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• getting window screenshot windows API

  - by Oliver

  Hi, I am trying to make a program to work on top of an existing GUI to annotate it and provide extra calculations and statistical information. I want to do this using image recognition, as I have learned a fair amount about this in University using Matlab and similar things. I can get a handle to the window I want to perform image recognition on, but I don't know how to turn that handle into an image of that window, and all its visible child windows. I suppose I am looking for something like the screenshot function, but restricted to a single window. How would I go about doing this? I suppose I'd need something like a .bmp to mess about with. Also, it would have to be efficient enough that I could call it several times a second without my PC grinding to a halt. Hopefully this isn't an obvious question, I typed some things into google but didn't get anything related.

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• MAD method compression function

  - by Jacques

  I ran across the question below in an old exam. My answers just feels a bit short and inadequate. Any extra ideas I can look into or reasons I have overlooked would be great. Thanx Consider the MAD method compression function, mapping an object with hash code i to element [(3i + 7)mod9027]mod6000 of the 6000-element bucket array. Explain why this is a poor choice of compression function, and how it could be improved. I basically just say that the function could be improved by changing the value for p (or 9027) to an prime number and choosing an other constant for a (or 3) could also help.

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• Graphical net and text

  - by chesheerkys

  Hello! My task is to make a control, that behaves itself like RichTextBox, but contains a graphical net. The only task, this net is solving, is to be visible. It should be solution in overriding OnPaint method, but it doesn't. This code: protected override void OnPaint(System.Windows.Forms.PaintEventArgs e) { base.OnPaint(e); ...//drawing a line } gives me RichTextBox without of text This code: protected override void WndProc(ref System.Windows.Forms.Message m) { base.WndProc(ref m); if (m.Msg == 15) { Graphics g = this.CreateGraphics(); g.DrawLine(new Pen(Color.White, 1), new Point(0, 0), new Point(400, 400)); } } sometimes draws extra lines Actually since these two ways don't work, I don't know what to try. Waiting for your advices :) BR Dmitry P.S. I’ve heard a lot about great opportunities of WPF, but I’m not really common with this technology and don’t know what to start with. P.P.S. Sorry for my English, it’s not my natural language.

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• How to create windows form to display properly in all monitors?

  - by madhu bn

  I have created a windows form using (vs.net 2008 and vb.net as programming lanugage). Functionality part is working fine as expected. My issues is that, when i run my application in different machines, the form display is not proper accross the monitory screen. In some machines i noticed extra space on leftside of the container. In some other machine's it is vice versa. If you maximize or restore the form, the size varies. I tried to check the window form design on different machines using visual studio 2008, there also the form design looks differently. Please give me the solution to fix this issue. Thanks in advance.

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• How to create windows form to display properly in all monitors?

  - by Madhu

  I have created a windows form using (vs.net 2008 and vb.net as programming lanugage). Functionality part is working fine as expected. My issues is that, when i run my application in different machines, the form display is not proper accross the monitory screen. In some machines i noticed extra space on leftside of the container. In some other machine's it is vice versa. If you maximize or restore the form, the size varies. I tried to check the window form design on different machines using visual studio 2008, there also the form design looks differently. Please give me the solution to fix this issue. Thanks in advance.

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• Is there a way to make vim display "virtual characters" before/after regular patterns in the buffer?

  - by Laurence Gonsalves

  Vim has list and listchars options that make vim display "virtual characters" (by which I mean characters that aren't actually in the buffer) in certain situations. For example, you can make trailing spaces look like something else, or add a visible character to represent the newline character. I'd like to be able to enable the display of certain characters either before or after certain regular patterns ((perhaps syntax items). Sort of like syntax highlighting, but instead of just changing the color/styling of characters that are in the buffer, I'd like to display extra characters that aren't in the buffer. For example, I'd like to display a virtual : (colon) after all occurrences of the word "where" that appear at the end of a line. Is this possible, and if so, what is the necessary vimscript to do it?

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• Dynamically pixelate an html image element

  - by Chris Armstrong

  I'm to take an image on a webpage, and then use javascript (or whatever would be best suited) to dynamically 'pixelate' it (e.g. into 20px squares). Then, as the user scrolls down the page, I need the image to gradually increase in resolution, till it is no longer pixelated. Any ideas how I could go about doing this? I realise I could use php to resize an image and several times and just switch out the image, but that would require loading several extra images. Also, I know I could probably do the effect with flash & pixelbender, but I want to achieve it within the limitations of HTML5, CSS & Javascript if possible. Appreciate any thoughts!

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• What should the SQL keyword "ISABOUT" [deprecated?] be replaced with?

  - by Atomiton

  In MS SQL Full-text search, I'm using ISABOUT in my queries. For example, this should return the top 10 ProductIDs (PK) with a RANK Field in the ProductDetails Table SELECT * FROM CONTAINSTABLE( ProductDetails, *, ISABOUT("Nikon" WEIGHT (1.0), "Cameras" Weight(0.9)), 10 ) However, according to the SQL Documentation ISABOUT is deprecated. So, I have two questions: What is ISABOUT being replaced with? DO I even NEED any extra SQL Command there? ( IOW, would just putting the search phrase 'Nikon Cameras' be better? ) What I was originally trying to accomplish here was to weight the first word the highest, then the second word lower, and keep descending to 0.5 where I would just rank the remaining words at 0.5. My logic ( and perhaps it's flawed ) was that people's most relevant search words usually happen near the beginning of a phrase ( in English ). Am I going about this the wrong way? Is there a better way? Am I asking too many questions? (^_^) Thanks all for your time...

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• Is the single <form runat="server">-element requirement really necessary for ASP.NET WebForms?

  - by michielvoo

  Looking at some of the changes coming to WebForms in ASP.NET 4.0 I can see many improvements that give developers even more control over the output. Some of these improvement have been a long time coming, and for some time it seemed that it wasn't even possible. It made me wonder if the current model with the single form element that runs on the server is really the only possible way. Why couldn't the ASPNET WebForm architecture work with multiple forms that all run on the server? Imagine if you could architect this change. How would it impact the way we write codebehind today? Would it introduce extra complexity? Would it change the way event handlers work, or validation, or ASP.NET Ajax with the ScriptManager and UpdatePanel controls?

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• What is the fastest and best PHP IDE on Windows?

  - by vegatron

  I've tried a few PHP IDEs, but am still searching for the fastest one. All Java-based IDEs are too slow. I have 2 computers to work with: my home PC which is too fast, and my laptop which is good but can't handle heavy software. And I have to work on them both, so I'm looking for the best free IDE which is fast. I'm not talking about text editors, because I already have Notepad++ and it's great, but looking for extra features to help me save time. Any tips?

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• Many-to-Many Relationships in MySQL

  - by Kaji

  I've been reading up on foreign keys and joins recently, and have been pleasantly surprised that many of the basic concepts are things I'm already putting into practice. For example, with one project I'm currently working on, I'm organizing word lists, and have a table for the sets, like so: `words` Table `word_id` `headword` `category_id` `categories` Table `category_id` `category_name` Now, generally speaking this would be a one-to-many relationship, with several words being placed under a single category with the foreign key category_id. Let's assume for a moment, however, that a user chooses to add another category to a word, making it many-to-many—Is there a way to set up my words table to handle additional categories for words without creating extra columns like category_2, category_3, etc.?

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• How do you handle browser cache with login/logout?

  - by Julien

  To improve performances, I'd like to add a fairly long Cache-Control (up to 30 minutes) to each page since they do not change often. However, each page also displays the name of the user logged in (like this website). The problem is when the user logs in or logs out: the user name must change. How can I change the user name after each login/logout action while keeping a long Cache-Control? Here are the solutions I can think of: Ajax request (not cached) to retrieve and display the user name. If I have 2 requests (/user?registered and /user?new), they could be cached as well. But I am afraid this extra request would nullify my caching performance-wise Add a unique URL variable (?time=) to make the URL different, and cancel the cache. However, I would have to add this variable to all links on my webpage, not very convenient code-wise This problems becomes greater if I actually have more content that is not the same for registered users and new users.

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• Python Bitstream implementations

  - by Danielb

  I am writing a huffman implementation in Python as a learning exercise. I have got to the point of writing out my variable length huffman codes to a buffer (or file). Only to find there does not seem to be a bitstream class implemented by Python! I have had a look at the array and struct modules but they do not seem to do what I need without extra work. A bit of goggling turned up this bitstream implementation, which is more like what I am wanting. Is there really no comparable bitstream class in the Python standard library?

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• Detecting a image 404 in javascript.

  - by xal

  After a user uploads a file we have to do some additional processing with the images such as resizing and upload to S3. This can take up to 10 extra seconds. Obviously we do this in a background. However, we want to show the user the result page immediately and simply show spinners in place until the images arrive in their permanent home on s3. I'm looking for a way to detect that a certain image failed to load correctly (404) in a cross browser way. If that happens, we want to use JS to show a spinner in it's place and reload the image every few seconds until it can be successfully loaded from s3.

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• Is there a way to load a different cacerts than the one specified in the java_home/jre/lib/security

  - by feniix

  I have a single installation of java in a system that runs 2 or 3 applications. All the applications use the same runtime. Is there a way to specify a different keystores for the ca certs than the one in java_home/jre/lib/security. That is, is there an option to specify an "extra" keystore that is loaded and added to the certs loaded from java_home/jre/lib/security/cacerts? What I want to avoid is having to re-import our local ca every time I upgrade the jdk in the box.

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• download zip file using java?

  - by Mohamed

  I am downloading zip file from web server using Java but somehow I am loosing about 2kb in each file. I don't know why since same code works fine with other formats, e.g, text, mp3 and extra. any help is appreciated? here is my code. public void download_zip_file(String save_to) { try { URLConnection conn = this.url.openConnection(); conn.setDoOutput(true); conn.setDoInput(true); conn.setRequestProperty("content-type", "binary/data"); InputStream in = conn.getInputStream(); FileOutputStream out = new FileOutputStream(save_to + "tmp.zip"); byte[] b = new byte[1024]; int count; while ((count = in.read(b)) > 0) { out.write(b, 0, count); } out.close(); in.close(); } catch (IOException e) { e.printStackTrace(); } }

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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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• How to properly update a feature branch from trunk?

  - by Pavel Radzivilovsky

  SVN book says: ...Another way of thinking about this pattern is that your weekly sync of trunk to branch is analogous to running svn update in a working copy, while the final merge step is analogous to running svn commit from a working copy I find this approach very unpractical in large developments, for several reasons, mostly related to reintegration step. From SVN v1.5, merging is done rev-by-rev. Cherry-picking the areas to be merged would cause us to resolve the trunk-branch conflicts twice (one when merging trunk revisions to the FB, and once more when merging back). Repository size: trunk changes might be significant for a large code base, and copying the differences files (unlike SVN copy) from trunk elsewhere may be a significant overhead. Instead, we do what we call "re-branching". In this case, when a significant chunk of trunk changes is needed, a new feature branch is opened from current trunk, and the merge is always downward (Feature branches - trunk - stable branches). This does not go along SVN book guidelines and developers see it as extra pain. How do you handle this situation?

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• SelectedValue of DropDownList is not the one I selected when Enabled=false

  - by anD666

  Hiya, I have a few DropDownLists on a webform each pointing to a SqlDataSource. Some of these datasources use one of these DropDownLists for a select parameter, filtering the list to specific categories. For certain users two of these DropDownLists are to be automatically set and disabled. When I submit the form with the drop downs enabled it works fine but when they are disabled the SelectedValue of the DropDownList is being reset to the first one in the list. My DropDownLists are constructed as follows: <asp:DropDownList ID="ddlManager" runat="server" DataSourceID="dsManagers" EnableViewState="false" DataValueField="ManagerID" DataTextField="MgrName" AppendDataBoundItems="false" ondatabound="ddlManager_DataBound" > The drop down lists add an extra item on the data bound event as follows: protected void ddlManager_DataBound(object sender, EventArgs e) { this.ddlManager.Items.Insert(0, new ListItem("--Manager--", "--Manager--")); } Can anyone shed any light as to why this is happening? Thanks Andy

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• Probability distribution for sms answer delays

  - by Thomas Ahle

  I'm writing an app using sms as communication. I have chosen to subscribe to an sms-gateway, which provides me with an API for doing so. The API has functions for sending as well as pulling new messages. It does however not have any kind of push functionality. In order to do my queries most efficient, I'm seeking data on how long time people wait before they answer a text message - as a probability function. Extra info: The application is interactive (as can be), so I suppose the times will be pretty similar to real life human-human communication. I don't believe differences in personal style will play a big impact on the right times and frequencies to query, so average data should be fine.

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• How do i deploy UAT and Development SharePoint solution on the same server ?

  - by Nikhil Vaghela

  I am working on a SharePoint 2010 Server and i have following items in my SharePoint solution Couple of web parts State Machine Work flow (which will be integrated to an Infopath form library) Infopath task edit forms Lets say this solutions is deployed to http://[SharePoint201Server]:[PortNumber-x]/ This is the only server i have (No extra server for UAT), and what ever has been done so far needs to be given for user acceptance testing (UAT). I may create one more site at http://[SharePoint201Server]:[PortNumber-y]/ for it. My problme is that how do i maintain two copies of my source code ? I will have to continue development on the same set of source code for next UAT release. I simply can not create simple copies of the source code as it will have same Assembly name and feature id, etc..As if i do so, any changes on under Development source code would affect UAT assemblies. One thing i can do is to create seperate projects for UAT and Development with different Features and Assembly names, but is not that too much of an unneccesory work ? What can be the best approach in such situation ?

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• ALTER TABLE without locking the table?

  - by Daniel

  When doing an ALTER TABLE statement in MySQL, the whole table is read-locked for the duration of the statement. If it's a big table, that means insert or update statements could be locked for a looooong time. Is there a way to do a "hot alter", like adding a column in such a way that the table is still updatable throughout the process? Mostly I'm interested in a solution for MySQL but I'd be interested in other RDBMS if MySQL can't do it. To clarify, my purpose is simply to avoid downtime when a new feature that requires an extra table column is pushed to production. Any database schema will change over time, that's just a fact of life. I don't see why we should accept that these changes must inevitably result in downtime; that's just weak.

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• How do I flag only one of the formsets in django admin?

  - by azuer88

  I have these (simplified) models: class Question(models.Model): question = models.CharField(max_length=60) class Choices(models.Model): question = models.ForeignKey(Question) text = models.CharField(max_length=60) is_correct = models.BooleanField(default=False) I've made Choices as an inline of Question (in admin). Is there a way to make sure that only one Choice will have is_correct = True? Ideally, is_correct will be displayed as a radio button when it is displayed in the admin formset (TabularInline). my admin.py has: from django.contrib import admin class OptionInline(admin.TabularInline): model = Option extra = 5 max_num = 5 class QuestionAdmin(admin.ModelAdmin): inlines = [OptionInline, ] admin.site.register(QType) admin.site.register(Question, QuestionAdmin)

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• Is release without prior retain dangerous?

  - by BankStrong

  I have some code which I think has extra release statements. Is the code incorrect? What is the end result? I don't understand memory management well yet - even after reading lots of articles and stackoverflow answers. Thanks for straightening me out. NSMutableArray *points = [NSMutableArray new]; for (Segment *s in currentWorkout.segments) { [points addObjectsFromArray:[s.track locationPoints]]; } [routeMap update:points]; [points release];

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• MySQL - How To Avoid Repair With Keycache?

  - by dvancouver

  I have had some experience with optimizing the my.cnf file but my database has around 4 million records (MyISAM). I am trying to restore from a mysqldump but every time I do I eventually get the dreaded "Repair With Keycache", that may take days. Is there anyway to get past this and let it roll as "Repair By Sorting"? I have 2GB RAM, Dual Cores, lots of extra hard-drive space. Snip out of my.cnf: set-variable = max_connections=650 set-variable = key_buffer=256M set-variable = myisam_sort_buffer_size=64M set-variable = join_buffer=1M set-variable = record_buffer=1M set-variable = sort_buffer_size=2M set-variable = read_buffer_size=2M set-variable = query_cache_size=32M set-variable = table_cache=1024 set-variable = thread_cache_size=256 set-variable = wait_timeout=7200 set-variable = connect_timeout=10 set-variable = max_allowed_packet=16M set-variable = max_connect_errors=10 set-variable = thread_concurrency=8

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