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Always avoid to build software with serial checks, it is easy for crackers to hack it!
If you want to code a shareware then I propose that you put some features of the software in #ifdef blocks and undefine them when compiling the shareware. So crackers won't be able to reenable the features.
Don't try it, just do it! 
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I have to disagree with the other two responses. True someone can crack a serial number easially, but your goal should not be to stop the crackers, you will either fail, or incure other costs that are more than the gain. Remember, the crackers wouldn't buy your product anyway, so it isn't a lost sale.
The goal is to keep the honest people honest. It is easy to justify using a product a little more than allowed because you are planning on registering, but never get around to it. These are the people who you want to gently remind to pay.
There never will be a scheme that cannot be cracked. If it is hard enough it becomes an interesting challange and you just get more attention. Hardware checks are annoying at best, they drive some legitimate customers to buy your product, and then get a version from the underground so they don't have to deal with the stupid stuff!
I recomend you read all the articles at:
http://www.dexterity.com/articles/
I found several of them interesting.
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Yes you could have serial number checks or restrictive limitation for the application. However, when a full version is released, it has the potential to be copied, hacked etc.
IMO it is not worth putting a lot of effort into protecting the software. At best a protection system that stops casual copying between friends is all I would go for. As already mensioned, whatever protection you add to software someone will be able to remove it.
If the software is good enough and cheap enough then a percentage of people will register it. If you go for volume and therefore consumer awareness even a small percentage registrants will bring in the money.
Additionally, an insentive to register could be to get another application free, lifetime updates for the application. That sort of thing.
Ant.
I'm hard, yet soft.
I'm coloured, yet clear.
I'm fruity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Williams (Little Britain)
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I just started programming VC++6 with database support and I already have a major problem: I created a SDI application and when I choose only one table from the Access database everything goes well. But I can't handle 2 or more table from the same database.... How do I use 2 or more table and how do I execute queries(SQL) on tables??? 
I really need help as soon as possible...
A small application using a database with 2 or more table and which shows how to execute SQL queries on different tables would be great... I would really appreciate that!
Please help me... 
Croitoriu Andrei
croi2001@yahoo.com
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I would recommand you to use a real database server, Firebird for example.
www.ibphoenix.com
Do you want to program odbc lowlevel? If not, take a look at the database-Classes here in codeproject.
http://www.codeproject.com/database/#ODBC[^]
There are some examples.
Hardy.
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The SQL query generated by ClassWizard should have formed the JOIN clause automatically. In case it didn't, you'll need to do it manually. For example, here is a JOIN on three tables of a database I recently worked on:
SELECT [Meet].[Name], [Meet].[Date], [Gymnast].[Name], [Scores].[Score1]
FROM Meet INNER JOIN (Gymnast INNER JOIN Scores ON [Gymnast].[AutoNumber]=[Scores].[GymnastNum]) ON [Meet].[AutoNumber]=[Scores].[MeetNum]
ORDER BY meet.date; Search MSDN for different examples of LEFT, RIGHT, INNER, FULL, CROSS, and OUTER joins.
"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen
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HI ,
I want to write a program, which Continuesly read from COM port.
but i want to do , as data Come on COM port it reads it , and use accoedingly.
I not want to that it reads in Continuse loop . and remain busy .
i want as in Socket as data recives event fires then we recive it and use it.
is there any event that is fired when data
is come( written) on COM port.
thanx
Regards.
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Yes and no. The COM ports, by default, are continous IO. They don't fire events unless you specify so, and tell them what events they fire. This is called asynchronous communication, or overlapped IO, and is fairly well covered by many articles in the Net.
Here[^] is a link to one, right here on Code Project.
-Antti Keskinen
----------------------------------------------
The definition of impossible is strictly dependant
on what we think is possible.
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I am working with VC++ 6.0 with Windows-DDK installed in the system and correct Directory-path (Include & Library) set. After compilation of any VC++ project from workspace when I start the build-process, I am getting a linker-warning as follows.
[LINK : warning LNK4078: multiple ".rdata" sections found with different attributes (C0000040)]
My project-setting involves "Incremental-Linking" and I am using Debug-build. This is not a project-specific warning. Any simple MFC application is throwing this LNK-warning during build.
If anyone has come across this situation, please let me know how to get rid of this problem...
Koushik Chakrabarti
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if this warning doesn't cause any problems with the software then you can easily ignore it.
Don't try it, just do it!
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I'm having two istream-related problems. Please can somebody help...
Problem 1
void loadStuffFromStream (istream& stream)
{
stream.seekg( length, ios_base::cur );
}
***edited*** This seems to skip to an arbitrary position in the stream, instead of 'current position' + length bytes. Why does it do this?
Problem 2
char ch;
int pos;
...
pos = stream.tellg();
stream.get (ch);
pos = stream.tellg();
stream.get (ch);
pos = stream.tellg();
stream.get (ch);
pos = stream.tellg();
stream.get (ch);
Not so much a 'problem' as a matter of curiosity. Why is there a sudden leap in the read-position reported by tellg the first time I read from the stream? (N.B. It is reading the correct characters into ch!)
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I want to know something about video chat.for example:whici protocal is preferred,which Interface is used to record video data and audio data.
I also want to know whether the data structure used to store the video data and audio data is the same.if not,the procedure of recording video and audio is separately executed.IGraphicBuilder and ICaptureGraphBuilder2 are used to capture video. and Recording audio data is execute by another interfaces?
please help me,thanks a lot
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you question is very very general. what about fetching some information before asking?
there are articles about video capturing on cp!
Don't try it, just do it!
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Could you give me some advices? such as book,URL etc. Thanks a lot
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Hi,
how can i use the Console in vc++ .net?
I've seen an example code at MSDN like:
Console::WriteLine("blabla");
However, I need to reference the "System" namespace i guess...It's easy to do that in VB.NET and C# but how to do that in VC++.NET ?
Thanks
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There's one crucial difference.
VC++ .NET is standard C++, you can write console applications by creating a file that contains the function main and links with the C Runtime Library.
However, Managed Extensions for C++ (MC++) is the C++ version you use to write software for .NET Framework. MC++ is the language that can be compared with C# or VB .NET, for example. VC++ .NET is not a .NET language.
In MC++, you need to use the import statements to use the .NET Framework. For example:
#import <mscorlib.dll>
#import <system.dll>
System::Console::Writeline( L"BlaBla" ); Microsoft is currently developing the C++/CLI specification, which is MUCH more flexible and usable than MC++. To write programs with this language, you need to have the Visual C++ Express 8 Beta version, available from Microsoft as a free download.
-Antti Keskinen
----------------------------------------------
The definition of impossible is strictly dependant
on what we think is possible.
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Thanks a lot 
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hi,
How can we use the thumbnail view in a list ctrl?
bye
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Hello I am only a beginner. I like to ask if how to use visual c++? What are their variables?
Dark Angel
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What do you mean with variables??
Hardy.
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What to use in visual c++? I mean their language and code.
Dark Angel
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Language -- for what?? Programming language - c++, Language for user interface ?? Whatever you like.
Are you a programmer?
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Are you familiar with C or C++ programming?? Do you have any programming experience. If not, then I suggest you to learn C++ language first, before moving to Visual C++.
ARSALAN MALIK
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