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  • Member variable pointers to COM objects

    - by drelihan
    Hi Folks, Is there any problem with keeping member variable pointer refernces to COM objects and reussing the reference through out the class in C++. Is anybody aware of a reason why you would want to call .CreateInstance every time you wanted a to use the COM object i.e. you were getting a fresh instance each time. I cannot see any reason who you would want to do this, Thanks, (No is an acceptable answer!!!)

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  • Need to check uptime on a large file being hosted

    - by trustfundbaby
    I have a dynamically generated rss feed that is about 150M in size (don't ask) The problem is that it keeps crapping out sporadically and there is no way to monitor it without downloading the entire feed to get a 200 status. Pingdom times out on it and returns a 'down' error. So my question is, how do I check that this thing is up and running

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  • How to manage a large dataset using Spring MySQL and RowCallbackHandler

    - by rmarimon
    I'm trying to go over each row of a table in MySQL using Spring and a JdbcTemplate. If I'm not mistaken this should be as simple as: JdbcTemplate template = new JdbcTemplate(datasource); template.setFetchSize(1); // template.setFetchSize(Integer.MIN_VALUE) does not work either template.query("SELECT * FROM cdr", new RowCallbackHandler() { public void processRow(ResultSet rs) throws SQLException { System.out.println(rs.getString("src")); } }); I get an OutOfMemoryError because it is trying to read the whole thing. Any ideas?

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  • Is JSON.stringify() reliable for serializing JSON objects?

    - by Colin
    I need to send full objects from Javascript to PHP. It seemed pretty obvious to do JSON.stringify() and then json_decode() on the PHP end, but will this allow for strings with ":" and ","? Do I need to run an escape() function on big user input strings that may cause an issue? What would that escape function be? I don't think escape works for my purposes. Are there any downsides to JSON.stringify() I need to know about? Thanks

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  • How do i make my text wrap in a <div> with a large border radius

    - by Greg Guida
    in the following code <html> <body> <div style="height:400px; width:400px; -moz-border-radius:100px; -webkit-border-radius:100px; border:3px solid #500; background-color:#a00; overflow:hidden;"> Why is this getting cut at the beginning??? </div> </body> </html> Why isn't the browser wrapping the text around the rounded corners. In webkit browsers(i tested both chrome and safari) the overflow hidden cuts the text outside the border. Firefox just renders text outside the border. I also tried this without overflow:hidden; but again the text just rendered outside the border.

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  • Inserting Large volume of data in SQL Server 2005

    - by Manjoor
    We have a application (written in c#) to store live stock market price in the database (SQL Server 2005). It insert about 1 Million record in a single day. Now we are adding some more segment of market into it and the no of records would be double (2 Millions/day). Currently the average record insertion per second is about 50, maximum is 450 and minimum is 0. To check certain conditions i have used service broker (asynchronous trigger) on my price table. It is running fine at this time(about 35% CPU utilization). Now i am planning to create a in memory dataset of current stock price. we would like to do some simple calculations. I want to know different views of members on this. Please provide your way of dealing with such situation.

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  • NPGSQL seems to have a rather large bug?

    - by Mr Shoubs
    Hello, this is a weird one, when I run the following code all rows are returned from the db. Imagaine what would happen if this was an update or delete. Dim cmd As New NpgsqlCommand cmd.Connection = conn cmd.CommandText = "select * FROM ac_profiles WHERE profileid = @profileId" cmd.Parameters.Add("@profile", 58) Dim dt As DataTable = DataAccess2.DataAccess.sqlQueryDb(cmd) DataGridView1.DataSource = dt My question is why is this happening?

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  • One large file or multiple small files?

    - by Dan
    I have an application (currently written in Python as we iron out the specifics but eventually it will be written in C) that makes use of individual records stored in plain text files. We can't use a database and new records will need to be manually added regularly. My question is this: would it be faster to have a single file (500k-1Mb) and have my application open, loop through, find and close a file OR would it be faster to have the records separated and named using some appropriate convention so that the application could simply loop over filenames to find the data it needs? I know my question is quite general so direction to any good articles on the topic are as appreciated as much as suggestions. Thanks very much in advance for your time, Dan

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  • XStream serializable objects

    - by Jeff Storey
    I am currently using XStream to serialize some of my objects that don't implement Serializable. Is there a way to tell XStream to use Java's default serialization if the object does implement Serializable and to fall back on XML serialization if it does not? Or would I need to implement a simple layer on top of it to check? thanks, Jeff

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  • WPF Coordinates of intersection from two Line objects

    - by Becky Franklin
    I have two Line objects in C# WPF, and I'm trying to construct a method to work out the coordinates at which the lines intersect (if at all). After giving myself a headache reminding myself of high school maths to do this, I can't work out how to map it into programming format - anyone know how to do this? Thanks very much, Becky

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  • objects in datagridview

    - by JaSk
    Im adding objects to a datagridview ( only one kind) through a list ej. List<Material> mater = new List<Material>(); DataGridView dgvMAterial = new DataGridView(); dgvMaterial.DataSource = null; mater.Add((Material)cmbMaterial.SelectedValue); dgvMaterial.DataSource = mater; But every time I click over the datagrid I get an indexoutofrangeexeption. Can somone tell me why? thanks

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  • Visual objects editor

    - by Vladimir
    I am looking for a tool which will make able to edit parts of Java code visually using something like inspector and place code back. For example: Person p = new Person(); p.setName("Bill Libb"); p.setAge(25); This code should be generated from visual inspector and copied into Java IDE. This will help quickly create sample objects for testing.

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  • Processing potentially large STDIN data, more than once

    - by d11wtq
    I'd like to provide an accessor on a class that provides an NSInputStream for STDIN, which may be several hundred megabytes (or gigabytes, though unlikely, perhaps) of data. When I caller gets this NSInputStream it should be able to read from it without worrying about exhausting the data it contains. In other words, another block of code may request the NSInputStream and will expect to be able to read from it. Without first copying all of the data into an NSData object which (I assume) would cause memory exhaustion, what are my options for handling this? The returned NSInputStream does not have to be the same instance, it simply needs to provide the same data. The best I can come up with right now is to copy STDIN to a temporary file and then return NSInputStream instances using that file. Is this pretty much the only way to handle it? Is there anything I should be cautious of if I go the temporary file route?

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  • Searchable list of objects in Java

    - by Christian
    I want to create a large (~300,000 entries) List of self defined objects of the class Drug. Every Drug has an ID and I want to be able to search the Drugs in logarithmic time via that ID. What kind of List do I have to use? How do I declare that it should be searchable via the ID?

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  • Memory Issues When DOM Parsing A Large XML File on Android Devices

    - by tonyc
    Hey awesome SO users, I have an Android application that parses an XML file for users and displays results in a much more mobile friendly format. The app works great for most users, but some users have lots and lots of data and the app crashes on them because it runs out of memory. Is there any way I have a DOM style XML parser quit parsing data after a certain amount of parsing? I only need the first 30 or so elements so it would make the application much more efficient. I'd like to use a SAX or pull parser instead, but the XML I'm parsing is not valid and I have no control over it. Unless anyone has some good SAX solutions that let me parse messy, invalid XML, I think DOM is the only way to go. Thanks for reading!

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  • Using Factory to get Injected objects

    - by ryudice
    Is it good practice to have a Factory method to retrieve injected objects or is it OK to just use the factory method from the DI framework? I'm using structure map, should I just use ObjectFactory.GetInstance();, or should I create factory class and inside this class call ObjectFactory.GetInstance();? because if I call ObjectFactory.GetInstance(); in my classes I would be creating coupling to the DI framework? sorry if I'm being ignorant, I'm new to this concepts. Thanks!

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  • Typesetting a large matrix in LaTeX

    - by Hooked
    I have a 3x12 matrix I'd like to input into my LaTeX (with amsmath) document but LaTeX seems to choke when the matrix gets larger then 3x10: \begin{equation} \textbf{e} = \begin{bmatrix} 1&1&1&1&0&0&0&0&-1&-1&-1&-1\\ 1&-1&0&0&1&1&-1&-1&0&0&1&-1\\ 0&0&1&-1&1&-1&1&-1&1&-1&0&0 \end{bmatrix} \end{equation} The error: Extra alignment tab has been changed to \cr. tells me that I have more & then the bmatrix environment can handle. Is there a proper way to handle this? Also it seems that the alignment for 1's and the -1's are different, is that also expected of the bmatrix?

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  • DataGridView lags for a second with large data updates

    - by alexD
    I have a DataGridView with about 400 rows and 10 columns. When the user first displays this table, it receives all of the data from the server and populates the table. The DGV uses a DataTable as it's data source, and when updating the DataTable I use row.BeginEdit/EndEdit and acceptChanges, but when the View itself is updated it lags for a second while all of the DGV is being updated. I am wondering if there is a way to make this smooth, so that for example, if the user is scrolling through the data and it updates, it won't interrupt the scrolling. Or if the user is moving the display around the screen and it updates, it won't interrupt. Is there an easy way to do this? If not, is there away to prevent the DGV from updating the view until all events have ended so it won't be repainted until the user stops scrolling, dragging, etc ?

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  • Change Large Number of Record Keys using Map Table

    - by Coyote
    I have a set of records indexed by id numbers, I need to convert these record's indexes to a new id number. I have a two column table mapping the old numbers to the new numbers. For example given these two tables, what would the update statement look like? Given: OLD_TO_NEW oldid | newid ----------------- 1234 0987 7698 5645 ... ... and id | data ---------------- 1234 'yo' 7698 'hey' ... ... Need: id | data ---------------- 0987 'yo' 5645 'hey' ... ... This oracle so I have access to PL/SQL, I'm just trying to avoid it.

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  • Deliver large volume of automatic notification emails without being throttled

    - by jack
    I think most website has certain needs to deliver emails to its users, e.g. account activation emails, private messsage notification, comment notification, etc. Take my site as example, among 5,000 registered users, about 1,500 signed up using gmail.com box, 1,000 using yahoo.com and another 1,000 using hotmail.com. Every now and then I receive complaints from users that they never receive account activation email, sometime it goes to junk folder sometimes it just not show in any folder. Maybe it's kind of being "throttled" when exceeded maximum number of messages sent from same ip address to gmail.com/yahoo.com/hotmail.com during certain period of time? I'm using Postfix and there seems no problem with configuration since 90% of emails can be delivered to gmail.com/yahoo.com/hotmail.com boxes successfully. I noticed twitter is delivering millions of such automatic notifications to its users but I never missed a message from them. How do they archive this? Is there a permanent white list on gmail.com, yahoo.com or hotmail.com? Thanks in advance.

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  • Quick backup system for large projects

    - by kamziro
    I've always backed up all my source codes into .zip files and put it in my usb drive and uploaded to my server somewhere else in the world.. however I only do this once every two weeks, because my project is a little big. Right now my project directories (I have a few of them) contains a hierarchy of c++ files in it, and interspersed with them are .o files which would make backing up take a while if not ignored. What tools exist out there that will let me just back things up efficiently, conveniently and lets me specify which file types to back up (lots of .png, .jpg and some text types in there), and which directories to be ignored (esp. the build dirs)? Or is there any ingenious methods out there that people use?

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  • Python: Cannot concatenate str and NoneType objects

    - by Chase Higgins
    sql = """ INSERT INTO [SCHOOLINFO] VALUES( '""" + self.accountNo + """', '""" + self.altName + """', '""" + self.address1 + """', '""" + self.address2 + """', '""" + self.city + """', '""" + self.state + """', '""" + self.zipCode + """', '""" + self.phone1 + """', '""" + self.phone2 + """', '""" + self.fax + """', '""" + self.contactName + """', '""" + self.contactEmail + """', '""" + self.prize_id + """', '""" + self.shipping + """', '""" + self.chairTempPass + """', '""" + self.studentCount + """' ) """; I have the following code and Python keeps throwing the error that it cannon concatenate strings and nonetype objects. The thing is I have verified every variable here is in fact a string and is not null. I have been stuck on this for quite some time today, and any help would be greatly appreciated.

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  • Linux core dumps are too large!

    - by themoondothshine
    Hey guys, Recently I've been noticing an increase in the size of the core dumps generated by my application. Initially, they were just around 5MB in size and contained around 5 stack frames, and now I have core dumps of 2GBs and the information contained within them are no different from the smaller dumps. Is there any way I can control the size of core dumps generated? Shouldn't they be at least smaller than the application binary itself? Binaries are compiled in this way: Compiled in release mode with debug symbols (ie, -g compiler option in GCC). Debug symbols are copied onto a separate file and stripped from the binary. A GNU debug symbols link is added to the binary. At the beginning of the application, there's a call to setrlimit which sets the core limit to infinity -- Is this the problem?

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