需要包含的头文件和库文件
#include <string>
#include <Wininet.h>
#include <fstream>
#pragma comment(lib,"Wininet.lib")
1.打开服务器
int CHTTP::CreateConnect(const string & HTTPServer,const string & UserName,const string &Password,const int nPort)
{
DWORD err;
m_Session = NULL;
m_Connect = NULL;
HINTERNET m_Session = InternetOpen(L"AGENT",INTERNET_OPEN_TYPE_PRECONFIG,NULL,NULL,0);
if(m_Session ！= NULL)
{
if (HTTPServer.find("www")!=string::npos)
{
m_Connect = InternetConnectA(m_Session, HTTPServer.c_str(),nPort,UserName.c_str(),Password.c_str(), INTERNET_SERVICE_HTTP,0,0);
}
else
{
m_Connect = InternetConnectA(m_Session, HTTPServer.c_str(),INTERNET_DEFAULT_HTTP_PORT,UserName.c_str(),Password.c_str(), INTERNET_SERVICE_HTTP,0,0);
}
}
if(m_Connect == NULL)
{
err = GetLastError();
return OP_FAIL;
}
return OP_SUCCESS;
}
2.下载文件
int CHTTP::DownloadFile(const wstring & RemoteFileName,const wstring & LocalPath,const wstring & LocalFileName)
{
if(m_Connect == NULL)
{
return OP_FAIL;
}
HINTERNET m_WebSite = HttpOpenRequest(m_Connect,L"GET",RemoteFileName.c_str(),HTTP_VERSION,NULL,0,INTERNET_FLAG_DONT_CACHE|INTERNET_FLAG_RELOAD,0);
if(m_WebSite == NULL)
{
DWORD err = GetLastError();
return OP_FAIL;
}
BOOL bSendRequest=::HttpSendRequest(m_WebSite,NULL,0,0,0);
wchar_t achQueryBuf[1024];
DWORD dwQueryBufLen = sizeof(achQueryBuf);
BOOL bQuery=::HttpQueryInfo(m_WebSite,HTTP_QUERY_STATUS_CODE,achQueryBuf,&dwQueryBufLen,NULL);
wstring str = achQueryBuf;
if (m_pInitStruct != NULL)
{
wchar_t QueryBuf[1024];
DWORD QueryBufLen = sizeof(QueryBuf);
BOOL bLQuery=::HttpQueryInfo(m_WebSite,HTTP_QUERY_CONTENT_LENGTH,QueryBuf,&QueryBufLen,NULL);
wstring Buff = QueryBuf;
int length = _wtoi(Buff.c_str());
}
if(!bQuery)
{
return OP_FAIL;
}
if(str == L"200" || str == L"302")
{
//临时文件名
wstring TempFile = LocalPath+L\\package.tmp;
DeleteFile(TempFile.c_str());
FILE *fp_File = NULL;
DWORD err = _wfopen_s(&fp_File,TempFile.c_str(), L"wb");
DWORD Number = 1;
DWORD MAXBLOCKSIZE = 512;
char Temp[512];
while(Number)
{
memset(Temp,0,512);
if (!InternetReadFile(m_WebSite,Temp,MAXBLOCKSIZE-1,&Number))
{
fclose(fp_File);
return OP_FAIL;
}
fwrite(Temp, sizeof(char), Number, fp_File);
}
fclose(fp_File);
//重命名为目标文件
wstring DesFile = LocalPath;
DeleteFile(DesFile.c_str());
::MoveFile(TempFile.c_str(),DesFile.c_str());
return OP_SUCCESS;
}
else
{
return OP_FAIL;
}
}
3.关闭服务器
int CHTTP::Close()
{
if(m_WebSite != NULL)
{
InternetCloseHandle(m_WebSite);
}
if(m_Connect != NULL)
{
InternetCloseHandle(m_Connect);
}
if(m_Session != NULL)
{
InternetCloseHandle(m_Session);
}
return OP_SUCCESS;
}