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Article #12289

Re: FirstTimeWindowsInstalled.

#12289
From: Remy Lebeau (TeamB)
Date: Sun, 14 Dec 2003 22:06
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"Safari" <Safari@alloymail.com> wrote in message
news:3fdc4d66@newsgroups.borland.com...

> How can i read FirstTimeWindowsInstalled from Registry?

You already know how, because you showed the code for doing that.  So what
is the actual problem?

>    TRegistry *Regis = new TRegistry.Create;

That is not the correct way to instantiate TRegistry (or any other class,
for that matter).  You must have a Delphi background, because you keep
trying to post Delphi code lately in your C++ questions.  The correct way to
instantiate TRegistry in this example should be the following instead:

    TRegistry *Regis = new TRegistry;

>    Regis->RootKey = HKEY_LOCAL_MACHINE;

Which version of BCB are you using?  If BCB 5 or 6, then since you are
trying to access the HKLM key under an NT-based system, you should set the
TRegistry's Access property to KEY_READ because of security restrictions on
the HKLM key:

    Regis->Access = KEY_READ;

Alternatively, you can call OpenKeyReadOnly() instead of OpenKey() to get
the same effect.

>    Regis->OpenKey("\\Software\\Microsoft\\Windows NT\\CurrentVersion",
> false);

OpenKey() (and OpenKeyReadOnly()) has a boolean return value that you should
be testing before you call ReadInteger(), otherwise you are going to get an
exception from trying to read a value from an unopened key:

    if( Regis->OpenKey("\\Software\\Microsoft\\Windows NT\\CurrentVersion",
false) )
        //...


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Subject: Re: FirstTimeWindowsInstalled.
Date: Sun, 14 Dec 2003 14:06:34 -0800
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