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• C# socket blocking behavior

  - by Gearoid Murphy

  My situation is this : I have a C# tcp socket through which I receive structured messages consisting of a 3 byte header and a variable size payload. The tcp data is routed through a network of tunnels and is occasionally susceptible to fragmentation. The solution to this is to perform a blocking read of 3 bytes for the header and a blocking read of N bytes for the variable size payload (the value of N is in the header). The problem I'm experiencing is that occasionally, the blocking receive operation returns a partial packet. That is, it reads a volume of bytes less than the number I explicitly set in the receive call. After some debugging, it appears that the number of bytes it returns is equal to the number of bytes in the Available property of the socket before the receive op. This behavior is contrary to my expectation. If the socket is blocking and I explicitly set the number of bytes to receive, shouldn't the socket block until it recv's those bytes?, any help, pointers, etc would be much appreciated.

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• Add CSS Class to link based on Character Count with jquery

  - by Wes

  I have links that load dynamically onto a background to make them look like buttons. Some of the links take up two lines and some of the links take up 1 line. Eithe way they need to be vertically centered. My plan to to append a class based on the number of characters and then adjust the padding from there. So if the link's text is 25 characters (including spaces) or less - append class 'small' if the link's text is greater than 25 characters - append class 'large' How would I go about doing this with jQuery?

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• Why does adding a reference to project targeting .NET Framework 4.0 fail?

  - by Malcolm Post

  We have two projects that are both class libraries. Project 1 is a VS 2008 project and targets the .NET Framework 3.5. Project 2 is a VS 2010 (release candidate) project that targets the .NET Framework 4.0. When I try to add a reference to Project 2 in Project 1, it fails with a less than informative error message. I know that if I change the target Framework for Project 2 to 3.5, then adding the reference will work. My question is, if I don't change the target frameworks, but convert Project 1 to VS 2010, will the referencing work? Stated another way, is there some inherent incompatiblity between class libraries targeting different framework versions, or is it failing for me because VS 2008 doesn't know about the 4.0 framework?

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• SQL query not taking values more than 2100

  - by user175084

  SELECT MachineID, MachineName, count(ID) as Total, sum(Size) as TotalSize FROM Files join Machines on Files.MachineID = Machines.MachineID Where Files.MachineID In(sql.Append(string.Format("@MachineId{0}", i)); group by Files.MachineID,MachineName now when the machinId count is less than 2100 the query is performed and if it machines go above 2100 an error is thrown Error: The incoming tabular data stream (TDS) remote procedure call (RPC) protocol stream is incorrect. Too many parameters were provided in this RPC request. The maximum is 2100. how do i make increase the limit or just avoid getting this error.. and put values in gridview thanks..

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• How would MVVM be for games?

  - by Benny Jobigan

  Particularly for 2d games, and particularly silverlight/wpf games. If you think about it, you can divide a game object into its view (the graphic on the screen) and a view-model/model (the state, ai, and other data for the object). In silverlight, it seems common to make each object a user control, putting the model and view into a single object. I suppose the advantage of this is simplicity. But, perhaps it's less clean or has some disadvantages in terms of the underlying "game engine". What are your thoughts on this matter? What are some advantages and disadvantages of using the MVVM pattern for game development? How about performance? All thoughts are welcome.

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• Combining features from other projects in an ASP.NET MVC application

  - by Katie D

  Hello, I am writing an ASP.NET MVC application that combines a set of features from existing applications. The new application is suppose to use UI features and logic created (especially for this purpose) in the existing applications. For that reason I wanted to create in the existing applications some kind of a "blackbox" that I will be able to drop in my new application along with a matching connection string, and it will work independently, binding data on it's own. I thought about using partial views, but I am having trouble with passing the model data to it, since the controller of the new application should not know about the model of the existing applications. I can not use ASP.NET WebForms, since my application should be a "postback-less" application, and ASP.NET AJAX toolkit or frameworks alike are out of the question. Any help would be greatly appreciated. Thank you, Katie

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• How to format a string as a telephone number in C#

  - by Brian G

  I have a string "1112224444' it is a telephone number. I want to format as 111-222-4444 before I store it in a file. It is on a datarecord and I would prefer to be able to do this without assigning a new variable. I was thinking: String.Format("{0:###-###-####}", i["MyPhone"].ToString() ); but that does not seem to do the trick. ** UPDATE ** Ok. I went with this solution Convert.ToInt64(i["Customer Phone"]).ToString("###-###-#### ####") Now its gets messed up when the extension is less than 4 digits. It will fill in the numbers from the right. so 1112224444 333 becomes 11-221-244 3334 Any ideas?

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• How to store static content across branches in a single location in version control

  - by Shravan

  [Just a random thought] I have a pdf doc that is downloaded when the user clicks on 'help' on my website. Now, this is a pretty huge document and is saved in version control (SVN) and is thus copied for all branches that exist in SVN. This is static content and something that developers are not working on, and does not change often. Is there a more efficient way to store it (that would not hamper local deployments) that would make SVN checkouts and updates relatively faster. I know the benefit we get is not huge, this is something that came to my head none the less.

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• Overlapping images w/ image maps obstructing each other

  - by Hamster

  Information: The images have large transparent sections, so each must be overlapped to create the needed effect. Specifically, the clickable portions of each image are in weird trapezoid shapes meant to be pressed up against each other. Images have image maps with large portions being overlapped by the transparent portions of other nearby (trapezoid) images. I don't expect any change in z indexes will solve this... Combining the image files into a larger single one to overlay a single image map for each section seems less than ideal, especially since I may need to re-order or rename them later and such. Never mind hover animations and other possibilities down the road. What would be the best workaround?

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• Is this class + constructor definition pattern overly redundant?

  - by Protector one

  I often come across a pattern similar to this: class Person { public string firstName, lastName; public Person(string firstName, string lastName) { this.firstName = firstName; this.lastName = lastName; } } This feels overly redundant (I imagine typing "firstName" once, instead of thrice could be enough…), but I can't think of a proper alternative. Any ideas? Maybe I just don't know about a certain design pattern I should be using here? Edit - I think I need to elaborate a little. I'm not asking how to make the example code "better", but rather, "shorter". In its current state, all member names appear 3 times (declaration, initialization, constructor arguments), and it feels rather redundant. So I'm wondering if there is a pattern (or semantic sugar) to get (roughly) the same behavior, but with less bloat. I apologize for being unclear initially.

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• How to deal with Rounding-off TimeSpan?

  - by infant programmer

  I take the difference between two DateTime fields, and store it in a TimeSpan variable, Now I have to round-off the TimeSpan by the following rules: if the minutes in TimeSpan is less than 30 then Minutes and Seconds must be set to zero, if the minutes in TimeSpan is equal to or greater than 30 then hours must be incremented by 1 and Minutes and Seconds must be set to zero. TimeSpan can also be a negative value, so in that case I need to preserve the sign.. I could be able to achieve the requirement if the TimeSpan wasn't a negative value, though I have written a code I am not happy with its inefficiency as it is more bulky .. Please suggest me a simpler and efficient method. Thanks regards,

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• Solution: Android INSTALL_FAILED_INSUFFICIENT_STORAGE error.

  - by Andrew Smith

  The INSTALL_FAILED_INSUFFICIENT_STORAGE error is the bane of every Android developer's life. It happens regardless of app size, or how much storage is available. Rebooting the target device fixes the problem briefly, but it soon comes back. There are hundreds (if not thousands) of message board posts from people asking why the problem occurs, but the folks at Google are frustratingly silent on the issue. There is a simple workaround. If your test device is running Android 2.2 or later then add the android:installLocation attribute to your application's manifest file, with the value "preferExternal". This will force the app to be installed on the device's external storage, such as a phone's SD card. For example: <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.andrewsmith.android.darkness" android:installLocation="preferExternal" This is more of a band-aid than a fix, and it may not be ideal if you want your finished app to install on the device's internal memory. But it will at least make the development process a lot less frustrating.

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• Frame skipping with OpenGL and WinAPI?

  - by user146780

  Here is my situation. I'm creating a drawing application using OpenGL and WinAPI. My OpenGL frame has scrollbars which renders the screen and modifies GlTranslatef when it gets a scroll message. The problem is wen I get too many shapes the scrollbar is less responsive since it cannot rerender it each and every time it gets a scroll message. How could I make it so the scrollbar has priority. I want it to skip drawing if it would compromise the smoothness of the scrolling. I thought of doing rendering on a separate thread but I was told all UI things should stay on the same thread. Thanks

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• Would you take a pay-cut to get a higher position?

  - by jonathanconway

  Say you're in a contracting developer role at a bank that pays well and will probably be extended. Then you get offered a permanent role at an IT solution provider as a Senior Developer/Technical Lead. Would you stick with the contracting, or go to the permanent role? The contract role: pays well will probably be extended provides finance industry experience is reasonably challenging, although I don't get much ownership over the projects The permanent role: pays less gives me technical lead/team lead experience- involves a range of websites for different clients, and I get to take ownership of projects much more challenging technically, as I have to "earn my stripes" within the team before I'll be given team lead responsibilities. If you were in this situation, would you take the pay-cut and go with the permanent role? Or would you continue contracting, and not feel like you might have missed out on something really good?

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• How to circumvent ISP Limiting "Unknown" traffic - (SSH)Proxy, VPN

  - by connery

  I am having issues with using a proxy/VPN, with my current ISP (Comenersol, Spain). From my point of view they limit traffic by protocol or by traffic they "know" and "dont know". I'll explain my findings so far below. Internet connection in Spain: ~400-420KByte/sec (speedtest.net) OpenVPN Server in Sweden(pfsense): 100/100Mbit. LZO Compression. TCP. Tun. Aes128 Squid Proxy server in Sweden (pfsense): 100/100 (same box as the vpn server). Plain, no encryption. Runs in stealth mode to hide the use of proxy. NOT running OpenVPN or Squid Proxy, this is my findings: When I download a file from my pfsense box in Sweden, I get maximum speed When I run speedtest.net and choose any european server (including Swedish), I get max speed When I download a torrent (with non default port above 10K), I get limited to ~100KByte/sec. Encryption is turned off If I download something through https, I get max speed Running either Squid Proxy or VPN, this is my findings When I download a file from my pfsense box in Sweden, I get ~100KByte/sec When I run speedtest.net and choose any european server (including Swedish and Spanish), I get ~100Kbyte/sec When I download a torrent, I get same limitation ~100KByte/sec When I download something through https, I get ~100KByte/sec I verify the speeds above with speedtest.net measure, firefox measure in addition to having bmon running in terminal in the background. This way I am certain that the speeds I get presented, are in fact correct. If I connect through a different ISP with VPN or Squid Proxy, I get better speeds (400KByte/sec ++) In short: Whenever I tunnel my traffic through Sweden, my SPanish ISP throttles the traffic. I thought tunneling it through Squid would solve the issue, since I then would no longer hide my traffic through encryption. This does not seem to be the case. Wget and fetch gives same result. I did not try 'nc', but I assume this would give the same result. Does anyone know how to circumvent this issue? I would very much like to be able to get full speed with Swedish ip, as this would make me able to stream TV at higher quality than today. 100KByte/sec just does not cut it quality wise. Thanks for reading. Looking forward for your help.

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• Get the last N rows in the database in order?

  - by Kristopher

  Let's say I have the following database table: record_id | record_date | record_value -----------+-------------+-------------- 1 | 2010-05-01 | 195.00 2 | 2010-07-01 | 185.00 3 | 2010-09-01 | 175.00 4 | 2010-05-01 | 189.00 5 | 2010-06-01 | 185.00 6 | 2010-07-01 | 180.00 7 | 2010-08-01 | 175.00 8 | 2010-09-01 | 170.00 9 | 2010-10-01 | 165.00 I want to grab the last 5 rows with the data ordered by record_date ASC. This is easy to do with: SELECT * FROM mytable ORDER BY record_date ASC LIMIT 5 OFFSET 4 Which would give me: record_id | record_date | record_value -----------+-------------+-------------- 6 | 2010-07-01 | 180.00 7 | 2010-08-01 | 175.00 3 | 2010-09-01 | 175.00 8 | 2010-09-01 | 170.00 9 | 2010-10-01 | 165.00 But how do I do this when I don't know how many records there are and can't compute the magic number of 4? I've tried this query, but if there are less than 5 records, it results in a negative OFFSET, which is invalid: SELECT * FROM mytable ORDER BY record_date ASC LIMIT 5 OFFSET (SELECT COUNT(*) FROM mytable) - 5; So how do I accomplish this?

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• Iphone geo location permission check

  - by Johnny Mast

  Dear Developers, Hi i have a quick question about the iphone (iOS) geolocation api's. Currenly i have a map in my application and the operating system will ask the user if it wants to allow the use of geolocations. Now thats all nice but the thing is i want to change my app when geolocations is allowed to a so called "Geo location" mode where new options are available or "standard" mode with less ui elements when permissions are not granted. What can i use to check if permission is granted?. So basicaly is that an api that tells me permission granted yes or no.

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• Nginx logic (if cookie set, redirect here...) Is it possible?

  - by Matthew Steiner

  So, I have a pretty basic need, but I can't figure out if it's even possible, much less how to do it. I have a main page that anyone can see. Most of the rest of the application can be seen only if logged in (hence, a "set cookie"). So I was thinking, as long as they don't have a cookie set, they can just see a cached version of nginx. I can get it caching with this: proxy_cache STATIC; proxy_cache_valid 200 1d; proxy_cache_use_stale error timeout invalid_header updating http_500 http_502 http_503 http_504; And it helps a ton. (instead of 15 requests per second it gets over 1000). Now I just need some sort of "server logic" to say only serve the cached page if they have no cookie, otherwise, load the dynamic page (which will automatically redirect them into the app). Any ideas?

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• How to sanely read and dump structs to disk when some fields are pointers?

  - by bp

  Hello, I'm writing a FUSE plugin in C. I'm keeping track of data structures in the filesystem through structs like: typedef struct { block_number_t inode; filename_t filename; //char[SOME_SIZE] some_other_field_t other_field; } fs_directory_table_item_t; Obviously, I have to read (write) these structs from (to) disk at some point. I could treat the struct as a sequence of bytes and do something like this: read(disk_fd, directory_table_item, sizeof(fs_directory_table_item_t)); ...except that cannot possibly work as filename is actually a pointer to the char array. I'd really like to avoid having to write code like: read(disk_df, *directory_table_item.inode, sizeof(block_number_t)); read(disk_df, directory_table_item.filename, sizeof(filename_t)); read(disk_df, *directory_table_item.other_field, sizeof(some_other_field_t)); ...for each struct in the code, because I'd have to replicate code and changes in no less than three different places (definition, reading, writing). Any DRYer but still maintainable ideas?

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• Can pydoc/help hide the documentation for inherited class methods and attributes?

  - by EOL

  When declaring a class that inherits from a specific class: class C(dict): added_attribute = 0 the documentation for C lists all the methods of dict (either through help(C) or pydoc). Is there a way to hide the inherited methods from the automatically generated documentation (the documentation string can refer to the base class, for non-overwritten methods)? This would be useful: pydoc lists the functions defined in a module after its classes. Thus, when the classes have a very long documentation, a lot of less than useful information is printed before the new functions provided by the module are presented, which makes the documentation harder to exploit (you have to skip all the documentation for the inherited methods until you reach something specific to the module being documented).

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• In DOM is it OK to use .notation for getting/setting attributes?

  - by Ziggy

  Hi In DOM, is it OK to refer to an element's attributes like this: var universe = document.getElementById('universe'); universe.origin = 'big_bang'; universe.creator = null; universe.style.deterministic = true; ? My deep respect for objects and their privacy, and my sense that things might go terribly wrong if I am not careful, makes me want to do everything more like this: var universe = document.getElementById('universe'); if(universe.hasAttribute('origin')) then universe.origin = 'big_bang'; etc... Is it really necessary to use those accessor methods? Of course it may be more or less necessary depending on how certain I am that the elements I am manipulating will have the attributes I expect them to, but in general do the DOM guys consider it OK to use .notation rather than getters and setters? Thanks!

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• How to roll my own index in c#?

  - by bill seacham

  I need a faster way to create an index file. The application generates pairs of items to be indexed. I currently add each pair as it is generated to a sorted dictionary and then write it out to a disk file. This works well until the number of items added exceeds one million, at which time it slows to the point that is unacceptable. There can be as many as three million data items to be indexed. I prefer to avoid a database because I do not want to significantly increase the size of the deployment package, which is now less than one-half of one megabyte. I tried Access but it is even slower than the sorted dictionary -if it had an efficient bulk load utility then that might work, but I do not find such a tool for Access. Is there a better way to roll my own index?

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• What would be a good "CMS" for me to use?

  - by Tim Geerts

  Hey, I'm looking for some sort of CMS system to implement here in terms of "documentation" system. Now, I'm not to sure about which system(s) would suit my needs best, so I thought I'd come here and type up my requirements so you could help me in narrowing down all the different options. One important note to make is that I'm not looking at a system where I can store certain documents (word, pdf, whatever). Rather at a system where I can type the "documentation"-text in some sort of post (like a blog). Requirements: - Multilanguage support - Tagging - Decent search support (tags, groupings, categories) - Version-control of posts/articles - Possibility of exporting post(s) to a pdf file - Support for multi-user (usergroup X can only see those posts, usergroup Y can see others, etc...) I know, these are some strange requirements if they're all combined, and I reckon most of you would perhaps say that I'd have to develop something like this inhouse rather then finding a descent working product out there (open source if possible). None the less, I thought I'd at least ask the opinion of y'all. Regards, Tim

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• Why use a Rails-like deployment mechanism over 'git pull' for releasing?

  - by Chad Johnson

  To release my centralized webapp, I COULD have a vhost pointed to some directory and then just do a 'git pull' when I want to release, updating the files. But Rails has a different deployment mechanism: it copies files to a subdirectory and then points a symlink ('current') to that new subdirectory. I understand that it probably more acceptable to do a Rails-like deployment because the release is built in some directory, and then the symlink is pointed to that directory, so this is much faster, and it's less likely that users would experience weird issues while a release is happening. Are there any other advantages to the Rails approach? Or, is a 'git pull' approach actually more widely accepted?

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• Whats the best data-structure for storing 2-tuple (a, b) which support adding, deleting tuples and c

  - by bhups

  Hi So here is my problem. I want to store 2-tuple (key, val) and want to perform following operations: - keys are strings and values are Integers - multiple keys can have same value - adding new tuples - updating any key with new value (any new value or updated value is greater than the previous one, like timestamps) - fetching all the keys with values less than or greater than given value - deleting tuples. Hash seems to be the obvious choice for updating the key's value but then lookups via values will be going to take longer (O(n)). The other option is balanced binary search tree with key and value switched. So now lookups via values will be fast (O(lg(n))) but updating a key will take (O(n)). So is there any data-structure which can be used to address these issues? Thanks.

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