I know how to download an html/txt page. For example :
//Variables
DWORD dwSize = 0;
DWORD dwDownloaded = 0;
LPSTR pszOutBuffer;
vector <string> vFileContent;
BOOL bResults = FALSE;
HINTERNET hSession = NULL,
hConnect = NULL,
hRequest = NULL;
// Use WinHttpOpen to obtain a session handle.
hSession = WinHttpOpen( L"WinHTTP Example/1.0",
WINHTTP_ACCESS_TYPE_DEFAULT_PROXY,
WINHTTP_NO_PROXY_NAME,
WINHTTP_NO_PROXY_BYPASS, 0);
// Specify an HTTP server.
if (hSession)
hConnect = WinHttpConnect( hSession, L"nytimes.com",
INTERNET_DEFAULT_HTTP_PORT, 0);
// Create an HTTP request handle.
if (hConnect)
hRequest = WinHttpOpenRequest( hConnect, L"GET", L"/ref/multimedia/podcasts.html",
NULL, WINHTTP_NO_REFERER,
NULL,
NULL);
// Send a request.
if (hRequest)
bResults = WinHttpSendRequest( hRequest,
WINHTTP_NO_ADDITIONAL_HEADERS,
0, WINHTTP_NO_REQUEST_DATA, 0,
0, 0);
// End the request.
if (bResults)
bResults = WinHttpReceiveResponse( hRequest, NULL);
// Keep checking for data until there is nothing left.
if (bResults)
do
{
// Check for available data.
dwSize = 0;
if (!WinHttpQueryDataAvailable( hRequest, &dwSize))
printf( "Error %u in WinHttpQueryDataAvailable.\n",
GetLastError());
// Allocate space for the buffer.
pszOutBuffer = new char[dwSize+1];
if (!pszOutBuffer)
{
printf("Out of memory\n");
dwSize=0;
}
else
{
// Read the Data.
ZeroMemory(pszOutBuffer, dwSize+1);
if (!WinHttpReadData( hRequest, (LPVOID)pszOutBuffer,
dwSize, &dwDownloaded))
{
printf( "Error %u in WinHttpReadData.\n",
GetLastError());
}
else
{
printf("%s", pszOutBuffer);
// Data in vFileContent
vFileContent.push_back(pszOutBuffer);
}
// Free the memory allocated to the buffer.
delete [] pszOutBuffer;
}
} while (dwSize>0);
// Report any errors.
if (!bResults)
printf("Error %d has occurred.\n",GetLastError());
// Close any open handles.
if (hRequest) WinHttpCloseHandle(hRequest);
if (hConnect) WinHttpCloseHandle(hConnect);
if (hSession) WinHttpCloseHandle(hSession);
// Write vFileContent to file
ofstream out("test.txt",ios::binary);
for (int i = 0; i < (int) vFileContent.size();i++)
out << vFileContent[i];
out.close();
When I try to download a picture, I get only the first lines of the file and no error message. The problem seems related to this parameter (ppwszAcceptTypes) in WinHttpOpenRequest Function.
Merely opening the ofstream in binary mode does not change the way that the << operators work - they will always perfform formatted output. You need to use the stream's write() function, which does unformatted output.