During installment user enters his name. I want to access it for later use

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C++

During installment user enters his name. I want to access it for later use
I found a code written in C# which accesses the CustomAction dialog item
I like to get an equivalent code in C++ code
Would you help me?

The code in C# is below

[RunInstaller(true)]
public partial class InstallerHelp : Installer{
    public override void Install(IDictionary stateSaver) {
        base.Install(stateSaver);
        string strKey = Context.Parameters["KeyValue"];
        string sPath = @"c:\Test.txt";
        if (File.Exists(sPath))
            File.Delete(sPath);
        File.WriteAllText(sPath, strKey);
    }
}

Thank you in advance
ChangChiTheGraphics