IntPtr IBindStatusCallback.OnStopBinding(IntPtr hresult, string szError)
{
// Give a callback async way to avoid failures connected to the fact that
// while being in the method the browser may be still "busy" and therefore not ready for next navigation.
PostCompletionCallback(HResults.Equals(hresult, HResults.S_OK), szError);
return(HResults.S_OK);
}
IntPtr IBindStatusCallback.OnDataAvailable(uint grfBSCF, uint dwSize, ref FORMATETC pformatetc, ref STGMEDIUM pstgmed)
{
if (pstgmed.tymed != TYMED.TYMED_ISTREAM)
{
throw new InvalidOperationException("This callback handler only supports IStreams.");
}
// assume an IStream has been requested in BindMonikerToObject
IStream stream = (IStream)Marshal.GetObjectForIUnknown(pstgmed.unionmember);
IntPtr hresult;
bool shouldContinue = true;
do
{
byte[] buffer = new byte[bufferSize];
IntPtr pBytesRead = Marshal.AllocHGlobal(sizeof(uint));
hresult = stream.Read(buffer, buffer.Length, pBytesRead);
uint bytesRead = (uint)Marshal.PtrToStructure(pBytesRead, typeof(uint));
Marshal.FreeHGlobal(pBytesRead);
if (bytesRead > 0)
{
shouldContinue = viewEvents.OnDataAvailable(buffer, (int)bytesRead);
}
//if (HResults.Equals(hresult, HResults.E_PENDING))
//{
// Thread.Sleep(1000);
// hresult = HResults.S_OK;
//}
} while (shouldContinue && HResults.Succeeded(hresult) && !HResults.Equals(hresult, HResults.S_FALSE));
Marshal.ReleaseComObject(stream);
if (!shouldContinue)
{
Abort();
}
if (!HResults.Succeeded(hresult))
{
return(hresult);
}
return(HResults.S_OK);
}
private void RegisterCallback(IBindCtx pbc, Uri monikerUri)
{
var callback = new BindStatusCallback(monikerUri, owner);
IBindStatusCallback previous;
IntPtr result = RegisterBindStatusCallback(pbc, callback, out previous, 0);
// The call to RegisterBindStatusCallback will fail if the default calback "_BSCB_Holder_" is registered.
// Remove it and try again. (This trick has been taken from
// <http://www.codeproject.com/KB/atl/vbmhwb.aspx?fid=180355&df=90&mpp=25&noise=3&sort=Position&view=Quick&select=2211230>.)
if (HResults.Equals(result, HResults.E_FAIL) && previous != null)
{
pbc.RevokeObjectParam("_BSCB_Holder_");
callback.PreviousCallback = previous;
result = RegisterBindStatusCallback(pbc, callback, out previous, 0);
}
if (!HResults.Equals(result, HResults.S_OK))
{
throw new InvalidOperationException("Could not register custom bind status callback.");
}
}