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  • How to show jQuery is working/waiting/loading ?

    - by Kim
    How do I show a loading picture and/or message to the user ? If possible, would I like to know how to make it full screen with grey-dimmed background. Kinda like when viewing the large picture from some galleries (sorry, no example link). Currently do I add a CSS class which has the image and other formating, but its not working for some reason. Results from the search do get inserted into the div. HTML <div id="searchresults"></div> CSS div.loading { background-image: url('../img/loading.gif'); background-position: center; width: 80px; height: 80px; } JS $(document).ready(function(){ $('#searchform').submit(function(){ $('#searchresults').addClass('loading'); $.post('search.php', $('#'+this.id).serialize(),function(result){ $('#searchresults').html(result); }); $('#searchresults').removeClass('loading'); return false; }); });

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  • How-to display a .gif as background image?

    - by Vito De Tullio
    Hi! I have a javascript "loading" function like this: function splashScreen() { var div = document.createElement('div'); div.appendChild(document.createTextNode("some text")); div.setAttribute("style", "position: fixed; " + "width: 100%; height: 100%; " + "left: 0; top: 0; " + "z-index: 1000; " + "background: #fff url('img/loading.gif') no-repeat center; " + "font-size: x-large; " + "text-align: center; " + "line-height: 3em; " + "opacity: 0.75; " + "filter: alpha(opacity=75); "); document.getElementsByTagName('body')[0].appendChild(div); return true; } I use this function in the form action (onsubmit="return splashScreen()") to show a "rotating logo" while the next page load... The problem is in that "img/loading.gif" and safari (on winXP): in ff and ie I have no problems, and I clearly see the animated gif. In safari I can't see it. If I change the image with a (obviously static) png the image appears... Am I doing something wrong? What's the problem with safari?

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  • C#- move a shape to a point which is half way from the top of the form

    - by hello-all
    Hello all, Here I have to create a diamond using drawlines method and make it move horizontally along a path that is half way from the top of the form. I created a diamond and it is moving horizontally, but i want it to start moving from a position which is half way from the top of the form. This is the code to create a diamond, private void Form1_Paint(object sender, PaintEventArgs e) { Graphics g = e.Graphics; Point p1 = new Point(5+x, 0); Point p2 = new Point(10+x, 5); Point p3 = new Point(5+x, 10); Point p4 = new Point(0+x, 5); Point[] ps = { p1, p2, p3, p4, p1 }; Pen p_yellow = new Pen(Color.Yellow, 5); g.DrawLines(p_yellow, ps); this.BackColor = System.Drawing.Color.DarkBlue; } I can make it move using the timer and following is the code, private void timer1_Tick(object sender, EventArgs e) { if (x < 500) x += 2; else timer1.Enabled = false; this.Invalidate(); } please tell me how to bring the diamond to a point which is half way from the top of the form?

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  • jQuery: On form input focus, show div. hide div on blur (with a caveat)

    - by Lyon
    Hi, I am able to make a hidden div show/hide when an input field is in focus/blur using the following code: $('#example').focus(function() { $('div.example').css('display','block'); }).blur(function() { $('div.example').fadeOut('medium'); }); The problem is I want div.example to continue to be visible when the user is interacting within this div. E.g. click, or highlighting the text etc. within div.example. However div.example fades out whenever the input is not in focus and the mouse is interacting with elements within the div. The html code for the input and div elements is as follows: <p> <label for="example">Text:</label> <input id="example" name="example" type="text" maxlength="100" /> <div class="example">Some text...<br /><br />More text...</div> </p> How do I make it such that the div.example only disappears when the user clicks outside the input and/or div.example? I tried experimenting with focusin/focusout to check the focus on <p> but that didn't work either. Would it matter that div.example is positioned directly below the input field #example using jQuery? The code that does that is as follows: var fieldExample = $('#example'); $('div.example').css("position","absolute"); $('div.example').css("left", fieldExample.offset().left); $('div.example').css("top", fieldExample.offset().top + fieldExample.outerHeight()); My apologies if this has been asked before, but the many show/hide div questions I read does not cover this. Thanks for your advice. :)

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  • Stretch Background Image & Resize With Browser Window

    - by user241673
    I am trying to replicate the image resizing found at http://devkick.com/lab/fsgallery/ but with the code I have below, it is not working properly. When resizing the browser window to have small width and big height, white space shows up at the bottom of the page. feel free to see it & edit at http://jsbin.com/ifolu3 The CSS: html, body {width:100%; height:100%; overflow:hidden;} div.bg {position:absolute; width:200%; height:200%; top:-50%; left:-50%;} img.bg {min-height:50%; min-width:50%; margin:0 auto; display:block;} The JS/jQuery: $(window).resize(function(){ var ratio = Math.max($(window).width()/$('img.bg').width(),$(window).height()/$('img.bg').height()); if ($(window).width() $(window).height()) { $('img.bg').css({width:image.width()*ratio,height:'auto'}); } else { $('img.bg').css({width:'auto',height:image.height()*ratio}); } }); The HTML - (sorry for the formatting, had trouble getting "<" to show) [body] [div class="bg"] [img class="bg" src="bg.jpg" /] [/div] [/body]

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  • How do you make a static sprite be a child of another sprite in cocos2D while using SpaceManager

    - by JJBigThoughts
    I have two static (STATIC_MASS) SpaceManager sprites. One is a child of the other - by which I mean that one sort of builds up the other one, but although the child's images shows up in the right place, the child doesn't seem to exists in the chipmunk physics engine, like I would expect. In my case, I have a backboard (rectangular sprite) and a hoop (a circular sprite). Since I might want to move the backboard, I'd like to attach the hoop to backboard so that the hoop automatically moves right along with the backboard. Here, we see a rotating backboard with attached hoop. It looks OK on the screen, but other objects only bounce off the backboard but pass right through the hoop (in a bad sense of the term). What doesn't my child sprite seem to exist in the physics engine? // Add Backboard cpShape *shapeRect = [smgr addRectAt:cpvWinCenter mass:STATIC_MASS width:200 height:10 rotation:0.0f ];// We're upgrading this cpCCSprite * cccrsRect = [cpCCSprite spriteWithShape:shapeRect file:@"rect_200x10.png"]; [self addChild:cccrsRect]; // Spin the static backboard: http://stackoverflow.com/questions/2691589/how-do-you-make-a-sprite-rotate-in-cocos2d-while-using-spacemanager // Make static object update moves in chipmunk // Since Backboard is static, and since we're going to move it, it needs to know about spacemanager so its position gets updated inside chipmunk. // Setting this would make the smgr recalculate all static shapes positions every step // cccrsRect.integrationDt = smgr.constantDt; // cccrsRect.spaceManager = smgr; // Alternative method: smgr.rehashStaticEveryStep = YES; smgr.rehashStaticEveryStep = YES; // Spin the backboard [cccrsRect runAction:[CCRepeatForever actionWithAction: [CCSequence actions: [CCRotateTo actionWithDuration:2 angle:180], [CCRotateTo actionWithDuration:2 angle:360], nil] ]]; // Add the hoop cpShape *shapeHoop = [smgr addCircleAt:ccp(100,-45) mass:STATIC_MASS radius: 50 ]; cpCCSprite * cccrsHoop = [cpCCSprite spriteWithShape:shapeHoop file:@"hoop_100x100.png"]; [cccrsRect addChild:cccrsHoop]; This is only half working for me. Note: SpaceManager is a toolkit for working with cocos2D-iphone

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  • CSS Multiple multi-column divs

    - by accelerate
    I have a bunch of items (text, image, mixed content, etc) that I want to display. The user can define what row and what column that item appears in. For example, in row 1, there could be two items/columns, both images. In row two, there could be three items / columns, one with an image, two others as pure text. Oh, and the user may specify the width of any particular column/image/item. I have a solution that uses multiple tables that works. In essence, each row is a new table. This works for the most part. I'm wondering if I can use just divs? Now my CSS foo is lacking, and I tried to copy examples from the web, and I haven't been able to get it working. Right now I have something like this: `[for each row] [for each column] [content] ` But everything is overlapping each other. I've also tried using "position: relative", but things look even more borked. So can divs actually be used for multiple rows and different number of columns?

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  • IE not rendering div contents

    - by The.Anti.9
    I've written an app using HTML 5 and I wan't to show an error box instead of the page when someone visits from IE. When it detects navigator.appName as Microsoft Internet Explorer it hides everything and shows the error div that started out hidden. The div is as follows: <div id='ieerror' style='display:none;width:500px;height:500px;border:3px solid #ff0000;position:absolute;top:50%;left:50%;margin-top:-250px;margin-left:-250px;'> <center> <h1 style='font-size: 30px;'>Internet Explorer is not supported by Aud!</h1><br /><br /> <p>Internet Explorer does not support HTML 5 and therefore this application cannot run.<br /> Please upgrade your browser. We suggest <a href='http://www.google.com/chrome'>Google Chrome</a>!</p> </center> </div> The problem is that when I visit the page in IE, the div pops up with the border, but it has no contents. Nothing is inside of it. I went to view->source and looked at it, and the code is still there, but none of it is rendered. How do I fix this?

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  • I'm looking for a way to evaluate reading rate in several languages

    - by i30817
    I have a software that is page oriented instead of scrollbar oriented so i can easily count the words, but i'd like a way to filter outliers and some default value for the text language (that is known). The goal is from the remaining text to calculate the remaining time. I'm not sure what is the best unit to use. WPM (words per minute) from here seems very fuzzy and human oriented. Besides i don't know how many "words" remain in the text. http://www.sfsu.edu/~testing/CalReadRate.htm So i came up with this: The user is reading the text. The total text size in characters is known. His position in the text is known. So the remaining characters to read is also known. If a language has a median word length of say 5 chars, then if i had a WPM speed for the user, i could calculate the remaining time. 3 things are needed for this: 1) A table of the median word length of the language. 2) A table of the median WPM of a median user per language. 3) Update the WPM to fit the user as data becomes available, filtering outliers. However i can't find these tables. And i'm not sure how precise it is assuming median word length.

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  • Prevent TEXTAREAs scroll by themselves on IE8

    - by Justin Grant
    IE8 has a known bug (per connect.microsoft.com) where typing or pasting text into a TEXTAREA element will cause the textarea to scroll by itself. This is hugely annoying and shows up in many community sites, including Wikipedia. The repro is this: open the HTML below with IE8 (or use any long page on wikipedia which will exhibit the same problem until they fix it) size the browser full-screen paste a few pages of text into the TEXTAREA move the scrollbar to the middle position now type one character into the textarea Expected: nothing happens Actual: scrossing happens on its own, and the insertion point ends up near the bottom of the textarea! Below is repro HTML (can also see this live on the web here: http://en.wikipedia.org/w/index.php?title=Text_box&action=edit) <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <body> <div style="width: 80%"> <textarea rows="20" cols="80" style="width:100%;" ></textarea> </div> </body> </html>

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  • Where to post code for open source usage?

    - by Douglas
    I've been working for a few weeks now with the Google Maps API v3, and have done a good bit of development for the map I've been creating. Some of the things I've done have had to be done to add usability where there previously was not any, at least not that I could find online. Essentially, I made a list of what had to be done, searched all over the web for the ways to do what I needed, and found that some were not(at the time) possible(in the "grab an example off the web" sense). Thus, in my working on this map, I have created a number of very useful tools, which I would like to share with the development community. Is there anywhere I could use as a hub, apart from my portfolio ( http://dougglover.com ), to allow people to view and recycle my work? I know how hard it can be to need to do something, and be unable to find the solution elsewhere, and I don't think that if something has been done before, it should necessarily need to be written again and again. Hence open source code, right? Firstly, I was considering coming on here and asking a question, and then just answering it. Problem there is I assume that would just look like a big reputation grab. If not, please let me know and I'll go ahead and do that so people here can see it. Other suggestions appreciated. Some stuff I've made: A (new and improved) LatLng generator Works quicker, generates LatLng based on position of a draggable marker Allows searching for an address to place the marker on/near the desired location(much better than having to scroll to your location all the way from Siberia) Since it's a draggable marker, double-clicking zooms in, instead of creating a new LatLng marker like the one I was originally using The ability to create entirely custom "Smart Paths" Plot LatLng points on the map which connect to each other just like they do using the actual Google Maps Using Dijkstra's algorithm with Javascript, the routing is intelligent and always gives the shortest possible route, using the points provided Simple, easy to read multi-dimensional array system allows for easily adding new points to the grid Any suggestions, etc. appreciated.

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  • VS2010 renders controls JS awkwardly

    - by Juergen Hoffmann
    I have created a Website Project in VS2010. My Controls are not rendered correctly. The JS that is produced is not correctly formatted. Here is an example: protected void Page_PreRender(object sender, EventArgs e) { if (!IsPostBack) { objListBox.Attributes.Add("onchange", "Control_doPostBack('" + objListBox.ClientID + "','ListBox_OnClick'); return false;"); objListBox.Attributes.Add("onblur", "Control_doPostBack('" + trListbox.ClientID + "','ListBox_OnBlur'); return false;"); img.Attributes.Add("onclick", "Control_doPostBack('" + trListbox.ClientID + "','IMG_OnClick'); return false;"); } } and the responding control is rendered as: <select size="4" name="ctl00$PlaceHolder_Content$drop$objListBox" onchange="Control_doPostBack(&#39;PlaceHolder_Content_drop_objListBox&#39;,&#39;ListBox_OnClick&#39;); return false;setTimeout(&#39;__doPostBack(\&#39;ctl00$PlaceHolder_Content$drop$objListBox\&#39;,\&#39;\&#39;)&#39;, 0)" id="PlaceHolder_Content_drop_objListBox" onblur="Control_doPostBack(&#39;PlaceHolder_Content_drop_trListbox&#39;,&#39;ListBox_OnBlur&#39;); return false;" style="position:absolute;"> </select> As you can see, the ' are rendered to &#39 which screwes up the Browser. Is there a tweak to msbuild or inside the project properties? Any help is highly appreciated.

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  • image appears larger than bounding rectangle?

    - by Kildareflare
    Hello I'm implementing a custom print preview control. One of the objects it needs to display is an image which can be several pages high and wide. I've successfully divided the image into pages and displayed them in the correct order. Each "page" is drawn within the marginbounds. (That is, each page is sized to be the same as the marginBounds.) The problem I have is that the image the page represents exceeds the bottom margin. However if I draw a rectangle with the same dimensions as the image, at the same position as the image, the rectangle matches the marginbounds. Thus when drawn to the page (in print preview and printed page) the image is larger than a rectangle drawn based on the image dimensions. I.e. The image is drawn at the same size as e.MarignBounds and is drawn at e.MarginBounds.Location yet exceeds the bottom margin. How is this? I've checked resoutions at each step of the process and they are all 96DPI. //... private List<Image> m_printImages = new List<Image>(); //... private void ImagePrintDocument_PrintPage(object sender, PrintPageEventArgs e) { PrepareImageForPrinting(e); e.Graphics.DrawImage(m_printImages[m_currentPage], new Point(e.MarginBounds.X, e.MarginBounds.Y); e.Graphics.DrawRectangle(new Pen(Color.Blue, 1.0F), new Rectangle( new Point(e.MarginBounds.X, e.MarginBounds.Y), new Size(m_printImages[m_currentPage].Width, m_printImages[m_currentPage].Height))); //rest of handler } PS Not able to show an image as free image hosting blocked here.

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  • What is the scope of TRANSACTION in Sql server

    - by Shantanu Gupta
    I was creating a stored procedure and i got stuck in the writing methodology of me and my collegue. I am using SQL Server 2005 I was writing Stored procedure like this BEGIN TRAN BEGIN TRY INSERT INTO Tags.tblTopic (Topic, TopicCode, Description) VALUES(@Topic, @TopicCode, @Description) INSERT INTO Tags.tblSubjectTopic (SubjectId, TopicId) VALUES(@SubjectId, @@IDENTITY) COMMIT TRAN END TRY BEGIN CATCH DECLARE @Error VARCHAR(1000) SET @Error= 'ERROR NO : '+ERROR_NUMBER() + ', LINE NO : '+ ERROR_LINE() + ', ERROR MESSAGE : '+ERROR_MESSAGE() PRINT @Error ROLLBACK TRAN END CATCH And my collegue was writing it like the below one BEGIN TRY BEGIN TRAN INSERT INTO Tags.tblTopic (Topic, TopicCode, Description) VALUES(@Topic, @TopicCode, @Description) INSERT INTO Tags.tblSubjectTopic (SubjectId, TopicId) VALUES(@SubjectId, @@IDENTITY) COMMIT TRAN END TRY BEGIN CATCH DECLARE @Error VARCHAR(1000) SET @Error= 'ERROR NO : '+ERROR_NUMBER() + ', LINE NO : '+ ERROR_LINE() + ', ERROR MESSAGE : '+ERROR_MESSAGE() PRINT @Error ROLLBACK TRAN END CATCH Here the only difference that you will find is the position of writing Begin TRAN. According to me the methodology of my collegue should not work when an exception occurs i.e. Rollback should not get executed because TRAN does'nt have scope. But when i tried to run both the code, both was working in the same way. I am confused to know how does TRANSACTION works. Is it scope free or what ?

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  • C++ interpreter conceptual problem

    - by Jan Wilkins
    I've built an interpreter in C++ for a language created by me. One main problem in the design was that I had two different types in the language: number and string. So I have to pass around a struct like: class myInterpreterValue { myInterpreterType type; int intValue; string strValue; } Objects of this class are passed around million times a second during e.g.: a countdown loop in my language. Profiling pointed out: 85% of the performance is eaten by the allocation function of the string template. This is pretty clear to me: My interpreter has bad design and doesn't use pointers enough. Yet, I don't have an option: I can't use pointers in most cases as I just have to make copies. How to do something against this? Is a class like this a better idea? vector<string> strTable; vector<int> intTable; class myInterpreterValue { myInterpreterType type; int locationInTable; } So the class only knows what type it represents and the position in the table This however again has disadvantages: I'd have to add temporary values to the string/int vector table and then remove them again, this would eat a lot of performance again. Help, how do interpreters of languages like Python or Ruby do that? They somehow need a struct that represents a value in the language like something that can either be int or string.

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  • Display a ranking grid for game : optimization of left outer join and find a player

    - by Jerome C.
    Hello, I want to do a ranking grid. I have a table with different values indexed by a key: Table SimpleValue : key varchar, value int, playerId int I have a player which have several SimpleValue. Table Player: id int, nickname varchar Now imagine these records: SimpleValue: Key value playerId for 1 1 int 2 1 agi 2 1 lvl 5 1 for 6 2 int 3 2 agi 1 2 lvl 4 2 Player: id nickname 1 Bob 2 John I want to display a rank of these players on various SimpleValue. Something like: nickname for lvl Bob 1 5 John 6 4 For the moment I generate an sql query based on which SimpleValue key you want to display and on which SimpleValue key you want to order players. eg: I want to display 'lvl' and 'for' of each player and order them on the 'lvl' The generated query is: SELECT p.nickname as nickname, v1.value as lvl, v2.value as for FROM Player p LEFT OUTER JOIN SimpleValue v1 ON p.id=v1.playerId and v1.key = 'lvl' LEFT OUTER JOIN SimpleValue v2 ON p.id=v2.playerId and v2.key = 'for' ORDER BY v1.value This query runs perfectly. BUT if I want to display 10 different values, it generates 10 'left outer join'. Is there a way to simplify this query ? I've got a second question: Is there a way to display a portion of this ranking. Imagine I've 1000 players and I want to display TOP 10, I use the LIMIT keyword. Now I want to display the rank of the player Bob which is 326/1000 and I want to display 5 rank player above and below (so from 321 to 331 position). How can I achieve it ? thanks.

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  • Android, NetworkInfo.getTypeName(), NullpointerException

    - by moppel
    I have an activity which shows some List entries. When I click on a list item my app checks which connection type is available ("WIF" or "MOBILE"), through NetworkInfo.getTypeName(). As soon as I call this method I get a NullpointerException. Why? I tested this on the emulator, cause my phone is currently not available (it's broken...). I assume this is the problem? This is the only explanation that I have, if that's not the case I have no idea why this would be null. Here's some code snippet: public class VideoList extends ListActivity{ ... public void onCreate(Bundle bundle){ final ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); ... listview.setOnItemClickListener(new OnItemClickListener(){ public void onItemClick(AdapterView<?> parent, View view, int position, long id) { ... NetworkInfo ni = cm.getActiveNetworkInfo(); String connex = ni.getTypeName(); //Nullpointer exception here if(connex.equals("WIFI")doSomething(); } }); } }

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  • LI Background Images (.PNG) not appeared in IE6

    - by Balkar
    Hi I am using the following CSS but it never shows background images in IE6. But if I remove the filter .. AlphaLoader command, then it shows with grey background. Here is my CSS Code .fg-block1 ul, .fg-block3 ul { list-style:none; } .fg-block1 ul li, .fg-block3 ul li { padding-left:28px; background:url(images/bullet-2.png) no-repeat left top; font-family:Verdana, Arial, Helvetica, sans-serif; font-size:11px; border-bottom:1px dotted #fff; text-align:left; background-position:1px 0; line-height:16px; padding-bottom:5px; margin-bottom:5px; } .fg-block3 ul li { border-bottom:none; } .fg-block1 ul li a, .fg-block3 ul li a { color:#fff; text-decoration:none; } .fg-block1 ul li a:hover, .fg-block3 ul li a:hover { color:#fff; text-decoration:underline; }

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  • AI navigation around a 2d map - Avoiding obstacles.

    - by Curt Walker
    Hey there, I know my question seems pretty vague but I can't think of a better way to put it so I'll start off by explaining what I'm trying to do. I'm currently working on a project whereby I've been given a map and I'm coding a 'Critter' that should be able to navigate it's way around the map, the critter has various other functions but are not relevant to the current question. The whole program and solution is being written in C#. I can control the speed of the critter, and retrieve it's current location on the map by returning it's current X and Y position, I can also set it's direction when it collides with the terrain that blocks it. The only problem I have is that I can't think of a way to intelligently navigate my way around the map, so far I've been basing it around what direction the critter is facing when it collides with the terrain, and this is in no way a good way of moving around the map! I'm not a games programmer, and this is for a software assignment, so I have no clue on AI techniques. All I am after is a push in the right direction on how I could go about getting this critter to find it's way around any map given to me. Here's an image of the map and critters to give you an idea of what i'm talking about. Here's a link to an image of what the maps and critters look like. Map and Critter image I'm in no way looking for anyone to give me a full solution, just a push in the general direction on map navigation. Thanks in advance!

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  • WPF - How to stop an ItemsControl psuedo-grid's columns from dancing/jumping around during layout

    - by Drew Noakes
    Several other questions on SO have come to the same conclusion I have -- using an ItemsControl with a DataTemplate for each item constructed to position items such that they resemble a grid is much simpler (especially to format) than using a ListView. The code resembles: <StackPanel Grid.IsSharedSizeScope="True"> <!-- Header --> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto" SharedSizeGroup="Column1" /> <ColumnDefinition Width="Auto" SharedSizeGroup="Column2" /> </Grid.ColumnDefinitions> <TextBlock Grid.Column="0" Text="Column Header 1" /> <TextBlock Grid.Column="1" Text="Column Header 2" /> </Grid> <!-- Items --> <ItemsControl ItemsSource="{Binding Path=Values, Mode=OneWay}"> <ItemsControl.ItemTemplate> <DataTemplate> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto" SharedSizeGroup="Column1" /> <ColumnDefinition Width="Auto" SharedSizeGroup="Column2" /> </Grid.ColumnDefinitions> <TextBlock Grid.Column="0" Text="{Binding ColumnProperty1}" /> <TextBlock Grid.Column="1" Text="{Binding ColumnProperty2}" /> </Grid> </DataTemplate> </ItemsControl.ItemTemplate> </ItemsControl> </StackPanel> The problem I'm seeing is that whenever I swap the object to which the ItemsSource is bound (it's an ObservableCollection that I replace the reference to, rather than clear and re-add), the entire 'grid' dances about for a few seconds. Presumably it is making a few layout passes to get all the Auto-width columns to match up. This is very distracting for my users and I'd like to get it sorted out. Has anyone else seen this?

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  • Risking the exception anti-pattern.. with some modifications

    - by Sridhar Iyer
    Lets say that I have a library which runs 24x7 on certain machines. Even if the code is rock solid, a hardware fault can sooner or later trigger an exception. I would like to have some sort of failsafe in position for events like this. One approach would be to write wrapper functions that encapsulate each api a: returnCode=DEFAULT; try { returnCode=libraryAPI1(); } catch(...) { returnCode=BAD; } return returnCode; The caller of the library then restarts the whole thread, reinitializes the module if the returnCode is bad. Things CAN go horribly wrong. E.g. if the try block(or libraryAPI1()) had: func1(); char *x=malloc(1000); func2(); if func2() throws an exception, x will never be freed. On a similar vein, file corruption is a possible outcome. Could you please tell me what other things can possibly go wrong in this scenario?

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  • SAX Parser Exceprtion

    - by sairam333
    When I run my application the following error willl be occured some times only,Can u explain why it is occured some times only and what i sthe solution for this and the error message is 03-13 14:38:18.055: WARN/System.err(1866): org.xml.sax.SAXParseException: expected: '' actual: '?' (position:END_TAG @137:35 in java.io.StringReader@438e0ef0) 03-13 14:38:18.064: WARN/System.err(1866): at org.apache.harmony.xml.parsers.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:151) 03-13 14:38:18.074: WARN/System.err(1866): at com.fitzengineering.teslaworldnet.interfacelayer.ParseXMLString.convertPeoples(ParseXMLString.java:484) 03-13 14:38:18.074: WARN/System.err(1866): at com.fitzengineering.teslaworldnet.presentationlayer.People.onCreate(People.java:91) 03-13 14:38:18.074: WARN/System.err(1866): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123) 03-13 14:38:18.084: WARN/System.err(1866): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2231) 03-13 14:38:18.095: WARN/System.err(1866): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2284) 03-13 14:38:18.104: WARN/System.err(1866): at android.app.ActivityThread.access$1800(ActivityThread.java:112)03-13 14:38:18.104: WARN/System.err(1866): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1692) 03-13 14:38:18.114: WARN/System.err(1866): at android.os.Handler.dispatchMessage(Handler.java:99) 03-13 14:38:18.124: WARN/System.err(1866): at android.os.Looper.loop(Looper.java:123) 03-13 14:38:18.134: WARN/System.err(1866): at android.app.ActivityThread.main(ActivityThread.java:3948) 03-13 14:38:18.134: WARN/System.err(1866): at java.lang.reflect.Method.invokeNative(Native Method) 03-13 14:38:18.144: WARN/System.err(1866): at java.lang.reflect.Method.invoke(Method.java:521) 03-13 14:38:18.144: WARN/System.err(1866): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:782) 03-13 14:38:18.154: WARN/System.err(1866): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:540) 03-13 14:38:18.154: WARN/System.err(1866): Thanks in advance

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  • How to implement generic callbacks in C++

    - by Kylotan
    Forgive my ignorance in asking this basic question but I've become so used to using Python where this sort of thing is trivial that I've completely forgotten how I would attempt this in C++. I want to be able to pass a callback to a function that performs a slow process in the background, and have it called later when the process is complete. This callback could be a free function, a static function, or a member function. I'd also like to be able to inject some arbitrary arguments in there for context. (ie. Implementing a very poor man's coroutine, in a way.) On top of that, this function will always take a std::string, which is the output of the process. I don't mind if the position of this argument in the final callback parameter list is fixed. I get the feeling that the answer will involve boost::bind and boost::function but I can't work out the precise invocations that would be necessary in order to create arbitrary callables (while currying them to just take a single string), store them in the background process, and invoke the callable correctly with the string parameter.

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  • WPF RadioButton selected in UI, but seen by code as IsChecked == false

    - by Mike
    I have some radio buttons in a group box. I select the buttons randomly, and all works perfectly from a visual standpoint and also the event handler is called each time a new button is selected. Now I have a dependency property with a callback when the value changes. When in this callback procedure I read the IsChecked value of any button, the value is False, in spite the button is visually selected (they are all false at the same time, strange). The debugger also displays all buttons unchecked. Hu hu, I'm lacking ideas about the reason, after the basic verifications... <GroupBox> <StackPanel> <RadioButton x:Name="btNone" Content="Disconnected" IsChecked="True" Checked="OnSelChecked"/> <RadioButton x:Name="btManual" Content="Manual" Checked="OnSelChecked"/> </StackPanel> </GroupBox> Event handler: private void OnSelChecked(object sender, RoutedEventArgs e) { if (btManual.IsChecked == true) { // is called } } Dependency property: public static readonly DependencyProperty ManualProperty = DependencyProperty.Register("Manual", typeof(Position), typeof(SwitchBox), new FrameworkPropertyMetadata(null, FrameworkPropertyMetadataOptions.AffectsRender, new PropertyChangedCallback(OnManualChanged))); Dependency property callback: private static void OnManualChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args) { SwitchBox box = sender as SwitchBox; if (box.btManual.IsChecked == true) { // never true, why?? } }

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  • Computing "average" of two colors

    - by Francisco P.
    This is only marginally programming related - has much more to do w/ colors and their representation. I am working on a very low level app. I have an array of bytes in memory. Those are characters. They were rendered with anti-aliasing: they have values from 0 to 255, 0 being fully transparent and 255 totally opaque (alpha, if you wish). I am having trouble conceiving an algorithm for the rendering of this font. I'm doing the following for each pixel: // intensity is the weight I talked about: 0 to 255 intensity = glyphs[text[i]][x + GLYPH_WIDTH*y]; if (intensity == 255) continue; // Don't draw it, fully transparent else if (intensity == 0) setPixel(x + xi, y + yi, color, base); // Fully opaque, can draw original color else { // Here's the tricky part // Get the pixel in the destination for averaging purposes pixel = getPixel(x + xi, y + yi, base); // transfer is an int for calculations transfer = (int) ((float)((float) (255.0 - (float) intensity/255.0) * (float) color.red + (float) pixel.red)/2); // This is my attempt at averaging newPixel.red = (Byte) transfer; transfer = (int) ((float)((float) (255.0 - (float) intensity/255.0) * (float) color.green + (float) pixel.green)/2); newPixel.green = (Byte) transfer; // transfer = (int) ((float) ((float) 255.0 - (float) intensity)/255.0 * (((float) color.blue) + (float) pixel.blue)/2); transfer = (int) ((float)((float) (255.0 - (float) intensity/255.0) * (float) color.blue + (float) pixel.blue)/2); newPixel.blue = (Byte) transfer; // Set the newpixel in the desired mem. position setPixel(x+xi, y+yi, newPixel, base); } The results, as you can see, are less than desirable. That is a very zoomed in image, at 1:1 scale it looks like the text has a green "aura". Any idea for how to properly compute this would be greatly appreciated. Thanks for your time!

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