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• What is the fastest way to write hundreds of files to disk using C#?

  - by Ehsan

  My program should write hundreds of files to disk, received by external resources (network) each file is a simple document that I'm currently store it with the name of GUID in a specific folder but creating hundred files, writing, closing is a lengthy process. Is there any better way to store these amount of files to disk? I've come to a solution, but I don't know if it is the best. First, I create 2 files, one of them is like allocation table and the second one is a huge file storing all the content of my documents. But reading from this file would be a nightmare; maybe a memory-mapped file technique could help. Could working with 30GB or more create a problem?

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• PgJDBC: "no suitable driver found" when following tutorial, why?

  - by Celeritas

  I'm writing a Java program that queries a PostgreSQL database. I'm following this example and have trouble here: connection = DriverManager.getConnection( "jdbc:postgresql://127.0.0.1:5432/testdb", "mkyong", "123456"); According to the JavaDoc for DriverManager the first string is "a database url of the form jdbc:subprotocol:subname. When I connect to the server I type in psql -h dataserv.abc.company.com -d app -U emp24 and give the password qwe123 (for example sake). What should the first argument of getConnection be? I've tried connection = DriverManager.getConnection( "jdbc:postgresql://dataserv.abc.company.com", "emp24", "qwe123"); and get the run time error: no suitable driver found. I've download JDBC4 Postgresql Driver, Version 9.2-1000.

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• web service client in java

  - by user622222

  I want to generate a client program using the service I am unable to display the results, how can I do so? import java.rmi.RemoteException; public class searchtry { public static void main(String[] args) throws RemoteException { SearchRequest request=new SearchRequest(); SearchRequestType1 type1=new SearchRequestType1(); query.setAppId("*********************************"); //Windows Live gave this id for using that service query.setSources(new SourceType[]{SourceType.Web}); query.setQuery("Java"); aratip.setParameters(request); SearchResponseType0 answer= client.search(type1); System.out.println(answer.toString()); }

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• Trace large C++ code base?

  - by anon

  Problem: I have just inherited this 200K LOC source code base. There's only a small part of it I need (and I want to rip all else out). What I would like to do is to be able to: 1) run the program a few times 2) have something (here's where you come in) record which lines of code gets executed 3) then rip out all the irrelevant lines of code I realize this has "problems" in the forms of "different args will take different paths"; but for my needs, it's very specific, and I just want something ot get me started on the right line of for ripping stuff out (I'll fine tune those special cases later). Thanks!

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• Figuring out what makes a C++ class abstract in VS2008

  - by suszterpatt

  I'm using VS2008 to build a plain old C++ program (not C++/CLI). I have an abstract base class and a non-abstract derived class, and building this: Base* obj; obj = new Derived(); fails with the error "'Derived': cannot instantiate abstract class". (It may be worth noting, however, that if I hover over Base with the cursor, VS will pop up a tooltip saying "class Base abstract", but hovering over Derived will only say "class Derived" (no "abstract")). The definitions of these classes are fairly large and I'd like to avoid manually checking if each method has been overridden. Can VS do this for me somehow? Any general tips on pinpointing the exact parts of the class' definition that make it abstract?

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• Is It Worth Using Bitwise Operators In Methods?

  - by user1626141

  I am very new to Java (and programming in general, my previous experience is with ActionScript 2.0 and some simple JavaScript), and I am working my way slowly and methodically through Java: A Beginner's Guide by Herbert Schildt. It is an incredible book. For one thing, I finally understand more-or-less what bitwise operators (which I first encountered in ActionScript 2.0) do, and that they are more efficient than other methods for certain sums. My question is, is it more efficient to use a method that uses, say, a shift right, to perform all your divisions/2 (or divisions/even) for you in a large program with many calculations (in this case, a sprawling RPG), or is it more efficient to simply use standard mathematical operations because the compiler will optimise it all for you? Or, am I asking the wrong question entirely?

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• How do I test switching compilers from MSVS 6 to MSVS 2008?

  - by Leif

  When switching from MSVS 6 to MSVS 2008, what major differences should I look for when testing the software? I'm coming from more of a QA perspective. We have two programs that work closely together that were originally compiled in Visual C++ 6. Now one of the programs has been compiled in Visual C++ 2008 in order to use a specific CD writing routine. The other program is still compiled under MSVS 6. My manager is very concerned with this change and wants me to run tests specific to this change. Since I deal more with QA and less with development, I really have no idea where to start. I've looked for differences between the two, but nothing has given me a clear direction as far as testing is concerned. Any suggestions would be helpful.

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• Compile Flex application without debug? Optimisation options for flex compiler?

  - by maoanz

  I have created a simple test application with the following code var i : int; for (i=0; i<3000000; i++){ trace(i); } When I run the application, it's very slow to load, which means the "trace" is running. I check the flash player by right-clicking, the debugger option is not enable. So I wonder if there is an option to put in compiler to exclude the trace. Otherwise, I have to remove manually all the trace in the program. Are there any other options of compiler to optimize the flex application in a maximum way? Thanks

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• Why does Java return a date in GMT-4.5 when choosing Co-ordinated Universal Time time zone in Window

  - by Simon Nickerson

  We have seen a strange issue on some Windows XP machines involving the "Co-ordinated Universal Time" time zone. Not all Windows XP machines seem to have it, but on those that do, the following simple Java program public class TimeTest { public static void main(String[] args) { System.out.println(java.util.TimeZone.getDefault()); System.out.println(new java.util.Date()); } } on JDK 1.6.0_06 prints: sun.util.calendar.ZoneInfo[id="America/Caracas",offset=-16200000,dstSavings=0,useDaylight=false,transitions=5,lastRule=null] Fri Nov 13 05:34:14 VET 2009 (i.e. 4 and a half hours behind GMT). I should add that I am based in London, and have never been to South America. :-) My questions are: Where does Java get this time zone from? I thought Co-ordinated Universal Time was supposed to be the new name for GMT. Why do some Windows machines have this time zone but not others?

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• How to ignore an exception and continue processing a foreach loop?

  - by Barry Dysert

  I have a test program that is supposed to loop over all the files under C:. It dies when it hits the "Documents and Settings" folder. I'd like to ignore the error and keep looping over the remaining files. The problem is that the exception is thrown in the foreach, so putting a try/catch around the foreach will cause the loop to exit. And putting a try/catch after the foreach never fires (because the exception is thrown in the foreach). Is there any way to ignore the exception and continue processing the loop? Here's the code: static void Main(string[] args) { IEnumerable<string> files = Directory.EnumerateFiles(@"C:\", "*.*", SearchOption.AllDirectories); foreach (string file in files) // Exception occurs when evaluating "file" Console.WriteLine(file); }

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• Horizontally Flip a One Bit Bitmap Line

  - by roygbiv

  I'm looking for an algorithm to flip a 1 Bit Bitmap line horizontally. Remember these lines are DWORD aligned! I'm currently unencoding an RLE stream to an 8 bit-per-pixel buffer, then re-encoding to a 1 bit line, however, I would like to try and keep it all in the 1 bit space in an effort to increase its speed. Profiling indicates this portion of the program to be relatively slow compared to the rest. Example line (Before Flip): FF FF FF FF 77 AE F0 00 Example line (After Flip): F7 5E EF FF FF FF F0 00

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• javascript popup reloads parent page -

  - by harry_T

  I have a popup function in a program that works well, be re-loads the parent page as it loads the child. Is there a way to prevent this behaviour. // popup window function function newPop(url, myWin, width, height, left, top, scrollbars) { parms = 'toolbar=yes, scrollbars=no, location=no, menubar=no, resizable=no, width= ' + width + ' , height=' + height + ' , left= ' + left + ' , top= ' + top + ' , titlebar=no , scrollbars = ' + scrollbars ; var newwin = window.open(url,myWin, parms); newwin.resizeTo(width,height); newwin.moveTo(0,0); newwin.moveTo(left,top); newwin.focus(); return false; }

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• Data-only static libraries with GCC

  - by regularfry

  How can I make static libraries with only binary data, that is without any object code, and make that data available to a C program? Here's the build process and simplified code I'm trying to make work: ./datafile: abcdefghij Makefile: libdatafile.a: ar [magic] datafile main: libdatafile.a gcc main.c libdatafile.a -o main main.c: #define TEXTPTR [more magic] int main(){ char mystring[11]; memset(mystring, '\0', 11); memcpy(TEXTPTR, mystring, 10); puts(mystring); puts(mystring); return 0; } The output I'm expecting from running main is, of course: abcdefghijabcdefghij My question is: what should [magic] and [more magic] be?

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• Online Game programming in Google App Engine: AI

  - by Hortinstein

  I am currently in the planning stages of a game for google app engine, but cannot wrap my head around how I am going to handle AI. I intend to have persistant NPCs that will move about the map, but short of writing a program that generates the same XML requests I use to control player actions, than run it on another server I am stuck on how to do it. I have looked at the Task Queue feature, but due to long running processes not being an option on the App engine, I am a little stuck. I intend to run multiple server instances with 200+ persistant NPC entities that I will need to update. Most action is slowly roaming around based on player movements/concentrations, and attacking close range players(you can probably guess the type of game im developing)

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• Android -- Object Creation/Memory Allocation vs. Performance

  - by borg17of20

  Hello all, This is probably an easy one. I have about 20 TextViews/ImageViews in my current project that I access like this: ((TextView)multiLayout.findViewById(R.id.GameBoard_Multi_Answer1_Text)).setText(""); //or ((ImageView)multiLayout.findViewById(R.id.GameBoard_Multi_Answer1_Right)).setVisibility(View.INVISIBLE); My question is this, am I better off, from a performance standpoint, just assigning these object variables? Further, am I losing some performance to the constant "search" process that goes on as a part of the findViewById(...) method? (i.e. Does findsViewById(...) use some sort of hashtable/hashmap for look-ups or does it implement an iterative search over the view hierarchy?) At present, my program never uses more than 2.5MB of RAM, so will assigning 20 or so more object variables drastically affect this? I don't think so, but I figured I'd ask. Thanks.

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• animating adding/removing layers on iPhone

  - by magesteve

  On the iPhone, when you add a sub layer to a visible view's layer, using either -addSublayer: or -removeFromSuperlayer, shouldn't that sub layer appear or disappear in an animated manner (ie. fade in or fade out gradually)? My program animates using layers (not views). When I change a property of a layer like position or image content, then the change does animate (layer streaks around it's parent layer, the layer fades from the old image to the new image), so I obviously have the layers & view setup correctly. However, when I add or remove a sub layer, the change occurs instantly; there is no animation. Reading the references, it says that if the layer is visible, the sub layer should animate when adder or removed. What am I doing wrong? Has anyone had a similar problem, and was able to find a solution? Thank you, Steve Sheets

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• I don't seem to have an ASPNET user account running on my machine.

  - by pkiyan

  Hi: I'm reading up on ASP.NET, and just came to a chapter that explains how to upload a file to your website. It says that in order to save a file to your file system, in the case of every OS except Win Server '03, an ASP.NET page executes in the security context of the ASPNET account. I don't have an ASPNET account running on my machine (win xp pro sp3; .NET 3.5). The program runs fine, by the way, I'm just trying to understand what an ASPNET account is exactly, and why it doesn't seem to show up on my list of user accounts. Thanks.

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• Application demands elevated privs to run on win7 but not vista

  - by Nifle

  I have a simple app that I just tried the installer (Innosetup) on win7(32-bit). After I install it the program icon on the desktop gets that shield on it that notifies the user that the app demands elevated privileges. I thought it was something wrong with the installer and made on using NSIS instead, same problem. Does anyone know why it does that on this computer but not on xp-32, win7-64 bit or Vista 64-bit? If I allow the app to run (Answers yes to the system prompt) it crashes with only the error " has encountered an error. Windows is looking for a solution" and then closes.

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• Servlet doesnt appear to execute in a threaded manner

  - by RenegadeAndy

  I have developed a simple server using Tomcat which runs a servlet. The servlet calls a command line program - which takes about 20 seconds to execute then returns the result to the user via JSON. The problem is - if i make above 2 simultaneous requests, the servlet blocks until one of the previous requests is completed. An example of this can be seen below - "Im in" is the top of the servlet, and the list of results is after the servlet is executed. All requests were made at the same time - but you can clearly see they are not dealt with simultaneously. What setting do I need to change in tomcat in order to have all requests handeled at the same time? Thanks Andy Im in Im in FVFNT01 STOP_IDLE FVFNT03 STOP_IDLE FVFNT16 STOP_IDLE FVFNT17 STOP_IDLE FVFNT01 STOP_IDLE FVFNT03 STOP_IDLE FVFNT16 STOP_IDLE FVFNT17 STOP_IDLE Im in FVFNT01 STOP_IDLE FVFNT03 STOP_IDLE FVFNT16 STOP_IDLE FVFNT17 STOP_IDLE Im in FVFNT01 STOP_IDLE FVFNT03 STOP_IDLE FVFNT16 STOP_IDLE FVFNT17 STOP_IDLE Im in FVFNT01 STOP_IDLE FVFNT03 STOP_IDLE FVFNT16 STOP_IDLE FVFNT17 STOP_IDLE Im in FVFNT01 STOP_IDLE FVFNT03 STOP_IDLE FVFNT16 STOP_IDLE FVFNT17 STOP_IDLE Im in FVFNT01 STOP_IDLE FVFNT03 STOP_IDLE FVFNT16 STOP_IDLE FVFNT17 STOP_IDLE Im in FVFNT01 STOP_IDLE FVFNT03 STOP_IDLE FVFNT16 STOP_IDLE FVFNT17 STOP_IDLE

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• Class-Dump Installation

  - by sj-dev

  So this may sound like a really stupid question and I HAVE looked at the how-to from the parent website, but no matter what I do, I cannot get this program to even start to install... I tried entering: cd /opt/local/bin/portslocation/dports/class-dump which returned a "this file/director doesnt exist" error, so i tried to get to it folder by folder. when i got all the way to: cd /opt/local/bin/ i cannot go any further. when i check the contents of the bin directory, the only files i can find are (and i cannot access these apparently either): "daemondo port portf portindex portmirror" i have tried doing this on 2 computers so far to no avail, macports is installed on both like the website said and i am having trouble finding any support for it. please and thank you!!

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• How can I create an ODBC connection to SAS?

  - by Chris B.

  I'm writing a program that needs to access SAS data. I've downloaded the ODBC drivers for SAS and installed them, but I need to be able to create ODBC connections on the fly, programmatically. The following code (in Python) seems like it should work: import ctypes ODBC_ADD_DSN = 1 def add_dsn(name, driver, **kw): nul, attrib = chr(0), [] kw['DSN'] = name for attr, val in kw.iteritems(): attrib.append('%s=%s' % (attr, val)) return ctypes.windll.ODBCCP32.SQLConfigDataSource(0, ODBC_ADD_DSN, driver, nul.join(attrib)) == 1 print add_dsn('SAS Test', 'SAS', description = 'Testing SAS') But it pops up the SAS ODBC configuration dialog, sets the datasource name, and waits for the user to enter the information and dismiss the dialog. How can I avoid that?

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• Identify a non-computer network device?

  - by Avilan

  I'm current working on a program that scans my network and discoveres computers and devices on the network. I use various operations to find data on the devices I discover, but want to distinguish the network devices from computers. And I'm wondering if anyone knows how I could do this? I looked a bit at SNMP, and tried connecting to my network printer, router and modem. But I seem to only be able to connect to the printer, neither the router or modem responds. Is there another way to identify what kind of a device an IP address belongs to?

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• Phase REST XML into variable

  - by 001

  I want to get a response from the REST XML web service, and phase it into variables so I can use them in my program. 1) How come this code does not work? I get an empty string... // Get response string ws_response=""; using (HttpWebResponse response = request.GetResponse() as HttpWebResponse) { // Get the response stream StreamReader reader = new StreamReader(response.GetResponseStream()); // web service response string ws_response = reader.ReadToEnd; // <---???? I get an empty string // do phasing here (ie XML element into variable) etc.. // }

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• What technology should I use for a complex report?

  - by SeaDrive

  I have a task to generate reports from a Visual Studio C# application. This is a replacement (caused by new requirements) for a program written using the built-in implementation of Crystal Reports. Although workable, it was far from ideal. The reports have conditional content (If type=1, print this, if type=2 print that.) Crystal does not adjust spacing dynamically and the various pieces were not the same length making for some unprofessional-looking spacing. I had thought of generating the reports in HTML, which would be feasible, but I'm concerned that you lose a degree of control, and I may be asked, e.g. to "move this up a bit" or similar which may be tricky. I'm not either a Crystal guru or an HTML guru. What other reporting technologies are available that would make it easy to drop in parts of different sizes, do table layouts, etc.?

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• Help with output generated by this C code using fork()

  - by Seephor

  I am trying to figure out the output for a block of C code using fork() and I am having some problems understanding why it comes out the way it does. I understand that when using fork() it starts another instance of the program in parallel and that the child instance will return 0. Could someone explain step by step the output to the block of code below? Thank you. main() { int status, i; for (i=0; i<2; ++i){ printf("At the top of pass %d\n", i); if (fork() == 0){ printf("this is a child, i=%d\n", i); } else { wait(&status); printf("This is a parent, i=%d\n", i); } } }

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