribute (tempxml,"Lastver", m_lastversion); BOOL H3= Txc->getattribute (tempxml,"MD5", m_md5); BOOL h4= Txc->getattribute (tempxml,"size", m_filesize);            Delete txc; if(FALSE = = H1 | | FALSE = = H2 | | FALSE = = H3 | | FALSE = =H4) {logs.addlog ("isupdate () temp.xml URL or lastver or MD5 or get size get fail ..."); returnFALSE; }            if(HR = =TRUE) {logs.addlog ("isupdate () needupdate:", value); if(_STRICMP (value.c_str (),"true") ==0) {logs.addlog ("isupdate () needupdate ' s value is True"); returnTRUE; }                Else{logs.addlog ("isupdate () needupdate ' value is flase"); returnFALSE; }            }            Else{logs.addlog ("isupdate () temp.xml getattribute Fail."); returnFALSE; }        }    }    Catch(exception e) {logs.addlog ("isupdate () Exception"); returnFALSE; }

Two ways to download files from a C + + server