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  • C++ Class Static variable problem - C programmer new to C++

    - by Microkernel
    Hi guys, I am a C programmer, but had learnt C++ @school longtime back. Now I am trying to write code in C++ but getting compiler error. Please check and tell me whats wrong with my code. typedef class _filter_session { private: static int session_count; /* Number of sessions count -- Static */ public: _filter_session(); /* Constructor */ ~_filter_session(); /* Destructor */ }FILTER_SESSION; _filter_session::_filter_session(void) { (this->session_count)++; return; } _filter_session::~_filter_session(void) { (this->session_count)--; return; } The error that I am getting is "error LNK2001: unresolved external symbol "private: static int _filter_session::session_count" (?session_count@_filter_session@@0HA)" I am using Visual Studio 2005 by the way. Plz plz help me. Regards, Microkernel

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  • How to learn proper C++?

    - by Chris
    While reading a long series of really, really interesting threads, I've come to a realization: I don't think I really know C++. I know C, I know classes, I know inheritance, I know templates (& the STL) and I know exceptions. Not C++. To clarify, I've been writing "C++" for more than 5 years now. I know C, and I know that C and C++ share a common subset. What I've begun to realize, though, is that more times than not, I wind up treating C++ something vaguely like "C with classes," although I do practice RAII. I've never used Boost, and have only read up on TR1 and C++0x - I haven't used any of these features in practice. I don't use namespaces. I see a list of #defines, and I think - "Gracious, that's horrible! Very un-C++-like," only to go and mindlessly write class wrappers for the sake of it, and I wind up with large numbers (maybe a few per class) of static methods, and for some reason, that just doesn't seem right lately. The professional in me yells "just get the job done," the academic yells "you should write proper C++ when writing C++" and I feel like the point of balance is somewhere in between. I'd like to note that I don't want to program "pure" C++ just for the sake of it. I know several languages. I have a good feel for what "Pythonic" is. I know what clean and clear PHP is. Good C code I can read and write better than English. The issue is that I learned C by example, and picked up C++ as a "series of modifications" to C. And a lot of my early C++ work was creating class wrappers for C libraries. I feel like my own personal C-heavy background while learning C++ has sort of... clouded my acceptance of C++ in it's own right, as it's own language. Do the weathered C++ lags here have any advice for me? Good examples of clean, sharp C++ to learn from? What habits of C does my inner-C++ really need to break from? My goal here is not to go forth and trumpet "good" C++ paradigm from rooftops for the sake of it. C and C++ are two different languages, and I want to start treating them that way. How? Where to start? Thanks in advance! Cheers, -Chris

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  • Binding Properties.Settings to Textbox fails

    - by user268098
    I would like to define a key & value in Settings.settings and bind the value by declaration in the XAML (not in the code behind by command). Here's what I've been trying in vain: Create a WPF project "Exp1" with Visual Studio Express 2010. Set one key named "TextFromSettings" to the value "Some Text from Setting". Add the attribute xmlns:p="clr-namespace:Exp1.Properties;assembly=Exp1" to the tag. Add Text="{Binding Path=TextFromSettings, Mode=TwoWay, Source={x:Static p:Settings.Default}}" to the tag Now, the preview window shows the text, however, the compiler fails: "Error 1 Cannot find the type 'Settings'. Note that type names are case sensitive." Where am I going wrong?

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  • How do you create your own drag-n-drop GUI designer ?

    - by panzerschreck
    Hello I was looking at creating a UI for developing web forms, similar to the Netbeans Visual JSF form designer.It will be targeted to use GWT/GXT components.I am looking at a look very similar to VS/Netbeans. Any thoughts on where/how to start ? Initially, I would prefer to have it as a standalone application, later develop it as eclipse plugin. I have already evaluated the extjs designer and the eclipse plugin from instantiations, but i would prefer to have it developed on my own, as it looks challenging, Also, I have few custom components that have been developed. Thanks

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  • How to run an SQL stored procedure through C# at a specific time?

    - by yishai neeman
    I am building a website now for a library and i need to check every day at the same time if there are people who need to return their books in the next five days and to send them a reminder via email. My question is what will be the correct way to do that? What i need to accomplish is when the specific time of day comes i need to run an sql stored procedure and check either through visual studio 2010 or any other way if the stored procedure has returned any results to which i need to email. Is there a way to maybe check the system time constantly on C# and not as a triggered event?

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  • SendMessage (F4) fails when sending it to window

    - by Olli
    Working with Visual Studio 6 (VC++ 6.0) I'm using an ActiveX datepicker control which I fail to show expanded by default (3006216). Alternatively I'm trying to send a keyboard message (F4) to my window to open up the control, but nothing happens when I do so... // try 1: use the standard window handle LRESULT result = ::SendMessage(m_hWnd,VK_F4, 0, 0); // try 2: use just use the SendMessage result = SendMessage(VK_F4); result is always 0 - what can I do to test/verify the message sending? Thanks in acvance a lot... Olli

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  • Algorithm to distribute objects in a box (like InDesign, Illustrator, Draw!)

    - by Rafael Almeida
    I have a set of rectangles with their corresponding positions and a big rectangle which serves as the 'bounding box' for these rectangles. I would like to know of an algorithm that would 'distribute the free space' evenly among the rectangles. Some of you may be familiar with the Distribute Spacing option in Adobe InDesign and similar layout-oriented apps. That would be what I'm looking for. I did try looking it up, but I'm not familiar with 'graphical' algorithms terminology and trying only terms relating to 'distribute' mainly yields results about Distributed Computing. So, even the names of the algorithms or better terms to look up would be a big help. Finally, the algorithm doesn't need to be rigorously the same as InDesign's one: pretty much any algorithm that 'distributes' objects inside a region will work fine. In fact, since I'm striving for visual appeal mainly, the more suggestions the better. =D

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  • Generate Color Gradient in C#

    - by Ngu Soon Hui
    My question here is similar to the question here, except that I am working with C#. I have two colors, and I have a predefine steps. How to retrieve a list of Colors that are the gradients between the two? This is an approach that I tried, which didn't work: int argbMax = Color.Chocolate.ToArgb(); int argbMin = Color.Blue.ToArgb(); var colorList = new List<Color>(); for(int i=0; i<size; i++) { var colorAverage= argbMin + (int)((argbMax - argbMin) *i/size); colorList.Add(Color.FromArgb(colorAverage)); } If you try the above code, you will find that a gradual increase in argb doesn't correspond to a visual gradual increase in the color. Any idea on this?

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  • PHP script for creating calendar table or jquery complete solution required

    - by finn_meister
    Ok so this is what I want to make: http://i44.tinypic.com/eiwphl.jpg red = booked green = available I have data in mysql in the format of: property_id, booked_from, booked_until . Before I start trying to create the correct loops etc to create and style the table, i thought i best ask if there are already good jquery plugins / php classes create this visual interface and uncluttered enough to allow me to add a select date range method (like Google Analytics)? I'm looking for something to create a basic calendar table on a loop, which i can then style and add jquery features. Though worth asking if there's a complete package that already does what i plan on making?!! (jquery ui's date-picker doesn't look powerful enough / easy enough to modify)

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  • IE7 ignoring margin in a div following an absolute positioned div

    - by 0al0
    I have two divs inside a container, the first one has absolute positioning. In ie7, the second div apparently ignores the top margin. Padding seems to work fine, but for visual reasons I have to use margin. I know the culprit is the absolute positioned div because if i remove it the following div works fine. This is only happening in ie7 (not even in ie6). Help! Edit: I just found a solution which consists of giving the parent div padding-top just for ie7. So I would just like to know why does this happen, and if there is one, a cleaner solution, but I dont need more dirty hacks..

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  • Jquery help for current time indication within a range

    - by Appster
    I'm looking for a simple light-weight jquery plugin that'll help me show something like this in my website: Essentially, this is like a timeline. I know the start and end dates (in that, they don't change) and the position of today's date just gives an indication of how far along I am into a task I took up on Jun 1, 2012. That's all I need it for - a better visual indication of my current status. I've found a lot of jquery timeline plugins but they are too complex for what I'm trying to do. Any ideas or suggestions? Thanks in advance.

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  • Problem with array of elements of a structure type

    - by kobac
    I'm writing an app in Visual Studio C++ and I have problem with assigning values to the elements of the array, which is array of elements of structure type. Compiler is reporting syntax error for the assigning part of the code. Is it possible in anyway to assign elements of array which are of structure type? typedef struct { CString x; double y; } Point; Point p[3]; p[0] = {"first", 10.0}; p[1] = {"second", 20.0}; p[2] = {"third", 30.0};

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  • Lines-of-code counting for many C# solutions

    - by Eric
    I am currently researching a solution for counting lines of code in C#. I pretty much need a combination of the following two tools: http://richnewman.wordpress.com/2007/07/01/c-and-vbnet-line-count-utility/ http://www.locmetrics.com/index.html My problem is that I need to recursively scan a folder containing a lot of visual studio solutions. So can't really use the first tool without any major work on its code, as it's only able to scan a single solution at a time. But I also need to split the results for each solution, preferably even the contained projects. This disqualifies the second tool I found. I also found NDepend which suffers from the same problem. Do you know of any free tools that do what I need? I am unable to find anything suitable.

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  • Deploying .NET components (upgrade the component for only a single client application)

    - by Vytas999
    I use Visual Studio .NET to create a component that will be shared by two client applications. Eventually, I plan to deploy new version of this component. However, not all of the new versions will be compatible with both client applications. When I deploy component and the client applications, I must ensure that I can upgrade the component for a single client application. I must also minimize the need for configuration changes when I deploy new version of the component. What are possible ways to achieve this goal?

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  • What resources will help me understand the fundamentals of Relational Database Design.

    - by Rachel
    This are few of the fundamental database questions which has always given me trouble. I have tried using google and wiki but I somehow I miss out on understanding the functionality rather than terminology. If possible would really appreciate if someone can share more insights on this questions using some visual representative examples. What is a key? A candidate key? A primary key? An alternate key? A foreign key? What is an index and how does it help your database? What are the data types available and when to use which ones?

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  • Is Windows 7 Home Premium edition sufficient for software development?

    - by Lee Englestone
    Is the Windows 7 Home Premium sufficient for software development? Development would be in Visual Studio 2010. I'm on a budget so would rather purchase 'Home Premium' rather than 'Professional' or 'Ultimate'. The Microsoft site says there is next to nothing functionality wise between them that developers would miss. Can anyone confirm or deny? BTW. Does it come with a version of IIS? I realize that this is not a technical question. But it is important to me and I'm sure other developers wonder the same thing. Cheers, -- Lee

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  • NavigateBackward in Vim?

    - by vexe
    So Ctrl-o works only with jumps and has a history, '' gets you back to your last position regardless of how you ended up there (jumping, navigating, etc) but there's no history for it. What I'm looking for is the best of those two worlds, something like Visual studio's NavigateBackward. Ctrl-o is good but a lot of the times it takes me back to positions I wouldn't expect, jumping is not the only way I navigate... Is there a built-in command/way in vim that does this? if not, is there a plugin for it? if not, I have no problem writing a plugin myself, I know how to set/get the caret position, but I looked at the autocmd-events and couldn't find anything that fires when the caret changes position. How would I go about detecting the 'change' of the caret position? Thanks.

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  • Objective C for Windows

    - by Luther Baker
    What would be the best way to write Objective-C on the Windows platform? Cygwin and gcc? Is there a way I can somehow integrate this into Visual Studio? Along those lines - are there any suggestions as to how to link in and use the Windows SDK for something like this. Its a different beast but I know I can write assembly and link in the Windows DLLs giving me accessibility to those calls but I don't know how to do this without googling and getting piecemeal directions. Is anyone aware of a good online or book resource to do or explain these kinds of things?

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  • WPF: DataGrid Custom. ColumnDesign with my own classes

    - by user437899
    Hi, iam looking for a datagrid which contains objects from my class. class user { string name; int ID; ... } i tried AutoGenerateColumns = true. this will add columns (name, ID, ... like the properties of my class) but i want a different design. not all attributes from the object shold be shown and the columnheader shouldn't be generated from the variablenames... if i build a custom. column-design, i cant add my objects / they will not be displayed. is it possible to define my own columns according to my objects/class. i read about databindings, but i have no idea how i can bind objects/classes in WPF. (in Visual Studio i cant choose my class as datacontext)

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  • Customizing UISlider look

    - by tcurdt
    To customize the visual look of a UISlider you can set the thumb and track images. Part of the track images gets stretched to the appropriate with. From the documentation: A stretchable region sits between two end cap regions. The end caps define the portions of the image that remain as is and are not stretched. The stretchable region is a 1-point wide area between the end caps that can be replicated to make the image appear longer. Now the problem I have is that my stretchable region needs to be more than 1-point wide. (It's a pattern) Unfortunately the 1-point width seems to be hard coded in the SDK. Anyone having an idea how to work around this? Or will I have to write my own slider from scratch for this?

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  • Is it possible to access raw iphone audio output?

    - by Peter Hall
    Is it possible access raw PCM data from the iphone audio output? I know I can embed an MP3 and use AudioUnit. But if the user is playing music in the background from their itunes library, is it possible to access that audio data? This is for an app that shows visual effects, which react to the music. From what I can tell, it isn't possible, but that's just from lack of finding any information at all, rather than actual confirmation that it can't be done. If it isn't possible to access the audio stream from the ipod, is it possible to access raw audio output from the Media Player inside an app, or is pretty much not permitted to access raw audio data from the itunes library at all? EDIT: I found this question: iOS - Access output audio from background program, which say I can't access the audio from a background app. But is it possible to get the audio data from the itunes library if I play it inside the app?

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  • Is the F# language reference documentation available in an offline format (PDF, CHM)?

    - by stakx
    I've found several posts on hubFS of people asking if there is, or will be, offline documentation for F#. These posts haven't been answered. So I want to give it a shot and ask the same question here on SO. Where I've looked for offline documentation so far: The April 2010 CTP release of Visual F# (version 2.0) is available for VS 2008, but it doesn't come without an offline help. There's a question on SO about offline documentation for various programming languages, but F# isn't mentioned there at the time of this writing. There is of course Microsoft's F# language reference documentation (available on MSDN), which could be downloaded for offline browsing using e.g. wget. Question: Does anyone know whether any "official" offline documentation is on the way, anytime soon? (And related to this, albeit this probably can't be answered objectively: Would it be reasonable to expect that F# likely won't undergo ECMA or ISO standardization, ie. there likely won't be a standards document describing the language?)

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  • Beginning VSTO development

    - by idazuwaika
    Hi, I'm quite confused with what are the necessary tools for VSTO develpment. Specifically I want to manipulate Excel 2003/2007 documents programmatically. I did quite a lot of VBA before, if you want to relate any answer to that. Few questions I have about VSTO: Can I use Visual Studio 2008 Express Edition C#/C++ for this? Do I need to have .NET framework installed? Does the resulting VSTO program need to have a copy of Office installed in the same system to run? Direct links to the relevant tools/plugins/IDE will be appreciated. Note: I'm totally new to VSTO and .NET but an Office power user. Have experience with COM programming. Thanks.

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  • How to make VB to execute my SQL SP with parameters?

    - by fema
    Hi, I have a database in MS SQL Server 2008, I have Stored Procedures. One of them does an INSERT with parameters. It works in Server Management Studio. Now I'd like to make a button in Visual Basic 2008 that executes this SP. I have made a DataSet, it contains my 3 SP's, I can easily use 2 of them, because they return data, but the one I'm having trouble with doesn't. Could anyone please tell me how to make VB to execute it? (The command should look like this: "EXECUTE SP2 a, b, c, d".) Thanks in advance

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  • Inserting into an Associative array?

    - by RedShft
    I'm playing around with associative arrays right now and I can't seem to figure out how to add additional objects to the array. I tried insert but it doesn't recognize both arguments. Also, if I do this it produces an error: Node[bool] test; Node node; Node[bool] temp = [ false:node ]; test ~= temp; //Error 1 Error: cannot append type Node[bool] to type //Node[bool] C:\Users\CP\Documents\Visual Studio //2010\Projects\D\STDS\NPC.d 256 Does this mean you can't use the append operator on associative arrays ?

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