/// <summary> /// This method retreived the HTML of the browser and pass it on to the gelegated function /// </summary> /// <param name="callBack"></param> /// <returns></returns> public abstract bool GetBuffer(GetBufferCallback callBack);
public override bool GetBuffer(GetBufferCallback callBack)
{
this.getBufferCallback = callBack;
if (this.buffer != null && callBack != null)
{
callBack(this.buffer);
return(true);
}
if (this.m_pIWebBrowser2 == null)
{
SetState(BrowserStatus.Error);
isRefreshingForBuffer = false;
return(false);
}
IHTMLDocument2 document = this.m_pIWebBrowser2.Document as IHTMLDocument2;
if (document == null)
{
SetState(BrowserStatus.Error);
isRefreshingForBuffer = false;
return(false);
}
IPersistStreamInit ips = document as IPersistStreamInit;
if (ips == null)
{
SetState(BrowserStatus.Error);
isRefreshingForBuffer = false;
return(false);
}
try
{
IStream istream;
CreateStreamOnHGlobal(IntPtr.Zero, true, out istream);
if (istream == null)
{
SetState(BrowserStatus.Error);
isRefreshingForBuffer = false;
return(false);
}
int cb;
unsafe
{
int hr = ips.Save(istream, false);
if (hr != HRESULT.S_OK)
{
Marshal.ThrowExceptionForHR(hr);
SetState(BrowserStatus.Error);
return(false);
}
istream.Seek(0, 0, IntPtr.Zero);
byte[] buffer = new byte[1024];
StringBuilder sb = new StringBuilder();
int * pcb = &cb;
IntPtr readOffset = new IntPtr(pcb);
do
{
istream.Read(buffer, 1024, readOffset);
sb.Append(System.Text.ASCIIEncoding.UTF8.GetString(buffer, 0, cb));
} while (cb > 0);
istream = null;
ips = null;
if (sb.Length <= 0)
{
SetState(BrowserStatus.Error);
isRefreshingForBuffer = false;
return(false);
}
isRefreshingForBuffer = false;
this.buffer = sb.ToString();
}
}
catch (Exception e)
{
// workaround a bug on IE
// when there's a "no-cache" http header
// the HTML Source is invisible, so to fix it,
// we need to refresh the page..
if (e is FileNotFoundException)
{
// Call refresh unless called before...
if (isRefreshingForBuffer || m_pIWebBrowser2 == null)
{
SetState(BrowserStatus.Error);
return(false);
}
isRefreshingForBuffer = true;
SetState(BrowserStatus.Processing);
m_pIWebBrowser2.Refresh();
return(true);
}
else
{
SetState(BrowserStatus.Error);
return(false);
}
}
if (callBack != null)
{
callBack(this.buffer);
}
return(true);
}
