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Posted on 2000-03-21
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Last Modified: 2010-04-02
First - using Borland 5.2 & OWL
I would like to allow useage of a program for a specified number of (uses , days) unless it's registered.
How could one go about programming this in? I've heard REGISTRY entries work but using OWL am leary about playing around in the registry in case I screw it up..is this in fact a real danger??
Help or suggestions would be appreciated (alos pseu code or snippet if possible).
Txs
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Question by:dooley090698
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Expert Comment

by:KangaRoo
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That is a danger off course...
Registry data is stored in the files system.dat and user.dat in the windows directory. Windows it self maintains backup copies of these files, system.da0 and user.da0
The backup files are updates if windows boots successfully. It may be worthwhile to keep your own backup copies, since not every fault in the registry will cause windows not to boot.

You can, in the event of a screw-up, restore the backups.
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by:dooley090698
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I understand the dangers of the registry and was looking for some way of (even using the registry) to count the number of times (or days).
Could you give me some ideas on how to implement this..
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alexo earned 100 total points
Comment Utility
Create or open a registry key for your program in HKEY_LOCAL_MACHINE\Software\MyCompany\MyProduct using:

    HKEY hKey; // Save it!
    DWORD disposition;
    RegCreateKeyEx(
        HKEY_LOCAL_MACHINE, "Software\\MyCompany\\MyProduct",
        0, NULL, REG_OPTION_NON_VOLATILE, KEY_ALL_ACCESS, NULL,
        &hKey, &disposition);

Create or write a value:

    DWORD counter = 0;
    RegSetValueEx(hKey, "Counter", 0, REG_DWORD, counter, sizeof counter);
 
Read the value:

    DWORD counter = 0;
    DWORD len, type;
    RegQueryValueEx(hKey, "Counter", NULL, &type, (LPBYTE)&counter, &len);

Finally:

   RegCloseKey(hKey);


Now: in your program RegCreateKeyEx() the key, RegQueryValueEx() the counter, increment it and RegSetValueEx() the data.
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by:dooley090698
Comment Utility
Thank you VERY much - that explains a LOT and clears up some of my confusion.
Great to have access to this knowledge base.
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by:dooley090698
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Once again thanks for the help
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by:alexo
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Any time!
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