C / C++ / MFC

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// here's the maximum length of our text buffer<br />
#define TEXTLENGTH 120<br />
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// that's the text buffer itself<br />
char text[TEXTLENGTH]; <br />
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// here's a variable used both to tell QueryValue about the<br />
// buffer's length and to get QueryValue's length answer<br />
DWORD textlength;<br />
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// the registry key object<br />
CRegKey reg;<br />
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// stuff omitted<br />
(... snip ...)<br />
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// initialize with maximum length of text buffer<br />
textlength = TEXTLENGTH;<br />
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// query the registry key<br />
reg.QueryValue(text, "ProductName", &textlength);<br />
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// now textlength is changed, it contains the actual length<br />
// of the text retrieved from the registry.<br />

TCHAR text[1024]; //May be any length suitable for the value 
//unsigned long* buffer;
DWORD buffer = 1024;
unsigned long PerServer;
unsigned long Per1_0Server;
CRegKey reg;

reg.Open(HKEY_LOCAL_MACHINE,_T("Software\\Microsoft\\Windows\\CurrentVersion"));
reg.QueryValue(text,_T("ProductName"),&buffer);