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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
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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!
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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.
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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
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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
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I think you need to download Crypto++ from here[^]. It contains the missing files
Graham
Librarians rule, Ook!
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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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OK, and I see that you have also got previous version of the Crypto++ library as well. It may be that the example is using an earlier version of Crypto++ (the Sourceforge download pahe[^] has earlier versions.
Other than posting a question to the author on the project page (or asking him if he has an update) I'm afraid that I cannot think what else to suggest. You may just have to try to update the aestest program to the latest version of Crypto++ yourself
Graham
Librarians rule, Ook!
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P.S. This page[^] may help. Jeffrey Walton is active on CP so hopefully he would reply to your question
Graham
Librarians rule, Ook!
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Thanks, but I have already gone through that page on the way to Crypto.
Raymond
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HI Masters!
I'm writing a program that shows a short video clip to user in a seperate window than the main one. but they make TWO button on taskbar, while I don't like so. I'm using pure Win32 API ...
Thnx!
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How about creating the second window as a child of the first one by specifying the WS_CHILD style!!!
« Superman »
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From MSDN:
Managing Taskbar Buttons
The Shell creates a button on the taskbar whenever an application creates a window that isn't owned. To ensure that the window button is placed on the taskbar, create an unowned window with the WS_EX_APPWINDOW extended style. To prevent the window button from being placed on the taskbar, create the unowned window with the WS_EX_TOOLWINDOW extended style. As an alternative, you can create a hidden window and make this hidden window the owner of your visible window
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I am writing an application that communicates with an external device. I need to copy a CString (TCHAR*) to a multibyte string buffer (char*) - the catch is I need the code to be able to compile with UNICODE on or off. Basically I need a function that can copy either a WCHAR* or char* to a char*.
Currently I have:
CString szVal = _T("Some User Input String");
char* Buf;
size_t BufLen;
#ifdef UNICODE
wcstombs_s(&szBufLen, NULL, NULL, szVal, _TRUNCATE);
szBuf = new char[szBufLen];
wcstombs_s(&szBufLen, szBuf, szBufLen, szVal, _TRUNCATE);
#else
szBuf = new char[szVal.GetLength() + 1];
strcpy(szBuf, szVal);
#endif
delete [] szBuf;
The above works, but I would prefer not having to use the preprocessor directives if posssible.
The function _tcscpy will not convert from WCHAR to char when needed. I know I can easily write my own overloaded function, but I was hoping there was already a function defined.
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x87Bliss wrote: but I was hoping there was already a function defined.
Well while you were hoping, I was searching.[^] 
led mike
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Thanks. Sorry, I apparently am not good at searching; I could only find the functions for WCHAR and char, not TCHAR. Those macros are perfect.
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Hi Masters!
I've got to use a dialog box WITHOUT titlebar as the main window in my app. Also the application has NOT any icon into it (don't ask me WHY!).
Now when it runs, its button on the taskbar has no text as a title and no icon on it (It's realy ugly now!).
Can any one help me PLS? ...
modified on Tuesday, June 10, 2008 2:24 PM
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Hi...
Rather than using WITHOUT titlebar, just try to set BorderStyle = NULL.
It will show icon & title in taskbar...
Good Luck...![Rose | [Rose]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/rose.gif)
Jagdish Bhimbha
S/W Engineer
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How can I hook the message when file create or delete??
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Do you mean: FindFirstChangeNotification, FindNextChangeNotification, FindCloseChangeNotification?
Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke
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almost like that
but it's no real-time,right?
I wanna program a dll
it's a real time Hook to watch if there is file 'create' or 'delete'
if there is...then I'll do...
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It's as real time as anything above the driver level. ReadDirectoryChangesW() provides similar functionality, but unless used with overlapped IO, it's a blocking call that can't be easily interrupted.
Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke
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Have a look at ReadDirectoryChangesW().
Regards,
Jijo.
_____________________________________________________
http://weseetips.com[ ^] Visual C++ tips and tricks. Updated daily.
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