Simple text output to the clipboard

I have searched for 'clipboard' on this site but everything I have read is a bit complicated for me (still a newbie).

I have a C++ program that outputs text data to the screen (in it's own little window) to which I then manually copy the data, via the clipboard, to several other programs.
Now I realise that I should be able to write the data straight to the clipboard which would speed things up immensely; note that I don't want to read the data from the clipboard via C++.

I would guess that 99.9% of the time, the code to do this is not portable. Therefore, you first need to tell us your OS. We could assume some OS, but the way to do it in that OS might vary greatly between versions (i.e. Windows). So if you were using Windows, the first thing I would do is (obviously) search. You say you've searched this site, but I would search a larger/general search engine, i.e. Google. Something like "c++ windows write clipboard" and I would be quite certain you will come up with something useful.

Anyway, I dont have time to contribute further, but just giving you a little boost, and if nothing else, you tell us your OS which is required.

OS is windows XP.

Searching google as I write this :)

I've been spending most of the day trying to get this and so far I have this

Code:

---

  OpenClipboard(NULL);
  SetClipboardData(CF_TEXT, "Hello World");
  CloseClipboard();

---

after reading the MSDN library it tells me that SetClipboardData doesn't work if I pass a NULL value to OpenClipboard.

What change could I make to this code to make it work? I am still trying to search via google for the answer but I'm stuck at the moment :(

Thanks for that :)