bufferz - Developer IT

XNA MediaPlayer fastforward/rewind

- by bufferz

Using XNA 4.0, I am currently playing songs from the user's PC/XBox360 using the following: Microsoft.Xna.Framework.Media.MediaPlayer.Play(Song song); I see that MediaPlayer has a static Property PlayPosition that, as I've researched, used to be a get/set property, but it has been updated to get-only. Are there any other methods/tricks I can use to explicitly set the playing position of a currently playing song?

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Forcing a page to load itself in another page's iframe

- by bufferz

I'm a fairly inexperienced web designer learning css/html on the fly for a company's web site. I want to keep menus, banners, etc in one document so I don't have to repeat updates across many documents. My solution was to make an index.aspx file with the menus and headers, then have a simple iframe for content. This works quite well and updates easily. the format is: www.site.com/index.aspx?page=page1.htm www.site.com/index.aspx?page=page2.htm The problem -- Google is indexing my iframe'd pages and linking to them directly: www.site.com/page1.htm www.site.com/page2.htm How can I set up redirects to page1.htm forwards to index.aspx?page=page1.htm without creating a "hall of mirrors" effect inside the original iframe?

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Binding scattered/overlapping images to a WPF Canvas

- by bufferz

I am porting a GDI application over to WPF, where I displayed several dozen images onto Form, then drew polygons, circles, rectangles, etc over the top of these images using GDI Pens and Brushes. I'm starting to get the hang of WPF binding and would like to store all of these images and markup graphics in my ViewModel. My VM contains an ObservableCollection of my custom DrawingEntitys, DrawingEntity contains DependencyProperties for BitmapSource, Height, Width, CanvasTopLeftY, and CanvasTopLeftX, that I update frequently in the collection. I know my binding is working, I just can't figure out how to bind and draw this collection onto a Canvas. I've played around with ItemsControl and ItemsSource to death, too many different ways to list here. I can display the DrawingEntity.Bitmaps onto the canvas but Canvas.Top won't bind to CanvasTopLeftY in the DrawingEntity, everything is overlapped at 0,0. I think I'm missing an obvious strategy. Any ideas?

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Creating/Maintaining a large project-agnostic code library

- by bufferz

In order to reduce repetition and streamline testing/debugging, I'm trying to find the best way to develop a group of libraries that many projects can utilize. I'd like to keep individual executable relatively small, and have shared libraries for math, database, collections, graphics, etc. that were previously scattered among several projects and in many cases duplicated (bad!). This library is to be in an SVN repo and several programmers will be working on it. This library will be in constant development along with the executables that utilize it. For example, I want a code file in ProjectA to look something like the following: using MyCompany.Math.2D; //static 2D math methods using MyCompany.Math.3D; //static #D math methods using MyCompany.Comms.SQL; //static methods for doing simple SQLDB I/O using MyCompany.Graphics.BitmapOperations; //static methods that play with bitmaps So in my ProjectA solution file in VisualStudio, in order to develop/debug the MyCompany library I have to add several projects (Math, Comms, Graphics). Things get pretty cluttered and Solution files get out of date quickly between programmer SVN commits. I'm just looking for a high level approach to maintaining a large, shared code base in an SCN repository. I am fully willing to radically redesign my approach. I'm looking for that warm fuzzy feeling you get when you're design approach is spot on and development is fluid and natural. And ideas? Thanks!!

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Single dimension peak fitting

- by bufferz

I have a single dimensional array of floating point values (c# doubles FYI) and I need to find the "peak" of the values ... as if graphed. I can't just take the highest value, as the peak is actually a plateau that has small fluctuations. This plateau is in the middle of a bunch of noise. I'm looking find a solution that would give me the center of this plateau. An example array might look like this: 1,2,1,1,2,1,3,2,4,4,4,5,6,8,8,8,8,7,8,7,9,7,5,4,4,3,3,2,2,1,1,1,1,1,2,1,1,1,1 where the peak is somewhere in the bolded section. Any ideas?

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C# generics when T could be an array

- by bufferz

I am writing a C# wrapper for a 3rd party library that reads both single values and arrays from a hardware device, but always returns an object[] array even for one value. This requires repeated calls to object[0] when I'd like the end user to be able to use generics to receive either an array or single value. I want to use generics so the callee can use the wrapper in the following ways: MyWrapper<float> mw = new MyWrapper<float>( ... ); float value = mw.Value; //should return float; MyWrapper<float[]> mw = new MyWrapper<float[]>( ... ); float[] values = mw.Value; //should return float[]; In MyWrapper I have the Value property currently as the following: public T Value { get { if(_wrappedObject.Values.Length > 1) return (T)_wrappedObject.Value; //T could be float[]. this doesn't compile. else return (T)_wrappedObject.Values[0]; //T could be float. this compiles. } } I get a compile error in the first case: Cannot convert type 'object[]' to 'T' If I change MyWrapper.Value to T[] I receive: Cannot convert type 'object[]' to 'T[]' Any ideas of how to achieve my goal? Thanks!

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MVVM and avoiding Monolithic God object

- by bufferz

I am in the completion stage of a large project that has several large components: image acquisition, image processing, data storage, factory I/O (automation project) and several others. Each of these components is reasonably independent, but for the project to run as a whole I need at least one instance of each component. Each component also has a ViewModel and View (WPF) for monitoring status and changing things. My question is the safest, most efficient, and most maintainable method of instantiating all of these objects, subscribing one class to an Event in another, and having a common ViewModel and View for all of this. Would it best if I have a class called God that has a private instance of all of these objects? I've done this in the past and regretted it. Or would it be better if God relied on Singleton instances of these objects to get the ball rolling. Alternatively, should Program.cs (or wherever Main(...) is) instantiate all of these components, and pass them to God as parameters and then let Him (snicker) and His ViewModel deal with the particulars of running this projects. Any other suggestions I would love to hear. Thank you!

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Which Visual Studio 2010 edition for sole developer

- by bufferz

I am the sole .net developer for a small company. My projects span many .net technologies including WinForms, WPF, SQL, XNA, Linq, WCF, WTF?, and others. I struggle staying on top of all these projects so I'm looking to make my life easier with the release of VS2010. Without a mentor I rely heavily on StackOverflow and whatever else Google comes up with. Should I convince my company to get an edition with an MSDN subscription? Is it one of those things where once you have it, you can't imagine life without it? What about the source control that comes with VS2010, do you all find it better than an SVN server? We're looking to hire another programmer this year, would I be best off getting a Team edition of VS2010 to be best prepared for that hire? Thanks!

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C# generics with MVVM, pulling the T out of <T>

- by bufferz

My Model is a generic class that contains a (for example) Value property which can be int, float, string, bool, etc. So naturally this class is represented something like Model<T>. For the sake of collections Model<T> implements the interface IModel, although IModel is itself empty of any content. My ViewModel contains and instance of Model<T> and it is passed in through ViewModel's constructor. I still want to know what T is in ViewModel, so when I expose Model to the View I know the datatype of Model's buried Value property. The class for ViewModel ends up looking like the following: class ViewModel<T> { private Model<T> _model; public ViewModel(Model<T> model) { ....blah.... } public T ModelsValue {get; set; } } This works fine, but is limited. So now I need to expose a collection of IModels with varying Ts to my View, so I'm trying to set up an ObservableCollection of new ViewModel<T>s to a changing list of IModels. The problem is, I can't figure out how to get T from Model<T> from IModel to construct ViewModel<T>(Model<T>) at runtime. In the VS2010 debugger I can mouseover any IModel object and see its full Model<int> for example at runtime so I know the data is in there. Any ideas?

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Ways to access a 32bit DLL from a 64bit exe

- by bufferz

I have a project that must be compiled and run in 64 bit mode. Unfortunately, I am required to call upon a DLL that is only available in 32 bit mode, so there's no way I can house everything in a 1 Visual Studio project. I am working to find the best way to wrap the 32 bit DLL in its own exe/service and issue remote (although on the same machine) calls to that exe/service from my 64 bit app. My OS is Win7 Pro 64 bit. The required calls to this 32 bit process are several dozen per second, but low data volume. This is a realtime image analysis application so response time is critical despite low volume. Lots of sending/receiving single primitives. Ideally, I would host a WCF service to house this DLL, but in a 64 bit OS one cannot force the service to run as x86! Source. That is really unfortunate since I timed function calls to the WCF service to be only 4ms on my machine. I have experimented with named pipes is .net. I found them to be 40-50 times slower than WCF (unusable for me). Any other options or suggestions for the best way to approach my puzzle?

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