Modifying 64-bit registries using 32-bit application or vice versa

I've seen answers for this in C#, but the C++ solutions I've used haven't been working for me. I can make the application 64-bit, but then I lose out on modifying the 32-bit registries, so I'd like to modify both registries in a single application.

Right now I've found 32-bit on 64 works more, so I'm going that route - but if it's easier to do 64-bit accessing 32-bit let me know.

I use the following to init: RegistryKey^ key = Registry::LocalMachine;

Then the following to delete a registry value:

        if (key->OpenSubKey(PATH)) {
            key->DeleteSubKeyTree(PATH);
        }

PATH is something like SOFTWARE\\WOW6432Node\\Apple Computer, Inc.\\QuickTime

Now, depending on if the c++ architecture is 32 or 64-bit, I can delete one or the other. Deleting both is the hassle.

Is there something like this for 64-bit:

RegistryKey^ wygRegKey = Microsoft::Win32::Registry::LocalMachine->OpenSubKey("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall");

If anything, I can send cmd commands to delete the registry and then check if it exists for logs, but I'd prefer not to risk missing errors.

Solution

You need to use RegistryKey.OpenBaseKey() to create a RegistryKey object for the desired view (32bit or 64bit) of the Registry.

RegistryKey ^key = RegistryKey::OpenBaseKey(RegistryHive::LocalMachine, RegistryView::Registry32);
// the next call maps to "SOFTWARE\\WOW6432Node\\Apple Computer" on a 64bit system...
if (key->OpenSubKey("SOFTWARE\\Apple Computer, Inc."))
{
    key->DeleteSubKeyTree("QuickTime");
    key->Close();
}

string path = "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall";
RegistryKey^ key;

key = RegistryKey::OpenBaseKey(RegistryHive::LocalMachine, RegistryView::Registry32);
key->DeleteSubKeyTree(path);

key = RegistryKey::OpenBaseKey(RegistryHive::LocalMachine, RegistryView::Registry64);
key->DeleteSubKeyTree(path);