C / C++ / MFC Discussion Boards

Re: How can get total days of Month?

Naveen10-Jun-08 21:17

Naveen

10-Jun-08 21:17

Hamid. wrote:
does your problem solve

That Delete file problem??nop. I failed to find a working solution.

Any way I updated my article. I have metioned the problem and have asked to tell me if any one finds some other solutions. Smile | :)

nave

[OpenedFileFinder]

Re: How can get total days of Month?

Naveen10-Jun-08 19:54

Naveen

10-Jun-08 19:54

2 down votes Dead | X|

. Seems some body doesn't like the idea.

nave

[OpenedFileFinder]

Re: How can get total days of Month?

Hamid_RT10-Jun-08 20:01

Hamid_RT

10-Jun-08 20:01

Now see it again, its 3.3(dont forget our gold members Laugh | :laugh:

Re: How can get total days of Month?

Naveen10-Jun-08 20:10

Naveen

10-Jun-08 20:10

Hamid. wrote:
Now see it again, its 3.3

Thanks Buddy.. Rose | [Rose]

nave

[OpenedFileFinder]

Re: How can get total days of Month?

BadKarma10-Jun-08 20:22

BadKarma

10-Jun-08 20:22

Its 3.5 now Wink | ;)

Learn from the mistakes of others, you may not live long enough to make them all yourself.

Re: How can get total days of Month?

Naveen10-Jun-08 20:28

Naveen

10-Jun-08 20:28

Thanks BadKarma, So you does some Good-Karma's also, haaaa? Smile | :)

nave

[OpenedFileFinder]

Re: How can get total days of Month?

BadKarma10-Jun-08 20:36

BadKarma

10-Jun-08 20:36

Yeah,
thats the Dark Side of me Blush | :O

Learn from the mistakes of others, you may not live long enough to make them all yourself.

Re: How can get total days of Month?

CPallini10-Jun-08 21:57

CPallini

10-Jun-08 21:57

Should I repeat myself?

int daysOfMonth(int month, int year)
{
  switch( month )
  {
    case 4:
    case 6:
    case 9:
    case 11:
    return 30;
    case 2:
    return  year % 400 ? year % 100 ? year % 4 ? 28 : 29 : 28 : 29;
    default:
    return 31;
  }
} 

 :-D

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

Re: How can get total days of Month?

Hamid_RT11-Jun-08 1:13

Hamid_RT

11-Jun-08 1:13

Other code of your magic site,right? Big Grin | :-D

Right!

CPallini11-Jun-08 1:32

CPallini

11-Jun-08 1:32

Re: How can get total days of Month?

Rajesh R Subramanian12-Jun-08 0:35

Rajesh R Subramanian

12-Jun-08 0:35

There is an unjustified low-vote here[^]. I wish you were there. Frown | :(

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.
Codeproject.com: Visual C++ MVP

Re: How can get total days of Month?

CPallini12-Jun-08 0:49

CPallini

12-Jun-08 0:49

Done, wily old fox.
Now could you down vote a unjustified criticism here [^]
Laugh | :laugh:

Re: How can get total days of Month?

Rajesh R Subramanian12-Jun-08 1:02

Rajesh R Subramanian

12-Jun-08 1:02

You're such a badass. Laugh | :laugh:

Thanks for the vote BTW. Smile | :)

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.
Codeproject.com: Visual C++ MVP

Re: How can get total days of Month?

Rajesh R Subramanian12-Jun-08 0:47

Rajesh R Subramanian

12-Jun-08 0:47

You know? I've been showing what you did (this leap year thing) to my Team Lead and we both were laughing out loud in the office. He said "this guy is a good programmer and has an excellent sense of humor too", for which I said "I know". Smile | :)

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.
Codeproject.com: Visual C++ MVP

Re: How can get total days of Month?

CPallini12-Jun-08 1:06

CPallini

12-Jun-08 1:06

Oh, thank you Blush | :O

BTW I was really embarassed, clicking firstly the vote button (I just intended to reply).
Smile | :)

Time limited Demo

RaymondM10-Jun-08 10:04

RaymondM

10-Jun-08 10:04

I would like some basic orientation in setting up a time limit in a demo.
I assume that the time of initial installation is stored somewhere. Where should it be stored ?
I am writing in C with Visual Studio 6,7, or 8.
Raymond Mercier

Re: Time limited Demo

David Crow10-Jun-08 10:13

David Crow

10-Jun-08 10:13

RaymondM wrote:
Where should it be stored ?

It can be stored (encrypted) in either the registry or a .ini file.

"Love people and use things, not love things and use people." - Unknown

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: Time limited Demo

RaymondM10-Jun-08 10:52

RaymondM

10-Jun-08 10:52

David,

Sometimes I think along those lines, but I wonder if the user can still 'get at' the data.
I wondered also if the time could be stored in a private file in the server. Then whenever the program is run it would open the path to the server to check that file.
What do commercial programmers do ?
Raymond

Re: Time limited Demo

Graham Shanks10-Jun-08 12:18

Graham Shanks

10-Jun-08 12:18

Key locked applications usually use an encryption algorithm that produces a large key and distributes the bits of the data source (in your case the expiry date) throughout the key. In this way it is impossible for the user to modify the date. Any attempt to modify the key to change the expiry date will invalidate the key completely and lock the application up.

See this article[^] for details on how you may go about adding a product key to your application.

Personally I don't like the "phone home" method of software validation, since I use a laptop and spend a fair bit of time developing disconnected from the internet (not always off a network, but that is a different matter).

Graham

Librarians rule, Ook!

Re: Time limited Demo

Maximilien10-Jun-08 12:28

Maximilien

10-Jun-08 12:28

RaymondM wrote:
I wondered also if the time could be stored in a private file in the server

Your application does not run "without" a server/network ?

RaymondM wrote:
What do commercial programmers do ?

We had (not now) a limited (not save/export and the like) features demo available for download (different than the paid application)

We found that having a timed demo/application is not worth it, either they run it, or they don't; if with a limited feature demo they find that they like it, they will buy it.

IN ANY CASES, if people want your application, they will find a way to get it ANYWAY.

This signature was proudly tested on animals.

Re: Time limited Demo

RaymondM10-Jun-08 22:05

RaymondM

10-Jun-08 22:05

Thanks to all who have taken the trouble to reply, especially for the link to the AES code.
I think now that the 'phone home' method is a bad idea.
I had put out a limited feature demo, but did feel that it would be better to make it time limited. My experience is that either scheme can lead to a sale.
Raymond

Re: Time limited Demo

Graham Shanks10-Jun-08 23:03

Graham Shanks

10-Jun-08 23:03

The following post about registration systems/[^] is well worth a read

Graham

Librarians rule, Ook!

Re: Time limited Demo

RaymondM11-Jun-08 11:07

RaymondM

11-Jun-08 11:07

Graham,

Going back to the aestest samples I see that I need various headers.

#include "cryptlib.h"
#include "aes.h" // AES
#include "modes.h" // CBC_Mode< >
#include "filters.h" // StringSource

These are not given in that CodeProject page, but when I look around I find something under these names in http://www.koders.com/cpp/...

but the headers I find there sre not right for aestest. So where or the correct headers ?

I had more luck in compiling crypto50 etc, but the versions of cryptlib.h in those versions of crypto are clearly not right either for the aestest examples.

Raymond

Re: Time limited Demo

Graham Shanks11-Jun-08 23:31

Graham Shanks

11-Jun-08 23:31

I think you need to download Crypto++ from here[^]. It contains the missing files

Graham

Librarians rule, Ook!

Re: Time limited Demo

RaymondM12-Jun-08 0:02

RaymondM

12-Jun-08 0:02

That is what I did, and was able to compile some of the various crypto programmes, but each one has a different cryptolib.h, and none of them seem to be right for the aestest programmes.
Raymond

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