I checked out many places for the answer but couldn't get one. According to this page the API should be available. But, when I run the codes on RaspberryPi 2, I get Unhandled Exception Error. To ensure that my codes are correct I ran the codes on my local machine, it runs perfectly fine.
Windows.Media.Ocr is universal API, so it is available.
With RaspberryPy there are no any language resources installed on device.
On such device, if you try code like following, ocrEngine will be null.
var ocrEngine = OcrEngine.TryCreateFromLanguage(new Language("en"));
You can check for available language recognizers with OcrEngine.AvailableRecognizerLanguages property.
Related
I've got a Windows Store app that's a WinRT Phone/Desktop app (i.e. not a UWP app), targeting Windows 8.1 and up.
It's been on the store for several years now, but recently it stopped being able to connect with various web APIs and websites (YouTube, as well as my own site) using HTTPS.
I have a WPF version of this app as well, and this happened on that app recently as well, and to fix it I used System.Net.ServicePointManager. Unfortunately, in my WinRT environment, System.Net doesn't include ServicePointManager. In my WPF app, I did this, and it worked just fine:
ServicePointManager.ServerCertificateValidationCallback = delegate
{
Debug.WriteLine("returning true (the ssl is valid)");
return true;
};
// our server is using TLS 1.2
ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;
In doing some research around the internet, it seems that .NET 4.6 should include ServicePointManager, but I don't see any way to change (or even see) my version of .NET in the WinRT development environment.
I looked some more and found that a StreamSocket could be used to connect with TLS1.2... but that seems primarily designed to enable bluetooth communications, or communications to a web endpoint, but only by hostname... which is insufficient for me. I need to connect to an actual website, not just the base-level domain.
Trying this, I did the following:
StreamSocket socket = new StreamSocket();
string serverServiceName = "https";
socket.Control.KeepAlive = false;
url = "inadaydevelopment.com";
HostName serverHost = new HostName(url);
await socket.ConnectAsync(serverHost, serverServiceName, SocketProtectionLevel.Tls12);
text = await ReadDataFromSocket(socket);
I can include the code for ReadDataFromSocket() if necessary, but it seems to work, reading the data from the socket as expected when I point it at https://google.com. However, I can't seem to figure out how to point the socket at anything useful. The homepage of inadaydevelopment.com isn't what I want; I'm looking to consume a web API hosted on that server, but can't seem to find a way to do that.
Since the first parameter to the ConnectAsync() method is just HostName, the second parameter (remoteServiceName) must be the way to connect to the actual API or webpage I'm trying to connect to. According to the docs, that is The service name or TCP port number of the remote network destination... I haven't seen any example values for this parameter other than https and various numeric values, neither of which is going to get me to the API endpoint or webpage I'm trying to connect to.
So, with that super-long preamble out of the way, my question boils down to this:
Is there a way for me to use System.Net.ServicePointManager in my WinRT app like I do in my WPF app? If so, how?
If not, how can I use StreamSocket to connect to the exact web service or webpage I want to connect to, rather than just the top-level host?
If that's not possible, by what other means can I consume web content using TLS1.2?
Thanks in advance for any help or advice.
Use Windows.Web.Http API instead of System.Net.Http API.
System.Net.Http does not support TLS1.2 but Windows.Web.Http does in WinRT apps.
I am doing a lookup operation Couchbase Java SDK 3.0.9 which looks like this:
// Set up
bucket = cluster.bucket("my_bucket")
collection = bucket.defaultCollection()
// Look up operation
val specs = listOf(LookupInSpecStandard.get("hash"))
collection.lookupIn(id, specs)
The error I get is BUCKET_NOT_AVAILABLE. Here are is the full message:
com.couchbase.client.core.error.UnambiguousTimeoutException: SubdocGetRequest, Reason: TIMEOUT {"cancelled":true,"completed":true,"coreId":"0xdb7f8e4800000003","idempotent":true,"reason":"TIMEOUT","requestId":608806,"requestType":"SubdocGetRequest","retried":39,"retryReasons":["BUCKET_NOT_AVAILABLE"],"service":{"bucket":"export","collection":"_default","documentId":"export:main","opaque":"0xcfefb","scope":"_default","type":"kv"},"timeoutMs":15000,"timings":{"totalMicros":15008977}}
The strange part is that this code hasn't been touched for months and the lookup broke out of a sudden. The CB cluster is working fine. Its version is
Enterprise Edition 6.5.1 build 6299.
Do you have any ideas what might have gone wrong?
Note that in Couchbase Java SDK 3.x, the Cluster::bucket method returns instantly, and continues opening a bucket in the background. So the first operation you perform - a lookupIn here - needs to wait for that resource opening to complete before it can proceed. It looks like it took a little longer to access the Couchbase bucket than usual and you got a timeout.
I recommend using the Bucket::waitUntilReady method after opening a bucket, to block until the resource opening is complete:
bucket = cluster.bucket("my_bucket")
bucket.waitUntilReady(Duration.ofMinutes(1));
This problem can occur because of firewall. You need to allow these ports.
Client-to-node
Unencrypted: 8091-8097, 9140 [3], 11210
Encrypted: 11207, 18091-18095, 18096, 18097
You can check more from below
https://docs.couchbase.com/server/current/install/install-ports.html#_footnotedef_2
I'm using the Chrome Web Serial API. So far it's working fine, but now and I'm trying to get the (already opened) port metadata (port name, device ID, etc.) and I'm a bit lost.
Here are the steps to follow:
https://wicg.github.io/serial/#getting-serial-port-metadata
but so far I cannot get the information.
If I try by navigating the port class, the DevTools console trows "ƒ () { [native code] }".
I cannot find a suitable example of how to implement this.
Does anyone have a hint?
Thanks in advance!!
Daniel.
It seems like it hasn't been implemented in Chromium yet. Keep in mind that the specs are sort of guides for vendors to follow when implementing a feature, but the actual shipped implementation can differ.
If you check the Web Serial API's code in the Chromium repo for Chrome 80 (current version at the time of writing) and 84.0.4112.1 you'll see that they only include the following methods:
open
readable
writable
getSignals
setSignals
close
You can read the latest comments on this API here: https://bugs.chromium.org/p/chromium/issues/detail?id=884928
I am trying to change webservice implementation I have done over to use HTTPS.
I have been using the as3httpclientlib (https://code.google.com/p/as3httpclientlib/).
When I use a non-ssl endpoint it works as expected.
However when I use an SSL endpoint and version 1.3 as3crypt from the downloads page (https://code.google.com/p/as3crypto/downloads/list) or the included as3crypto-1_3_patched.swc I get the following:
I DONT KNOW HOW TO HANDLE DER stuff of TYPE 22
I DONT KNOW HOW TO HANDLE DER stuff of TYPE 22
I DONT KNOW HOW TO HANDLE DER stuff of TYPE 22
I DONT KNOW HOW TO HANDLE DER stuff of TYPE 22
I DONT KNOW HOW TO HANDLE DER stuff of TYPE 12
I DONT KNOW HOW TO HANDLE DER stuff of TYPE 22
I DONT KNOW HOW TO HANDLE DER stuff of TYPE 22
I DONT KNOW HOW TO HANDLE DER stuff of TYPE 22
I DONT KNOW HOW TO HANDLE DER stuff of TYPE 22
[Fault] exception, information=TypeError: Error #1009: Cannot access a property or method of a null object reference.
With the traces originating from Line 123 of DER.as
https://code.google.com/p/as3crypto/source/browse/trunk/as3crypto/src/com/hurlant/util/der/DER.as?r=7
and the error from line 225 of X509Certificate.as
https://code.google.com/p/as3crypto/source/browse/trunk/as3crypto/src/com/hurlant/crypto/cert/X509Certificate.as?spec=svn28&r=7
When I use the latest version of as3crypt https://code.google.com/p/as3crypto/source/detail?r=28 I get
[Fault] exception, information=Error: couldn't parse DER stream.
Thrown from line 23 of https://code.google.com/p/as3crypto/source/browse/trunk/as3crypto/src/com/hurlant/util/asn1/type/SetType.as
The webservice I am trying to access is on azurewebsites, so will be using the *.azurewebsites.net certificate.
I am also using the ASC2 compiler, this caused a couple of bugs which I had to fix in the crypto project including changing if (hex.length&1==1) hex="0"+hex; to if ((hex.length&1)==1) hex="0"+hex; which I found posted here com.hurlant.util.hex syntax error on air sdk 3.5
I am starting to think it may be something related to the way SSL is done on Azure websites, since when I strip back the request completely, I still get the same error, however pointing to https://www.google.com, I get no error.
They state on their website:
HTTPS doesn't always work. There are some minor bugs with the
as3crypto library, so for example https at yahoo and yahoo owned
domains (like delicious) don't currently work.
I had a look through the list of issues for as3crypt, and was wondering whether one of these contained a fix: https://code.google.com/p/as3crypto/issues/list
Does anyone know why I am getting these errors (what it is that azure are doing differently with their certificate (could it be the wildcard?)) and how I can fix it? Is there a maintained version of as3crypto that works? Or is there a better way for consuming https webservices from Air mobile apps?
****UPDATE****
I tried using the patched version of as3crypto but still no joy. The following is a copy of my stack trace when it errors. Does seem to be an error parsing the certificate?
I also had a look into changing over to SecureSocket but unfortunately it is not supported on iOS.
http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/net/SecureSocket.html
AIR profile support: This feature is supported on all desktop
operating systems, but is not supported on all AIR for TV devices. On
mobile devices, it is supported on Android, but not on iOS. You can
test for support at run time using the SecureSocket.isSupported
property.
TO RECREATE:
Make a get request to any https subdomain of azurewebsites.net.
ie the following code will reproduce:
var client:HttpClient = new HttpClient();
client.get(new URI("https://httpstest.azurewebsites.net"));
I have the same issue with DER decoing, and fix from this issue helped me:
http://code.google.com/p/as3crypto/issues/detail?id=39
What about:
Or is there a better way for consuming https webservices from Air mobile apps?
You can try to substitute TLSSocket from as3crypto with Flash native SecureSocket in the as3httpclient, I think it shouldn't be too difficult to do. In my project I tryed to use both SecureSoket and TLSSocket and stood on TLSSocket because SecureSoket requires FP 11 and doesn't work with self-signed certificates that we use on test server, but SecureSoket also works fine and has shown even better performance that TLSSocket. You also can grab already patched version of as3crypto from my github (https://github.com/fsbmain/as3public) :)
If you still have problems, please provide endpoint of your webservice so I'll be able test it.
UPD:
I were able to reproduce your issue and tested certificate parsing with my patched as3crypto lib (it still allows to go deeper through the parsing), I also tested parsing of the same certificate but downloaded with the browser - the same result in both cases (as on your screenshot), so the conclusion is that TLSSocket loads correct and full bytes of certificate but fails to parse it. I tried to fix the parsing but it requires deeper dive into the as3crypto DER format implementation. So I'm afraid the only way to use as3httpclient is to fix DER parsing.
BTW why doesn't standard URLLoader fit you?
The as3crypto.swc file here: http://www.igniterealtime.org/downloads/download-landing.jsp?file=xiff/xiff_3_1_0.zip solved my issue.
as3crypto.swc is inside the libs folder, after extracting.
I recently encountered a strange thing. On some of my company's servers when an exception message is printed out (yes, bad, I know. It's for debugging), the actual message isn't displayed. Instead it displays the key for an external string resource and says that "Debugging resource strings are unavailable"
After some research I've come up with the following:
In release mode, Silverlight does not package the xap with the dlls containing the actual error messages in order to save space.
I've found workarounds for OLD versions, but nothing for 4. It seems like there are Developer versions of the SL 2 and 3 runtime which will resolve the errors automatically, but I cannot find one for SL 4.
So my question is this:
What the heck do I need to do to my SL 4 app / computer to let me see the full, detailed errors when it's in release mode?
You can download the developer runtime (which contains the full exception strings) from the GetStarted page - http://www.silverlight.net/getstarted/ - search for "Developer Runtimes for Windows and OSX", it's near the bottom of the page.
Though it is too late to reply, it may help somebody else. We have a web application using Silverlight 4, installed in various test environments. This web application consumes more than one WCF services. All but one of the test environment sites consistently failed with message "Debugging Resource strings are unavailable". Agreeably the real exception was swallowed. Being a Silverlight application, there was no logging, and it always appeared that there was something failing in the Silverlight component. I connected the application in my development environment to that particular test environment, and found out that the problem was in fact in one of the WCF services. I fixed the problem at the service end and the SL component stopped having this problem.
Why was the WCF failing?
The WCF service had the following code in the constructor:
public MyService()
{
//Create an instance of Data Lookup service asycnchronously.
if (_dataLookupSrvc == null)
{
try
{
System.Threading.Tasks.Task.Factory.StartNew(() => _dataLookupSrvc = new LookupDataService.LookupDataService());
}
catch (Exception ex)
{
_log.Error<Exception>(ex);
}
}
}
Somebody moved the underlying LookupDataService.dll from the service folder causing the constructor to fail, but not right away. As the LookupDataService instance was created in anonymous method, the exception logging in this method never took place. Once the LookupDataService.dll was dropped in the service folder, the "Debugging Resource strings are unavailable" message went away.
It was a fun wild goose chase!
Have you already checked the event viewer on the machine where the application crashed? Start->Run. eventvwr