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• MUL instruction help

  - by Tanner Babcock

  I've read a few tutorials and examples, but I cannot wrap my head around how the MUL instruction works. I've used ADD and SUB without problems. So apparently this instruction multiplies its operand by the value in a register. What register (eax, ebp, esp, etc.) is multiplied by the first operand? And what register is the result stored in, so I can move it to the stack? Sorry, I'm just learning x86 assembly. When I try to compile this line... mull $9 I get, "Error: suffix or operands invalid for 'mul'". Can anyone help me out? Thanks. EDIT: OK Madhur, I replaced "mull" with "mul" and I'm still getting the same error. Here's the whole source. .globl _main _main: pushl %ebp movl %esp, %ebp subl $8, %esp movl $7, %eax mul $9 movl %eax, (%esp) call _putchar xorl %eax, %eax leave ret

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• Receive data in same order as that of NSOperationQueue

  - by Nishit

  Hi, I have an NSOperationQueue, in which I keep on adding NSOperation objects that hit server and brings data. Is there a way to store the received data in the order in which they were fired? For example, suppose the A, B and C objects are added in NSOperationQueue in the order ABC. Now each of the three A, B and C will bring data in their corresponding threads. I want to store the results in the same order in an array so that the contents of array becomes "Result A", "Result B" and "Result C". Please provide a solution or a direction towards the right answer for this problems. Thanks Guys Basically, I want to design an autosuggest component which brings data from server (same as in google app), and I thought NSOperationQueue to be the best method to implement this. Currently I set the maxConcurrentOperationCount to 1, but I want to set it to more than 1, as data comes from the server very slowly. Please point out the right dolution or direction towards this question. Thanks

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• In windbg, how do I get a heap header address from !heap -l results?

  - by Kevin

  I am playing around with windbg's !heap command, particular the "-l" switch which detects memory leaks. When -l does detect a leak, I am having problems navigating from its results to a stack trace for the source of the leak. Here is a snippet of the results from !heap -l 0:066 !heap -l Searching the memory for potential unreachable busy blocks. Entry User Heap Segment Size PrevSize Unused Flags 0324b500 0324b508 01580000 03230000 20 60 a busy 0324b520 0324b528 01580000 03230000 20 20 a busy 0324b5c8 0324b5d0 01580000 03230000 20 28 a busy Windbg's documentation for !heap tells me to use dt _DPH_BLOCK_INFORMATION with the header address, followed by dds with the blocks' StackTrace field. But the output for !heap -l doesn't specify a header address! It's only specififying Entry, User, Heap, and Segment. I've racked my brain looking over the other commands but can't figure out how to get the header address from any of these fields. Can someone help?

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• MessageBox if Recordset Update is Successful

  - by Paolo Bernasconi

  In Access 2007, I have a form to add a new contact to a table: RecSet.AddNew RecSet![Code_Personal] = Me.txtCodePersonal.Value RecSet![FName] = Me.TxtFName.Value RecSet![LName] = Me.txtLName.Value RecSet![Tel Natel] = Me.txtNatTel.Value RecSet![Tel Home] = Me.txtHomeTel.Value RecSet![Email] = Me.txtEmail.Value RecSet.Update This has worked so far, and the contact has successfully been aded. But I'm having two problems: I want to display a messagebox to tell the user the contact was successfully added If the contact was not successfully added because A contact with this name already exists A different issue Then display a message box "Contact already exists" or "error occured" respectively. My idea of doing this is: If recSet.Update = true Then MsgBox "Paolo Bernasconi was successfully added" Else if RecSet![FName] & RecSet![LName] 'already exist in table MsgBox "Contact already exists" Else MsgBox "An unknown error occured" I know this code is wrong, and obviously doesn't work, but it's just to give you an idea of what I'm trying to achieve. Thanks for all your help in advance.

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• Using SQLLite transactions I/O Error

  - by james.ingham

  I currently have a client / server setup where the client sends data to the server and then the server saves the data to a SQLite database file. To do this I am using transactions which works fine in windows 7 when I run around 30 clients (each client sending data back between 5 - 30 seconds). When using the same software in Windows XP, I can get/set data multiple times with no problems until I run around 20 clients I start to get Windows Delayed wrote failed errors: This fires an exception on the server: I'm assuming this is either something to do with XP or a hardware issue on the machine i'm running XP. Does anyone have any advice to avoid this? Or if I should just catch the exception and retry saving the data? Thanks

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• Why doesn't interface inheritance work when writing shell extensions in c#?

  - by Factor Mystic

  According to this article about writing shell extensions in .Net, inheriting the shell interfaces as you might naturally do when writing code doesn't work. I've observed this in my own code as well. Doesn't work: public interface IPersist { // stuff specific only to IPersist } public interface IPersistFolder : IPersist { // stuff specific only to IPersistFolder } Does work: public interface IPersistFolder { // stuff specific to IPersist only // stuff specific to IPersistFolder only } The article notes this fact: Lo and behold, it worked! Notice that I've abandoned any idea that IPersistFolder is inherited from anything at all and just included the stubs from IPersist right in its definition. In all candor, I can't tell you why this is but it definitely works just fine and shouldn't give you any problems. So my I'll ask the question this guy didn't know; why didn't the original code work?

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• WCF host in windows service: cannot get wsdl

  - by michele

  Hi guys! i've a windows service that hosts a WCF service with basicHTTPBinding. In test everything goes right, when i deploy the win service on a Window Server 2003, service hosts correctly wcf, I print out endpoints in tracing, they're correct, but when i ask for wsdl using the address that service exposed (i.e. http://mybaseaddress/?wsdl) i get a dns error, i cannot get the page! Where i fail? I miss something? If i host the wcf with a console app, using the same config file, i can get the wsdl without problems! Thank you in advance Michele

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• Problem with late binding!

  - by benjamin button

  Hi everyone, i was asked this question in an interview. late binding is dynamically identifying the symbol during the runtime as far as my knowledge is concerned.please correct me if i am wrong. i was asked a question like what are some of the problem that we would face when we use late binding in c++. i was actually out of my own ideas about that. could you please share the problems you might have faced during your professional life. thanks.

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• sql db problem with windows authentication

  - by Jimmy

  Have a SQL Server 2008 db which I connect to the Windows Authentication .. has worked good for 7-8 months .. but now when I come to work today it no longer worked to connect, without that I had done something Error message was: Can not open user default database. Login failed. Login failed for user 'Jimmy-PC \ Jimmy'. where the first is the computer name and the second is the user. The problem seems to be that it tries to connect to the default database. Have tried to change it without success .. I do not have sql server management tools for sql 2008 but only to 2005, someone who has similar experience? who have not touched anything said over the weekend and it worked last Friday without any problems.

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• Tools to create maximum velocity in a .NET dev team

  - by Søren Spelling Lund

  If you were to self-fund a software project which tools, frameworks, components would you employ to ensure maximum productivity for the dev team and that the "real" problem is being worked on. What I'm looking for are low friction tools which get the job done with a minimum of fuss. Tools I'd characterize as such are SVN/TortioseSVN, ReSharper, VS itself. I'm looking for frameworks which solve the problems inherient in all software projects like ORM, logging, UI frameworks/components. An example on the UI side would be ASP.NET MVC vs WebForms vs MonoRail.

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• How to convert from K&R C to ANSI C?

  - by Vadakkumpadath

  I am trying to execute following code which is the 1988 entry of Obfuscated C Code Contest. #define _ -F<00||--F-OO--; int F=00,OO=00;main(){F_OO();printf("%1.3f\n",4.*-F/OO/OO);}F_OO() { _-_-_-_ _-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_ _-_-_-_ } From entry description, this code is calculating pi by looking at its own area. I successfully compiled it without changing the code. But when I executed, it is giving me a value 0.25, what I am expecting is 3.14. Code description says it is in K&R C and it doesn't work correctly in ANSI C without some change. I think I have to do those modification to execute it properly. I don't have any previous experience with K&R C. So can someone help me to change above code to ANSI C or point to the problems if any. I am using Microsoft Visual Studio 2008 to execute this.

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• Calling activateWindow on QDialog sends window to background

  - by Stan

  I am debugging certain application written with C++/Qt4. On Linux it has problems that with certain window managers (gnome-wm/metacity), the main window (based on QDialog) is created in the background (it's not raised). I managed to re-create the scenario using PyQt4 and following code: from PyQt4.QtCore import * from PyQt4.QtGui import * import sys class PinDialog(QDialog): def showEvent(self, event): QDialog.showEvent(self, event) self.raise_() self.activateWindow() if __name__ == "__main__": app = QApplication(sys.argv) widget = PinDialog() app.setActiveWindow(widget) widget.exec_() sys.exit(0) If I remove self.activateWindow() the application works as expected. This seems wrong, since documentation for activateWindow does not specify any conditions under which something like this could happen. My question is: Is there any reason to have activateWindow in showEvent in the first place? If there is some reason, what would be good workaround for focusing issues?

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• How to write a linter?

  - by jbdavid

  In my day job I, and others on my team write a lot of hardware models in Verilog-AMS, a language supported primarily by commercial vendors and a few opensource simulator projects. One thing that would make supporting each others code more helpful would be a LINTER that would check our code for common problems and assist with enforcing a shared code formatting style. I of course want to be able to add my own rules and, after I prove their utility to myself, promote them to the rest of the team.. I don't mind doing the work that has to be done, but of course also want to leverage the work of other existing projects. Does having the allowed language syntax in a yacc or bison format give me a leg up? or should I just suck each language statement into a perl string, and use pattern matching to find the things I don't like? (most syntax and compilation errors are easily caught by the commercial tools.. but we have some of our own extentions.)

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• Access Violation Exception only appearing when running C# app without debugger attached

  - by Jon

  I have an application that works fine in Visual Studios 2008, and I am trying to get it into VS 2010 in order to use .NET 4, and I have a really weird problem. When I run the code from either Release mode or Debug mode with the debugger attached (F5), I have no problems running the program. However, when I run the program from either Release or Debug without the debugger attached (Shift+F5), I get an Access Violation Exception when I attempt to run some code in a dll from GDCM. I've created the dlls by using CMake and Swig and following the instructions here adjusting the instructions where necessary to build for VS 2010 and .NET 4. Does any one have any ideas why this is happening and how I can fix it?

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• Is google gson running on android?

  - by Janusz

  I'm playing arround with google gson for communication with my web back end at the moment. This and this older posts indicate that there are some problems with gson on android. I did some easy tests on the device already but maybe I just missed the bug. Edit I'm now parsing a lot more data. Generic lists etc. still not encountered the bug. Has anybody used gson on Android already? How does it work? Has somebody encountered bugs or something that will stop me from using it once it gets more complicated?

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• ASP.NET variable scope

  - by c11ada

  hey all, im really new to ASP.Net and still havnt got my head round most of the concepts, im really having problems with variable, when creating a desktop application, any variable created in code for example int n = 10; this variable will be there until the program is running right. but in asp iv created variables which are supposed to last until the user gets of that page, so for example say i have a page which takes the users value ( call this variable n say the user type in 10) and every time the user presses the next button the code add 10 to this value. so the first time the user presses the next button n= n + 10; what i have found is no matter how many times i press the next button n will always equal 20, because the previous value is not saved !! these values are populated the first time the user enters that page, once the user clicks the next button the content of these values disappear! how can stop this from happening ?? hope this makes sense !! thanks

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• Python-McNuggets problem

  - by challarao

  Hi! I am a student of IIIT.I am new to python.This question is one of the problems in my problem set.Please Help me writing program such as in what I should do it. Show that it is possible to buy exactly 50, 51, 52, 53, 54, and 55 McNuggets, by finding solutions to the Diophantine equation. You can solve this in your head, using paper and pencil, or writing a program. However you chose to solve this problem, list the combinations of 6, 9 and 20 packs of McNuggets you need to buy in order to get each of the exact amounts. Given that it is possible to buy sets of 50, 51, 52, 53, 54 or 55 McNuggets by combinations of 6, 9 and 20 packs, show that it is possible to buy 56, 57,..., 65 McNuggets. In other words, show how, given solutions for 50-55, one can derive solutions for 56-65 6a + 9b + 20c = n

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• Rewriting subdomain to subfolder with htaccess

  - by Owen Allen

  I'm attempting to use .htaccess in the root folder of an Ubuntu/Apache2 server in order to mask a subdomain to subfolder and I keep getting a 500 Internal Error. I know that I'm doing something stupidly wrong and it is some silly error causing the problem. I've checked all of the similar threads on SO and online and whenever I try their advice the 500 continues. Here's my code. RewriteEngine on RewriteCond %{HTTP_HOST} ^admin\.mydomain\.com.*$ RewriteRule (.*) intranet/$1 [L] What I want to occur is that if a user visits admin.mydomain.com they will get the contents of the folder admin.mydomain.com/intranet/ but their URL bar will still be admin.mydomain.com. Any idea what I'm doing wrong? In addition, some of the threads online talked about possible problems with this system. Is this the best way of doing this masking, should I be using a vhost setup?

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• PHP Interview questions

  - by David

  Hi, does anyone have any thoughts on what would be considered good technicaly interviews for new php programmers. Im not meaning the little questions that are intended to know language specific intricacies but more on larger interview questions that potential employees may take an hour or 2 to solve in their own time and then come back with. Specifically im looking at PHP and object orientated but are there any ideas on suitable problems that a php programmer should be able to solve within a couple of hours? I am thinking that I want to have demonstrated object orientated techniques and also unit testing capabilities but as for that it can be anything.

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• Attempt to set foreign key to nonexistent table, sf_guard_user!

  - by Stick it to THE MAN

  I am using SF 1.3.2 with Propel ORM on Ubuntu 9.10. I created a new SF project and simply copied the sfGuard plugin folder from a pre-existing SF 1.32 project. I manually edited the schema.yml in the new project, adding a user table that reference the the sfGuard table. When I run propel:build-sql, I got the task failed, with the error message: Attempt to set foreign key to nonexistent table, sf_guard_user! I'm not sure why this error is occurring, (the error dosent make sense to me, since the sfGuard plugin works fine with the previous project, with no changes made. what am I missing?? BTW, I have not created any apps in the project yet. I am just running the build-sql task first, to make sure that Propel has no problems with parsing my yml files etc.

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• asp.net: deploying local resources - is embedding possible?

  - by chris

  I have an asp.net app with some local resources. These resources are used in the aspx and code-behind files: aspx: <asp:TextBox ID="TextBox1" runat="server" Text="<%$ Resources:testTag %>" /> .vb: TextBox1.Text = GetLocalResourceObject("testTag").ToString If I deploy the .resx files with the app, there are no problems. However, if I change the build action on the resx file to "Embedded Resource", the resources aren't available, even though they're in the DLL that gets built. Is it possible to deploy resources in a DLL, or am I stuck with managing & deploying resx files on the server?

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• Incomplete results with Turkish characters in Indexing Service

  - by Ishmaeel

  Finally I get to post my i's and I's as promised... I've found that MS Indexing Service returns incomplete results when searching for documents with Turkish content. It seems to choke especially regarding the (incorrectly-named) 4I problem. Apparently, MS has fixed this problem with a Windows 2000 http://support.microsoft.com/kb/325333 service pack, but the bug seems to be resurrected with Windows XP & 2003. Anybody uses Indexing Service in their line of work? Similar problems with other non-English locales? Any solutions?

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• What's the best way to do literate programming in Python on Windows?

  - by JasonFruit

  I've been playing with various ways of doing literate programming in Python. I like noweb, but I have two main problems with it: first, it is hard to build on Windows, where I spend about half my development time; and second, it requires me to indent each chunk of code as it will be in the final program --- which I don't necessarily know when I write it. I don't want to use Leo, because I'm very attached to Emacs. Is there a good literate programming tool that: Runs on Windows Allows me to set the indentation of the chunks when they're used, not when they're written Still lets me work in Emacs Thanks! Correction: noweb does allow me to indent later --- I misread the paper I found on it. By default, notangle preserves whitespace and maintains indentation when expanding chunks. It can therefore be used with languages like Miranda and Haskell, in which indentation is significant That leaves me with only the "Runs on Windows" problem.

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• Can't locate in @inc during CPAN dependency install performed not as root.

  - by garrett

  While trying to do: perl -I'/v1/data/site_perl' -MCPAN -e 'install Log::Dispatch'; I continue to get "Can't locate Params/Validate.pm in @INC." When looking at the output, /v1/data/site_perl is NOT in the @INC displayed, even though I used -I. I am not root so I have changed my CPAN config so that: 'makepl_arg' => q[LIB=/v1/data/site_perl INSTALLSITEMAN1DIR=/v1/data/site_perl/man/man1 INSTALLSITEMAN3DIR=/v1/data/site_perl/man/man3 INSTALLMAN1DIR=/v1/data/site_perl/man/man1 INSTALLMAN3DIR=/v1/data/site_perl/man/man3] So even LIB is set. In a basic script I have: use lib '/v1/data/site_perl'; use Params::Validate; With no problems. How do I make the Log::Dispatch use lib /v1/data/site_perl without a force install? What am I missing?

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• Database security / scaling question

  - by orokusaki

  Typically I use a database such as MySQL or PostGreSQL on the same machine as the application using it, which makes access easy and secure. I'm just now building the first site that will have a separate physical database server (later this year it will). I'm wondering 3 things: (security) What things should I look into for starters pertaining to security of accessing a separate machine's database? (scalability) Are their scalability issues that I should think about pertaining to this (technology agnostic)? (more ServerFaultish but related) If starting the DB out on the same physical server (using a separate VMWare VM) and later moving to a different physical server, are there implicit problems that I'll have to deal with? Isn't another VM still accessed via localhost? If these questions are completely ludicrous, I apologize to you DB experts.

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