Expirable Software

[rholguin]

How can I make my vb application expire, like a trial version application?

 

[woyler]

There are endless ways yo accomplish this. The most simplistic would be to store a value in the registry and check it when you start the app and update it when you close it. If you are worried about the user being able to change it, you can store that value in a more difficult to find registry key or make it a calculated value or encrypt it.

 

[rholguin]

Thanks woyler, would you happen to have an example of how to store a value in the registry, check and update that value? a link or online resource would be nice or the code with comments would be great...Thanks again...

 

[johnwm]

Look up SaveSetting and GetSetting in VBHelp
Let me know if this helps
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[CCLINT]

using SaveSetting and GetSetting (and using the registry at all) is an option, but easily changed, unless you use a setting that only you can interpet, or the string is actually encrypted.
The API functions CryptEncrypt and CryptDecrypt will help you with this.
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[teh215]

Look at

http://www.activelock.com

. They have a very good freeware control that does exactly what you are looking for.


Rob

 

[woyler]

Make a reference to Registry Access Functions.
Use the:
UpdateKey and GetKeyValue to get and set your values

GetKeyValue HKEY_LOCAL_MACHINE,REG_KEY "\MyKey", "MyString",MyVariable

MyKey and MyString can be whatever you want to name them.
If you want to go deeper in the Key structure use: \MyKey\MyKeyOne\MyKeyTwo"

MyString is the string value namethat will hold the data.
When using GetKeyValue "Myvariable" will hold the requested value.

When using UpdateKey "Myvariable" will be the value you are updating