private Stream WriteResponseToCache(Stream responseStream)
{
StringBuilder fileNameBuffer = new StringBuilder(Kernel32.MAX_PATH * 2);
bool created = WinInet.CreateUrlCacheEntry(
_requestUrl, 0, UrlHelper.GetExtensionForUrl(_requestUrl), fileNameBuffer, 0);
if (created)
{
// copy the stream to the file
string cacheFileName = fileNameBuffer.ToString();
using (FileStream cacheFile = new FileStream(cacheFileName, FileMode.Create))
StreamHelper.Transfer(responseStream, cacheFile);
// commit the file to the cache
System.Runtime.InteropServices.ComTypes.FILETIME zeroFiletime = new System.Runtime.InteropServices.ComTypes.FILETIME();
bool committed = WinInet.CommitUrlCacheEntry(
_requestUrl, cacheFileName, zeroFiletime, zeroFiletime, CACHE_ENTRY.NORMAL, IntPtr.Zero, 0, IntPtr.Zero, IntPtr.Zero);
Trace.Assert(committed);
// return a stream to the file
return(new FileStream(cacheFileName, FileMode.Open));
}
else
{
Trace.Fail("Unexpedcted failure to create cache entry for url " + _requestUrl + ": " + Marshal.GetLastWin32Error().ToString(CultureInfo.InvariantCulture));
return(responseStream);
}
}