I'm trying to write a simple RTD client to start with something, but I seem not able to make the initial connection. I have found some examples on the web, and best seemed to be this RTD client in C# gist.
Having this on MS-Excel: =RTD("rtdtrading.rtdserver",, "WINZ20_F_0", "HOR") - formula works on Excel and pulls fresh data.
In the code from the gist above, I then tried to instantiate the object with:
var handler = new RtdClient("rtdtrading.rtdserver");
So far, so good. But then, when I try to
var valList = handler.GetValue(new object[] { "WINZ20_G_0", "HOR" });
I get a big Catastrophic failure (0x8000FFFF (E_UNEXPECTED)) from IRtdServer.ConnectData(Int32 topicId, Object[]& parameters, Boolean& newValue), line 24 in the code above.
If I try to use new string[] { "WINZ20_G_0", "HOR" });, then the error changes to Specified array was not of the expected type, happening a bit deeper, but I believe still before ConnectData() is actually run, as the call stack suggestes:
at System.StubHelpers.MngdSafeArrayMarshaler.ConvertSpaceToNative(IntPtr pMarshalState, Object& pManagedHome, IntPtr pNativeHome)
at ProfitRTDAnalyzer.Program.IRtdServer.ConnectData(Int32 topicId, Object[]& parameters, Boolean& newValue)
I can't seem to properly identify how to handle this. Changing the object[] refs to string[] where they relate to those arguments (the topic list), didn't help either (still _array was not of expected type).
According to MS documentation, ConnectData() receives as second parameter a single-dimensional array of strings, so I don't know what is wrong here.
to solve this problem, I have done that:
Create a new class to implement UpdateEvent:
public class UpdateEvent : IRTDUpdateEvent
{
public long Count { get; set; }
public int HeartbeatInterval { get; set; }
public UpdateEvent()
{
// Do not call the RTD Heartbeat()
// method.
HeartbeatInterval = -1;
}
public void Disconnect()
{
// Do nothing.
}
public void UpdateNotify()
{
Count++;
}
}
and then, replace it into GetRtdServer function
IRtdServer GetRtdServer() {
if (_rtdServer == null) {
Type rtd = Type.GetTypeFromProgID(_rtdProgId);
_rtdServer = (IRtdServer) Activator.CreateInstance(rtd);
// Create the updateEvent.
UpdateEvent updateEvent = new UpdateEvent();
_rtdServer.ServerStart(updateEvent);
}
return _rtdServer;
}
Related
I have an Azure Function 2.x that reside on a static class that looks like this
[FunctionName("Register")]
public static async Task<IActionResult> Run([HttpTrigger(AuthorizationLevel.Anonymous, "post")]HttpRequest req, ILogger log)
{
MyTypeClass defReturn = new MyTypeClass();
HttpStatusCode defCode = HttpStatusCode.BadRequest;
/*
* Logics that might or might not changes
* defReturn and defCode value
*/
return StatusCode((int) defCode, JsonConvert.SerializeObject(defReturn))
}
How can i achieve the return StatusCode((int) defCode, JsonConvert.SerializeObject(defReturn)) part ? is there any such method or equivalent in Azure Functions 2.x ?
in Azure Functions 1.x i can do the equivalent with req.CreateResponse(defCode, defReturn) where req is HttpRequestMessage , but i'm trying to stick with 2.x template/standard
Additional explanation : The said Code should return HTTP 400 Bad Request with the defReturn as it's response body to the client. But when i change the defCode to HttpStatusCode.Accepted, it should return HTTP 202 Accepted with the same response body. How can i achieve this ?
Additional explanation#2 : (If i remember correctly) in ASP.NET Core 1.x i can exactly do like that, returning IActionResult by calling a static method StatusCode not StatusCodes (which is a static class that contains HTTP codes constants
Thank you
Quite late reply, but I was stumbling into the same problem today, so maybe this is helpful for other searchers
Option 1: Default Codes
This is stated in detail on the blog Here
Some codes like 200 and 400 are predefined and can be used by
return new OkObjectResult("Your message"); // 200
return new BadRequestObjectResult("Your error message"); // 400
These functions are not available for every known Status Codes but some of the most frequent.
Option 2: Manual setting Code
If you need specific codes, that are not provided by default, you can use the base classes and create them yourself.
To achieve the Teapot Response for example, you can just use
using Microsoft.AspNetCore.Http;
var result = new ObjectResult("Your message");
result.StatusCode = StatusCodes.Status418ImATeapot;
return result;
In this example, the Statuscode is used from the StatusCodes class, but you can use enter other codes as well (usually, just stick to these codes)
Also, the ObjectResult class offers additional formatting options, if needed.
You can create a model class in which you can define two properties, i.e. one form your status code and one for you Json object and later on you can return the complete model. Code sample would be like below:
public static class QueueTriggerTableOutput
{
[FunctionName("QueueTriggerTableOutput")]
[return: Table("outTable", Connection = "MY_TABLE_STORAGE_ACCT_APP_SETTING")]
public static Person Run(
[QueueTrigger("myqueue-items", Connection = "MY_STORAGE_ACCT_APP_SETTING")]JObject order,
ILogger log)
{
return new Person() {
PartitionKey = "Orders",
RowKey = Guid.NewGuid().ToString(),
Name = order["Name"].ToString(),
MobileNumber = order["MobileNumber"].ToString() };
}
}
public class Person
{
public string PartitionKey { get; set; }
public string RowKey { get; set; }
public string Name { get; set; }
public string MobileNumber { get; set; }
}
on the receiving front, you can catch both the property.
P.S.- you have to change the return type of your function.
Hope it helps.
I have a Spring application integrated with ibatis.
I am calling some third party application from where I am getting a String message (a message is combination of messages, there are Strings concatenated with \ delimiter to concatenate the different messages from the third party) as output.
I have to filter this output based on String matching. There are some 150 other Strings. If the output message contains any string out of 150 messages, i have to add some functionality.
I need suggestions to implement it. I am thinking to put 150 Strings in table as the count may increase in future. The Output may contain either no message out of this 150, or any number of combinations with these 150 messages.
I am new to Spring. please tell me how to get these messages from database, since i do not have an id to fetch them or shall I get all of them as list and then compare the output string from the third party. Also please tell me If it wise to keep these messages in database or I can keep them in some property file as well, which one will be better in performance.
Thanks in advance.
Ok, let's start with some possibilities:
IF you will only be adding a few messages in the future and only do so with new releases, then storing the messages in an enum would be a viable choice:
enum ErrorMessage {
SOME_MESSAGE("something, bla bla"),
SOME_OTHER_MESSAGE("something_else"),
...;
private String message;
private ErrorMessage(String message) {
this.message = message;
}
public static ErrorMessage getByErrorMessage(String message) {
for(ErrorMessage errorMessage: message) {
if (errorMessage.message.equals(message)) {
return errorMessage;
}
}
return null;
}
public static boolean exists(String message) {
return getByErrorMessage(message) != null;
}
}
Please note that this version is quite primitive and could be improved by adding all the messages into a static Set:
static Set<String> messagesCache = new Hashset<String>();
//in constructor:
messagesCache.add( message );
// better exists() method:
public static boolean exists(String message) {
return messagesCache.contains(message);
}
Or, as with other solutions, you could only store the actual hashcode of your strings. A hashcode is simple a numeric representation of your string and will be unique enough for you to identify it. Same solution as above:
static Set<String> messagesHashCodes = new Hashset<String>();
//in constructor:
messagesHashCodes .add( message.hashCode() );
// better exists() method:
public static boolean exists(String message) {
return messagesHashCodes .contains(message.hashCode());
}
(Of course, it would be a good idea to check for null values, etc.)
The enum version has one big advantage, if you want to have DIFFERENT actions taken for some of the actions, you can code them into the enum, for example...
SOME_MESSAGE_REQUIRING_AN_ACTION("...") {
#Override
public void doAction(StringBuilder finalString) {
...doSomething.
}
}
...
public void doAction(StringBuilder finalString) {
finalString.append( this.message );
finalString.append( SOME_SEPERATOR );
}
public void static doAction(StringBuilder builder, String errorMessage) {
if (exists(errorMessage)) {
}
}
In this example, you CAN override the doAction method in each enum value, if it should do more/something else than append the message to the StringBuilder. It would also be a nice touch to add some "NULL_MESSAGE" to the enum List that does nothing and is only there to allow easier handling:
UNKNOWN_MESSAGE(null) {
#Override
public void doAction(StringBuilder finalString) {
// do nothing here
}
}
public static ErrorMessage getByErrorMessage(String message) {
for(ErrorMessage errorMessage: message) {
if (errorMessage.message != null && errorMessage.message.equals(message)) {
return errorMessage;
}
}
return UNKNOWN_MESSAGE;
}
This way, you can simple give every single string into your enum method doAction(StringBuilder, String) and get the result: If a message fits, it is added (and some other action taken), if not, it will be ignored, null checks included.
On the other hand, if you messages change quite often, then you might not do a release for such a change but keep the values in a database. In this case, I would use the hashCode() of the message as an id (as I said, unique enough, typically) and load the whole thing into memory when the application starts, allowing you, for example, to build again a Set of hashcodes to compare your errorMessages' hashcodes against.
protected void init() {
// load all error Messages from the database
// put them into a Map<String, String> (hashCode -> Value) or even just a Set<String> (hashcodes)
}
I've got this action in MVC
[OutputCache(Duration = 1200, VaryByParam = "*")]
public ActionResult FilterArea( string listType, List<int> designersID, int currPage = 1 )
{
// Code removed
}
that fails to present the correct HTML with url like
http://example.com/en-US/women/clothing?designersID=158
http://example.com/en-US/women/clothing?designersID=158&designersID=13
Is this a know bug of OutputCache in .NET cause cannot recognize VaryByParam with a list param or am I missing something?
I too had the same issue in MVC3 and I believe it's still the same case in MVC5.
Here is the setup I had.
Request
POST, Content-Type:application/json, passing in an array of string as the parameter
{ "options": ["option1", "option2"] }
Controller Method
[OutputCache(Duration = 3600, Location = OutputCacheLocation.Any, VaryByParam = "options")]
public ActionResult GetOptionValues(List<string> options)
I tried every option possible with OutputCache and it just wasn't caching for me. Binding worked fine for the actual method to work. My biggest suspicion was that OutputCache wasn't creating unique cache keys so I even pulled its code out of System.Web.MVC.OutputCache to verify. I've verified that it properly builds unique keys even when a List<string> is passed in. Something else is buggy in there but wasn't worth spending more effort.
OutputCacheAttribute.GetUniqueIdFromActionParameters(filterContext,
OutputCacheAttribute.SplitVaryByParam(this.VaryByParam);
Workaround
I ended up creating my own OutputCache attribute following another SO post. Much easier to use and I can go enjoy the rest of the day.
Controller Method
[MyOutputCache(Duration=3600)]
public ActionResult GetOptionValues(Options options)
Custom Request class
I've inherited from List<string> so I can call the overriden .ToString() method in MyOutputcache class to give me a unique cache key string. This approach alone has resolved similar issues for others but not for me.
[DataContract(Name = "Options", Namespace = "")]
public class Options: List<string>
{
public override string ToString()
{
var optionsString= new StringBuilder();
foreach (var option in this)
{
optionsString.Append(option);
}
return optionsString.ToString();
}
}
Custom OutputCache class
public class MyOutputCache : ActionFilterAttribute
{
private string _cachedKey;
public int Duration { get; set; }
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
if (filterContext.HttpContext.Request.Url != null)
{
var path = filterContext.HttpContext.Request.Url.PathAndQuery;
var attributeNames = filterContext.ActionParameters["Options"] as AttributeNames;
if (attributeNames != null) _cachedKey = "MYOUTPUTCACHE:" + path + attributeNames;
}
if (filterContext.HttpContext.Cache[_cachedKey] != null)
{
filterContext.Result = (ActionResult) filterContext.HttpContext.Cache[_cachedKey];
}
else
{
base.OnActionExecuting(filterContext);
}
}
public override void OnActionExecuted(ActionExecutedContext filterContext)
{
filterContext.HttpContext.Cache.Add(_cachedKey, filterContext.Result, null,
DateTime.Now.AddSeconds(Duration), System.Web.Caching.Cache.NoSlidingExpiration,
System.Web.Caching.CacheItemPriority.Default, null);
base.OnActionExecuted(filterContext);
}
}
this is the code that i want to run.
Parallel.For(1, itemCount, 1, () =>
{
return new ThreadLocalStateCache()
{
//assigning values to local variables
Receipient = serMailObj.ReceipientList.Dequeue(), //get a single recepeint for the email
mail = serMailObj.Email, //Object of type MailMessage
client = client //object of type SmtpClient
};
}
, (i, loopState) =>
{
doWork(i, loopState.ThreadLocalState);
});
}
//class to store local vairables for each thread
public class ThreadLocalStateCache
{
public KeyValuePair<string, string> Receipient { get; set; }
public MailMessage mail { get; set; }
public SmtpClient client { get; set; }
}
private static void doWork(int instance, ThreadLocalStateCache threadInstance)
{
//send mail
}
and it keeps on saying
The type arguments for method 'System.Threading.Tasks.Parallel.For(long, long, System.Func, System.Func, System.Action)' cannot be inferred from the usage. Try specifying the type arguments explicitly.
I could not find any resource on the internet that explains clearly how to use parallel.for with thread local variables. I am trying to process long list of email recipients and send mails to them. Please tell how can i use parallel.for.
EDIT 1: I am trying this code after reading this article http://www.lovethedot.net/2009/02/parallelfor-deeper-dive-parallel.html
The Parallel.For overloads that take step as the third argument were removed from .NET 4; see comments to http://blogs.msdn.com/b/pfxteam/archive/2009/05/26/9641563.aspx.
Due to that, your call with 5 arguments is resolved to this overload:
For<TLocal>(Int32, Int32, Func<TLocal>, Func<Int32, ParallelLoopState, TLocal, TLocal>, Action<TLocal>)
And obviously the compiler cannot match types of the arguments.
Since the step is 1 anyway, just remove it.
Then you will need to fix the body delegate which must have three parameters (since thread local variable is now separate from loop state object), and add another delegate that will be applied to thread local variables for final computation. At the end, it should be something like this:
Parallel.For( 1, itemCount,
() =>
{ return new ThreadLocalStateCache()
{
Receipient = serMailObj.ReceipientList.Dequeue(),
mail = serMailObj.Email,
client = client
};
},
(i, loopState, threadLocal ) =>
{
doWork(i, threadLocal);
return threadLocal;
},
(threadLocal) => {}
);
I have several tables in my database that have read-only fields that get set on Inserting and Updating, namely: AddDate (DateTime), AddUserName (string), LastModDate (DateTime), LastModUserName (string).
All of the tables that have these values have been set to inherit from the following interface:
public interface IUserTrackTable
{
string AddUserName { get; set; }
DateTime AddDate { get; set; }
string LastModUserName { get; set; }
DateTime LastModDate { get; set; }
}
As such, I have the following method on the Edit.aspx page:
protected void DetailsDataSource_Updating(object sender, LinqDataSourceUpdateEventArgs e)
{
IUserTrackTable newObject = e.NewObject as IUserTrackTable;
if (newObject != null)
{
newObject.LastModUserName = User.Identity.Name;
newObject.LastModDate = DateTime.Now;
}
}
However, by the time it hits this method, the e.OriginalObject has already lost the values for all four fields, so a ChangeConflictException gets thrown during the actual Update. I have tried adding the four column names to the DetailsView1.DataKeyNames array in the Init event handler:
protected void Page_Init(object sender, EventArgs e)
{
// other things happen before this
var readOnlyColumns = table.Columns.Where(c => c.Attributes.SingleOrDefaultOfType<ReadOnlyAttribute>(ReadOnlyAttribute.Default).IsReadOnly).Select(c => c.Name);
DetailsView1.DataKeyNames = DetailsView1.DataKeyNames.Union<string>(readOnlyColumns).ToArray<string>();
DetailsView1.RowsGenerator = new CustomFieldGenerator(table, PageTemplates.Edit, false);
// other things happen after this
}
I've tried making that code only happen on PostBack, and still nothing. I'm at a lose for how to get the values for all of the columns to make the round-trip.
The only thing the CustomFieldGenerator is handling the ReadOnlyAttribute, following the details on C# Bits.
UPDATE: After further investigation, the values make the round trip to the DetailsView_ItemUpdating event. All of the values are present in the e.OldValues dictionary. However, they are lost by the time it gets to the LinqDataSource_Updating event.
Obviously, there are the "solutions" of making those columns not participate in Concurrency Checks or other ways that involve hard-coding, but the ideal solution would dynamically add the appropriate information where needed so that this stays as a Dynamic solution.
i Drovani, I assume you want data auditing (see Steve Sheldon's A Method to Handle Audit Fields in LINQ to SQL), I would do this in the model in EF4 you can do it like this:
partial void OnContextCreated()
{
// Register the handler for the SavingChanges event.
this.SavingChanges += new EventHandler(context_SavingChanges);
}
private static void context_SavingChanges(object sender, EventArgs e)
{
// handle auditing
AuditingHelperUtility.ProcessAuditFields(objects.GetObjectStateEntries(EntityState.Added));
AuditingHelperUtility.ProcessAuditFields(objects.GetObjectStateEntries(EntityState.Modified), InsertMode: false);
}
internal static class AuditingHelperUtility
{
internal static void ProcessAuditFields(IEnumerable<Object> list, bool InsertMode = true)
{
foreach (var item in list)
{
IAuditable entity = item as IAuditable;
if (entity != null)
{
if (InsertMode)
{
entity.InsertedBy = GetUserId();
entity.InsertedOn = DateTime.Now;
}
entity.UpdatedBy = GetUserId();
entity.UpdatedOn = DateTime.Now;
}
}
}
}
Sadly this is not possible with EF v1