PowerWriteFriendlyName is creating some junk characters in vista

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When I try to change/set the name for power plan whose text count is >= 20 in vista, using PowerWriteFriendlyName it is writing, but followed by some junk characters. I want to set the name without junks. Please help me.

Here's the code which I used,

C++

CString szPlanName = _T("abcdefghijabcdefghij"); // Count is exactly 20
PowerWriteFriendlyName(
NULL,
[PowerSchemeGuid], // Any valid guid
NULL,
NULL,
(UCHAR *)szPlanName.GetBuffer(),
szPlanName.GetLength() * 2
);

Note:
This code is working fine in other OS except vista.

Posted 9-Dec-13 2:48am

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Jochen Arndt · Accepted Answer · 2013-12-09T03:36:00

From PowerWriteFriendlyName[^]:

Quote:
BufferSize [in]
The size of the friendly name specified by the Buffer parameter, including the terminating NULL character.

So you must specify two more bytes than the string length. Because the Buffer parameter is a Unicode string, you should also use CStringW:

CStringW szPlanName = L"abcdefghijabcdefghij";
PowerWriteFriendlyName(
    NULL,
    [PowerSchemeGuid], // Any valid guid
    NULL,
    NULL,
    (UCHAR *)szPlanName.GetBuffer(),
    (1 + szPlanName.GetLength()) * sizeof(wchar_t)
);