For a project I used C++ Visual Studio 6.0 and I want to have my source code as a program that will be installed by the user as a trial version.
Making an install file from source code (C++) that is a trial version?
You can use Inno Setup to make your installer. http://www.jrsoftware.org/isinfo.php
It does a fantastic job, and it is free.
As far as making your software a trial version, that is something you will have to do from inside your software. There are infinite ways to do this. The simplest is to make a text file that has the installation date or expiration date, which you read at startup. This is obviously very easy to crack.
If you want to get a little more advanced, add a registry entry during the install that is a hash of the install date combined with part of the computer's mac address. You can then check against that value at startup or on a timer.
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