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• Why does ElapsedTicks X 10 000 not equal ElapsedMilliseconds for .Net's Stopwatch?

  - by uriDium

  I am trying to performance test some code. I am using a stopwatch. When I output the number of milliseconds it always tells me 0 so I thought that I would try the number of ticks. I am seeing that the number of ticks is about 20 000 to 30 000. Looking at the MSDN at TimeSpan.TicksPerMillisecond it says that is 10 000 ticks per millisecond. In that case why are the elapsed milliseconds on my stopwatch not appearing as 2 or 3? What am I missing? I have even outputed the result on the same line. This is what I get. Time taken: 26856 ticks, 0 ms And it is constant.

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• How do I write the audio stream to a memory buffer instead of a file using DirectShow?

  - by yngvedh

  Hi, I have made a sample application which constructs a filter graph to capture audio from the microphone and stream it to a file. Is there any filter which allows me to stream to a memory buffer instead? I'm following the approach outlined in an article on msdn and are currently using the CLSID_FileWriter object to write the audio to file. This works nicely, but I cannot figure out how to write to a memory buffer. Is there such a memory sink filter or do I have to create it myself? (I would prefer one which is bundled with windows XP)

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• c# EnumerateFiles wildcard returning non matches?

  - by Sam Underhill

  As a simplified example I am executing the following IEnumerable<string> files = Directory.EnumerateFiles(path, @"2010*.xml", SearchOption.TopDirectoryOnly).ToList(); In my results set I am getting a few files which do no match the file pattern. According to msdn searchPattern wildcard is "Zero or more characters" and not a reg ex. An example is that I am getting a file name back as "2004_someothername.xml". For information there are in excess of 25,000 files in the folder. Does anyone have any idea what is going on?

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• Get detailed information on FileSystemEventArgs.ChangeType

  - by case23

  I using the FileWatcher Class to locate changes on Files in a specific Folder. I managed to detect Changes on Files but not detailed Information. On the WatcherChangeTypes Enumeration Page http://msdn.microsoft.com/en-us/library/t6xf43e0%28v=VS.100%29.aspx they write the Change Type detects the changes include: changes to size, attributes, security settings, last write, and last access time. Is there a way to detect which kind of change happened? Thats the Event handler method i use. private void OnChanged(object source, FileSystemEventArgs e) { Console.WriteLine("File: " + e.FullPath + " Change Type: " + e.ChangeType); } Thank you in advance Case

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• Undocumented feature of Dictionary?

  - by Jon

  Dictionary<string, int> testdic = new Dictionary<string, int>(); testdic.Add("cat", 1); testdic.Add("dog", 2); testdic.Add("rat", 3); testdic.Remove("cat"); testdic.Add("bob", 4); Fill the dictionary and then remove the first element. Then add a new element. Bob then appears at position 1 instead of at the end, therefore it seems to remember removed entries and re-uses that memory space? Is this documented anywhere because I can't see it on MSDN and has caused me a day of grief because I assumed it would just keep adding to the end.

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• GetWindowLongPtr fails if called when handling WM_CREATE

  - by Semen Semenych

  Calling the GetWindowLongPtr function for a dialog box with the DWL_USER parameter fails when done from the WM_CREATE handler. It gives no error (checked that, the return value is always zero), which, according to the MSDN documentation, occurs only if SetWindowLongPtr has not been called previously. However, I call it after registering the window class, and properly call the SetWindowPos after that. Finally, calling GetWindowLongPtr in any other event handler, that is, later than WM_CREATE, works fine. Is there something I'm missing in the initialization sequence, or maybe the messages are sent in some not so obvious order?

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• simple obj-c naming question

  - by Highstead

  This question is more to figure out how to look up classes and objects in objective-c but i lack the knowledge to figure out how to look this up so i pose the question here. In .Net if i had a MyObject.MyValue the MyValue would be called a property, and I could look this up in MSDN. In java i would check the javadocs online (and that property would have to be a value). With objective-c that is called a ? and if i wanted to look it up i would look where? Example: //Object.??? UIImage.backgroundColor = [UIColor blueColor];

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• How to create a lookup column that targets a Doc Lib and uses the 'Name' of the document?

  - by stlawrence

  How do you create a lookup column to a Document Library that uses the 'Name' of the document as the lookup value? I found a blog post that recommends adding another custom field like "FileName" and then using a item reciever to populate the custom field with the value from the Name field but that seems cheesy. Link to the blog in case people are interested: http://blogs.msdn.com/pranab/archive/2008/01/08/sharepoint-2007-moss-wss-issue-with-lookup-column-to-doc-lib-name-field.aspx I've got a bunch of custom document content types that I dont want to clutter with a work around that should really work anyway.

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• Detect if an assembly is available

  - by jgaa

  I'm implementing an installer in Java, that is supposed to download and install an application for non-privileged users in Windows (from XP and up). The application is written in C++, and depend on the usual VC runtime-libraries (msvcm90.dll and friends). In order to save bandwidth, I want to avoid downloading the VC redistributables if they already are available for the user. I do however have a problem finding a reliable method to detect if an assembly is installed. If the assembly is missing, I will deploy it as described here: http://msdn.microsoft.com/en-us/library/ms235291%28VS.80%29.aspx So the question is simply how to detect if a (any) assembly is installed on the machine. It's no requirement that this can be done from Java. I can easily write a small probe in C++ and link it statically for the task. jgaa

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• Getting lpfnAcceptEx (accpetex) to block in native C++

  - by Alikar

  Hello, I've been trying to get the lpfnAcceptEX function in Win32 to block on accept. If this is not possible I was wondering if there was a flag I could accpet or some other function that I could wait on. Right now the program is simply continually creating accepted sockets with no connections behind them. Perhaps I am misunderstanding how this is to work. Is there another function I need to wait on? I am following the example laid out here: http://msdn.microsoft.com/en-us/library/ms737524(VS.85).aspx Thanks, = Alikar

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• What is a cross-platform way to get the current directory?

  - by rubenvb

  I need a cross-platform way to get the current working directory (yes, getcwd does what I want). I thought this might do the trick: #ifdef _WIN32 #include <direct.h> #define getcwd _getcwd // stupid MSFT "deprecation" warning #elif #include <unistd.h> #endif #include <string> #include <iostream> using namespace std; int main() { string s_cwd(getcwd(NULL,0)); cout << "CWD is: " << s_cwd << endl; } I got this reading: _getcwd at MSDN getcwd at Kernel.org getcwd at Apple.com There should be no memory leaks, and is should work on a Mac as well, correct?

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• How to check the compatibility between my program and the .net framework versions?

  - by Jack

  Hi all I am writing a program which is targeted to run on .net framework 2.0. I have chosen 2.0 in my VS project. It runs fine on my machine (mine has 2.0 SP2), so there is no compile error. but when I tried to run it on another machine (only with 2.0, no sp), it cannot run. I am aware that I used some method which is supported by 2.0 but only with 2.0 SP2. .net framework 2.0 SP2 seems not being listed in VS IDE, that's why VS cannot give me any warning when I compiled it on my machine. How can I easily check the compatibility of my codes with .net framework 2.0 SP2? or I just have to look at msdn to check every method I have used??? thanks

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• error C2065: 'AfxBeginThread' : undeclared identifier

  - by bdhar

  I have a simple ATL Service in which I have included the following statement. AfxBeginThread(WorkerThread, this, THREAD_PRIORITY_NORMAL, 0, 0); But the compiler complains that error C2065: 'AfxBeginThread' : undeclared identifier But in MSDN i found that AfxBeginThread is found in AFXWIN.H If I include AFXWIN.H, the compiler complains that fatal error C1189: #error : WINDOWS.H already included. MFC apps must not #include <windows.h> What am I missing here? Thanks. PS: I am using Visual Studio 6.0 Enterprise Edition in Windows XP SP2.

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• How is executed a SendMessage from a different thread?

  - by Lorenzo

  When we send a message, "if the specified window was created by the calling thread, the window procedure is called immediately as a subroutine". But "if the specified window was created by a different thread, the system switches to that thread and calls the appropriate window procedure. Messages sent between threads are processed only when the receiving thread executes message retrieval code." (taken from MSDN documentation for SendMessage). Now, I don't understand how (or, more appropriately, when) the target windows procedure is called. Of course the target thread will not be preempted (the program counter is not changed). I presume that the call will happen during some wait function (like GetMessage or PeekMessage), it is true? That process is documented in detail somewhere?

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• What exactly does a self-describing type in .Net mean?

  - by tzup

  Given this MSDN article, we learn that the Common Type System in .Net has this classification of reference types: "Reference types can be self-describing types, pointer types, or interface types. The type of a reference type can be determined from values of self-describing types. Self-describing types are further split into arrays and class types." So an array, for instance, is a self-describing type because we can determine it's type from its values? How? Is that it, or is there more to this definition?

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• use of views for validation of an incorrect login-id or an unidentified user

  - by sqlchild

  I read this on msdn: Views let different users to see data in different ways, even when they are using the same data at the same time. This is especially useful when users who have many different interests and skill levels share the same database. For example, a view can be created that retrieves only the data for the customers with whom an account manager deals. The view can determine which data to retrieve based on the login ID of the account manager who uses the view. My question: For the above example , i would have to have a column named Userid/LoginId on my table on which the view is created so that i can apply a check option in the view for this column. and then if a user with a name not in that column tries to enter data , then he/she is blocked.

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• Getting value of specific item in combobox in Visual Basic 2013

  - by JaceG

  I'm having great difficulty trying to find how to simply get the text of one specific item in a ComboBox. I have cmbSelectedHinge as a dropdownlist style. All I need is to know what the text is in position 0. I would have thought simply: MsgBox(cmbSelectHinge.Items.IndexOf(0)) but no. It returns "-1" even though there is a line of text in it. It seems this question has never before been asked on the internet, and there's no useful information on MSDN. Any help, please

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• Access USB devices through Delphi in Windows XP standard

  - by Lex Dean

  I'm into pis18f's and Delphi Support out their is for everything but Delphi from my point of view as a hobbyist and many like me Delphi connecting to a pic's has many advantages I write in Mikro Pascal I'm fully familiar with MSDN and connecting to windows The small/medium programs out their made in Delphi is enormous think what that can do for pics. This project needs to me written to connect to old windows XP in kernel mode I think and not SP2 or SP3 dependent as thats all you can buy now. I would like it to be a Delphi DCU file for delphi simplisity But I expect some how it to be a DLL in the end. Can any one out their help me with any advice please Email:- lexdeanair At hotmail.com

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• How to interpret situations where Math.Acos() reports invalid input?

  - by Sean Ochoa

  Hey all. I'm computing the angle between two vectors, and sometimes Math.Acos() returns NaN when it's input is out of bounds (-1 input && input 1) for a cosine. What does that mean, exactly? Would someone be able to explain what's happening? Any help is appreciated! Here's me method: public double AngleBetween(vector b) { var dotProd = this.Dot(b); var lenProd = this.Len*b.Len; var divOperation = dotProd/lenProd; // http://msdn.microsoft.com/en-us/library/system.math.acos.aspx return Math.Acos(divOperation) * (180.0 / Math.PI); }

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• Static dictionary in .Net Thread safety

  - by Emmanuel

  Reading msdn documentation for dictionaries it says : "Public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe." Those this mean that with a dictionary such as this : static object syncObject = new object(); static Dictionary<string,MyObject> mydictionary= new Dictionary<string, MyObject>(); Is doing something like the code below unnecessary? lock (syncObject) { context = new TDataContext(); mydictionary.Add("key", myObject); }

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• javascript function object's inheritFrom method

  - by gawpertron

  I've come across this.inheritFrom that enables you to inherit from a super class. var superClass = function() { this.foo = 'foo'; this.bar = 'bar'; } var subClass = function() { this.inheritFrom = superClass; this.inheritFrom(); this.myFunction = function() { return this.foo; }; } I've looked in Mozilla and MSDN, but I can't seem to find it documented any where. As far as I can see it works in IE6 and Firefox 3. Any reason why it wouldn't be documented?

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• Programatically determining file "size on disk" in advance

  - by porkchop

  I need to know how big a given in-memory buffer will be as an on-disk (usb stick) file before I write it. I know that unless the size falls on the block size boundary, its likely to get rounded up, e.g. a 1 byte file takes up 4096 bytes on-disk. I'm currently doing this using GetDiskFreeSpace() to work out the disk block size, then using this to calculate the on-disk size like this: GetDiskFreeSpace(szDrive, &dwSectorsPerCluster, &dwBytesPerSector, NULL, NULL); dwBlockSize = dwSectorsPerCuster * dwBytesPerSector; if (dwInMemorySize % dwBlockSize != 0) { dwSizeOnDisk = ((dwInMemorySize / dwBlockSize) * dwBlockSize) + dwBlockSize; } else { dwSizeOnDisk = dwInMemorySize; } Which seems to work fine, BUT GetDiskFreeSpace() only works on disks up to 2GB according to MSDN. GetDiskFreeSpaceEx() doesn't return the same information, so my question is, how else can I calculate this information for drives 2GB? Is there an API call I've missed? Can I assume some hard values depending on the overall disk size?

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• C# connectionString encryption questions

  - by 5YrsLaterDBA

  I am learning how to encrypt the ConnectionString for our C# (3.5) Application. I read the .Net Framwork Developer Guide (http://msdn.microsoft.com/en-us/library/89211k9b(VS.80).aspx) about securing connection string. but not fully understand the contents. It says "The connection string can only be decrypted on the computer on which it was encrypted." We have a release machine which will build our application which will generate the OurApp.exe.config and then install it to many product machines. Is that meam we have to have this encryption process separated with our application and run it at individual product machine? We may use the "RSAProtectedConfigurationProvider". It mentioned we need encryption key for that provider. when and how we should provide the encryption key? thanks,

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• How to set full control to a directory??

  - by smwikipedia

  I am using the following simple code to add full control to a directory, but it doesn't work. String dir_name = @"folder_full_path"; DirectorySecurity dir_security = Directory.GetAccessControl(dir_name); FileSystemAccessRule access_rule = new FileSystemAccessRule(@"AccountName", FileSystemRights.FullControl, AccessControlType.Allow); dSecurity.AddAccessRule(access_rule); Directory.SetAccessControl(dir_name, dir_security); But this code only set special permissions to the target folder. This code is almost the same as the MSDN sample. I am scratching my head for a reasonable explanation... Hope someone could shed some light on me. Many thanks.

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• ODBC - multiple connections from one app to the same data source

  - by Marcin K

  I vaguely remember reading somewhere (in MSDN ODBC documentation?) that one application cannot make more than one connection to a single data source. It seemed to me that I need one connection that all the threads of the application will have to share. I was trying to look this information up, but I can't seem to find it anymore. Does anyone know/remember how this works? It all might become a problem in our app, since some of its threads will dynamically connect to data sources of their choice. I don't want to see random connection errors if two of them will connect at the same time to one source, so I wanted to double check this info.

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