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  • C# Reflection StackTrack get value

    - by John
    I'm making pretty heavy use of reflection in my current project to greatly simplify communication between my controllers and the wcf services. What I want to do now is to obtain a value from the Session within an object that has no direct access to HttpSessionStateBase (IE: Not a controller). For example, a ViewModel. I could pass it in or pass a reference to it etc. but that is not optimal in my situation. Since everything comes from a Controller at some point in my scenario I can do the following to walk the sack to the controller where the call originated, pretty simple stuff: var trace = new System.Diagnostics.StackTrace(); foreach (var frame in trace.GetFrames()) { var type = frame.GetMethod().DeclaringType; var prop = type.GetProperty("Session"); if(prop != null) { // not sure about this part... var value = prop.GetValue(type, null); break; } } The trouble here is that I can't seem to work out how to get the "instance" of the controller or the Session property so that I can read from it.

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  • Hiding What Site You're On (Branding Issues)

    - by John
    Here's the scenario: I have a private site that, once logged on, will display different information depending on the attributes of your account: the pages are branded differently based upon what company you are associated with. The problem is the companies linking to this site want everything to be displayed as their own brand, and do not want to see my brand anywhere, especially in the URL (i.e. from www.theirbrand.com they do not want to have links to www.mybrand.com). Is there an elegant solution to this? Is the best option to add a page on www.theirbrand.com that contains an iframe with a source of www.mybrand.com (I'm not sure if that would interfere with back/forward navigation, etc), or is there a better way?

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  • Is map/collection order stable between calls?

    - by John
    If I have a hash map and iterate over the objects repeatedly, is it correct that I'm not guaranteed the same order for every call? For example, could the following print two lines that differ from each other: Map<String,Integer> map = new HashMap<String,Integer>() {{ put("a", 1); put("b", 2); put("c", 3); }}; System.out.println(map); System.out.println(map); And is this the case for sets and collections in general? If so, what's the best way in case you have to iterate twice over the same collection in the same order (regardless of what order that is)? I guess converting to a list.

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  • Can the Browser 'Forward' Button be Set from HTML?

    - by John C
    Example: At the bottom of the StackOver Questions page are a bunch of page numbers (1,2,3...), enclosed in a set of prev and next buttons. Clicking next repeatedly will bring me to, say page 5, at which point I will have: The page's prev button will be set to 'http://stackoverflow.com/questions?page=4' The Back button on my Browser will have the same value. The page's next button will be set to 'http://stackoverflow.com/questions?page=6' The Forward button on my Browser - won't be set to anything. Obviously, if I hit the Back button on the Browser, then Forward will have a value, pointing to the URL for page 5 - but not otherwise. Is there any way, from HTML (plus Javascript), to set the value of the Browser's Forward button? Or is this one of those things that HTML is simply forbidden to do?

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  • How can I combine a LINQ query with an IQueryable<Guid>

    - by John
    I have a LINQ query that uses 1 table + a large number of views. I'd like to be able to write something like this: IQueryable<Guid> mostViewedWriters; switch (datePicker) { case DatePicker.Last12Hours: mostViewedWriters = from x in context.tempMostViewed12Hours select x.GuidId; break; case DatePicker.Last24Hours: mostViewedWriters = from x in context.tempMostViewed12Hours select x.GuidId; break; case DatePicker.Last36Hours: mostViewedWriters = from x in context.tempMostViewed12Hours select x.GuidId; break; } var query = from x1 in context.Articles join x2 in context.Authors on x1.AuthorId == x2.AuthorId join x3 in mostViewedWriters on x2.AuthorId == x3.Id select new { x2.AuthorName, x1.ArticleId, x1.ArticleTitle }; The above C# is pseudo-code written to protect the innocent (me). The gist of the question is this: I have a query that is related to the results of a view. That view, however, could be one of many different views. All the views return the same data type. I thought that I might be able to create an IQueryable that would contain the Ids that I need and use that query. Alas, that effort has stalled.

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  • Wordpress Re-usable Custom Widget

    - by John
    I created a custom widget for wordpress. But I can only use it once. I can't assign multiple instances of the widget to my sidebars. Can anyone show me sample code on how to make my custom widgets re-useable?

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  • c++: what is a good idea for a list of strings?

    - by John
    I simply want to build an RPG and make it as neat as possible, I wish to define a pile of strings which I may want to edit later, so I tried something like this: enum {MSG_INIT = "Welcome to ...", MSG_FOO = "bar"}; But I just get errors, such as that MSG_INIT is not an integer! Why must it not be a string, are that what enums are only for? What do you think is the best way to define a pile of strings? In a struct called msg or something? I'm kinda new to all this so I'd really appreciate small examples.

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  • When to give in and start The Big Rewrite?

    - by John Cromartie
    I've had my share of projects where the first thing I think is "let's just rewrite it in ." Everybody feels the urge at some point. In fact, I think I've had the urge to rewrite pretty much every project I've ever been on. However, it is accepted wisdom that a total rewrite is generally a bad idea. The question is: when do you look at a project and say: "OK, it's time to start over." What sort of metrics or examples can you cite of where a rewrite was truly necessary? How bad does the code have to be? How old can a project get before there too much invested?

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  • Creating a C# DLL and using it from unmanaged C++

    - by John
    I have a native (unmanaged) C++ application (using wxWidgets for what it's worth). I'm considering a separate tool application to be written in C# which would contain winform-based dialogs. putting some of those dialogs in a separate DLL would be useful as I'd hope to be able to use them from my C++ app. But I have no idea how much messing about is needed to accomplish this, is it particularly easy?

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  • Looking for a jquery plugin to serialize a form to an object

    - by John
    I'm looking for a jQuery function or plugin that serializes form inputs to an object using the naming convention for deep-serialization supported by param() in jQuery 1.4: <form> <input name="a[b]" value="1"/> <input name="a[c]" value="2"/> <input name="d[]" value="3"/> <input name="d[]" value="4"/> <input name="d[2][e]" value="5"/> </form> $('form').serializeObject(); // { a: { b:1,c:2 }, d: [3,4,{ e:5 }] } Prototype's Form.serialize method can do exactly this. What's the jQuery equivalent? I found this plugin but it doesn't follow this naming convention.

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  • django convert list of objects to list of primary keys

    - by John
    Hi, As the title says I have a list of Django objects and I want to get a list of primary keys. What is the best way of doing this? I know I could do my_list = [] for item in object_list: my_list.append(item.pk) but was wondering if there is Django or Python specific way of doing this better. Thanks

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  • KineticJS issue with repeatable mouse event

    - by nuclearpeace
    I have noob issue here (i obviously missing something). I simplified it from my bigger application: When i click blue rectangle, i add another layer to the stage that includes red rectangle (clickable), when i clik this red rectangle it removes second layer with red rect. Problem: When i click blue rect second time, nothing happens :( i.e. app works only once, and i need to add/remove second layer(with red rect) repeatedly. What's wrong? :) You can see it here, Fiddle http://jsfiddle.net/mAX8r/ Code: <!DOCTYPE HTML> <html> <head> <style> body { margin: 0px; padding: 0px; } canvas { border: 1px solid #9C9898; } </style> <script src="http://www.html5canvastutorials.com/libraries/kinetic-v4.0.3.js"> </script> <script> window.onload = function() { var stage = new Kinetic.Stage({ container: 'container', width: 578, height: 200 }); var layerBlue = new Kinetic.Layer(); var layerRed = new Kinetic.Layer(); var rectBlue = new Kinetic.Rect({ x: 100, y: 75, width: 100, height: 50, fill: 'blue', stroke: 'black', strokeWidth: 4 }); var rectRed = new Kinetic.Rect({ x: 300, y: 75, width: 100, height: 50, fill: 'red', stroke: 'black', strokeWidth: 4 }); // mouse events rectBlue.on('click', function() { stage.add(layerRed); stage.draw(); }); rectRed.on('click', function() { layerRed.remove(); stage.draw(); }); // add the shape to the layer layerBlue.add(rectBlue); layerRed.add(rectRed); // add the layer to the stage stage.add(layerBlue); }; </script> </head> <body> <div id="container"></div> </body> </html>

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  • Extending struts 2 "property" data tag

    - by John B.
    Hi, We are currently developing a project with Struts2. We have a module on which we display a large amount of data on read-only fields from a group of beans via the "property" Struts 2 data tag (i.e. <s:property value="aBeanProperty" /) on a jsp file. In some cases most of the fields might come empty, so a blank is being displayed on screen. Our customer is now requesting us to display default string (i.e. "N/A") whenever a property comes empty, so that it is displayed in place of the blank spaces currently shown. We are looking for a way to achieve this in a clean and maintainable way. The 'property' tag comes with a 'default' attribute on which one can define a default value in cases when the accessed property comes as null. However, most of our properties are empty strings, therefore it does not work in our case. Another solution we are thinking of is to define a base class for all of our beans, and define a util method which will validate if a string is null or empty and then return the default value. Then we would call this method from each bean getter. And yes this would be tiresome and kind of ugly :), therefore we are holding out on this one in case of a better solution. Now, we have in mind a solution which we think would be the best but have not had luck on how implement it. We are planning on extending the 'property' tag some way, defining a new 'default' attribute so that besides working on null properties, it also do so on empty strings ("", " ", etc). Therefore we would only need to replace the original s:property tag with our new custom tag, and the desired result would be achieved without touching java code. Do you have an idea on how to do this? Also, any other clever solution (maybe some sort of design pattern?) on how to default the values of a large amount of property beans are welcome too! (Or maybe, even there might be some tag that does this already in Struts2??) Thanks in advance.

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  • Efficient method of finding database rows that have *one or more* qualities from a list of seven qualities

    - by hithere
    Hello! For this question, I'm looking to see if anyone has a better idea of how to implement what I'm currently planning on implementing (below): I'm keeping track of a set of images, using a database. Each image is represented by one row. I want to be able to search for images, using a number of different search parameters. One of these parameters involves a search-by-color option. (The rest of the search stuff is currently working fine.) Images in this database can contain up to seven colors: -Red -Orange -Yellow -Green -Blue -Indigo -Violet Here are some example user queries: "I want an image that contains red." "I want an image that contains red and blue." "I want an image that contains yellow and violet." "I want an image that contains red, orange, yellow, green, blue, indigo and violet." And so on. Users make this selection through the use of checkboxes in an html form. They can check zero checkboxes, all seven, and anything in between. I'm curious to hear what people think would be the most efficient way to perform this database search. I have two possible options right now, but I feel like there must be something better that I'm not thinking of. (Option 1) -For each row, simply have seven additional fields in the database, one for each color. Each field holds a 1 or 0 (true/false) value, and I SELECT based on whatever the user has checked off. (I didn't like this solution so much, because it seemed kind of wasteful to add seven additional fields...especially since most pictures in this table will only have 3-4 colors max, though some could have up to 7. So that means I'm storing a lot of zeros.) Also, if I added more searchable colors later on (which I don't think I will, but it's always possible), I'd have to add more fields. (Option 2) -For each image row, I could have a "colors" text field that stores space-separated color names (or numbers for the sake of compactness). Then I could do a fulltext match against search through the fields, selecting rows that contain "red yellow green" (or "1 3 4"). But I kind of didn't want to do fulltext searching because I already allow a keyword search, and I didn't really want to do two fulltext searches per image search. Plus, if the database gets big, fulltext stuff might slow down. Any better options that I didn't think of? Thanks! Side Note: I'm using PHP to work with a MySQL database.

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  • Do Distributed Version Control Systems promote poor backup habits?

    - by John
    In a DVCS, each developer has an entire repository on their workstation, to which they can commit all their changes. Then they can merge their repo with someone else's, or clone it, or whatever (as I understand it, I'm not a DVCS user). To me that flags a side-effect, of being more vulnerable to forgetting to backup. In a traditional centralised system, both you as a developer and the people in charge know that if you commit something, it's held on a central server which can have decent backup solutions in place. But using a DVCS, it seems you only have to push your work to a server when you feel like sharing it. It's all very well you have the repo locally so you can work on your feature branch for a month without bothering anyone, but it means (I think) that checking in your code to the repo is not enough, you have to remember to do regular pushes to a backed-up server. It also means, doesn't it, that a team lead can't see all those nice SVN commit emails to keep a rough idea what's going on in the code-base? Is any of this a real issue?

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  • Errors with parameter datatype in PostgreSql query

    - by John
    Im trying to execute a query to postgresql using the following code. It's written in C/C++ and I keep getting the following error when declaring a cursor: DECLARE CURSOR failed: ERROR: could not determine data type of parameter $1 Searching on here and on google, I can't find a solution. Can anyone find where I have made and error and why this is happening? thanks! void searchdb( PGconn *conn, char* name, char* offset ) { // Will hold the number of field in table int nFields; // Start a transaction block PGresult *res = PQexec(conn, "BEGIN"); if (PQresultStatus(res) != PGRES_COMMAND_OK) { printf("BEGIN command failed: %s", PQerrorMessage(conn)); PQclear(res); exit_nicely(conn); } // Clear result PQclear(res); printf("BEGIN command - OK\n"); //set the values to use const char *values[3] = {(char*)name, (char*)RESULTS_LIMIT, (char*)offset}; //calculate the lengths of each of the values int lengths[3] = {strlen((char*)name), sizeof(RESULTS_LIMIT), sizeof(offset)}; //state which parameters are binary int binary[3] = {0, 0, 1}; res = PQexecParams(conn, "DECLARE emprec CURSOR for SELECT name, id, 'Events' as source FROM events_basic WHERE name LIKE '$1::varchar%' UNION ALL " " SELECT name, fsq_id, 'Venues' as source FROM venues_cache WHERE name LIKE '$1::varchar%' UNION ALL " " SELECT name, geo_id, 'Cities' as source FROM static_cities WHERE name LIKE '$1::varchar%' OR FIND_IN_SET('$1::varchar%', alternate_names) != 0 LIMIT $2::int4 OFFSET $3::int4", 3, //number of parameters NULL, //ignore the Oid field values, //values to substitute $1 and $2 lengths, //the lengths, in bytes, of each of the parameter values binary, //whether the values are binary or not 0); //we want the result in text format // Fetch rows from table if (PQresultStatus(res) != PGRES_COMMAND_OK) { printf("DECLARE CURSOR failed: %s", PQerrorMessage(conn)); PQclear(res); exit_nicely(conn); } // Clear result PQclear(res); res = PQexec(conn, "FETCH ALL in emprec"); if (PQresultStatus(res) != PGRES_TUPLES_OK) { printf("FETCH ALL failed"); PQclear(res); exit_nicely(conn); } // Get the field name nFields = PQnfields(res); // Prepare the header with table field name printf("\nFetch record:"); printf("\n********************************************************************\n"); for (int i = 0; i < nFields; i++) printf("%-30s", PQfname(res, i)); printf("\n********************************************************************\n"); // Next, print out the record for each row for (int i = 0; i < PQntuples(res); i++) { for (int j = 0; j < nFields; j++) printf("%-30s", PQgetvalue(res, i, j)); printf("\n"); } PQclear(res); // Close the emprec res = PQexec(conn, "CLOSE emprec"); PQclear(res); // End the transaction res = PQexec(conn, "END"); // Clear result PQclear(res); }

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  • Display x if x display y if y (bad title I know)

    - by user1914940
    Ok so after reading the title you are most likely like...what? Ok, so I have a jquery code that displays input box if an item with prefix Blue from dropdown menu is selected. Code: $(function() { $('#text1').hide(); $('#select2').on('change', function(event) { var opt = this.options[ this.selectedIndex ]; var picked_blue = $(opt).text().match(/Blue/i); if(picked_blue) { $('#text1').show(); } else { $('#text1').hide(); } }); }); But what I also need to add is to display something else if any other item from dropdown menu is selected.

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