How to determine the "(default)" value of a key

I want to know how can I get the default value of a registry key using C++. I already tried sending NULL or an empty string in the key param in RegQueryValueEx() function.

Tried to check anothe开发者_高级运维r key and I get it right. I just can't get the default. The function returns "" instead of the value.

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What do you mean by "key param?" You should be passing NULL or "" as the lpValueName parameter. If that's not working for you then it's a bug in your code. Post your code and perhaps we can provide further assistance.