CODEWITHSUNDEEP
c++registry
jack excell
jack excell

Reputation: 141

Using RegQueryInfoKey

I am new to programming, I would like to know the number of entries in a registry key. I think entries are called subkeys but I am not sure. I am trying to use RegQueryInfoKey() but I don't fully understand the MSDN webpage since I am beginner. 

HKEY hKey = HKEY_LOCAL_MACHINE;
char regpath[] = "SOFTWARE\\MyApplication\\"
LPDWORD numberofEntries;
RegOpenKeyEx(hKey, regpath, 0, KEY_READ, &hKey);
RegQueryInfoKey(hKey, NULL, NULL, NULL, numberofEntries, NULL);

then I would like to printf the number of entries in this key. The code above doesn't work, the app crash.

How is it done? Thank you

Upvotes: 1

Views: 3130

Answers (1)

David Heffernan
David Heffernan

Reputation: 612794

RegQueryInfoKey has 12 parameters. You are only passing 6. I can't understand how that even compiles—perhaps you are providing your own definition of RegQueryInfoKey rather than the one from the windows header files.

Perhaps you are getting confused by the fact that many of the parameters to RegQueryInfoKey are marked as optional. This only means that you can pass NULL into the function and not that you can omit the parameters altogether.

Upvotes: 1

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