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• Validating result of JsonConvert.DeserializeObject (think "try parse") using JSON.Net

  - by Riri

  I have incoming messages that I need to try and parse in my own objects structure. SOme of these are well formed JSON obejcts and some are just nonsense. I use JsonConvert.DeserializeObject<MyObject>(incmoingString); to do this. This however sometimes gives me a exception when the incoming is total garbage. Other times I get a non-complete object structure when the incoming string is kind of OK - and finally it sometimes work. I've wrapped the conversion in a try/catch and than manually validate that I've gotten the properties I need to the deserialized result. Is there a better way to do this?

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• Can VS2010 help me find memory leaks?

  - by Andrew Garrison

  I'm going through the pain right now of finding memory leaks in my application using WinDbg. Luckily, I've found a few good articles that give a very good step-by-step process of how to do it. Still, it is a fairly painful process. Does VS2010 have any built in features that can ease the burden of finding a memory leak in a Silverlight application? Of course, a memory leak in .NET sounds a bit like a misnomer, but what I intend to do is to find all objects that are still referencing an object that I believe should be garbage collected. For those that may be interested, here are some good articles on how to get started using WinDbg to find memory leaks in Silverlight: Finding Memory Leaks In Silverlight With WinDbg Hunting down memory leaks in Silverlight

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• Emgu CV - memory-leaks (memory consumption)

  - by martin pilch

  I am using EmguCV, the OpenCV wrapper for .NET. I am disposing all created objects but my app is still using more and more memory (in release configuration too). I have debugged my app using .NET Memory profiler and get this result: http://img532.imageshack.us/img532/2503/screenqv.png all objects instance count is oscilating but GChandle instance counr is increasing until my machine is unusable. Garbage collector does not release memory (i think). I am using VS 2008 professional, Win7 prof 32-bit, both up to date, and last stable version of emguCV. I can post some app code, if it will help. Thanks and sorry for my English. Martin

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• JSON + 3des encrypt dosen't work

  - by oscurodrago

  i'm trying to pass some JSON data encrypted to my app but seem when i decrypt it my script add some 00 to hexe code making it impossible to be serialized i've tried to pass data uncrypted and crypted and the only difference i found is 00 at the end that is how i read JSON if isn't Encrypted NSLog(@"A) %@", response ); NSMutableArray *json = [NSJSONSerialization JSONObjectWithData:response options:kNilOptions error:&error]; NSLog(@"B) %@", error); that is NSLog Output 2012-03-28 00:43:58.399 VGCollect[5583:f803] A) <5b7b2274 69746c65 223a2252 696c6173 63696174 61206c61 20707269 6d612045 7370616e 73696f6e 65206469 20526167 6e61726f 6b204f64 79737365 79222c22 63617465 676f7279 223a225b 20505356 69746120 5d222c22 696d6755 726c223a 22494d41 4745535c 2f323031 325c2f30 335c2f30 30303038 3536345f 31353078 38302e6a 7067227d 2c7b2274 69746c65 223a2250 68616e74 61737920 53746172 204f6e6c 696e6520 3220616e 63686520 73752069 4f532065 20416e64 726f6964 20222c22 63617465 676f7279 223a225b 20495048 4f4e452c 2050432c 20505356 69746120 5d222c22 696d6755 726c223a 22494d41 4745535c 2f323031 325c2f30 335c2f30 30303038 3437355f 31353078 38302e6a 7067227d 2c7b2274 69746c65 223a2250 72696d69 20536372 65656e73 686f7420 696e2061 6c747261 20726973 6f6c757a 696f6e65 20706572 202e6861 636b5c2f 5c2f7665 72737573 222c2263 61746567 6f727922 3a225b20 50533320 5d222c22 696d6755 726c223a 22494d41 4745535c 2f323031 325c2f30 335c2f30 30303038 3437325f 31353078 38302e6a 7067227d 2c7b2274 69746c65 223a2269 6c206e75 6f766f20 444c4320 64692046 696e616c 2046616e 74617379 20584949 492d3220 636f6e66 65726d61 746f2061 6e636865 20696e20 416d6572 69636122 2c226361 7465676f 7279223a 225b2050 53332c20 58333630 205d222c 22696d67 55726c22 3a22494d 41474553 5c2f3230 31325c2f 30335c2f 30303030 38343439 5f313530 7838302e 6a706722 7d2c7b22 7469746c 65223a22 52656769 73747261 746f2069 6c206d61 72636869 6f205461 6c657320 6f662058 696c6c69 6120696e 20457572 6f706122 2c226361 7465676f 7279223a 225b2050 5333205d 222c2269 6d675572 6c223a22 494d4147 45535c2f 32303132 5c2f3033 5c2f3030 30303834 34385f31 35307838 302e6a70 67227d2c 7b227469 746c6522 3a225376 656c6174 69202e68 61636b5c 2f5c2f56 65727375 732e2065 202e6861 636b5c2f 5c2f5365 6b616920 6e6f204d 756b6f75 206e6922 2c226361 7465676f 7279223a 225b2050 5333205d 222c2269 6d675572 6c223a22 494d4147 45535c2f 32303132 5c2f3033 5c2f3030 30303834 33345f31 35307838 302e6a70 67227d2c 7b227469 746c6522 3a22476f 6e205061 6b752050 616b7520 50616b75 2050616b 75204164 76656e74 75726520 756e206e 756f766f 2067696f 636f2064 69204e61 6d636f20 42616e64 6169222c 22636174 65676f72 79223a22 5b203344 53205d22 2c22696d 6755726c 223a2249 4d414745 535c2f32 3031325c 2f30335c 2f303030 30383432 385f3135 30783830 2e6a7067 227d2c7b 22746974 6c65223a 224e756f 76652069 6d6d6167 696e6920 6520696e 666f2064 69204669 72652045 6d626c65 6d204177 616b656e 696e6722 2c226361 7465676f 7279223a 225b2033 4453205d 222c2269 6d675572 6c223a22 494d4147 45535c2f 32303132 5c2f3033 5c2f3030 30303834 31365f31 35307838 302e6a70 67227d2c 7b227469 746c6522 3a225072 696d6520 696d6d61 67696e69 20646569 206e756f 76692044 4c432064 69204669 6e616c20 46616e74 61737920 58494949 2d32222c 22636174 65676f72 79223a22 5b205053 332c2058 33363020 5d222c22 696d6755 726c223a 22494d41 4745535c 2f323031 325c2f30 335c2f30 30303038 3431325f 31353078 38302e6a 7067227d 2c7b2274 69746c65 223a2249 6e206172 7269766f 20717565 73746f20 41757475 6e6e6f20 45706963 204d6963 6b657920 323a2054 68652050 6f776572 206f6620 54776f22 2c226361 7465676f 7279223a 225b2050 53332c20 5769692c 20583336 30205d22 2c22696d 6755726c 223a2249 4d414745 535c2f32 3031325c 2f30335c 2f303030 30383430 385f3135 30783830 2e6a7067 227d5d> 2012-03-28 00:43:58.410 VGCollect[5583:f803] B) (null) instead that is how i serialize my crypted JSON NSData *decryptBase64 = [GTMBase64 decodeData:response]; NSData *decrypt3DES = [Crypt TripleDES:decryptBase64 encryptOrDecrypt:kCCDecrypt key:@"2b9534b45611cbb2436e625d"]; NSLog(@"A) %@", decrypt3DES ); NSMutableArray *json = [NSJSONSerialization JSONObjectWithData:decrypt3DES options:kNilOptions error:&error]; NSLog(@"B) %@", error); and that is the NSLog output 2012-03-28 00:41:51.525 VGCollect[5529:f803] A) <5b7b2274 69746c65 223a2252 696c6173 63696174 61206c61 20707269 6d612045 7370616e 73696f6e 65206469 20526167 6e61726f 6b204f64 79737365 79222c22 63617465 676f7279 223a225b 20505356 69746120 5d222c22 696d6755 726c223a 22494d41 4745535c 2f323031 325c2f30 335c2f30 30303038 3536345f 31353078 38302e6a 7067227d 2c7b2274 69746c65 223a2250 68616e74 61737920 53746172 204f6e6c 696e6520 3220616e 63686520 73752069 4f532065 20416e64 726f6964 20222c22 63617465 676f7279 223a225b 20495048 4f4e452c 2050432c 20505356 69746120 5d222c22 696d6755 726c223a 22494d41 4745535c 2f323031 325c2f30 335c2f30 30303038 3437355f 31353078 38302e6a 7067227d 2c7b2274 69746c65 223a2250 72696d69 20536372 65656e73 686f7420 696e2061 6c747261 20726973 6f6c757a 696f6e65 20706572 202e6861 636b5c2f 5c2f7665 72737573 222c2263 61746567 6f727922 3a225b20 50533320 5d222c22 696d6755 726c223a 22494d41 4745535c 2f323031 325c2f30 335c2f30 30303038 3437325f 31353078 38302e6a 7067227d 2c7b2274 69746c65 223a2269 6c206e75 6f766f20 444c4320 64692046 696e616c 2046616e 74617379 20584949 492d3220 636f6e66 65726d61 746f2061 6e636865 20696e20 416d6572 69636122 2c226361 7465676f 7279223a 225b2050 53332c20 58333630 205d222c 22696d67 55726c22 3a22494d 41474553 5c2f3230 31325c2f 30335c2f 30303030 38343439 5f313530 7838302e 6a706722 7d2c7b22 7469746c 65223a22 52656769 73747261 746f2069 6c206d61 72636869 6f205461 6c657320 6f662058 696c6c69 6120696e 20457572 6f706122 2c226361 7465676f 7279223a 225b2050 5333205d 222c2269 6d675572 6c223a22 494d4147 45535c2f 32303132 5c2f3033 5c2f3030 30303834 34385f31 35307838 302e6a70 67227d2c 7b227469 746c6522 3a225376 656c6174 69202e68 61636b5c 2f5c2f56 65727375 732e2065 202e6861 636b5c2f 5c2f5365 6b616920 6e6f204d 756b6f75 206e6922 2c226361 7465676f 7279223a 225b2050 5333205d 222c2269 6d675572 6c223a22 494d4147 45535c2f 32303132 5c2f3033 5c2f3030 30303834 33345f31 35307838 302e6a70 67227d2c 7b227469 746c6522 3a22476f 6e205061 6b752050 616b7520 50616b75 2050616b 75204164 76656e74 75726520 756e206e 756f766f 2067696f 636f2064 69204e61 6d636f20 42616e64 6169222c 22636174 65676f72 79223a22 5b203344 53205d22 2c22696d 6755726c 223a2249 4d414745 535c2f32 3031325c 2f30335c 2f303030 30383432 385f3135 30783830 2e6a7067 227d2c7b 22746974 6c65223a 224e756f 76652069 6d6d6167 696e6920 6520696e 666f2064 69204669 72652045 6d626c65 6d204177 616b656e 696e6722 2c226361 7465676f 7279223a 225b2033 4453205d 222c2269 6d675572 6c223a22 494d4147 45535c2f 32303132 5c2f3033 5c2f3030 30303834 31365f31 35307838 302e6a70 67227d2c 7b227469 746c6522 3a225072 696d6520 696d6d61 67696e69 20646569 206e756f 76692044 4c432064 69204669 6e616c20 46616e74 61737920 58494949 2d32222c 22636174 65676f72 79223a22 5b205053 332c2058 33363020 5d222c22 696d6755 726c223a 22494d41 4745535c 2f323031 325c2f30 335c2f30 30303038 3431325f 31353078 38302e6a 7067227d 2c7b2274 69746c65 223a2249 6e206172 7269766f 20717565 73746f20 41757475 6e6e6f20 45706963 204d6963 6b657920 323a2054 68652050 6f776572 206f6620 54776f22 2c226361 7465676f 7279223a 225b2050 53332c20 5769692c 20583336 30205d22 2c22696d 6755726c 223a2249 4d414745 535c2f32 3031325c 2f30335c 2f303030 30383430 385f3135 30783830 2e6a7067 227d5d00> 2012-03-28 00:41:51.530 VGCollect[5529:f803] B) Error Domain=NSCocoaErrorDomain Code=3840 "The operation couldn’t be completed. (Cocoa error 3840.)" (Garbage at end.) UserInfo=0x6ccdd40 {NSDebugDescription=Garbage at end.} as u can see the only difference between 2 NSlogs is 00 at the end of second hexcode and the error on serialization of it do u know how fix that ? idk if is needed, that is my script for encrypt data +(NSData*)TripleDES:(NSData*)plainData encryptOrDecrypt:(CCOperation)encryptOrDecrypt key:(NSString*)key { const void *vplainText; size_t plainTextBufferSize; plainTextBufferSize = [plainData length]; vplainText = (const void *)[plainData bytes]; CCCryptorStatus ccStatus; uint8_t *bufferPtr = NULL; size_t bufferPtrSize = 0; size_t movedBytes = 0; // uint8_t ivkCCBlockSize3DES; bufferPtrSize = (plainTextBufferSize + kCCBlockSize3DES) & ~(kCCBlockSize3DES - 1); bufferPtr = malloc( bufferPtrSize * sizeof(uint8_t)); memset((void *)bufferPtr, 0x0, bufferPtrSize); // memset((void *) iv, 0x0, (size_t) sizeof(iv)); // NSString *key = @"123456789012345678901234"; NSString *initVec = @"init Vec"; const void *vkey = (const void *) [key UTF8String]; const void *vinitVec = (const void *) [initVec UTF8String]; ccStatus = CCCrypt(encryptOrDecrypt, kCCAlgorithm3DES, (kCCOptionPKCS7Padding | kCCOptionECBMode) , vkey, //"123456789012345678901234", //key kCCKeySize3DES, vinitVec, //"init Vec", //iv, vplainText, //"Your Name", //plainText, plainTextBufferSize, (void *)bufferPtr, bufferPtrSize, &movedBytes); NSData *result = [NSData dataWithBytes:(const void *)bufferPtr length:(NSUInteger)movedBytes]; return result; }

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• Why is there no IronPerl (Perl for .Net)?

  - by Renaud Bompuis

  I'm a bit disappointed that there doesn't seem to be any effort to make Perl a first-class citizen of the .Net world. I've read a few 'reasons' in the past but I don't see why they can't be overcome (different garbage collectors, hard-to-parse syntax, part of CPAN modules couldn't be ported, different communities, ...). Activestate has a Perl.Net product but it's a hack (in the good sense) around a standard interpreter and some syntactic sugar to interoperate with .Net assemblies. A few years ago they stopped they visual studio integration of Perl citing lack of interest. That was a while ago, before all the changes to .Net to make it more 'dynamic'. Am I the only one who yearns for IronPerl?

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• converting between struct and byte array

  - by chonch

  his question is about converting between a struct and a byte array. Many solutions are based around GCHandle.Alloc() and Marshal.StructureToPtr(). The problem is these calls generate garbage. For example, under Windows CE 6 R3 about 400 bytes of garbarge is made with a small structure. If the code below could be made to work the solution could be considered cleaner. It appears the sizeof() happens too late in the compile to work. public struct Data { public double a; public int b; public double c; } [StructLayout(LayoutKind.Explicit)] public unsafe struct DataWrapper { private static readonly int val = sizeof(Data); [FieldOffset(0)] public fixed byte Arr[val]; // "fixed" is to embed array instead of ref [FieldOffset(0)] public Data; // based on a C++ union }

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• Strange thing about .NET 4.0 filesystem enumeratation functionality

  - by codymanix

  I just read a page of "Whats new .NET Framework 4.0". I have trouble understanding the last paragraph: To remove open handles on enumerated directories or files Create a custom method (or function in Visual Basic) to contain your enumeration code. Apply the MethodImplAttribute attribute with the NoInlining option to the new method. For example: [MethodImplAttribute(MethodImplOptions.NoInlining)] Private void Enumerate() Include the following method calls, to run after your enumeration code: * The GC.Collect() method (no parameters). * The GC.WaitForPendingFinalizers() method. Why the attribute NoInlining? What harm would inlining do here? Why call the garbage collector manually, why not making the enumerator implement IDisposable in the first place? I suspect they use FindFirstFile()/FindNextFile() API calls for the imlementation, so FindClose() has to be called in any case if the enumeration is done.

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• What causes a JRE 6 JVM code cache leak?

  - by Arturo Knight

  Since switching to JRE 6, my server's code cache usage (non-heap) keeps growing indefinitely. My application creates a lot of classes at runtime, BUT these classes are successfully unloaded during the GC process. I can see these classes getting unloaded in the gc logs and also the permGen usage stays constant. I specifically make sure in my code that these classes are orphaned once I am finished with them and so they correctly get garbage collected from permGen. The code cache however keeps growing. I only became aware of the code cache after switching to JRE 6. So I guess my questions are: Does GC include the code cache? What could cause a code cache memory leak, specifically. Is there a bug in JDK 6 in this area?

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• Display Image from Byte Array in WPF - Memory Issues

  - by ChrisFletcher

  Hi, I've developed an application to capture and save images to a database, but I'm having an issue with memory usage. On my domain object I have 3 properties: Image - Byte array, contents are a jpg RealImageThumb - The byte array converted to a BitmapImage and shrunk, displayed to the user in a gridview with other thumbnails RealImage - Has no setter, the byte array converted to a bitmap source, this is shown in a tooltip when the user hovers over it. The issue I have is that if a user hovers over each image in turn the memory usage spirals. I realise that as a user hovers over bitmap sources are generated and the memory isn't freed up, I've tried giving RealImage a backing property and assigning this to null after but again the memory isn't freed up (waiting for the garbage colelctor?.

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• Why Do Browsers Leak Memory?

  - by Dane Balia

  A colleague and I were speaking about browsers (using browser control in a project), and it appears as plain as day that all browsers (Firefox, Chrome, IE, Opera) display the same characteristic or side-effect from their usage and that being 'Leaking Memory'. Can someone explain why that is the case? Surely as with any form of code, there should be proper garbage collection? PS. I've read about some defensive patterns on why this can happen from a developer's perspective. I am aware of an article Crockford wrote on IE; but why is the problem symptomatic of every browser? Thanks

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• Named pipe is not flushing in Python

  - by BrainCore

  I have a named pipe created via the os.mkfifo() command. I have two different Python processes accessing this named pipe, process A is reading, and process B is writing. Process A uses the select function to determine when there is data available in the fifo/pipe. Despite the fact that process B flushes after each write call, process A's select function does not always return (it keeps blocking as if there is no new data). After looking into this issue extensively, I finally just programmed process B to add 5KB of garbage writes before and after my real call, and likewise process A is programmed to ignore those 5KB. Now everything works fine, and select is always returning appropriately. I came to this hack-ish solution by noticing that process A's select would return if process B were to be killed (after it was writing and flushing, it would sleep on a read pipe). Is there a problem with flush in Python for named pipes?

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• Linq to SQl over WCF Timesout after several calls

  - by Redeemed1

  I have a L2S Repository class which instantiates the L2S DataContext in its constructor. The repository is instantiated at run time (using Unity) in a service hosted in IIS with WCF. When I run up the client MVC applicaton the calls to the backend WCF service work for a while and then timeout. I suspected perhaps a database issue as I was depending on IIS garbage collection to dispose of unused DataContext instances in the IIS host but when I checked the characteristics of the problem I notice the following: The client makes the call to WCF but the WCF service does not respond. Next, the client times out Some time later (several minutes) the service actually executes the request by instantiating the repository and servicing the call. I have checked both client and server traces logs and only the client shows WCF errors (the timeout error). Where should I look? Is it something in WCF or is L2S possibly blocking with unfreed conenctions, resources etc.? Many thanks Brian

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• Linq to SQL DataContext Windsor IoC memory leak problem

  - by Mr. Flibble

  I have an ASP.NET MVC app that creates a Linq2SQL datacontext on a per-web-request basis using Castler Windsor IoC. For some reason that I do not fully understand, every time a new datacontext is created (on every web request) about 8k of memory is taken up and not released - which inevitably causes an OutOfMemory exception. If I force garbage collection the memory is released OK. My datacontext class is very simple: public class DataContextAccessor : IDataContextAccessor { private readonly DataContext dataContext; public DataContextAccessor(string connectionString) { dataContext = new DataContext(connectionString); } public DataContext DataContext { get { return dataContext; } } } The Windsor IoC webconfig to instantiate this looks like so: <component id="DataContextAccessor" service="DomainModel.Repositories.IDataContextAccessor, DomainModel" type="DomainModel.Repositories.DataContextAccessor, DomainModel" lifestyle="PerWebRequest"> <parameters> <connectionString> ... </connectionString> </parameters> </component> Does anyone know what the problem is, and how to fix it?

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• Memory leak in WPF app due to DelegateCommand.

  - by Abdullah BaMusa

  I just finished desktop apps written in WPF and c# using MVVM pattern. In this app I used Delegate Command implementation to wrap the ICommands properties exposed in my ModelView. The problem is these DelegateCommands prevent my ModelView and View from being garbage collected after closing the view. So it stays larking until I terminate the whole application. I profile the application I find it’s all about delegatecommand that keeping the modelview in memory. How could I avoid this situation and is this in nature of mvvm pattern, or it’s about my implantation of the pattern?. Thanks

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• Removing the image from an IKImageView

  - by Brian Postow

  I have an IKImageView that is coming up effectively un-initialized. This is happening effectively in an error-state (The user is unregistered) so I haven't had a chance to put an image in it yet. In 10.6, this comes up fine, with a black rectangle. In 10.5, however, it comes up with garbage. some rectangles of noise, some rectangles of copies of the desktop, etc. I've tried setting the ZoomFactor to 0.0, I've tried setting the image to nil, but it appears that the problem is beyond that. any ideas? (My next kludge is going to be to ship tiny blank image with the app, and try to get it to load that... but that's kind of silly)

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• Problem reading from the StandarOutput from ftp.exe. Possible System.Diagnostics.Process Framework b

  - by SoMoS

  Hello, I was trying some stuff executing console applications when I found this problem handling the I/O of the ftp.exe command that everybody has into the computer. Just try this code: m_process = New Diagnostics.Process() m_process.StartInfo.FileName = "ftp.exe" m_process.StartInfo.CreateNoWindow = True m_process.StartInfo.RedirectStandardInput = True m_process.StartInfo.RedirectStandardOutput = True m_process.StartInfo.UseShellExecute = False m_process.Start() m_process.StandardInput.AutoFlush = True m_process.StandardInput.WriteLine("help") MsgBox(m_process.StandardOutput.ReadLine()) MsgBox(m_process.StandardOutput.ReadLine()) MsgBox(m_process.StandardOutput.ReadLine()) MsgBox(m_process.StandardOutput.ReadLine()) This should show you the text that ftp sends you when you do that from the command line: Los comandos se pueden abreviar. Comandos: ! delete literal prompt send ? debug ls put status append dir mdelete pwd trace ascii disconnect mdir quit type bell get mget quote user binary glob mkdir recv verbose bye hash mls remotehelp cd help mput rename close lcd open rmdir Instead of that I'm getting the first line and 3 more with garbage, after that the call to ReadLine block like if there was no data available. Any hints about that?

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• Python - do big doc strings waste memory?

  - by orokusaki

  I understand that in Python a string is simply an expression and a string by itself would be garbage collected immediately upon return of control to a code's caller, but... Large class/method doc strings in your code: do they waste memory by building the string objects up? Module level doc strings: are they stored infinitely by the interpreter? Does this even matter? My only concern came from the idea that if I'm using a large framework like Django, or multiple large open source libraries, they tend to be very well documented with potentially multiple megabytes of text. In these cases are the doc strings loaded into memory for code that's used along the way, and then kept there, or is it collected immediately like normal strings?

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• c# memory allocation and deallocation patterns

  - by Neal

  Since C# uses Garbage Collection. When is it necessary to use .Dispose to free the memory? I realize there are a few situations so I'll try to list the ones I can think of. If I close a Form that contains GUI type object, are those objects dereferenced and therefore will be collected? If I create a local object using new should I .Dispose of it before the method exits or just let the GC take care of it? What is good practice in this case? Are there any times in which forcing a GC is understandable? Are events collected by the GC when it's object is collected?

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• What is the underlying reason for not being able to put arrays of pointers in unsafe structs in C#?

  - by cons

  If one could put an array of pointers to child structs inside unsafe structs in C# like one could in C, constructing complex data structures without the overhead of having one object per node would be a lot easier and less of a time sink, as well as syntactically cleaner and much more readable. Is there a deep architectural reason why fixed arrays inside unsafe structs are only allowed to be composed of "value types" and not pointers? I assume only having explicitly named pointers inside structs must be a deliberate decision to weaken the language, but I can't find any documentation about why this is so, or the reasoning for not allowing pointer arrays inside structs, since I would assume the garbage collector shouldn't care what is going on in structs marked as unsafe. Digital Mars' D handles structs and pointers elegantly in comparison, and I'm missing not being able to rapidly develop succinct data structures; by making references abstract in C# a lot of power seems to have been removed from the language, even though pointers are still there at least in a marketing sense. Maybe I'm wrong to expect languages to become more powerful at representing complex data structures efficiently over time.

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• Cleanup for control inside a FlowDocument

  - by Thorarin

  I have a custom control that I use inside a FlowDocument. The control uses a System.Drawing.ImageAnimator to display transparent, animated GIF images. Why is this such a pain in the butt in WPF anyway? :P In my original implementation, this was causing memory leaks when a paragraph containing the control was being deleted from the document, because the ImageAnimator kept a reference to the control for event handling. I've now implemented a WeakEventManager pattern which seems to indeed fix the leak itself, but I would like to stop "OnFrameChanged" events from being fired if a particular animated GIF is not currently in the document, instead of relying on the garbage collector to eventually collect the control objects and my event manager to notice that there no longer are valid listeners to the event. Basically, I would like to take a more active role in this and have the control react to being removed from the FlowDocument. Is there some way to do this? I've been unable to find it. OnVisualParentChanged doesn't get fired, because the direct parent (a Paragraph) is unchanged.

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• Unable to view values of variables while debugging

  - by RexM

  I'm trying to debug portions of the current application I'm working on, however when I try and check the value of a property/variable I get the error: Cannot evaluate expression because a thread is stopped at a point where garbage collection is impossible, possibly because the code is optimized. This is just a regular ASP.NET project. In some portions of the application I can view the properties and variables perfectly fine. I haven't figured out what's different about the blocks of code that I can and can not see the values of the variables in.

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• Location of New Window after old window closed

  - by John Brayton

  I have an app that allows multiple windows. I have a strange bug where, if I repeatedly open and close windows, new windows are positioned lower and lower on the screen. I would expect this if I were keeping the windows open, but it seems that the OS X window tiling mechanism is unaware of when my windows are closing. Potentially relevant notes: I am using garbage collection. This is not a document-based app. When I close a window, the corresponding menu item is removed from the "Window" menu. Any hints as to what I might be doing wrong would be appreciated. Thanks!

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• Using SWFObject, the flash moves 1 pixel to the right on Firefox

  - by jeffkee

  Please check this page: http://islandhideaway.weebly.com/ For whatever reason, the flash slideshow moves over 1 pixel when opened in Firefox on my Mac. All other browsers render it fine, but only on Firefox it leaves a 1 pixel white gap on the left! I am using the most recent version of SWFObject. This unfortunately is a garbage Weebly site and I cannot use jQuery in the system so I can't do a real gallery... so let's save the whole "don't use Flash for that" pep talk. It's a favour for a friend and I am already aware of better ways to do it. :)

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• How is dynamic memory allocation handled when extreme reliability is required?

  - by sharptooth

  Looks like dynamic memory allocation without garbage collection is a way to disaster. Dangling pointers there, memory leaks here. Very easy to plant an error that is sometimes hard to find and that has severe consequences. How are these problems addressed when mission-critical programs are written? I mean if I write a program that controls a spaceship like Voyager 1 that has to run for years and leave a smallest leak that leak can accumulate and halt the program sooner or later and when that happens it translates into epic fail. How is dynamic memory allocation handled when a program needs to be extremely reliable?

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• Android OutOfMemoryError - Loading JSON File

  - by jeremynealbrown

  The app I am working on needs to read a JSON file that may be anywhere from 1.5 to 3 MB in size. It seems to have no problem opening the file and converting the data to a string, but when it attempts to convert the string to a JSONArray, OutOfMemoryErrors are thrown. The exceptions look something like this: E/dalvikvm-heap( 5307): Out of memory on a 280-byte allocation. W/dalvikvm( 5307): Exception thrown (Ljava/lang/OutOfMemoryError;) while throwing internal exception (Ljava/lang/OutOfMemoryError;) One strange thing about this is that the crash only occurs every 2nd or 3rd time the app is run, leaving me to believe that the memory consumed by the app is not being garbage collected each time the app closes. Any insight into how I might get around this issue would be greatly appreciated. I am open to the idea of loading the file in chunks, but I'm not quite sure what the best approach is for such a task. Thank you

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