HTTP SSL example

[sapero]

SSL
  (Secure Sockets Layer) A protocol that provides for encrypted communications on the Internet. SSL runs in a layer above TCP/IP and below HTTP, NNTP, and SMTP.

Code Select Expand

#include "windows.inc"
#include "winhttp.inc"
#include "wchar.inc"

// SSL (Secure Sockets Layer) example
// compile for console

sub main()
{
HINTERNET hOpen = 0;
HINTERNET hConnect = 0;
HINTERNET hRequest = 0;
IStream *stream = NULL;
HRESULT hr;

while (1)
{
hOpen = WinHttpOpen(L"Aurora Console App", WINHTTP_ACCESS_TYPE_DEFAULT_PROXY,
WINHTTP_NO_PROXY_NAME, WINHTTP_NO_PROXY_BYPASS, 0);

if (!hOpen) {
wprintf(L"WinHttpOpen failed (0x%.8X)\n", GetLastError());
break;
}

hConnect = WinHttpConnect(hOpen, L"www.codeproject.com", INTERNET_DEFAULT_HTTPS_PORT, 0);

if (!hConnect) {
wprintf(L"WinHttpConnect failed (0x%.8X)\n", GetLastError());
break;
}

LPCWSTR types[2];
types[0] = L"text/html";
types[1] = 0;

// use flag WINHTTP_FLAG_SECURE to initiate SSL
hRequest = WinHttpOpenRequest(hConnect, L"GET", L"KB/IP/NagTPortScanner.aspx",
NULL, WINHTTP_NO_REFERER, &types, WINHTTP_FLAG_SECURE);

if (!hRequest)
{
wprintf(L"WinHttpOpenRequest failed (0x%.8X)\n", GetLastError());
break;
}

if (!WinHttpSendRequest(hRequest, WINHTTP_NO_ADDITIONAL_HEADERS, 0, WINHTTP_NO_REQUEST_DATA, 0, 0, 0))
{
wprintf(L"WinHttpSendRequest failed (0x%.8X)\n", GetLastError());
break;
}
if (!WinHttpReceiveResponse(hRequest, 0))
{
wprintf(L"WinHttpReceiveResponse failed (0x%.8X)\n", GetLastError());
break;
}
// query remote file size, set haveContentLength on success and dwContentLength to the length
dwstring szContentLength[32];
DWORD cch = 64;
DWORD dwHeaderIndex = WINHTTP_NO_HEADER_INDEX;

BOOL haveContentLength = WinHttpQueryHeaders(hRequest, WINHTTP_QUERY_CONTENT_LENGTH, NULL,
&szContentLength, &cch, &dwHeaderIndex);

DWORD dwContentLength;
if (haveContentLength) dwContentLength = _wtoi(szContentLength);

// read the response into memory stream
hr = CreateStreamOnHGlobal(0, true, &stream);
if (hr) {
wprintf(L"CreateStreamOnHGlobal failed (0x%.8X)\n", hr);
break;
}
// allocate buffer for streaming received data
string *p = new(byte, 4096);
if (!p)
{
wprintf(L"failed to allocate buffer\n");
break;
}
// to receive all data, we need to enter a loop
DWORD dwReceivedTotal = 0;
while (WinHttpQueryDataAvailable(hRequest, &cch) && cch)
{
if (cch > 4096) cch = 4096;
dwReceivedTotal += cch;

// display number of received bytes
if (haveContentLength)
{
wprintf(L"received %d of %d (%d%%)%c", dwReceivedTotal, dwContentLength,
dwReceivedTotal*100/dwContentLength, 13);
}
else {
wprintf(L"received %d (unknown length)%c", dwReceivedTotal, 10);
}

WinHttpReadData(hRequest, p, cch, &cch);
// write into stream
hr = stream->Write(p, cch, NULL);
if (hr)
{
wprintf(L"failed to write data to stream (0x%.8X)\n", hr);
}
}

delete p;
wprintf(L"\n\nreceived all data.\n");
// terminate the sream with a NULL
p = NULL;
stream->Write(&p, 1, NULL);
// get pointer to stream bytes
wprintf(L"getting HGLOBAL from stream...\n");
HGLOBAL hgl;
hr = GetHGlobalFromStream(stream, &hgl);
if (hr) {
wprintf(L"GetHGlobalFromStream failed (0x%.8X)\n", hr);
break;
}
wprintf(L"locking memory...\n");
p = GlobalLock(hgl);
if (!p)
{
wprintf(L"GlobalLock failed (0x%.8X)\n", GetLastError());
break;
}
wprintf(L"displaying received data...\n");
// terminate the string at 1024 bytes (MessageBox lag)
//if (dwReceivedTotal > 1024) dwReceivedTotal = 1024;
//*p[dwReceivedTotal] = 0;

MessageBox(0, *p, "", 0);
GlobalUnlock(hgl);

break;
}
// delete stream and close handles
if (stream) stream->Release();
if (hRequest) WinHttpCloseHandle(hRequest);
if (hConnect) WinHttpCloseHandle(hConnect);
if (hOpen) WinHttpCloseHandle(hOpen);
system("pause");
}