Using CHttpFile with HTTPS sites - https

Question

I have this code that I use to read a data file from my website:
CInternetSession iSession;
CHttpFile *pWebFile = nullptr;
DWORD dwStatusCode;
CString strError, strTargetZIP, strDownloadURL;
strTargetZIP = theApp.GetWorkingPath() + _T("AutoUpdate\\MWBDataUpdate.zip");
strDownloadURL = _T("http://www.publictalksoftware.co.uk/mwbdata/MWBDataUpdate.zip");
// ask user to go online
if (InternetGoOnline((LPTSTR)(LPCTSTR)strDownloadURL, hWnd, 0))
{
TRY
{
// our session should already be open
// try to open up internet session to my URL
// Use flag INTERNET_FLAG_RELOAD
pWebFile = (CHttpFile*)iSession.OpenURL(strDownloadURL, 1,
INTERNET_FLAG_TRANSFER_BINARY | INTERNET_FLAG_DONT_CACHE | INTERNET_FLAG_RELOAD);
if (pWebFile != nullptr)
{
if (pWebFile->QueryInfoStatusCode(dwStatusCode))
{
// 20x codes mean success
if ((dwStatusCode / 100) == 2)
{
}
else
{
// There was a problem!
strError.Format(IDS_TPL_INVALID_URL, dwStatusCode);
AfxMessageBox(strError, MB_OK | MB_ICONERROR);
}
}
}
else
{
// Note, there is no error log. Use new error message?
AfxMessageBox(IDS_STR_UPDATE_CHECK_ERR, MB_OK | MB_ICONERROR);
}
}
CATCH(CException, e)
{
e->GetErrorMessage(szError, _MAX_PATH);
AfxMessageBox(szError, MB_OK | MB_ICONERROR);
}
END_CATCH
// Tidy up
if (pWebFile != nullptr)
{
pWebFile->Close();
delete pWebFile;
}
iSession.Close();
}
I have recently changed my site to use HTTPS and I am trying to find if all I need to do is just change the URL here in my code. I have looked up the latest documentation for CHttpFile and it only mentions HTTP.
Thanks for the clarification.

Answer 1

CInternetSession::OpenURL calls InternetOpenUrl API. InternetOpenUrl needs INTERNET_FLAG_SECURE for secure websites.
Change the url from http:// to https://
Add INTERNET_FLAG_SECURE to OpenURL's option.
Example:
CInternetSession isession;
CString url = _T("https://www.google.com");
CString filename = _T("c:\\test\\test.html");
CHttpFile *httpfile = (CHttpFile*)isession.OpenURL(url, 1, INTERNET_FLAG_SECURE |
INTERNET_FLAG_TRANSFER_BINARY | INTERNET_FLAG_RELOAD);
if (httpfile)
{
DWORD dwStatusCode;
httpfile->QueryInfoStatusCode(dwStatusCode);
if(dwStatusCode == 200)
{
char buf[0x1000] = { 0 };
DWORD read = 0;
CFile file;
if (file.Open(filename, CFile::modeCreate | CFile::modeWrite))
while(InternetReadFile(*httpfile, buf, sizeof(buf), &read) && read)
file.Write(buf, read);
}
httpfile->Close();
delete httpfile;
}