Can TRegistry write REG_NONE values?

Question

I'm trying to work with the OpenWithProgids key of an extension using TRegistry. I don't see that TRegistry can write these values (which require a type of REG_NONE.) I know that I could just use the API RegSetValueEx function to set these, but I'm wondering if I'm missing something in TRegistry that can do it.

Answer 1

It is true that TRegistry has no direct support for REG_NONE values. However, with the protected hack, you can trick it into creating zero-length binary REG_NONE values:

type
  TRegistryHack = class(TRegistry);
....
TRegistryHack(Registry).PutData(ValueName, nil, 0, rdUnknown);

You need to use the protected hack to gain access to PutData which is a protected member. A cleaner approach would be to use a class helper or true class derived from TRegistry, but you get the idea.