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  • GDB not breaking on breakpoints set on object creation in C++

    - by Drew
    Hi all, I've got a c++ app, with the following main.cpp: 1: #include <stdio.h> 2: #include "HeatMap.h" 3: #include <iostream> 4: 5: int main (int argc, char * const argv[]) 6: { 7: HeatMap heatMap(); 8: printf("message"); 9: return 0; 10: } Everything compiles without errors, I'm using gdb (GNU gdb 6.3.50-20050815 (Apple version gdb-1346) (Fri Sep 18 20:40:51 UTC 2009)), and compiled the app with gcc (gcc version 4.2.1 (Apple Inc. build 5646) (dot 1)) with the commands "-c -g". When I add breakpoints to lines 7, 8, and 9, and run gdb, I get the following... (gdb) break main.cpp:7 Breakpoint 1 at 0x10000177f: file src/main.cpp, line 8. (gdb) break main.cpp:8 Note: breakpoint 1 also set at pc 0x10000177f. Breakpoint 2 at 0x10000177f: file src/main.cpp, line 8. (gdb) break main.cpp:9 Breakpoint 3 at 0x100001790: file src/main.cpp, line 9. (gdb) run Starting program: /DevProjects/DataManager/build/DataManager Reading symbols for shared libraries ++. done Breakpoint 1, main (argc=1, argv=0x7fff5fbff960) at src/main.cpp:8 8 printf("message"); (gdb) So, why of why, does anyone know, why my app does not break on the breakpoints for the object creation, but does break on the printf line? Drew J. Sonne.

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  • Using android gesture on top of menu buttons

    - by chriacua
    What I want is to have an options menu where the user can choose to navigate the menu between: 1) touching a button and then pressing down on the trackball to select it, and 2) drawing predefined gestures from Gestures Builder As it stands now, I have created my buttons with OnClickListener and the gestures with GestureOverlayView. Then I select starting a new Activity depending on whether the using pressed a button or executed a gesture. However, when I attempt to draw a gesture, it is not picked up. Only pressing the buttons is recognized. The following is my code: public class Menu extends Activity implements OnClickListener, OnGesturePerformedListener { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); //create TextToSpeech myTTS = new TextToSpeech(this, this); myTTS.setLanguage(Locale.US); //create Gestures mLibrary = GestureLibraries.fromRawResource(this, R.raw.gestures); if (!mLibrary.load()) { finish(); } // Set up click listeners for all the buttons. View playButton = findViewById(R.id.play_button); playButton.setOnClickListener(this); View instructionsButton = findViewById(R.id.instructions_button); instructionsButton.setOnClickListener(this); View modeButton = findViewById(R.id.mode_button); modeButton.setOnClickListener(this); View statsButton = findViewById(R.id.stats_button); statsButton.setOnClickListener(this); View exitButton = findViewById(R.id.exit_button); exitButton.setOnClickListener(this); GestureOverlayView gestures = (GestureOverlayView) findViewById(R.id.gestures); gestures.addOnGesturePerformedListener(this); } public void onGesturePerformed(GestureOverlayView overlay, Gesture gesture) { ArrayList<Prediction> predictions = mLibrary.recognize(gesture); // We want at least one prediction if (predictions.size() > 0) { Prediction prediction = predictions.get(0); // We want at least some confidence in the result if (prediction.score > 1.0) { // Show the gesture Toast.makeText(this, prediction.name, Toast.LENGTH_SHORT).show(); //User drew symbol for PLAY if (prediction.name.equals("Play")) { myTTS.shutdown(); //connect to game // User drew symbol for INSTRUCTIONS } else if (prediction.name.equals("Instructions")) { myTTS.shutdown(); startActivity(new Intent(this, Instructions.class)); // User drew symbol for MODE } else if (prediction.name.equals("Mode")){ myTTS.shutdown(); startActivity(new Intent(this, Mode.class)); // User drew symbol to QUIT } else { finish(); } } } } @Override public void onClick(View v) { switch (v.getId()){ case R.id.instructions_button: startActivity(new Intent(this, Instructions.class)); break; case R.id.mode_button: startActivity(new Intent(this, Mode.class)); break; case R.id.exit_button: finish(); break; } } Any suggestions would be greatly appreciated!

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  • WPF - LayoutUpdated event firing repeatedly

    - by Drew Noakes
    I've been adding a bit of animation to my WPF application. Thanks to Dan Crevier's unique solution to animating the children of a panel combined with the awesome WPF Penner animations it turned out to be fairly straightforward to make one of my controls look great and have its children move about with some nice animation. Unfortunately this all comes with a performance overhead. I'm happy to have the performance hit when items are added/removed or the control is resized, but it seems that this perf hit occurs consistently throughout the application's lifetime, even when items are completely static. The PanelLayoutAnimator class uses an attached property to hook the UIElement.LayoutUpdated.aspx) event. When this event fires, render transforms are animated to cause the children to glide to their new positions. Unfortunately it seems that the LayoutUpdated event fires every second or so, even when nothing is happening in the application (at least I don't think my code's doing anything -- the app doesn't have focus and the mouse is steady.) As the reason for the event is not immediately apparent to the event handler, all children of the control have to be reevaluated. This event is being called about once a second when idle. The frequency increases when actually using the app. So my question is, how can I improve the performance here? Any answer that assists would be appreciated, but I'm currently stuck on these sub-questions: What causes the LayoutUpdated event to fire so frequently? Is this supposed to happen, and if not, how can I find out why it's firing and curtail it? Is there a more convenient way within the handler to know whether something has happened that might have moved children? If so, I could bail out early and avoid the overhead of looping each child. For now I will work around this issue by disabling animation when there are more than N children in the panel.

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  • How did Microsoft create assemblies that have circular references?

    - by Drew Noakes
    In the .NET BCL there are circular references between: System.dll and System.Xml.dll System.dll and System.Configuration.dll System.Xml.dll and System.Configuration.dll Here's a screenshot from .NET Reflector that shows what I mean: How Microsoft created these assemblies is a mystery to me. Is a special compilation process required to allow this? I imagine something interesting is going on here.

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  • Parsing Lisp S-Expressions with known schema in C#

    - by Drew Noakes
    I'm working with a service that provides data as a Lisp-like S-Expression string. This data is arriving thick and fast, and I want to churn through it as quickly as possible, ideally directly on the byte stream (it's only single-byte characters) without any backtracking. These strings can be quite lengthy and I don't want the GC churn of allocating a string for the whole message. My current implementation uses CoCo/R with a grammar, but it has a few problems. Due to the backtracking, it assigns the whole stream to a string. It's also a bit fiddly for users of my code to change if they have to. I'd rather have a pure C# solution. CoCo/R also does not allow for the reuse of parser/scanner objects, so I have to recreate them for each message. Conceptually the data stream can be thought of as a sequence of S-Expressions: (item 1 apple)(item 2 banana)(item 3 chainsaw) Parsing this sequence would create three objects. The type of each object can be determined by the first value in the list, in the above case "item". The schema/grammar of the incoming stream is well known. Before I start coding I'd like to know if there are libraries out there that do this already. I'm sure I'm not the first person to have this problem.

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  • Pushing from an existing git repo to a new SVN repo

    - by Drew Noakes
    All examples I've found on git-svn detail how to use git to mirror an existing SVN repo, work on it, then commit your changes back. I have a pure git repo, created via git init not git-svn init and want to commit it to a new SVN service (Google Code, to be specific). Is this something that can be done?

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  • Method of transforming 3D vectors with a matrix

    - by Drew Noakes
    I've been doing some reading on transforming Vector3 with matrices, and am tossing up digging deeper into the math and coding this myself versus using existing code. For whatever reason my school curriculum never included matrices, so I'm filling a gap in my knowledge. Thankfully I only need a few simple things, I think. Context is that I'm programming a robot for the RoboCup 3D league. I'm coding it in C# but it'll have to run on Mono. Ideally I wouldn't use any existing graphics libraries for this (WinForms/WPF/XNA) as all I really need is a neat subset of matrix transformations. Specifically, I need translation and x/y/z rotations, and a way of combining multiple transformations into a single matrix. This will then be applied to my own Vector3 type to produce the transformed Vector3. I've read different advice about this. For example, some model the transformation with a 4x3 matrix, others with a 4x4 matrix. Also, some examples show that you need a forth value for the vector's matrix of 1. What happens to this value when it's included in the output? [1 0 0 0] [x y z 1] * [0 1 0 0] = [a b c d] [0 0 1 0] [2 4 6 1] The parts I'm missing are: What sizes my matrices should be Compositing transformations by multiplying the transformation matrices together Transforming 3D vectors with the resulting matrix As I mostly just want to get this running, any psuedo-code would be great. Information about what matrix values perform what transformations is quite clearly defined on many pages, so need not be discussed here unless you're very keen :)

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  • How to implement an interface member that returns void in F#

    - by Drew Noakes
    Imagine the following interface in C#: interface IFoo { void Bar(); } How can I implement this in F#? All the examples I've found during 30 minutes of searching online show only examples that have return types which I suppose is more common in a functional style, but something I can't avoid in this instance. Here's what I have so far: type Bar() = interface IFoo with member this.Bar = void Fails with FS0010: Unexpected keyword 'void' in expression.

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  • What causes a WPF ListCollectionView that uses custom sorting to re-sort its items?

    - by Drew Noakes
    Consider this code (type names genericised for the purposes of example): // Bound to ListBox.ItemsSource _items = new ObservableCollection<Item>(); // ...Items are added here ... // Specify custom IComparer for this collection view _itemsView = CollectionViewSource.GetDefaultView(_items) ((ListCollectionView)_itemsView).CustomSort = new ItemComparer(); When I set CustomSort, the collection is sorted as I expect. However I require the data to re-sort itself at runtime in response to the changing of the properties on Item. The Item class derives from INotifyPropertyChanged and I know that the property fires correctly as my data template updates the values on screen, only the sorting logic is not being called. I have also tried raising INotifyPropertyChanged.PropertyChanged passing an empty string, to see if a generic notification would cause the sorting to be initiated. No bananas. EDIT In response to Kent's suggestion I thought I'd point out that sorting the items using this has the same result, namely that the collection sorts once but does not re-sort as the data changes: _itemsView.SortDescriptions.Add( new SortDescription("PropertyName", ListSortDirection.Ascending));

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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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  • Tips on designing a .NET API for future use with F#

    - by Drew Noakes
    I'm in the process of designing a .NET API to allow developers to create RoboCup agents for the 3D simulated soccer league. I'm pretty happy with how the API work with C# code, however I would like to use this project to improve my F# skill (which is currently based on reading rather than practice). So I would like to ask what kinds of things I should consider when designing an API that is to be consumed by both C# and F# code. Some points. I make fairly heavy use of matrix and vector math. These are currently immutable classes/structs. The API currently defines a few interfaces with the consumer implements (eg: IAgent), using instances of their implementations (eg: MyAgent) to construct other API classes (eg: new Client(myAgent)). The API fires events. The API exposes a few delegate types. The API includes several enums. I'd like to release a version of the API as soon as possible and don't want to make major changes to it later if I realise it's too difficult to work with from F#. Any advice is appreciated.

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  • Extending the .NET type system so the compiler enforces semantic meaning of primitive values in cert

    - by Drew Noakes
    I'm working with geometry a bit at the moment and am converting a lot between degrees and radians. Unfortunately, both of these are represented by double, so there's compile time warning/error if I try to pass a value in degrees where radians are expected. I believe F# has a compile-time solution for this (called units of measure.) I'd like to do something similar in C#. As another example, imagine a SQL library that accepts various query parameters as strings. It'd be good to have a way of enforcing that only clean strings were allowed to be passed in at runtime, and the only way to get a clean string was to pass through some SQL injection attack preventing logic. The obvious solution is to wrap the double/string/whatever in a new type to give it the type information the compiler needs. I'm curious if anyone has an alternative solution. If you do think wrapping is the only/best way, then please go into some of the downsides of the pattern (and any upsides I haven't mentioned too.) I'm especially concerned about the performance of abstracted primitive numeric types on my calculations at runtime.

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  • OpenGL - GL_FRONT versus GL_FRONT_AND_BACK

    - by Drew Noakes
    I'm tinkering with an open source project that uses OpenGL for rendering in 3D. In the construction of the materials I see code like this: // set ambient material reflectance glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, mAmbient); In other examples, this is used: glMaterialfv(GL_FRONT, GL_AMBIENT, mAmbient); So my question is, what is the difference here? Under what circumstances would it look different and, if my volume is enclosed with all normals pointing outwards, is there any performance difference?

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  • Example of a RoboCup 3D Soccer bot?

    - by Drew Noakes
    I'd like to write a bot to play in the 3D RoboCup simulated soccer league. Can anyone point me at some code that already deals with communication with the server, etc? Ideally this would be .NET code, but an example produced in any language would still be useful. EDIT For anyone who is not familiar with the RoboCup 3D Soccer league, check out this YouTube video. It has some pretty funny moments, if you're into that sort of thing...

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  • Faster alternative to Python's SimpleHTTPServer

    - by Drew Noakes
    Python's SimpleHTTPServer is a great way of serve the contents of the current directory from the command line: python -m SimpleHTTPServer However, as far as web servers go, it's very slooooow... It behaves as though it's single threaded, and occasionally causes timeout errors when loading JavaScript AMD modules using RequireJS. It can take five to ten seconds to load a simple page with no images. What's a faster alternative that is just as convenient?

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  • AWS Cloud Formation.Requires capabilities : [CAPABILITY_IAM] (Child Stack)

    - by Drew Khoury
    I'm running a CloudFormation template in the AWS Console. Running Stack Directly I started with a template that used IAM resources, and the console prompts me to acknowledge IAM capabilities when running the stack directly. Running Stack as a child I then tried to call the same stack from a parent stack and did not receive the same prompt. The stack then failed with the message: Requires capabilities : [CAPABILITY_IAM] Research The docs indicate that I can run CF scripts in a number of ways. There's plenty of docs around CLI/API and supplying the capability parameter, but there appears to be no information about how to make sure it's applied when running through the console. http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-iam-template.html IAM Resources in AWS CloudFormation Templates CF Console CLI API What I've done / What I think I've raised an issue via the forum for now, but no response (yet): https://forums.aws.amazon.com/thread.jspa?threadID=139160 I suspect this is a bug in the Console, as there doesn't appear to be any documentation of how to change the behaviour via the console and as far as I'm aware this should just work. Anyone came across the same problem, or can report that it's working fine for them?

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  • Heartbeat (Linux HA) and NetApp?

    - by Drew
    Does anyone have any experience setting up a high availability two node Linux cluster using heartbeat (linux-ha.org) and NetApp storage (preferably using SnapDrive for Linux)? Basically I would like to mount the same NetApp LUN over Fibre Channel to two servers in an Active/Passive mode (only one server can access the LUN at a time) Thanks!

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  • IBook G4 Charging Problems?

    - by Drew
    Hello, I am having some trouble with my iBook G4. It seems that whenever I plug it into the wall charger that it doesn't charge. It's not the charger's fault. There's a button on the back of it right next the battery, when I push it all five lights next to the button light up. I don't think where the charger is put in is broken. Any help? .

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  • Redmine plug-in fails at rake db:migrate_plugins

    - by Drew
    Hey, First post, so hope I'm in the right place. While trying to install the Redmine plug-in 'Wiki Extensions', I keep getting stuck when I try to run the "rake db:migrate_plugins RAILS_ENV=production" command. I am moving server and I'm in bit over my head. Haven't found anything on Google that has helped me much, though I might have missed something. I have pasted in the output with --trace: (in /srv/www/vastpark.org/redmine) ** Invoke db:migrate_plugins (first_time) ** Invoke environment (first_time) ** Execute environment ** Execute db:migrate_plugins Migrating engines... Migrating acts_as_activity_provider... Migrating acts_as_attachable... Migrating acts_as_customizable... Migrating acts_as_event... Migrating acts_as_list... Migrating acts_as_searchable... Migrating acts_as_tree... Migrating acts_as_versioned... Migrating acts_as_watchable... Migrating awesome_nested_set... Migrating classic_pagination... Migrating coderay-0.9.2... Migrating gravatar... Migrating open_id_authentication... Migrating prepend_engine_views... Migrating redmine_wiki_extensions... == CreateWikiExtensionsComments: migrating =================================== -- create_table(:wiki_extensions_comments) rake aborted! An error has occurred, all later migrations canceled: Mysql::Error: Table 'wiki_extensions_comments' already exists: CREATE TABLE 'wiki_extensions_comments' ('id' int(11) DEFAULT NULL auto_increment PRIMARY KEY, 'wiki_page_id' int(11), 'key_word' varchar(255), 'user_id' int(11), 'comment' text, 'created_at' datetime, 'updated_at' datetime) ENGINE=InnoDB

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  • Excel 2007 - Adding line breaks in a cell and no line over 50 characters

    - by Richard Drew
    I have notes stored in an excel cell. I add line breaks and dates every time I add a new note. I need to copy this to another program, but it has a line limit of 50 characters. I want a line break for each new date and for when each date's comment goes over 50 characters. I'm able to do one or the other, but I can't figure out how to do both. I'd prefer words not to be split up, but at this point I don't care. Below is some sample input. If needed for a SUBSTITUTE or REPLACE function, I could add a ~ before each date in my input as a delimiter. Sample Input: 07/03 - FU on query. Copies and history included. CC to Jane Doe and John Public 06/29 - Cust claiming not to have these and wrong PO on query form. Responded with inv sent dates and locations, correct PO values, and copies. 06/27 - New ticket opened using query form 06/12 - Opened ticket with helpdesk asking status 05/21 - Copy submitted to [email protected] 05/14 - Copy sent to John Public and [email protected] Ideal Output: 07/03 - FU on query. Copies and history included. CC to Jane Doe and John Public 06/29 - Cust claiming not to have these and wrong PO on query form. Responded with inv sent dates an d locations, correct PO values, and copies. 06/27 - New ticket opened using query form 06/12 - Opened ticket with helpdesk asking status 05/21 - Copy submitted to [email protected] om 05/14 - Copy sent to John Public and email@custome r.com

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  • Indexing text file content with command line query

    - by Drew Carlton
    I take daily notes in a plaintext file labeled with date in the YYYYMMDD format. These files are no more than 100 lines long, and are written in a blog style format. I'd like to be able search these files as if they were blog posts indexed by google, with some phrase query returning the most relevant/recent date filenames, with a snippet containing the relevant part. Ideally it would be something like this: #searchindex "laptop no sound" returns: 20100909.txt: ... laptop sound isn't working... 20100101.txt ... sound is too loud... debating what laptop to buy... and so on and so forth. I'm working on a linux platform (Debian with GNOME). I've looked at beagle and tracker, but they just seem complete overkill for what I want.

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  • Have 3 Monitors Display the same thing? (WinXP)

    - by Drew Tenenbaum
    I have a setup in which there is a Computer running windows XP, with 3 monitors plugged into it, with a "Matrox Millennium P750" Graphics card. What I want is to enable mirroring of ALL THREE MONITORS, meaning I want all the monitors to display the same image. In Matrox Powerdesk, it does not have an option to do this, and I'm pretty sure that Windows XP does not support it nativley. I really should only need some software/drivers, right? What can i do to display the same thing on 3 screens?

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