private void Startup( )
{
EndInvoke(_ar);
_pbProgress.Visible = _fileName != null;
Application.DoEvents();
_canceled = false;
WebResponse response = null;
FileStream fs = null;
Stream strm = null;
try
{
WebRequest request;
int length;
if (_url != null)
{
request = WebRequest.Create(_url);
if (request.Proxy != null)
{
request.Proxy.Credentials = CredentialCache.DefaultCredentials;
}
// reduce the timeout to 20sec
request.Timeout = 20000;
// you cannot cancel during GetResponse()
_btnCancel.Enabled = false;
response = request.GetResponse();
_btnCancel.Enabled = true;
strm = response.GetResponseStream();
length = -1;
}
else
{
fs = File.OpenRead(_fileName);
length = (int)fs.Length;
strm = fs;
_pbProgress.Maximum = length;
}
const int bufferSize = 1024;
byte[] buffer = new byte[bufferSize];
int read;
int count = 0;
_codecs.StartFeedLoad(0, CodecsLoadByteOrder.BgrOrGray);
do
{
Application.DoEvents();
if (!_canceled)
{
read = strm.Read(buffer, 0, bufferSize);
if (read > 0)
{
Application.DoEvents();
if (!_canceled)
{
_codecs.FeedLoad(buffer, 0, read);
}
count += read;
}
}
else
{
read = 0;
}
if (!_canceled)
{
if (_url != null)
{
_lblProgress.Text = string.Format("Downloading {0} bytes", count);
}
else
{
_lblProgress.Text = string.Format("Loading {0} of {1} bytes", count, length);
_pbProgress.Value = count;
}
}
}while(read > 0 && !_canceled);
if (!_canceled)
{
Image = _codecs.StopFeedLoad();
Close(DialogResult.OK);
}
else
{
_codecs.CancelFeedLoad();
Image = null;
Close(DialogResult.Cancel);
}
}
catch (Exception ex)
{
Messager.ShowError(this, ex);
Close(DialogResult.Cancel);
}
finally
{
if (strm != null)
{
strm.Close();
}
if (response != null)
{
response.Close();
}
if (fs != null)
{
fs.Close();
}
}
}