🚀 go-pugleaf

"Grety" <valid@emailaddress.com> wrote in message
news:42594bd9@newsgroups.borland.com...

> I open the Regedit in Win98 for example
> do the changes and See :-? Nothing happed, but when I
> press F5 (Refresh Button) the changes Apply.
> Now I want to know can I programmically do this job,
> using Refresh()? there is no Refresh Function in MyReg,
> How?

You don't need one.  When you write to the Registry, the values are
available immediately.  What you describe is merely a display issue in the
Registry Editor, not the Registry itself.  If you run the same test on an
NT-based system without making any chanes to your code, you will see the
Editor update the display automatically as expected.

>    TRegistry *MyReg=new TRegistry();
>    MyReg->RootKey=HKEY_CURRENT_USER;
>    MyReg->OpenKey("somewhere",true);
>    MyReg->WriteString("1",Edit1->Text);
> //   MyReg->Refresh
>    delete MyReg;

That code is not error safe.  If OpenKey() fails, WriteString() will throw
an exception, bypassing your 'delete' statement and thus the memory for the
TRegistry object will be leaked.  You should be checking the return value of
OpenKey(), and also wrapping the 'new' and 'delete' statements with an
exception handler, or at least use a std::auto_ptr object.  For example:

    try
    {
        TRegistry *MyReg = new TRegistry;
        try
        {
            MyReg->RootKey = HKEY_CURRENT_USER;
            if( MyReg->OpenKey("somewhere",true) )
            {
                MyReg->WriteString("1",Edit1->Text);
                MyReg->CloseKey();
            }
            else
                // could not open/create the key...
        }
        __finally {
            delete MyReg;
        }
    }
    catch(const Exception &)
    {
        // an error occured...
    }

or:

    #include <memory>

    try
    {
        std::auto_ptr<TRegistry> MyReg(new TRegistry);

        MyReg->RootKey = HKEY_CURRENT_USER;
        if( MyReg->OpenKey("somewhere",true) )
        {
            MyReg->WriteString("1",Edit1->Text);
            MyReg->CloseKey();
        }
        else
            // could not open/create the key...
    }
    catch(const Exception &)
    {
        // an error occured...
    }


Gambit