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• When to use AsyncOperation and AsyncOperationManager

  - by Sir Psycho

  Hi, I've spent many many hours tonight reading up on implementing the event-based asynchronous pattern Unfortunately, I haven't been able to find any articles at all on witting a class that only supports one Async invocation. Every example I've seen assumes that a method call will be called more than once and thus, should have a userState object passed into the MethodNameAsync You'll see that MS makes mention of this in the third bullet point on this article http://msdn.microsoft.com/en-us/library/ms228974(VS.80).aspx under the "Simultaneously Executing Operations" heading. But I'm confused. Should I be using AsyncOperation and AsyncOperationManager classes to have asynchronous functionality where a method can only be called by one thread at a time? A link would also be nice :) Thanks

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• Options to develop professionally with Microsoft tools and Technologies without spending a lot?

  - by iama

  I would like to develop applications for the Windows platform & at the very least I need a server based Windows OS (2008), SQL Server, IIS and Visual Studio. Looks like VS2010 professional alone will cost over $1K. Is there a cheaper option to get hold of Microsoft software? I remember long time ago there was an MSDN subscription option which allowed user access to server based OS and other server applications with restrictive licensing that was cost effective. I don't see that option anymore. Moreover, I am not a student & I understand Microsoft provides software at discounted rates for students. Any pointers? Many thanks.

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• How to find all Classes implemeting IDisposable?

  - by apoorv020

  I am working on a large project, and one of my tasks is to remove possible memory leaks. In my code, I have noticed several IDisposable items not being disposed of, and have fixed that. However, that leads me to a more basic question, how do I find all classes used in my project that implement IDisposable? (Not custom created classes by normal Library classes). I have already found one less-than-obvious class that implements IDisposable ( DataTable implements MarshalByValueComponent, which inherits IDisposable). Right now, I am manually checking any suspected classes by using MSDN, but isn't there some way through which I can automate this process?

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• Finding out whether a DirectInput device supports XInput (with mingw/gcc)

  - by Mr. Wonko

  I'm working on an input system, wrapping DirectInput and XInput. Currently XInput devices are enumerated twice, once as XInput and once as DirectInput (since they support both). How can I find out if a given DirectInput device also supports XInput? There is this MSDN page on the topic, but it requires wbemidl.h and wmsstd.h which aren't available in mingw/gcc (and for some reason I want to avoid msvc - probably by habit). I don't think blacklisting device names/guids is a good solution, but is there a better one? Thanks.

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• Setting a cell's format using Excel 2007 Interop and C#

  - by CVertex

  I'm using the office 2007 interop assemblies to create some excel spreadsheets. There are plenty of questions on here about getting started and MSDN contains heaps of articles, like this one. The API is funky, and sometimes a bit confusing. When I set a value of a cell, is there a way to set it's format? I'd like to mark particular fields as Date's so my customer can run excel macros on them. Also, numbers would be useful. Thanks!

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• On WindowsMobile, how can i tell what other processes are reserving shared memory space?

  - by glutz78

  On WindowMobile 6.1, I am using VirtualAlloc to reserve 2MB chunks, which will return me an address from the large shared memory area so allocations do not count against my per process virtual space. (doc here: http://msdn.microsoft.com/en-us/library/aa908768.aspx) However, on some devices i notice that I am not able to reserve memory after a certain point. VirtualAlloc will return NULL (getlasterror() says out of memory). The only explanation for this that I see is that another process has already reserved a bunch of memory and my process is therefore unable to. Any idea where I can find a tool to show me the shared mem region of a WM device? Thanks.

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• Deploying web service

  - by baron

  I am trying to build a webservice that manipulates http requests POST and GET. Here is a sample: public class CodebookHttpHandler: IHttpHandler { public void ProcessRequest(HttpContext context) { if (context.Request.HttpMethod == "POST") { //DoHttpPostLogic(); } else if (context.Request.HttpMethod == "GET") { //DoHttpGetLogic(); } } ... public void DoHttpPostLogic() { ... } public void DoHttpGetLogic() { ... } I need to deploy this but I am struggling how to start. Most online references show making a website, but really, all I want to do is respond when an HttpPost is sent. I don't know what to put in the website, just want that code to run. Some links i've tried so far: http://my.execpc.com/~gopalan/dotnet/webservices/webservice_server.html http://www.beansoftware.com/asp.net-tutorials/deploy-asp.net.aspx http://msdn.microsoft.com/en-us/library/6x71sze4%28VS.80%29.aspx http://www.c-sharpcorner.com/UploadFile/rajaduraip/SimplestwaytoCreateNDeployWebServices12232005054219AM/SimplestwaytoCreateNDeployWebServices.aspx

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• Windows.Networking.EndpointPair constructor parameters

  - by ComFreek

  I want to create a new EndpointPair object: // hostname is a string // port is an integer var endpointPair = new Windows.Networking.EndpointPair(null, null, hostname, port); But I always get this error: 0x800a000d - JavaScript runtime error: Type mismatch I've already tried the following: converting port to a string passing "" instead of null for the first two Parameters. (null should be okay if the documentation here, under the section Remarks, is right) passing no Parameters, but that ends up in an "too few parameters" error message Above all, the documentation about the constructor has been removed (as of September 4, 2012): http://msdn.microsoft.com/en-us/library/windows/apps/windows.networking.endpointpair.endpointpair.aspx

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• Image Viewer application, Image processing with Display Data.

  - by Harsha

  Hello All, I am working on Image Viewer application and planning to build in WPF. My Image size are usually larger than 3000x3500. After searching for week, I got sample code from MSDN. But it is written in ATL COM. So I am planning to work and build the Image viewer as follows: After reading the Image I will scale down to my viewer size, viwer is around 1000x1000. Lets call this Image Data as Display Data. Once displaying this data, I will work only this Display data. For all Image processing operation, I will use this display data and when user choose to save the image, I will apply all the operation to original Image data. My question is, Is is ok to use Display data for showing and initial image processing operations.

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• ListView control rendering issue with Groups, CheckBoxes and View mode SmallIcon

  - by volody

  Microsoft MSDN site has next remark: "Any groups assigned to a ListView control appear whenever the ListView.View property is set to a value other than View.List." My problem is that i like to have View set to SmallIcon. In this mode ListView control is shifted left, and CheckBoxes are covered by left edge How to solve this issue, or at least how is possible to shift rendering of control to the right. My OS is Windows XP Service Pack 3. It looks like that ListView items with Groups and CheckBoxes shows correctly only when View set to Details.

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• SharePoint Lookup Field 20 Item JS error

  - by Chops

  Hi Everyone, I've got an issue with SharePoint Server 2007 SP1 which seems to be documented in various forms, but I haven't been able to find an answer to my seemingly simpler question. http://social.msdn.microsoft.com/Forums/en-US/sharepointcustomization/thread/040533d2-c738-4ac2-b2d6-65a1602fa2d1 Essentially, we have a form with a lookup field to another SharePoint list. The lookup field has more than 20 items, and so SharePoint changes the type/behaviour of the field as per the standard behaviour. However, with my custom skin applied, clicking on this drop down causes a JS error from within the Core.js file, as described here: http://splitnut.blogspot.com/2009/06/lookup-fields-in-moss-javascript-error.html What I haven't been able to figure out is why this is only an issue when my custom master page is applied, and not the OOTB master pages. I've been through and tried to see what might cause this, but haven't been able to track down the cause of the behaviour. Any help would be much appreciated. Many thanks.

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• Asp.net TreeView control - maximum number of nodes

  - by mas_oz2k1

  I have a treeView control in ASP.NET page that will be loaded with up to 12,000 nodes in different levels. For example: Node 1 Node 1.1 … Node 1.400 Node 1.400.1 … Node 1.400.6400 Node 2 Node 3 Node 4 According to this link: http://msdn.microsoft.com/en-us/library/ms529261.aspx the node limit is 1000. Is this correct or is it dependent on available memory(please specify value)? Assuming it is correct. is there any way to split the 4600 child nodes in say in chunks of 300 hundred? I am thinking that if dummy nodes are used (previous /next navigation) to navigate the chunks will easy the load of the html page. Sample code in C# will be greatly appreciated. (Or VB.NET if you can not translate it to C#)

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• What's the difference between IEquatable and just overriding Object.Equals() ?

  - by devoured elysium

  I want my Food class to be able to test whenever it is equal to another class. I will later use it against a List, and I want to use its List.Contains() method. Should I implement IEquatable or just override Object.Equals()? From MSDN: This method determines equality by using the default equality comparer, as defined by the object's implementation of the IEquatable.Equals method for T (the type of values in the list). So my next question is: which functions/classes of the .NET framework make use of Object.Equals()? Should I use it in the first place? Thanks

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• Unable to retrieve the complete description string of the event log record

  - by Santosh Pillai

  Hi All, I have an MFC application that reads and displays event log records using the ::ReadEventLog() API. The problem is with reading the "Description" message string of the event log record. The MFC application is unable to read the complete "Description" message string and displays only some part of it. However the Windows System Event Log Viewer reads and displays the complete "Description" message string correctly. I have ensured that my MFC application reads the entire "Description" message string by retrieving all the strings as provided by the "NumStrings" and "StringOffset" member variables of the EVENTLOGRECORD structure and merging all of them. Also as mentioned in MSDN my application loads the Source Name specific message library file (whose path is specified in the registry at HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\EventLog\Application[SourceName]) that further contains additional message string information and merges it with the earlier read strings. I am still unable to get the entire "Description" message string. Please provide any help towards resolving the issue. Regards, Santosh.

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• SetSel on EN_SETFOCUS or WM_SETFOCUS doesn't work

  - by Coder

  I've ran into next mystic thing in Winapi/MFC, I have an edit box, contents of which I have to select on Tab, Lclick, Rclick, Mclick and so on. The sort of obvious path is to handle the SETFOCUS message and call SetSel(0, -1), which should select all text. But it doesn't work! What's wrong? I tried googling, everyone seems to override Lclilks or handle SetSel in parent windows, but this is wrong from encapsulation point of view, also multiple clicks (user wants to insert something in the middle of the text) will break, and so on. Why isn't my approach working, I tried like 10 different ways, tried to trap all possible focus messages, looked up info on MSDN, but nothing works as expected. Also, I need to recreate the carret on focus, which also doesn't seem to work. SETFOCUS message gets trapped alright. If I add __asm int 3, it breaks every time. It's the create carret and setsel that gets swallowed it seems.

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• How to get smartcard reader name in Windows 7 using C#?

  - by AndrejaKo

  Hi! I'm trying to make a C# program which will use a C .dll (unfortunately, the .dll doesn't have good documentation) to access a smart card. One of the functions of the .dll uses name of the reader as argument. My problem is that I don't know how to get the name. After looking for answers I found something similar to what I need in an example here: http://msdn.microsoft.com/en-us/library/aa379803%28VS.85%29.aspx I'm looking for a way to get szReader value as described in the aforementioned example using C#. Can anyone help me or at least point me in the right direction?

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• How to format a date as localized Short MonthDay string

  - by Wouter

  I would like to format a DateTime to a string containing the month name abbreviated and the date for use in axis labels in a graph. The default DateTime format strings do not contain abbreviated month. I guess there is no standard but I could take a substring of the first 3 characters of the month name and replace this into the MonthDay format. The reason I would use MonthDay is that the ordering of month and date is locale dependent. Does anyone have a better idea? http://msdn.microsoft.com/en-us/library/az4se3k1.aspx#MonthDay

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• Thoughts on Static Code Analysis Warning CA1806 for TryParse calls

  - by Tim

  I was wondering what people's thoughts were on the CA1806 (DoNotIgnoreMethodResults) Static Code Analysis warning when using FxCop. I have several cases where I use Int32.TryParse to pull in internal configuration information that was saved in a file. I end up with a lot of code that looks like: Int32.TryParse(someString, NumberStyles.Integer, CultureInfo.InvariantCulture, out intResult); MSDN says the default result of intResult is zero if something fails, which is exactly what I want. Unfortunately, this code will trigger CA1806 when performing static code analysis. It seems like a lot of redundant/useless code to fix the errors with something like the following: bool success = Int32.TryParse(someString, NumberStyles.Integer, CultureInfo.InvariantCulture, out intResult); if (!success) { intResult= 0; } Should I suppress this message or bite the bullet and add all this redundant error checking? Or maybe someone has a better idea for handling a case like this? Thanks!

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• Is the redistributable ReportViewer 2010 RC available in other languages?

  - by pinkmuppet

  I need to deploy the language packs for the ReportViewer 2010 control (the english one is installed and working perfectly). Before, with ReportViewer 2008 and 2005, all the supported laguages were available on the MS downloads site. I can't seem to find them for the RC of 2010 -- are they available anywhere? From MSDN: To use the localized version of the ReportViewer control redistributable that comes with Visual Studio, do the following: 1.Run ReportViewer.exe. 2.Navigate to the folder that contains the language pack you want to use. Language pack folders are located at %PROGRAMFILES%\Microsoft SDKs\Windows\v7.0A\BootStrapper\Packages\ReportViewer\. 3.Run ReportViewerLP.exe. Is there a generic language pack for VS 2010 RC that would have the localized report viewers as well?

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• Deploy custom web service to sharepoint server(2007/2010)?

  - by leif

  According to MSDN, for deploying custom web service, we need to create *wsdl.aspx and *disco.aspx files, and put them with .asmx together under _vti_bin folder (C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\isapi). And put the dll under bin folder of the root of sharepoint virtual directory. It works correctly for me. However, i also found that if i put .asmx file under the root virtual directory without creating those *wsdl.aspx and *disco.aspx files. It can work as well and much easier than the above way. So i'm wondering what's the potential issues in this way?

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• When binding a client TCP socket to a specific local port with Winsock, SO_REUSEADDR does not have a

  - by Checkers

  I'm binding a client TCP socket to a specific local port. To handle the situation where the socket remains in TIME_WAIT state for some time, I use setsockopt() with SO_REUSEADDR on a socket. It works on Linux, but does not work on Windows, I get WSAEADDRINUSE on connect() call when the previous connection is still in TIME_WAIT. MSDN is not exactly clear what should happen with client sockets: [...] For server applications that need to bind multiple sockets to the same port number, consider using setsockopt (SO_REUSEADDR). Client applications usually need not call bind at all—connect chooses an unused port automatically. [...] How do I avoid this?

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• How to do a sample rate conversion in Windows (and OSX)

  - by Paperflyer

  I am about to write an audio file converter for my side job at the university. As part of this I would need sample rate conversion. However, my professor said that it would be pretty hard to write a sample rate converter that was both of good quality and fast. On my research on the subject, I found some functions in the OSX CoreAudio-framework, that could do a sample rate conversion (AudioConverter.h). After all, an OS has to have some facilities to do that for its own audio stack. Do you know a similar method for C/C++ and Windows, that are either part of the OS or open source? I am pretty sure that this function exists within DirectX Audio (XAudio2?), but I seem to be unable to find a reference to it in the MSDN library.

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• Is Stopwatch really broken?

  - by Jakub Šturc

  At MSDN page for Stopwatch class I discovered link to interesting article which makes following statement about Stopwatch: However there are some serious issues: This can be unreliable on a PC with multiple processors. Due to a bug in the BIOS, Start() and Stop() must be executed on the same processor to get a correct result. This is unreliable on processors that do not have a constant clock speed (most processors can reduce the clock speed to conserve energy). This is explained in detail here. I am little confused. I've seen tons of examples of using Stopwatch and nobody mention this drawbacks. How serious is this? Should I avoid using Stopwatch?

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• Encrypting Files with AES, Encrypting Key with RSA - Am I on the right track?

  - by Shawn Steward

  Overview: I'm trying to design an application that will encrypt files to safely send through the mail. I'm planning on using AES/RijndaelManaged encryption from .Net to encrypt the files initially, using a randomly generated key using RNGCryptoServiceProvider. I'm then encrypting this random AES key with a RSA Public key. The receiver of the data is the only one with the RSA Private key to decrypt it. My question: Is this the proper way to do something like this? If so, is it safe to send this RSA-Encrypted key with the data since it requires the private key to decrypt? Also - when having the end user generate their Public/Private key pair, what is the best way to save the Private key? I do not want it to be only accessible from one machine, so I am trying to avoid using the user's key store. But MSDN says it is not safe to save the key to a file, so how else can you accomplish this?

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• PDB file from different versions of Visual Studio

  - by m3rLinEz

  I have an old DLL file which was built with VC++ 6. Now I need to investigate the dump file but I don't have its PDB available. The stacktrace reported by WinDbg is also inaccurate. Is it possible to rebuild the project with later versions of Visual Studio i.e. 2003, 2005, 2008, have the PDB generated, and use this to map addresses to symbols in the old DLL? Is there something like VC 6.0 compatible mode for building project? Obtaining VC++ 6 is one option, but it looks like VS6.0 has already vanished from MSDN subscriber download page :( Thanks!

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