有关http下载的问题

Question

请问如何在VC中实现HTTP下载,无需弹出选择下载路径对话框,在程序中制定下载目录即可

Answer 1

bool SaveUrl(LPCTSTR url, LPCTSTR filename)
{
HINTERNET hNet = ::InternetOpen("Outlook",
PRE_CONFIG_INTERNET_ACCESS,
NULL,
INTERNET_INVALID_PORT_NUMBER,
0) ; HINTERNET hUrlFile = ::InternetOpenUrl(hNet,
url,
NULL,
0,
INTERNET_FLAG_RELOAD,
0) ; char buffer[10*1024] ;
DWORD dwBytesRead = 1;
BOOL bRead=TRUE;
CFile file;
file.Open(filename,CFile::modeCreate|CFile::modeWrite);
while(bRead&&dwBytesRead>0)
{
bRead = ::InternetReadFile(hUrlFile,
buffer,
sizeof(buffer),
&dwBytesRead);
if(dwBytesRead>0)
file.Write(buffer,dwBytesRead);
}
::InternetCloseHandle(hUrlFile) ;
::InternetCloseHandle(hNet) ;
file.Close();
AfxMessageBox("finished");
return bRead;
}

Answer 2

//Download http file through proxy
//--------------------------------------------------------------------------------
We can find details about Proxy Authentication and Sever Authentication methed in MSDN.
Just search for the keyword "INTERNET_OPTION_USERNAME".
Here I give a very simple example. It works in my project.
CString GeHttptFile(const char *url)
{
CString szContent;
char strProxyList[MAX_PATH], strUsername[64], strPassword[64];
//in this case "proxya" is the proxy server name, "8080" is its port
strcpy(strProxyList, "proxya:8080");
strcpy(strUsername, "myusername");
strcpy(strPassword, "mypassword");
DWORD dwServiceType = AFX_INET_SERVICE_HTTP;
CString szServer, szObject;
INTERNET_PORT nPort;
AfxParseURL(url, dwServiceType, szServer, szObject, nPort);
CInternetSession mysession;
CHttpConnection* pConnection;
CHttpFile* pHttpFile;
pConnection = mysession.GetHttpConnection(szServer,
INTERNET_FLAG_KEEP_CONNECTION,
INTERNET_INVALID_PORT_NUMBER,
NULL, NULL);
pHttpFile = pConnection->OpenRequest("GET", szObject,
 NULL, 0, NULL, NULL,
 INTERNET_FLAG_KEEP_CONNECTION);
//here for proxy
INTERNET_PROXY_INFO proxyinfo;
proxyinfo.dwAccessType = INTERNET_OPEN_TYPE_PROXY;
proxyinfo.lpszProxy = strProxyList;
proxyinfo.lpszProxyBypass = NULL;
mysession.SetOption(INTERNET_OPTION_PROXY, (LPVOID)&proxyinfo, sizeof(INTERNET_PROXY_INFO));
pHttpFile->SetOption(INTERNET_OPTION_PROXY_USERNAME, strUsername, strlen(strUsername)+1);
pHttpFile->SetOption(INTERNET_OPTION_PROXY_PASSWORD, strPassword, strlen(strPassword)+1); pHttpFile->SendRequest(NULL);
DWORD nFileSize = pHttpFile->GetLength();
LPSTR rbuf = szContent.GetBuffer(nFileSize);
UINT uBytesRead = pHttpFile->Read(rbuf, nFileSize);
szContent.ReleaseBuffer();
pHttpFile->Close();
delete pHttpFile;
pConnection->Close();
delete pConnection;
mysession.Close();
return szContent;
}

Answer 3

http://www.codeguru.com/ieprogram/SaveWholePage.html

Answer 4

非常感谢,第一段代码正是我所要的
但是链接时为什么链接不到internetopen,internetclosehandle等5个函数?