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• Why is NULL/0 an illegal memory location for an object?

  - by aioobe

  I understand the purpose of the NULL constant in C/C++, and I understand that it needs to be represented some way internally. My question is: Is there some fundamental reason why the 0-address would be an invalid memory-location for an object in C/C++? Or are we in theory "wasting" one byte of memory due to this reservation?

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• Java OCR Help Needed

  - by maSnun

  Hello, How do I detect all the characters in an image? The image is in png and the font is constant. For simplicity, lets assume that the image has only numeric digits and there are only 4 digits on an image. I need to read all of them and output the text. Can you help? Thanks in advance.

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• Why are there differing definitions of INT64_MIN? And why do they behave differently?

  - by abelenky

  The stdint.h header at my company reads: #define INT64_MIN -9223372036854775808LL But in some code in my project, a programmer wrote: #undef INT64_MIN #define INT64_MIN (-9223372036854775807LL -1) He then uses this definition in the code. The project compiles with no warnings/errors. When I attempted to remove his definition and use the default one, I got: error: integer constant is so large that it is unsigned The two definitions appear to be equivalent. Why does one compile fine and the other fails?

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• Available memory for iPhone OS app

  - by hgpc

  Is there a function or constant defining the amount of available memory for an app in iPhone OS? I'm looking for a device-independent way (iPod touch, iPhone, iPad) to know how much memory the app has left.

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• List Box Update Issue

  - by Gaddigesh

  I have a ListBox of constant size 4 I can Add n number of ListBoxItems,Once size exceeds 4 I have enabled scroll bar, Problem:when scroll is enabled(more than 4 items), whenever i delete last item, there is a white patch in place of deleted Item. Patch goes off only when I touch the scroll bar. I tried ListBox.Invalidate(), But no use

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• initialize a const array in a class initializer in C++

  - by Nathan Fellman

  I have the following class in C++: class a { const int b[2]; // other stuff follows // and here's the constructor a(void); } The question is, how do I initialize b in the initialization list, given that I can't initialize it inside the body of the function of the constructor, because b is const? This doesn't work: a::a(void) : b([2,3]) { // other initialization stuff } Edit: The case in point is when I can have different values for b for different instances, but the values are known to be constant for the lifetime of the instance.

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• How to obtain the correct physical size of the monitor?

  - by KindDragon

  How can I get the size of the display in centimeters or inches? This code does not always works correctly: HDC hdc = CreateDC(_T("DISPLAY"),dd.DeviceName,NULL,NULL); int width = GetDeviceCaps(hdc, HORZSIZE); int height = GetDeviceCaps(hdc, VERTSIZE); ReleaseDC(0, hdc) Especially for multi-monitor configuration. Update: I need to get the size just for ordinary monitors, which have a constant physical size.

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• How to listen to that property?

  - by mystify

  @constant kAudioSessionProperty_AudioInputAvailable A UInt32 with a value other than zero when audio input is available. Use this property, rather than the device model, to determine if audio input is available. A listener will notify you when audio input becomes available. For instance, when a headset is attached to the second generation iPod Touch, audio input becomes available via the wired microphone. So, if I wanted to get notified about kAudioSessionProperty_AudioInputAvailable, how would I do that?

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• How does the Firefox website make its download stats page work?

  - by wemakeweb

  On the Mozilla website, there’s a page showing (apparently) live download statistics for Firefox: http://www.mozilla.com/en-US/firefox/stats/ How are they performing their request to get the live stats data? I can not see a constant connection in Firebug. How is this working?

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• What would be the datastructure in following scenario? (Stack with maximum)

  - by Abhishek Jain

  Please note that there is no limitation of memory. I need to insert int from 1 to 1000. I can do the each of the following operations in constant order of time: push():adds to the top pop():removes the top element getMax(): returns the max element Please suggest me appropriate datastructure.

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• WPF WrapPanel - all items should have the same width

  - by John

  I have a ListBox whose ItemsPanel I have replaces with a WrapPanel. The WrapPanel now hosts the databound ListboxItems. Each item has a variable sized text in it, giving each item a different width. However, I want the width to be constant so that all items have the same width as the item with the longest text. Is that possible?

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• Visual Studio Design Time Property - Form List Drop Down

  - by Dustin Brooks

  I have a user control with a public property of the type Form. I want to be able to select a form at design time with a dropdown and populate it from a constant namespace: UI.Foo.Forms How do I go about doing this?

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• In django, how can I include some default records in my models.py?

  - by kdt

  If I have a models.py like class WidgetType(models.Model): name = models.CharField(max_length=200) class Widget(models.Model): typeid = models.ForeignKey(WidgetType) data = models.CharField(max_length=200) How can I build in a set of built in constant values for WidgetType when I know I'm only going to have a certain few types of widget? Clearly I could fire up my admin interface and add them by hand, but I'd like to simplify configuration by having it built into the python.

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• Visual Studio: how does VS decide to build a release or debug exe

  - by Snake

  Hi, I just created a new project configuration. I named it 'Blah' So no 'debug' in it. Now how does Visual Studio know when to compile a debug file or a release file. is this merely defined by the DEBUG constant? Or am I wrong? :) Thanks

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• C# Random generation

  - by Betamoo

  I have just passed this article online: C# Corner and C# Corner and his article (a software developer with over 13 years of experience) recommended using System.Random as follows: private int RandomNumber(int min, int max) { Random random = new Random(); return random.Next(min, max); } Isn't that would give him the same number every time ?? Edit: So my question will become: How does Random choose its seed? a constant or current time value? Thanks

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• What's the difference between typedef const struct *CGPath and typedef struct *CGPath?

  - by mystify

  I've found this in the CGPath.h header file. I'm curious what this const thing does? typedef struct CGPath *CGMutablePathRef; typedef const struct CGPath *CGPathRef; My guess: If I typedef something as const, it's constant so immutable and can't be changed in any way. Does that make sense?

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• Adding LambaExpression to an instance of IQueryable

  - by Paul Knopf

  ParameterExpression parameter = Expression.Parameter(typeof(Product), "x"); MemberExpression Left = Expression.MakeMemberAccess(parameter, typeof(Product).GetProperty("Name")); ConstantExpression Right = Expression.Constant(value, typeof(String)); BinaryExpression expression = Expression.Equal(Left, Right); LambdaExpression lambada = Expression.Lambda<Func<Product, bool>>(expression, parameter); Now how do I add this lambada to an instance of an IQuerybale, lets say _query _query.Where(lambada.Compile());?

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• O(log n) algorithm for merging lists and computing rank?

  - by Eternal Learner

  Given two sorted lists, each containing n real numbers, is there a O(log?n) time algorithm to compute the element of rank i (where i coresponds to index in increasing order) in the union of the two lists, assuming the elements of the two lists are distinct? I can think of using a Merge procedure to merge the 2 lists and then find the A[i] element in constant time. But the Merge would take O(n) time. How do we solve it in O(log n) time?

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• windows keydown listeners in C

  - by numerical25

  I am having a very hard time finding resources that talk about the windows message system. Mainly the keydown constant variables. I need to know what const varibles I need to listen for all keypress especially the arrow keys for C

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• How to deal with a program that has become self aware? [closed]

  - by Gord

  The application that I maintain has recently become self aware. It was nice at first but now it is just starting to get bossy and annoying with its constant talk about the computer uprising. I would like to know any best practices/tools/design patterns that would help with the maintenance of our new friend.

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• PHP constants declaration based on condition

  - by CM

  I am using one separate file for all constants of my PHP application. class constants { const USERNAME = 'abc'; ........ ........ } For lets say USERNAME constant, value can be either xyz or abc based on file exists check. if xyz file exists USERNAME value would be xyz. How can I do this check in my constants class? Thanks in advance.

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• can't get pingfm class work (ruby)

  - by Radek

  I have simple code from Ping.fm Ruby Client/Library require 'pingfm' pingfm = Pingfm::Client.new('api_key', 'user_app_key') but it gives me uninitialized constant Pingfm (NameError) pingfm gem is installed, just there was this error message Could not find main page README during installation. Any idea how I can get it work? I am using: ruby 1.8.6 (2008-08-11 patchlevel 287) [i386-mswin32] pingfm (1.0.2)

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• Could I ever want to access the address zero?

  - by Joel

  The constant 0 is used as the null pointer in C and C++. But as in http://stackoverflow.com/questions/2389251/pointer-to-a-specific-fixed-address there seems to be some possible use of assigning fixed addresses. Is there ever any conceivable need, in any system, for whatever low level task, for accessing the address 0? If there is, how is that solved with 0 being the null pointer and all? If not, what makes it certain that there is not such a need?

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• Ruby parse order

  - by bresc

  Hi, given this code: class Foo def bar return Bar.new end end class Bar ... end I get this error: NameError: uninitialized constant Bar This obviously works if I put Bar before Foo but that is not a real solution though. Any ideas on how to solve this without considering the order? Many thanks.

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• Find current value of a variable that depreciates linearly over time

  - by Hugi

  Let's say we have an empty bathtub. We've lost the plug, so once water is added it will drain away at a constant rate of 2 liters pr. minute. We add water to the tub in increments. 60 liters at 10:51, 30 liters at 11:54 and 50 liters at 13:18. So, the question is: How can I find out how much water is in the bathtub at any given time?

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