public CameraSnapshotInstance(CameraSnapshotDefinition theDefinition, TestExecution testExecution) : base(theDefinition, testExecution)
{
mCameraSnapshotDefintion = theDefinition;
if (theDefinition.Camera == null)
{
throw new ArgumentException("'" + theDefinition.Name + "' doesn't have a camera assigned");
}
mCamera = theDefinition.Camera;
if (theDefinition.Camera == null)
{
throw new ArgumentException("'" + theDefinition.Name + "' doesn't have a value assigned to Timeout");
}
mTimeout = theDefinition.Timeout;
mSnapshotImage = new GeneratedImageInstance(theDefinition.ResultantImage, testExecution);
mResolution = theDefinition.Resolution;
testExecution.RegisterTrigger(this);
}
protected override void OnDoWork(DoWorkEventArgs e)
{
mHttpCameraUser.mWorkerLogMessage = "snapshot worker kicked off"; mHttpCameraUser.mWorkerLogMessageAvailable = true;
CameraSnapshotDefinition defObject = (CameraSnapshotDefinition)mHttpCameraUser.Definition();
int readSize = 1024 * 1;//zxz
int bufferSize = defObject.bufferSize;
byte[] buffer = defObject.bufferForWorker;
HttpWebRequest request = null;
WebResponse response = null;
Stream stream = null;
Random randomNumberGenerator = new Random((int)DateTime.Now.Ticks);
HttpRequestCachePolicy bypassCachePolicy = new HttpRequestCachePolicy(HttpRequestCacheLevel.BypassCache);
try
{
string uri = mHttpCameraUser.Camera.CompleteImageRequestURL(defObject.Resolution);
if (mHttpCameraUser.Camera.ProxyCacheProtection)
{
uri += ((uri.IndexOf('?') == -1) ? '?' : '&') + "proxyprevention=" + randomNumberGenerator.Next().ToString();
}
request = (HttpWebRequest)WebRequest.Create(uri);
request.CachePolicy = bypassCachePolicy;
request.Timeout = mHttpCameraUser.Timeout;
if (mHttpCameraUser.Camera.Login != null && mHttpCameraUser.Camera.Login.Length > 0)
{
if (mHttpCameraUser.Camera.Password == null)
{
mHttpCameraUser.Camera.Password = String.Empty;
}
request.Credentials = new NetworkCredential(mHttpCameraUser.Camera.Login, mHttpCameraUser.Camera.Password);
}
// setting ConnectionGroupName to make sure we don't run out of connections amongst all the cameras (see http://msdn2.microsoft.com/en-us/library/ms998562.aspx section: "Connections")
request.ConnectionGroupName = mHttpCameraUser.TestSequence().Name + " : " + mHttpCameraUser.Name; // a unique group for each HTTP user within each TestSequence. We don't want to create unique groups every request because that would be inefficient
// TODO: check maxconnection attribute in Machine.config (limits the number of concurrent outbound calls)
mHttpCameraUser.mWorkerLogMessage = "snapshot request setup"; mHttpCameraUser.mWorkerLogMessageAvailable = true;
response = request.GetResponse();
stream = response.GetResponseStream();
long contentLength = response.ContentLength;
int bytesRead = 0;
int totalBytesRead = 0;
ReportProgress(0, "Requesting image");
bool done = false;
while (!done)
{
if (CancellationPending)
{
e.Cancel = true;
return;
}
if (totalBytesRead > bufferSize - readSize)
{
e.Result = ResultCodes.BufferTooSmall;
return;
}
bytesRead = stream.Read(buffer, totalBytesRead, readSize);
//Console.WriteLine("Read " + bytesRead + " bytes in one chunk");
if (bytesRead == 0)
{
done = true;
}
else
{
totalBytesRead += bytesRead;
ReportProgress((int)(totalBytesRead * 100 / contentLength), "Downloading...");
}
}
mImage = (Bitmap)Bitmap.FromStream(new MemoryStream(buffer, 0, totalBytesRead));
e.Result = ResultCodes.Success;
ReportProgress(100, "Done! Read " + totalBytesRead + " bytes");
//Console.WriteLine("Read total of " + totalBytesRead + " bytes");
}
catch (WebException exception)
{
Console.WriteLine("web exception: " + exception.Message);
switch (exception.Status)
{
// http://msdn2.microsoft.com/en-us/library/system.net.webexceptionstatus(vs.80).aspx
case WebExceptionStatus.Timeout:
e.Result = ResultCodes.Timeout;
break;
default:
e.Result = ResultCodes.Unspecified;
break;
}
}
catch (Exception exception)
{
e.Result = ResultCodes.NonWebException;
}
finally
{
if (request != null)
{
request.Abort();
request = null;
}
if (stream != null)
{
stream.Close();
stream = null;
}
if (response != null)
{
response.Close();
response = null;
}
}
}
