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  • C# - periodic data reading and Thread.Sleep()

    - by CaldonCZE
    Hello, my C# application reads data from special USB device. The data are read as so-called "messages", each of them having 24 bytes. The amount of messages that must be read per second may differ (maximal frequency is quite high, about 700 messages per second), but the application must read them all. The only way to read the messages is by calling function "ReadMessage", that returns one message read from the device. The function is from external DLL and I cannot modify it. My solution: I've got a seperate thread, that is running all the time during the program run and it's only job is to read the messages in cycle. The received messages are then processed in main application thread. The function executed in the "reading thread" is the following: private void ReadingThreadFunction() { int cycleCount; try { while (this.keepReceivingMessages) { cycleCount++; TRxMsg receivedMessage; ReadMessage(devHandle, out receivedMessage); //...do something with the message... } } catch { //... catch exception if reading failed... } } This solution works fine and all messages are correctly received. However, the application consumes too much resources, the CPU of my computer runs at more than 80%. Therefore I'd like to reduce it. Thanks to the "cycleCount" variable I know that the "cycling speed" of the thread is about 40 000 cycles per second. This is unnecessarily too much, since I need to receive maximum 700 messagges/sec. (and the device has buffer for about 100 messages, so the cycle speed can be even a little lower) I tried to reduce the cycle speed by suspending the thread for 1 ms by Thread.Sleep(1); command. Of course, this didn't work and the cycle speed became about 70 cycles/second which was not enough to read all messages. I know that this attempt was silly, that putting the thread to sleep and then waking him up takes much longer than 1 ms. However, I don't know what else to do: Is there some other way how to slow the thread execution down (to reduce CPU consumption) other than Thread.Sleep? Or am I completely wrong and should I use something different for this task instead of Thread, maybe Threading.Timer or ThreadPool? Thanks a lot in advance for all suggestions. This is my first question here and I'm a beginner at using threads, so please excuse me if it's not clear enough.

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  • How to pass data between controls and persist the values in WPF

    - by randyc
    I am stuck on how to pass data from one control to another. If I have a listbox control and the Contol Item contains a datatemplate which renders out 5 fields ( first name, last name, email, phone and DOB) all of which come from an observable collection. How can I allow the user to select a listbox item and have the valuesbe stored within a new listbox control? Is this done through the creation of a new collection or is there a more simple way to bind these values to a new control? thank you,

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  • Passing data to overridden base method in C#

    - by UpTheCreek
    Bit of a dumb question, but I'm wondering what the accepted way of passing data from back to an overridden base method is in c#. e.g. I guess I could do: class A { int x; public virtual void DoStuff() { Console.WriteLine(x); } } class B : A { public override void DoStuff() { x = 1; base.DoStuff(); } } But is there a better method that for example doesn't require the use of a member variable?

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  • iphone coredata removing records between two entities connected by relation ship

    - by satyam
    I'm implementing core data in my iphone app. It has two entities. Entity1: LatestData Entity2: LatestDetailedData LatestData has URL, publishedDate, heading LatestDetailedData has URL, NewsDescription, PublishedDate, Author Both entities have same URL for a record. Both the entities are connected with inverse relation ship. And the relation ship is "delete-Cascaded" What I want: If I remove a record in LatestData, I want the record with same URL in LatestDetailedData must also be deleted. How?

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  • What data actually gets cached in InnoDB/MySQL?

    - by ming yeow
    Hi folks, i am trying to optimize performance for my database. My question is - what get cached in the db memory? For example: (table with 2 columns: key (indexed), data (not indexed) updated (not indexed) Select * where updated=20100202 (the db will do a scan - will the scanned rows be kept in memory?) Select * where key = 20 (the db will refer to the index - will the identified rows be kept in memory?)

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  • Are cookies enough for storing login data? (PHP)

    - by jpjp
    I am reading the Head First PHP/Mysql book and they say to store both the user's username, email into cookies and sessions. Is it safe to assume that everyone know a day has cookies? Or should I store both in sessions and cookies? I am not storing any sensitive data in cookies such as password, etc.

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  • Mysql query to fetch data

    - by hnihar
    i have a table "request" with 4 columns namely: 1.recId :long primary key 2.interactionId:long 3.requestedBy:boolean 4.requestedType:boolean and data is as follows: VALUES (185,455699,0,5), (186,455746,0,1), (187,455746,1,1), (188,455752,0,1), (189,455753,0,1), (190,455753,1,1), (191,455754,1,1) i want a query to fetch all the rows where interactionId is same and having requestedBy both 1 and 0 values and requestType=1; regards, Nihar

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  • FormsAuthentication AuthCookie data type

    - by FreshCode
    Does the original data type of the username string in a call to FormsAuthentication.SetAuthCookie(...) make any difference with regards to security or code maintainability? As I understand it, the cookie is encrypted and used to identify a user on each request. I'm curious whether it should affect the design of the primary key on my Users table in my database, eg. Guid vs int or a unique username string.

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  • Grid View Button Passing Data Via On Click

    - by flyersun
    Hi, I'm pretty new to C# and asp.net so aplogies if this is a really stupid question. I'm using a grid view to display a number of records from a database. Each row has an Edit Button. When the button is clicked I want an ID to be passed back to a funtion in my .cs file. How do I bind the rowID to the Button field? I've tired using a hyper link instead but this doens't seem to work because I'm posting back to the same page which already has a Permanter on the URL. asp.net <asp:GridView ID="gvAddresses" runat="server" onrowcommand="Edit_Row"> <Columns> <asp:ButtonField runat="server" ButtonType="Button" Text="Edit"> </Columns> </asp:GridView> c# int ImplantID = Convert.ToInt32(Request.QueryString["ImplantID"]); Session.Add("ImplantID", ImplantID); List<GetImplantDetails> DataObject = ImplantDetails(ImplantID); System.Data.DataSet DSImplant = new DataSet(); System.Data.DataTable DTImplant = new DataTable("Implant"); DSImplant.Tables.Add(DTImplant); DataColumn ColPostCode = new DataColumn(); ColPostCode.ColumnName = "PostCode"; ColPostCode.DataType = typeof(string); DTImplant.Columns.Add(ColPostCode); DataColumn ColConsigneeName = new DataColumn(); ColConsigneeName.ColumnName = "Consignee Name"; ColConsigneeName.DataType = typeof(string); DTImplant.Columns.Add(ColConsigneeName); DataColumn ColIsPrimaryAddress = new DataColumn(); ColIsPrimaryAddress.ColumnName = "Primary"; ColIsPrimaryAddress.DataType = typeof(int); DTImplant.Columns.Add(ColIsPrimaryAddress); DataColumn ColImplantCustomerDetailsID = new DataColumn(); ColImplantCustomerDetailsID.ColumnName = "Implant ID"; ColImplantCustomerDetailsID.DataType = typeof(int); DTImplant.Columns.Add(ColImplantCustomerDetailsID); foreach (GetImplantDetails Object in DataObject) { DataRow DRImplant = DTImplant.NewRow(); DRImplant["PostCode"] = Object.GetPostCode(); DRImplant["Consignee Name"] = Object.GetConsigneeName(); DRImplant["Primary"] = Object.GetIsPrimaryAddress(); DRImplant["Implant ID"] = Object.GeTImplantCustomerDetailsID(); DTImplant.Rows.Add(DRImplant); <--- this is what I need to be added to the button } gvAddresses.DataSource = DTImplant; gvAddresses.DataBind();

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  • Best Ways to send message or data to fax machine

    - by CitadelCSAlum
    I currently am working on a web application that needs to collect data from a form and will take the information and put it in a report format and sent it to a fax machine and print it out. What is the easiest way to do this. I would like it to act similar to collecting informastion off of a form and then sending an email, but I would like to send it to a fax instead. Thanks!

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  • ADO.net Data Services - Querying

    - by Prajuvan
    Just I started learning ADO.NET Data Services. Some Pages show the querying like (sample) http://localhost:1705/ServiceExample/SomeService.svc/Persons(1)/Name http://localhost:1705/ServiceExample/SomeService.svc/Persons(1)/Name/$value Is it XPath or XQuery? Where can i get complete rules for forming such queries with examples? Thanks in advance.

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  • What's the name of the storage paradigm that uses cubes subdivided into 8 smaller cubes ad infinitum?

    - by Eric
    If I have a cube divided into 8 smaller cubes, each of which may be subdivided into a further 8 cubes, ad infinitum, what is the name of my system? I know that it's a special case of a tree, where each brance contains exactly 8 other leaves/branches. I remember the name starting with "Oct", and there was a wikipedia article on it, but I honestly can't find it! Does anyone know what such a data structure is actually known as?

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  • JQM dialog is opening in new page instead of dialog

    - by K D
    Thank you for taking the time to read my question. I'm trying to get a dialog box to open using Jquery mobile. I followed the documentation and used the data-rel="dialog" notation along with the data-transition="pop". Instead of a dialog appearing on the same page, I get a brand new page with the dialog appearing. Can someone kindly assist me on how to fix this functionality. Here is my code for the initial main page: <article> <ul data-role="listview" data-split-icon="star" data-split-theme="d" data-inset="true"> <li><a href="#black_seed_desc" data-rel="dialog" ><img src="black_seed.jpg"/> <h3>Black Seed Oil</h3> </a> <a href="#black_seed_purchase" data-rel="dialog" data-transition="pop">Purchase Black Seed Oil</a> </li> </ul> </article> Here is my code for the dialog page: <div data-role="dialog" id="black_seed_purchase" data-theme="c"> <section data-role="content"> <h1>Purchase Black Seed Oil?</h1> <p>By purchasing Black Seed Oil you will receive an email receipt copy sent to you for your reference.</p> <a href="#purchase_blackseed" data-inline="true" data-corners="true" data-rel="back" data-role="button" data-shadow="true" data-iconshadow="true" data-wrapperrels="span"> <span> <span>Buy: $49.99</span> <span>&nbsp;</span> </span> </a> <a href="#" data-role="button" data-rel="back" data-inline="true" data-corners="true" data-wrapperrels="span" data-shadow="true" data-iconshawdow="true"> <span> Cancel </span> </a> </section> </div> Here is a working example. http://jsfiddle.net/Gajotres/w3ptm/?

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  • SQL OUTER JOIN with NEWID to generate random data for each row

    - by CL4NCY
    Hi, I want to generate some test data so for each row in a table I want to insert 10 random rows in another, see below: INSERT INTO CarFeatures (carID, featureID) SELECT C.ID, F.ID FROM dbo.Cars AS C OUTER APPLY ( SELECT TOP 10 ID FROM dbo.Features ORDER BY NEWID() ) AS F Only trouble is this returns the same values for each row. How do I order them randomly?

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  • Calculating average (AVG) and grouping by week on large data set takes too long

    - by caioiglesias
    I'm getting average prices by week on 7 million rows, it's taking around 30 seconds to get the job done. This is the simple query: SELECT AVG(price) as price, yearWEEK(FROM_UNIXTIME(timelog)) as week from pricehistory where timelog > $range and product_id = $id GROUP BY week The only week that actually gets data changed and is worth averaging every time is always the last one, so this calculation for the whole period is a waste of resources. I just wanted to know if mysql has a tool to help out on this.

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  • Why is the data I am printing not in a table format

    - by udaya
    Hi This is my program .when i submit the print button i can print the datas but they are not aligned in the table formatthe format in which i need the print to be...How can i print in the correct format <html> <head> <script type="text/javascript" src="http://jqueryjs.googlecode.com/files/jquery-1.3.1.min.js" > </script> <script type="text/javascript"> function PrintElem(elem) { //alert('ddd'); Popup($(elem).text()); } function Popup(data) { var mywindow = window.open('', 'mydiv', 'height=400,width=600'); mywindow.document.write('<html><head><title>my div</title>'); /*optional stylesheet*/ //mywindow.document.write('<link rel="stylesheet" href="main.css" type="text/css" />'); mywindow.document.write('</head><body >'); mywindow.document.write(data); mywindow.document.write('</body></html>'); mywindow.document.close(); mywindow.print(); return true; } </script> </head> <body> <div id="mydiv"> <table width="200" border="1"> <tr> <td>sss</td> <td>sssss;</td> <td>snssbsp;</td> </tr> <tr> <td>ssss;</td> <td>sssnbsp;</td> <td>snbsp;</td> </tr> <tr> <td>snbsp;</td> <td>snbsp;</td> <td>snbsp;</td> </tr> </table> </div> <input type="button" value="Print Div" onClick="PrintElem('#mydiv')" /> </body> </html>

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